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linuxdebug/arch/powerpc/kvm/book3s_hv.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
* Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
*
* Authors:
* Paul Mackerras <paulus@au1.ibm.com>
* Alexander Graf <agraf@suse.de>
* Kevin Wolf <mail@kevin-wolf.de>
*
* Description: KVM functions specific to running on Book 3S
* processors in hypervisor mode (specifically POWER7 and later).
*
* This file is derived from arch/powerpc/kvm/book3s.c,
* by Alexander Graf <agraf@suse.de>.
*/
#include <linux/kvm_host.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/sched/signal.h>
#include <linux/sched/stat.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/spinlock.h>
#include <linux/page-flags.h>
#include <linux/srcu.h>
#include <linux/miscdevice.h>
#include <linux/debugfs.h>
#include <linux/gfp.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/hugetlb.h>
#include <linux/kvm_irqfd.h>
#include <linux/irqbypass.h>
#include <linux/module.h>
#include <linux/compiler.h>
#include <linux/of.h>
#include <linux/irqdomain.h>
#include <asm/ftrace.h>
#include <asm/reg.h>
#include <asm/ppc-opcode.h>
#include <asm/asm-prototypes.h>
#include <asm/archrandom.h>
#include <asm/debug.h>
#include <asm/disassemble.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <linux/uaccess.h>
#include <asm/interrupt.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/lppaca.h>
#include <asm/pmc.h>
#include <asm/processor.h>
#include <asm/cputhreads.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <asm/switch_to.h>
#include <asm/smp.h>
#include <asm/dbell.h>
#include <asm/hmi.h>
#include <asm/pnv-pci.h>
#include <asm/mmu.h>
#include <asm/opal.h>
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/hw_breakpoint.h>
#include <asm/kvm_book3s_uvmem.h>
#include <asm/ultravisor.h>
#include <asm/dtl.h>
#include <asm/plpar_wrappers.h>
#include "book3s.h"
#include "book3s_hv.h"
#define CREATE_TRACE_POINTS
#include "trace_hv.h"
/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */
/* Used to indicate that a guest page fault needs to be handled */
#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
/* Used to indicate that a guest passthrough interrupt needs to be handled */
#define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
/* Used as a "null" value for timebase values */
#define TB_NIL (~(u64)0)
static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
static int dynamic_mt_modes = 6;
module_param(dynamic_mt_modes, int, 0644);
MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
static int target_smt_mode;
module_param(target_smt_mode, int, 0644);
MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
static bool one_vm_per_core;
module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)");
#ifdef CONFIG_KVM_XICS
static const struct kernel_param_ops module_param_ops = {
.set = param_set_int,
.get = param_get_int,
};
module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644);
MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644);
MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
#endif
/* If set, guests are allowed to create and control nested guests */
static bool nested = true;
module_param(nested, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)");
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
/*
* RWMR values for POWER8. These control the rate at which PURR
* and SPURR count and should be set according to the number of
* online threads in the vcore being run.
*/
#define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL
#define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL
#define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL
static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = {
RWMR_RPA_P8_1THREAD,
RWMR_RPA_P8_1THREAD,
RWMR_RPA_P8_2THREAD,
RWMR_RPA_P8_3THREAD,
RWMR_RPA_P8_4THREAD,
RWMR_RPA_P8_5THREAD,
RWMR_RPA_P8_6THREAD,
RWMR_RPA_P8_7THREAD,
RWMR_RPA_P8_8THREAD,
};
static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
int *ip)
{
int i = *ip;
struct kvm_vcpu *vcpu;
while (++i < MAX_SMT_THREADS) {
vcpu = READ_ONCE(vc->runnable_threads[i]);
if (vcpu) {
*ip = i;
return vcpu;
}
}
return NULL;
}
/* Used to traverse the list of runnable threads for a given vcore */
#define for_each_runnable_thread(i, vcpu, vc) \
for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
static bool kvmppc_ipi_thread(int cpu)
{
unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
/* If we're a nested hypervisor, fall back to ordinary IPIs for now */
if (kvmhv_on_pseries())
return false;
/* On POWER9 we can use msgsnd to IPI any cpu */
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
msg |= get_hard_smp_processor_id(cpu);
smp_mb();
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
return true;
}
/* On POWER8 for IPIs to threads in the same core, use msgsnd */
if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
preempt_disable();
if (cpu_first_thread_sibling(cpu) ==
cpu_first_thread_sibling(smp_processor_id())) {
msg |= cpu_thread_in_core(cpu);
smp_mb();
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
preempt_enable();
return true;
}
preempt_enable();
}
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
if (cpu >= 0 && cpu < nr_cpu_ids) {
if (paca_ptrs[cpu]->kvm_hstate.xics_phys) {
xics_wake_cpu(cpu);
return true;
}
opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
return true;
}
#endif
return false;
}
static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
{
int cpu;
struct rcuwait *waitp;
/*
* rcuwait_wake_up contains smp_mb() which orders prior stores that
* create pending work vs below loads of cpu fields. The other side
* is the barrier in vcpu run that orders setting the cpu fields vs
* testing for pending work.
*/
waitp = kvm_arch_vcpu_get_wait(vcpu);
if (rcuwait_wake_up(waitp))
++vcpu->stat.generic.halt_wakeup;
cpu = READ_ONCE(vcpu->arch.thread_cpu);
if (cpu >= 0 && kvmppc_ipi_thread(cpu))
return;
/* CPU points to the first thread of the core */
cpu = vcpu->cpu;
if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
smp_send_reschedule(cpu);
}
/*
* We use the vcpu_load/put functions to measure stolen time.
*
* Stolen time is counted as time when either the vcpu is able to
* run as part of a virtual core, but the task running the vcore
* is preempted or sleeping, or when the vcpu needs something done
* in the kernel by the task running the vcpu, but that task is
* preempted or sleeping. Those two things have to be counted
* separately, since one of the vcpu tasks will take on the job
* of running the core, and the other vcpu tasks in the vcore will
* sleep waiting for it to do that, but that sleep shouldn't count
* as stolen time.
*
* Hence we accumulate stolen time when the vcpu can run as part of
* a vcore using vc->stolen_tb, and the stolen time when the vcpu
* needs its task to do other things in the kernel (for example,
* service a page fault) in busy_stolen. We don't accumulate
* stolen time for a vcore when it is inactive, or for a vcpu
* when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
* a misnomer; it means that the vcpu task is not executing in
* the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
* the kernel. We don't have any way of dividing up that time
* between time that the vcpu is genuinely stopped, time that
* the task is actively working on behalf of the vcpu, and time
* that the task is preempted, so we don't count any of it as
* stolen.
*
* Updates to busy_stolen are protected by arch.tbacct_lock;
* updates to vc->stolen_tb are protected by the vcore->stoltb_lock
* lock. The stolen times are measured in units of timebase ticks.
* (Note that the != TB_NIL checks below are purely defensive;
* they should never fail.)
*
* The POWER9 path is simpler, one vcpu per virtual core so the
* former case does not exist. If a vcpu is preempted when it is
* BUSY_IN_HOST and not ceded or otherwise blocked, then accumulate
* the stolen cycles in busy_stolen. RUNNING is not a preemptible
* state in the P9 path.
*/
static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc, u64 tb)
{
unsigned long flags;
WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
spin_lock_irqsave(&vc->stoltb_lock, flags);
vc->preempt_tb = tb;
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
}
static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc, u64 tb)
{
unsigned long flags;
WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
spin_lock_irqsave(&vc->stoltb_lock, flags);
if (vc->preempt_tb != TB_NIL) {
vc->stolen_tb += tb - vc->preempt_tb;
vc->preempt_tb = TB_NIL;
}
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
}
static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long flags;
u64 now;
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (vcpu->arch.busy_preempt != TB_NIL) {
WARN_ON_ONCE(vcpu->arch.state != KVMPPC_VCPU_BUSY_IN_HOST);
vc->stolen_tb += mftb() - vcpu->arch.busy_preempt;
vcpu->arch.busy_preempt = TB_NIL;
}
return;
}
now = mftb();
/*
* We can test vc->runner without taking the vcore lock,
* because only this task ever sets vc->runner to this
* vcpu, and once it is set to this vcpu, only this task
* ever sets it to NULL.
*/
if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
kvmppc_core_end_stolen(vc, now);
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
vcpu->arch.busy_preempt != TB_NIL) {
vcpu->arch.busy_stolen += now - vcpu->arch.busy_preempt;
vcpu->arch.busy_preempt = TB_NIL;
}
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
}
static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long flags;
u64 now;
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
/*
* In the P9 path, RUNNABLE is not preemptible
* (nor takes host interrupts)
*/
WARN_ON_ONCE(vcpu->arch.state == KVMPPC_VCPU_RUNNABLE);
/*
* Account stolen time when preempted while the vcpu task is
* running in the kernel (but not in qemu, which is INACTIVE).
*/
if (task_is_running(current) &&
vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
vcpu->arch.busy_preempt = mftb();
return;
}
now = mftb();
if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
kvmppc_core_start_stolen(vc, now);
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
vcpu->arch.busy_preempt = now;
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
}
static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
{
vcpu->arch.pvr = pvr;
}
/* Dummy value used in computing PCR value below */
#define PCR_ARCH_31 (PCR_ARCH_300 << 1)
static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
{
unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
/* We can (emulate) our own architecture version and anything older */
if (cpu_has_feature(CPU_FTR_ARCH_31))
host_pcr_bit = PCR_ARCH_31;
else if (cpu_has_feature(CPU_FTR_ARCH_300))
host_pcr_bit = PCR_ARCH_300;
else if (cpu_has_feature(CPU_FTR_ARCH_207S))
host_pcr_bit = PCR_ARCH_207;
else if (cpu_has_feature(CPU_FTR_ARCH_206))
host_pcr_bit = PCR_ARCH_206;
else
host_pcr_bit = PCR_ARCH_205;
/* Determine lowest PCR bit needed to run guest in given PVR level */
guest_pcr_bit = host_pcr_bit;
if (arch_compat) {
switch (arch_compat) {
case PVR_ARCH_205:
guest_pcr_bit = PCR_ARCH_205;
break;
case PVR_ARCH_206:
case PVR_ARCH_206p:
guest_pcr_bit = PCR_ARCH_206;
break;
case PVR_ARCH_207:
guest_pcr_bit = PCR_ARCH_207;
break;
case PVR_ARCH_300:
guest_pcr_bit = PCR_ARCH_300;
break;
case PVR_ARCH_31:
guest_pcr_bit = PCR_ARCH_31;
break;
default:
return -EINVAL;
}
}
/* Check requested PCR bits don't exceed our capabilities */
if (guest_pcr_bit > host_pcr_bit)
return -EINVAL;
spin_lock(&vc->lock);
vc->arch_compat = arch_compat;
/*
* Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
* Also set all reserved PCR bits
*/
vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
spin_unlock(&vc->lock);
return 0;
}
static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
{
int r;
pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap);
for (r = 0; r < 16; ++r)
pr_err("r%2d = %.16lx r%d = %.16lx\n",
r, kvmppc_get_gpr(vcpu, r),
r+16, kvmppc_get_gpr(vcpu, r+16));
pr_err("ctr = %.16lx lr = %.16lx\n",
vcpu->arch.regs.ctr, vcpu->arch.regs.link);
pr_err("srr0 = %.16llx srr1 = %.16llx\n",
vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n",
vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr);
pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
pr_err("fault dar = %.16lx dsisr = %.8x\n",
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
for (r = 0; r < vcpu->arch.slb_max; ++r)
pr_err(" ESID = %.16llx VSID = %.16llx\n",
vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
vcpu->arch.last_inst);
}
static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
return kvm_get_vcpu_by_id(kvm, id);
}
static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
vpa->yield_count = cpu_to_be32(1);
}
static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
unsigned long addr, unsigned long len)
{
/* check address is cacheline aligned */
if (addr & (L1_CACHE_BYTES - 1))
return -EINVAL;
spin_lock(&vcpu->arch.vpa_update_lock);
if (v->next_gpa != addr || v->len != len) {
v->next_gpa = addr;
v->len = addr ? len : 0;
v->update_pending = 1;
}
spin_unlock(&vcpu->arch.vpa_update_lock);
return 0;
}
/* Length for a per-processor buffer is passed in at offset 4 in the buffer */
struct reg_vpa {
u32 dummy;
union {
__be16 hword;
__be32 word;
} length;
};
static int vpa_is_registered(struct kvmppc_vpa *vpap)
{
if (vpap->update_pending)
return vpap->next_gpa != 0;
return vpap->pinned_addr != NULL;
}
static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
unsigned long flags,
unsigned long vcpuid, unsigned long vpa)
{
struct kvm *kvm = vcpu->kvm;
unsigned long len, nb;
void *va;
struct kvm_vcpu *tvcpu;
int err;
int subfunc;
struct kvmppc_vpa *vpap;
tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
if (!tvcpu)
return H_PARAMETER;
subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
subfunc == H_VPA_REG_SLB) {
/* Registering new area - address must be cache-line aligned */
if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
return H_PARAMETER;
/* convert logical addr to kernel addr and read length */
va = kvmppc_pin_guest_page(kvm, vpa, &nb);
if (va == NULL)
return H_PARAMETER;
if (subfunc == H_VPA_REG_VPA)
len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
else
len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
kvmppc_unpin_guest_page(kvm, va, vpa, false);
/* Check length */
if (len > nb || len < sizeof(struct reg_vpa))
return H_PARAMETER;
} else {
vpa = 0;
len = 0;
}
err = H_PARAMETER;
vpap = NULL;
spin_lock(&tvcpu->arch.vpa_update_lock);
switch (subfunc) {
case H_VPA_REG_VPA: /* register VPA */
/*
* The size of our lppaca is 1kB because of the way we align
* it for the guest to avoid crossing a 4kB boundary. We only
* use 640 bytes of the structure though, so we should accept
* clients that set a size of 640.
*/
BUILD_BUG_ON(sizeof(struct lppaca) != 640);
if (len < sizeof(struct lppaca))
break;
vpap = &tvcpu->arch.vpa;
err = 0;
break;
case H_VPA_REG_DTL: /* register DTL */
if (len < sizeof(struct dtl_entry))
break;
len -= len % sizeof(struct dtl_entry);
/* Check that they have previously registered a VPA */
err = H_RESOURCE;
if (!vpa_is_registered(&tvcpu->arch.vpa))
break;
vpap = &tvcpu->arch.dtl;
err = 0;
break;
case H_VPA_REG_SLB: /* register SLB shadow buffer */
/* Check that they have previously registered a VPA */
err = H_RESOURCE;
if (!vpa_is_registered(&tvcpu->arch.vpa))
break;
vpap = &tvcpu->arch.slb_shadow;
err = 0;
break;
case H_VPA_DEREG_VPA: /* deregister VPA */
/* Check they don't still have a DTL or SLB buf registered */
err = H_RESOURCE;
if (vpa_is_registered(&tvcpu->arch.dtl) ||
vpa_is_registered(&tvcpu->arch.slb_shadow))
break;
vpap = &tvcpu->arch.vpa;
err = 0;
break;
case H_VPA_DEREG_DTL: /* deregister DTL */
vpap = &tvcpu->arch.dtl;
err = 0;
break;
case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
vpap = &tvcpu->arch.slb_shadow;
err = 0;
break;
}
if (vpap) {
vpap->next_gpa = vpa;
vpap->len = len;
vpap->update_pending = 1;
}
spin_unlock(&tvcpu->arch.vpa_update_lock);
return err;
}
static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
{
struct kvm *kvm = vcpu->kvm;
void *va;
unsigned long nb;
unsigned long gpa;
/*
* We need to pin the page pointed to by vpap->next_gpa,
* but we can't call kvmppc_pin_guest_page under the lock
* as it does get_user_pages() and down_read(). So we
* have to drop the lock, pin the page, then get the lock
* again and check that a new area didn't get registered
* in the meantime.
*/
for (;;) {
gpa = vpap->next_gpa;
spin_unlock(&vcpu->arch.vpa_update_lock);
va = NULL;
nb = 0;
if (gpa)
va = kvmppc_pin_guest_page(kvm, gpa, &nb);
spin_lock(&vcpu->arch.vpa_update_lock);
if (gpa == vpap->next_gpa)
break;
/* sigh... unpin that one and try again */
if (va)
kvmppc_unpin_guest_page(kvm, va, gpa, false);
}
vpap->update_pending = 0;
if (va && nb < vpap->len) {
/*
* If it's now too short, it must be that userspace
* has changed the mappings underlying guest memory,
* so unregister the region.
*/
kvmppc_unpin_guest_page(kvm, va, gpa, false);
va = NULL;
}
if (vpap->pinned_addr)
kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
vpap->dirty);
vpap->gpa = gpa;
vpap->pinned_addr = va;
vpap->dirty = false;
if (va)
vpap->pinned_end = va + vpap->len;
}
static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.vpa.update_pending ||
vcpu->arch.slb_shadow.update_pending ||
vcpu->arch.dtl.update_pending))
return;
spin_lock(&vcpu->arch.vpa_update_lock);
if (vcpu->arch.vpa.update_pending) {
kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
if (vcpu->arch.vpa.pinned_addr)
init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
}
if (vcpu->arch.dtl.update_pending) {
kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
vcpu->arch.dtl_index = 0;
}
if (vcpu->arch.slb_shadow.update_pending)
kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
/*
* Return the accumulated stolen time for the vcore up until `now'.
* The caller should hold the vcore lock.
*/
static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
{
u64 p;
unsigned long flags;
WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
spin_lock_irqsave(&vc->stoltb_lock, flags);
p = vc->stolen_tb;
if (vc->vcore_state != VCORE_INACTIVE &&
vc->preempt_tb != TB_NIL)
p += now - vc->preempt_tb;
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
return p;
}
static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
struct lppaca *vpa,
unsigned int pcpu, u64 now,
unsigned long stolen)
{
struct dtl_entry *dt;
dt = vcpu->arch.dtl_ptr;
if (!dt)
return;
dt->dispatch_reason = 7;
dt->preempt_reason = 0;
dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid);
dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
dt->ready_to_enqueue_time = 0;
dt->waiting_to_ready_time = 0;
dt->timebase = cpu_to_be64(now);
dt->fault_addr = 0;
dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
++dt;
if (dt == vcpu->arch.dtl.pinned_end)
dt = vcpu->arch.dtl.pinned_addr;
vcpu->arch.dtl_ptr = dt;
/* order writing *dt vs. writing vpa->dtl_idx */
smp_wmb();
vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
/* vcpu->arch.dtl.dirty is set by the caller */
}
static void kvmppc_update_vpa_dispatch(struct kvm_vcpu *vcpu,
struct kvmppc_vcore *vc)
{
struct lppaca *vpa;
unsigned long stolen;
unsigned long core_stolen;
u64 now;
unsigned long flags;
vpa = vcpu->arch.vpa.pinned_addr;
if (!vpa)
return;
now = mftb();
core_stolen = vcore_stolen_time(vc, now);
stolen = core_stolen - vcpu->arch.stolen_logged;
vcpu->arch.stolen_logged = core_stolen;
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
stolen += vcpu->arch.busy_stolen;
vcpu->arch.busy_stolen = 0;
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
vpa->enqueue_dispatch_tb = cpu_to_be64(be64_to_cpu(vpa->enqueue_dispatch_tb) + stolen);
__kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now + vc->tb_offset, stolen);
vcpu->arch.vpa.dirty = true;
}
static void kvmppc_update_vpa_dispatch_p9(struct kvm_vcpu *vcpu,
struct kvmppc_vcore *vc,
u64 now)
{
struct lppaca *vpa;
unsigned long stolen;
unsigned long stolen_delta;
vpa = vcpu->arch.vpa.pinned_addr;
if (!vpa)
return;
stolen = vc->stolen_tb;
stolen_delta = stolen - vcpu->arch.stolen_logged;
vcpu->arch.stolen_logged = stolen;
vpa->enqueue_dispatch_tb = cpu_to_be64(stolen);
__kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now, stolen_delta);
vcpu->arch.vpa.dirty = true;
}
/* See if there is a doorbell interrupt pending for a vcpu */
static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
{
int thr;
struct kvmppc_vcore *vc;
if (vcpu->arch.doorbell_request)
return true;
if (cpu_has_feature(CPU_FTR_ARCH_300))
return false;
/*
* Ensure that the read of vcore->dpdes comes after the read
* of vcpu->doorbell_request. This barrier matches the
* smp_wmb() in kvmppc_guest_entry_inject().
*/
smp_rmb();
vc = vcpu->arch.vcore;
thr = vcpu->vcpu_id - vc->first_vcpuid;
return !!(vc->dpdes & (1 << thr));
}
static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
return true;
if ((!vcpu->arch.vcore->arch_compat) &&
cpu_has_feature(CPU_FTR_ARCH_207S))
return true;
return false;
}
static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
unsigned long resource, unsigned long value1,
unsigned long value2)
{
switch (resource) {
case H_SET_MODE_RESOURCE_SET_CIABR:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (value2)
return H_P4;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
/* Guests can't breakpoint the hypervisor */
if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
return H_P3;
vcpu->arch.ciabr = value1;
return H_SUCCESS;
case H_SET_MODE_RESOURCE_SET_DAWR0:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (!ppc_breakpoint_available())
return H_P2;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
if (value2 & DABRX_HYP)
return H_P4;
vcpu->arch.dawr0 = value1;
vcpu->arch.dawrx0 = value2;
return H_SUCCESS;
case H_SET_MODE_RESOURCE_SET_DAWR1:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (!ppc_breakpoint_available())
return H_P2;
if (!cpu_has_feature(CPU_FTR_DAWR1))
return H_P2;
if (!vcpu->kvm->arch.dawr1_enabled)
return H_FUNCTION;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
if (value2 & DABRX_HYP)
return H_P4;
vcpu->arch.dawr1 = value1;
vcpu->arch.dawrx1 = value2;
return H_SUCCESS;
case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
/*
* KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved.
* Keep this in synch with kvmppc_filter_guest_lpcr_hv.
*/
if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) &&
kvmhv_vcpu_is_radix(vcpu) && mflags == 3)
return H_UNSUPPORTED_FLAG_START;
return H_TOO_HARD;
default:
return H_TOO_HARD;
}
}
/* Copy guest memory in place - must reside within a single memslot */
static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from,
unsigned long len)
{
struct kvm_memory_slot *to_memslot = NULL;
struct kvm_memory_slot *from_memslot = NULL;
unsigned long to_addr, from_addr;
int r;
/* Get HPA for from address */
from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT);
if (!from_memslot)
return -EFAULT;
if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages)
<< PAGE_SHIFT))
return -EINVAL;
from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT);
if (kvm_is_error_hva(from_addr))
return -EFAULT;
from_addr |= (from & (PAGE_SIZE - 1));
/* Get HPA for to address */
to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT);
if (!to_memslot)
return -EFAULT;
if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages)
<< PAGE_SHIFT))
return -EINVAL;
to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT);
if (kvm_is_error_hva(to_addr))
return -EFAULT;
to_addr |= (to & (PAGE_SIZE - 1));
/* Perform copy */
r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr,
len);
if (r)
return -EFAULT;
mark_page_dirty(kvm, to >> PAGE_SHIFT);
return 0;
}
static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long dest, unsigned long src)
{
u64 pg_sz = SZ_4K; /* 4K page size */
u64 pg_mask = SZ_4K - 1;
int ret;
/* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */
if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE |
H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED))
return H_PARAMETER;
/* dest (and src if copy_page flag set) must be page aligned */
if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask)))
return H_PARAMETER;
/* zero and/or copy the page as determined by the flags */
if (flags & H_COPY_PAGE) {
ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz);
if (ret < 0)
return H_PARAMETER;
} else if (flags & H_ZERO_PAGE) {
ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz);
if (ret < 0)
return H_PARAMETER;
}
/* We can ignore the remaining flags */
return H_SUCCESS;
}
static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
{
struct kvmppc_vcore *vcore = target->arch.vcore;
/*
* We expect to have been called by the real mode handler
* (kvmppc_rm_h_confer()) which would have directly returned
* H_SUCCESS if the source vcore wasn't idle (e.g. if it may
* have useful work to do and should not confer) so we don't
* recheck that here.
*
* In the case of the P9 single vcpu per vcore case, the real
* mode handler is not called but no other threads are in the
* source vcore.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
spin_lock(&vcore->lock);
if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
vcore->vcore_state != VCORE_INACTIVE &&
vcore->runner)
target = vcore->runner;
spin_unlock(&vcore->lock);
}
return kvm_vcpu_yield_to(target);
}
static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
{
int yield_count = 0;
struct lppaca *lppaca;
spin_lock(&vcpu->arch.vpa_update_lock);
lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
if (lppaca)
yield_count = be32_to_cpu(lppaca->yield_count);
spin_unlock(&vcpu->arch.vpa_update_lock);
return yield_count;
}
/*
* H_RPT_INVALIDATE hcall handler for nested guests.
*
* Handles only nested process-scoped invalidation requests in L0.
*/
static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu)
{
unsigned long type = kvmppc_get_gpr(vcpu, 6);
unsigned long pid, pg_sizes, start, end;
/*
* The partition-scoped invalidations aren't handled here in L0.
*/
if (type & H_RPTI_TYPE_NESTED)
return RESUME_HOST;
pid = kvmppc_get_gpr(vcpu, 4);
pg_sizes = kvmppc_get_gpr(vcpu, 7);
start = kvmppc_get_gpr(vcpu, 8);
end = kvmppc_get_gpr(vcpu, 9);
do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid,
type, pg_sizes, start, end);
kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
return RESUME_GUEST;
}
static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu,
unsigned long id, unsigned long target,
unsigned long type, unsigned long pg_sizes,
unsigned long start, unsigned long end)
{
if (!kvm_is_radix(vcpu->kvm))
return H_UNSUPPORTED;
if (end < start)
return H_P5;
/*
* Partition-scoped invalidation for nested guests.
*/
if (type & H_RPTI_TYPE_NESTED) {
if (!nesting_enabled(vcpu->kvm))
return H_FUNCTION;
/* Support only cores as target */
if (target != H_RPTI_TARGET_CMMU)
return H_P2;
return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes,
start, end);
}
/*
* Process-scoped invalidation for L1 guests.
*/
do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid,
type, pg_sizes, start, end);
return H_SUCCESS;
}
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
unsigned long req = kvmppc_get_gpr(vcpu, 3);
unsigned long target, ret = H_SUCCESS;
int yield_count;
struct kvm_vcpu *tvcpu;
int idx, rc;
if (req <= MAX_HCALL_OPCODE &&
!test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
return RESUME_HOST;
switch (req) {
case H_REMOVE:
ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_ENTER:
ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_READ:
ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_CLEAR_MOD:
ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_CLEAR_REF:
ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_PROTECT:
ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_BULK_REMOVE:
ret = kvmppc_h_bulk_remove(vcpu);
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_CEDE:
break;
case H_PROD:
target = kvmppc_get_gpr(vcpu, 4);
tvcpu = kvmppc_find_vcpu(kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
tvcpu->arch.prodded = 1;
smp_mb(); /* This orders prodded store vs ceded load */
if (tvcpu->arch.ceded)
kvmppc_fast_vcpu_kick_hv(tvcpu);
break;
case H_CONFER:
target = kvmppc_get_gpr(vcpu, 4);
if (target == -1)
break;
tvcpu = kvmppc_find_vcpu(kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
yield_count = kvmppc_get_gpr(vcpu, 5);
if (kvmppc_get_yield_count(tvcpu) != yield_count)
break;
kvm_arch_vcpu_yield_to(tvcpu);
break;
case H_REGISTER_VPA:
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
case H_RTAS:
if (list_empty(&kvm->arch.rtas_tokens))
return RESUME_HOST;
idx = srcu_read_lock(&kvm->srcu);
rc = kvmppc_rtas_hcall(vcpu);
srcu_read_unlock(&kvm->srcu, idx);
if (rc == -ENOENT)
return RESUME_HOST;
else if (rc == 0)
break;
/* Send the error out to userspace via KVM_RUN */
return rc;
case H_LOGICAL_CI_LOAD:
ret = kvmppc_h_logical_ci_load(vcpu);
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_LOGICAL_CI_STORE:
ret = kvmppc_h_logical_ci_store(vcpu);
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_SET_MODE:
ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_XIRR:
case H_CPPR:
case H_EOI:
case H_IPI:
case H_IPOLL:
case H_XIRR_X:
if (kvmppc_xics_enabled(vcpu)) {
if (xics_on_xive()) {
ret = H_NOT_AVAILABLE;
return RESUME_GUEST;
}
ret = kvmppc_xics_hcall(vcpu, req);
break;
}
return RESUME_HOST;
case H_SET_DABR:
ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4));
break;
case H_SET_XDABR:
ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
break;
#ifdef CONFIG_SPAPR_TCE_IOMMU
case H_GET_TCE:
ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_PUT_TCE:
ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_PUT_TCE_INDIRECT:
ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_STUFF_TCE:
ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
#endif
case H_RANDOM:
if (!arch_get_random_seed_longs(&vcpu->arch.regs.gpr[4], 1))
ret = H_HARDWARE;
break;
case H_RPT_INVALIDATE:
ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7),
kvmppc_get_gpr(vcpu, 8),
kvmppc_get_gpr(vcpu, 9));
break;
case H_SET_PARTITION_TABLE:
ret = H_FUNCTION;
if (nesting_enabled(kvm))
ret = kvmhv_set_partition_table(vcpu);
break;
case H_ENTER_NESTED:
ret = H_FUNCTION;
if (!nesting_enabled(kvm))
break;
ret = kvmhv_enter_nested_guest(vcpu);
if (ret == H_INTERRUPT) {
kvmppc_set_gpr(vcpu, 3, 0);
vcpu->arch.hcall_needed = 0;
return -EINTR;
} else if (ret == H_TOO_HARD) {
kvmppc_set_gpr(vcpu, 3, 0);
vcpu->arch.hcall_needed = 0;
return RESUME_HOST;
}
break;
case H_TLB_INVALIDATE:
ret = H_FUNCTION;
if (nesting_enabled(kvm))
ret = kvmhv_do_nested_tlbie(vcpu);
break;
case H_COPY_TOFROM_GUEST:
ret = H_FUNCTION;
if (nesting_enabled(kvm))
ret = kvmhv_copy_tofrom_guest_nested(vcpu);
break;
case H_PAGE_INIT:
ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
case H_SVM_PAGE_IN:
ret = H_UNSUPPORTED;
if (kvmppc_get_srr1(vcpu) & MSR_S)
ret = kvmppc_h_svm_page_in(kvm,
kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
case H_SVM_PAGE_OUT:
ret = H_UNSUPPORTED;
if (kvmppc_get_srr1(vcpu) & MSR_S)
ret = kvmppc_h_svm_page_out(kvm,
kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
case H_SVM_INIT_START:
ret = H_UNSUPPORTED;
if (kvmppc_get_srr1(vcpu) & MSR_S)
ret = kvmppc_h_svm_init_start(kvm);
break;
case H_SVM_INIT_DONE:
ret = H_UNSUPPORTED;
if (kvmppc_get_srr1(vcpu) & MSR_S)
ret = kvmppc_h_svm_init_done(kvm);
break;
case H_SVM_INIT_ABORT:
/*
* Even if that call is made by the Ultravisor, the SSR1 value
* is the guest context one, with the secure bit clear as it has
* not yet been secured. So we can't check it here.
* Instead the kvm->arch.secure_guest flag is checked inside
* kvmppc_h_svm_init_abort().
*/
ret = kvmppc_h_svm_init_abort(kvm);
break;
default:
return RESUME_HOST;
}
WARN_ON_ONCE(ret == H_TOO_HARD);
kvmppc_set_gpr(vcpu, 3, ret);
vcpu->arch.hcall_needed = 0;
return RESUME_GUEST;
}
/*
* Handle H_CEDE in the P9 path where we don't call the real-mode hcall
* handlers in book3s_hv_rmhandlers.S.
*
* This has to be done early, not in kvmppc_pseries_do_hcall(), so
* that the cede logic in kvmppc_run_single_vcpu() works properly.
*/
static void kvmppc_cede(struct kvm_vcpu *vcpu)
{
vcpu->arch.shregs.msr |= MSR_EE;
vcpu->arch.ceded = 1;
smp_mb();
if (vcpu->arch.prodded) {
vcpu->arch.prodded = 0;
smp_mb();
vcpu->arch.ceded = 0;
}
}
static int kvmppc_hcall_impl_hv(unsigned long cmd)
{
switch (cmd) {
case H_CEDE:
case H_PROD:
case H_CONFER:
case H_REGISTER_VPA:
case H_SET_MODE:
#ifdef CONFIG_SPAPR_TCE_IOMMU
case H_GET_TCE:
case H_PUT_TCE:
case H_PUT_TCE_INDIRECT:
case H_STUFF_TCE:
#endif
case H_LOGICAL_CI_LOAD:
case H_LOGICAL_CI_STORE:
#ifdef CONFIG_KVM_XICS
case H_XIRR:
case H_CPPR:
case H_EOI:
case H_IPI:
case H_IPOLL:
case H_XIRR_X:
#endif
case H_PAGE_INIT:
case H_RPT_INVALIDATE:
return 1;
}
/* See if it's in the real-mode table */
return kvmppc_hcall_impl_hv_realmode(cmd);
}
static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu)
{
u32 last_inst;
if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
EMULATE_DONE) {
/*
* Fetch failed, so return to guest and
* try executing it again.
*/
return RESUME_GUEST;
}
if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
vcpu->run->exit_reason = KVM_EXIT_DEBUG;
vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu);
return RESUME_HOST;
} else {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
return RESUME_GUEST;
}
}
static void do_nothing(void *x)
{
}
static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu)
{
int thr, cpu, pcpu, nthreads;
struct kvm_vcpu *v;
unsigned long dpdes;
nthreads = vcpu->kvm->arch.emul_smt_mode;
dpdes = 0;
cpu = vcpu->vcpu_id & ~(nthreads - 1);
for (thr = 0; thr < nthreads; ++thr, ++cpu) {
v = kvmppc_find_vcpu(vcpu->kvm, cpu);
if (!v)
continue;
/*
* If the vcpu is currently running on a physical cpu thread,
* interrupt it in order to pull it out of the guest briefly,
* which will update its vcore->dpdes value.
*/
pcpu = READ_ONCE(v->cpu);
if (pcpu >= 0)
smp_call_function_single(pcpu, do_nothing, NULL, 1);
if (kvmppc_doorbell_pending(v))
dpdes |= 1 << thr;
}
return dpdes;
}
/*
* On POWER9, emulate doorbell-related instructions in order to
* give the guest the illusion of running on a multi-threaded core.
* The instructions emulated are msgsndp, msgclrp, mfspr TIR,
* and mfspr DPDES.
*/
static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
{
u32 inst, rb, thr;
unsigned long arg;
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu *tvcpu;
if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE)
return RESUME_GUEST;
if (get_op(inst) != 31)
return EMULATE_FAIL;
rb = get_rb(inst);
thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1);
switch (get_xop(inst)) {
case OP_31_XOP_MSGSNDP:
arg = kvmppc_get_gpr(vcpu, rb);
if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER)
break;
arg &= 0x7f;
if (arg >= kvm->arch.emul_smt_mode)
break;
tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg);
if (!tvcpu)
break;
if (!tvcpu->arch.doorbell_request) {
tvcpu->arch.doorbell_request = 1;
kvmppc_fast_vcpu_kick_hv(tvcpu);
}
break;
case OP_31_XOP_MSGCLRP:
arg = kvmppc_get_gpr(vcpu, rb);
if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER)
break;
vcpu->arch.vcore->dpdes = 0;
vcpu->arch.doorbell_request = 0;
break;
case OP_31_XOP_MFSPR:
switch (get_sprn(inst)) {
case SPRN_TIR:
arg = thr;
break;
case SPRN_DPDES:
arg = kvmppc_read_dpdes(vcpu);
break;
default:
return EMULATE_FAIL;
}
kvmppc_set_gpr(vcpu, get_rt(inst), arg);
break;
default:
return EMULATE_FAIL;
}
kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
return RESUME_GUEST;
}
/*
* If the lppaca had pmcregs_in_use clear when we exited the guest, then
* HFSCR_PM is cleared for next entry. If the guest then tries to access
* the PMU SPRs, we get this facility unavailable interrupt. Putting HFSCR_PM
* back in the guest HFSCR will cause the next entry to load the PMU SPRs and
* allow the guest access to continue.
*/
static int kvmppc_pmu_unavailable(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.hfscr_permitted & HFSCR_PM))
return EMULATE_FAIL;
vcpu->arch.hfscr |= HFSCR_PM;
return RESUME_GUEST;
}
static int kvmppc_ebb_unavailable(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.hfscr_permitted & HFSCR_EBB))
return EMULATE_FAIL;
vcpu->arch.hfscr |= HFSCR_EBB;
return RESUME_GUEST;
}
static int kvmppc_tm_unavailable(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.hfscr_permitted & HFSCR_TM))
return EMULATE_FAIL;
vcpu->arch.hfscr |= HFSCR_TM;
return RESUME_GUEST;
}
static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu,
struct task_struct *tsk)
{
struct kvm_run *run = vcpu->run;
int r = RESUME_HOST;
vcpu->stat.sum_exits++;
/*
* This can happen if an interrupt occurs in the last stages
* of guest entry or the first stages of guest exit (i.e. after
* setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
* and before setting it to KVM_GUEST_MODE_HOST_HV).
* That can happen due to a bug, or due to a machine check
* occurring at just the wrong time.
*/
if (vcpu->arch.shregs.msr & MSR_HV) {
printk(KERN_EMERG "KVM trap in HV mode!\n");
printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
kvmppc_dump_regs(vcpu);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
run->hw.hardware_exit_reason = vcpu->arch.trap;
return RESUME_HOST;
}
run->exit_reason = KVM_EXIT_UNKNOWN;
run->ready_for_interrupt_injection = 1;
switch (vcpu->arch.trap) {
/* We're good on these - the host merely wanted to get our attention */
case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER:
WARN_ON_ONCE(1); /* Should never happen */
vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER;
fallthrough;
case BOOK3S_INTERRUPT_HV_DECREMENTER:
vcpu->stat.dec_exits++;
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_EXTERNAL:
case BOOK3S_INTERRUPT_H_DOORBELL:
case BOOK3S_INTERRUPT_H_VIRT:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
/* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
case BOOK3S_INTERRUPT_HMI:
case BOOK3S_INTERRUPT_PERFMON:
case BOOK3S_INTERRUPT_SYSTEM_RESET:
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_MACHINE_CHECK: {
static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
/*
* Print the MCE event to host console. Ratelimit so the guest
* can't flood the host log.
*/
if (__ratelimit(&rs))
machine_check_print_event_info(&vcpu->arch.mce_evt,false, true);
/*
* If the guest can do FWNMI, exit to userspace so it can
* deliver a FWNMI to the guest.
* Otherwise we synthesize a machine check for the guest
* so that it knows that the machine check occurred.
*/
if (!vcpu->kvm->arch.fwnmi_enabled) {
ulong flags = vcpu->arch.shregs.msr & 0x083c0000;
kvmppc_core_queue_machine_check(vcpu, flags);
r = RESUME_GUEST;
break;
}
/* Exit to guest with KVM_EXIT_NMI as exit reason */
run->exit_reason = KVM_EXIT_NMI;
run->hw.hardware_exit_reason = vcpu->arch.trap;
/* Clear out the old NMI status from run->flags */
run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK;
/* Now set the NMI status */
if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED)
run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV;
else
run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV;
r = RESUME_HOST;
break;
}
case BOOK3S_INTERRUPT_PROGRAM:
{
ulong flags;
/*
* Normally program interrupts are delivered directly
* to the guest by the hardware, but we can get here
* as a result of a hypervisor emulation interrupt
* (e40) getting turned into a 700 by BML RTAS.
*/
flags = vcpu->arch.shregs.msr & 0x1f0000ull;
kvmppc_core_queue_program(vcpu, flags);
r = RESUME_GUEST;
break;
}
case BOOK3S_INTERRUPT_SYSCALL:
{
int i;
if (unlikely(vcpu->arch.shregs.msr & MSR_PR)) {
/*
* Guest userspace executed sc 1. This can only be
* reached by the P9 path because the old path
* handles this case in realmode hcall handlers.
*/
if (!kvmhv_vcpu_is_radix(vcpu)) {
/*
* A guest could be running PR KVM, so this
* may be a PR KVM hcall. It must be reflected
* to the guest kernel as a sc interrupt.
*/
kvmppc_core_queue_syscall(vcpu);
} else {
/*
* Radix guests can not run PR KVM or nested HV
* hash guests which might run PR KVM, so this
* is always a privilege fault. Send a program
* check to guest kernel.
*/
kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);
}
r = RESUME_GUEST;
break;
}
/*
* hcall - gather args and set exit_reason. This will next be
* handled by kvmppc_pseries_do_hcall which may be able to deal
* with it and resume guest, or may punt to userspace.
*/
run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
for (i = 0; i < 9; ++i)
run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
run->exit_reason = KVM_EXIT_PAPR_HCALL;
vcpu->arch.hcall_needed = 1;
r = RESUME_HOST;
break;
}
/*
* We get these next two if the guest accesses a page which it thinks
* it has mapped but which is not actually present, either because
* it is for an emulated I/O device or because the corresonding
* host page has been paged out.
*
* Any other HDSI/HISI interrupts have been handled already for P7/8
* guests. For POWER9 hash guests not using rmhandlers, basic hash
* fault handling is done here.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE: {
unsigned long vsid;
long err;
if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) &&
unlikely(vcpu->arch.fault_dsisr == HDSISR_CANARY)) {
r = RESUME_GUEST; /* Just retry if it's the canary */
break;
}
if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) {
/*
* Radix doesn't require anything, and pre-ISAv3.0 hash
* already attempted to handle this in rmhandlers. The
* hash fault handling below is v3 only (it uses ASDR
* via fault_gpa).
*/
r = RESUME_PAGE_FAULT;
break;
}
if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) {
kvmppc_core_queue_data_storage(vcpu,
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
r = RESUME_GUEST;
break;
}
if (!(vcpu->arch.shregs.msr & MSR_DR))
vsid = vcpu->kvm->arch.vrma_slb_v;
else
vsid = vcpu->arch.fault_gpa;
err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar,
vsid, vcpu->arch.fault_dsisr, true);
if (err == 0) {
r = RESUME_GUEST;
} else if (err == -1 || err == -2) {
r = RESUME_PAGE_FAULT;
} else {
kvmppc_core_queue_data_storage(vcpu,
vcpu->arch.fault_dar, err);
r = RESUME_GUEST;
}
break;
}
case BOOK3S_INTERRUPT_H_INST_STORAGE: {
unsigned long vsid;
long err;
vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr &
DSISR_SRR1_MATCH_64S;
if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) {
/*
* Radix doesn't require anything, and pre-ISAv3.0 hash
* already attempted to handle this in rmhandlers. The
* hash fault handling below is v3 only (it uses ASDR
* via fault_gpa).
*/
if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
r = RESUME_PAGE_FAULT;
break;
}
if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) {
kvmppc_core_queue_inst_storage(vcpu,
vcpu->arch.fault_dsisr);
r = RESUME_GUEST;
break;
}
if (!(vcpu->arch.shregs.msr & MSR_IR))
vsid = vcpu->kvm->arch.vrma_slb_v;
else
vsid = vcpu->arch.fault_gpa;
err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar,
vsid, vcpu->arch.fault_dsisr, false);
if (err == 0) {
r = RESUME_GUEST;
} else if (err == -1) {
r = RESUME_PAGE_FAULT;
} else {
kvmppc_core_queue_inst_storage(vcpu, err);
r = RESUME_GUEST;
}
break;
}
/*
* This occurs if the guest executes an illegal instruction.
* If the guest debug is disabled, generate a program interrupt
* to the guest. If guest debug is enabled, we need to check
* whether the instruction is a software breakpoint instruction.
* Accordingly return to Guest or Host.
*/
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
swab32(vcpu->arch.emul_inst) :
vcpu->arch.emul_inst;
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
r = kvmppc_emulate_debug_inst(vcpu);
} else {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
r = RESUME_GUEST;
}
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case BOOK3S_INTERRUPT_HV_SOFTPATCH:
/*
* This occurs for various TM-related instructions that
* we need to emulate on POWER9 DD2.2. We have already
* handled the cases where the guest was in real-suspend
* mode and was transitioning to transactional state.
*/
r = kvmhv_p9_tm_emulation(vcpu);
if (r != -1)
break;
fallthrough; /* go to facility unavailable handler */
#endif
/*
* This occurs if the guest (kernel or userspace), does something that
* is prohibited by HFSCR.
* On POWER9, this could be a doorbell instruction that we need
* to emulate.
* Otherwise, we just generate a program interrupt to the guest.
*/
case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: {
u64 cause = vcpu->arch.hfscr >> 56;
r = EMULATE_FAIL;
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (cause == FSCR_MSGP_LG)
r = kvmppc_emulate_doorbell_instr(vcpu);
if (cause == FSCR_PM_LG)
r = kvmppc_pmu_unavailable(vcpu);
if (cause == FSCR_EBB_LG)
r = kvmppc_ebb_unavailable(vcpu);
if (cause == FSCR_TM_LG)
r = kvmppc_tm_unavailable(vcpu);
}
if (r == EMULATE_FAIL) {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
r = RESUME_GUEST;
}
break;
}
case BOOK3S_INTERRUPT_HV_RM_HARD:
r = RESUME_PASSTHROUGH;
break;
default:
kvmppc_dump_regs(vcpu);
printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
run->hw.hardware_exit_reason = vcpu->arch.trap;
r = RESUME_HOST;
break;
}
return r;
}
static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)
{
int r;
int srcu_idx;
vcpu->stat.sum_exits++;
/*
* This can happen if an interrupt occurs in the last stages
* of guest entry or the first stages of guest exit (i.e. after
* setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
* and before setting it to KVM_GUEST_MODE_HOST_HV).
* That can happen due to a bug, or due to a machine check
* occurring at just the wrong time.
*/
if (vcpu->arch.shregs.msr & MSR_HV) {
pr_emerg("KVM trap in HV mode while nested!\n");
pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
kvmppc_dump_regs(vcpu);
return RESUME_HOST;
}
switch (vcpu->arch.trap) {
/* We're good on these - the host merely wanted to get our attention */
case BOOK3S_INTERRUPT_HV_DECREMENTER:
vcpu->stat.dec_exits++;
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_EXTERNAL:
vcpu->stat.ext_intr_exits++;
r = RESUME_HOST;
break;
case BOOK3S_INTERRUPT_H_DOORBELL:
case BOOK3S_INTERRUPT_H_VIRT:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
/* These need to go to the nested HV */
case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER:
vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER;
vcpu->stat.dec_exits++;
r = RESUME_HOST;
break;
/* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
case BOOK3S_INTERRUPT_HMI:
case BOOK3S_INTERRUPT_PERFMON:
case BOOK3S_INTERRUPT_SYSTEM_RESET:
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_MACHINE_CHECK:
{
static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
/* Pass the machine check to the L1 guest */
r = RESUME_HOST;
/* Print the MCE event to host console. */
if (__ratelimit(&rs))
machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
break;
}
/*
* We get these next two if the guest accesses a page which it thinks
* it has mapped but which is not actually present, either because
* it is for an emulated I/O device or because the corresonding
* host page has been paged out.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvmhv_nested_page_fault(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
break;
case BOOK3S_INTERRUPT_H_INST_STORAGE:
vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) &
DSISR_SRR1_MATCH_64S;
if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvmhv_nested_page_fault(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case BOOK3S_INTERRUPT_HV_SOFTPATCH:
/*
* This occurs for various TM-related instructions that
* we need to emulate on POWER9 DD2.2. We have already
* handled the cases where the guest was in real-suspend
* mode and was transitioning to transactional state.
*/
r = kvmhv_p9_tm_emulation(vcpu);
if (r != -1)
break;
fallthrough; /* go to facility unavailable handler */
#endif
case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: {
u64 cause = vcpu->arch.hfscr >> 56;
/*
* Only pass HFU interrupts to the L1 if the facility is
* permitted but disabled by the L1's HFSCR, otherwise
* the interrupt does not make sense to the L1 so turn
* it into a HEAI.
*/
if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) ||
(vcpu->arch.nested_hfscr & (1UL << cause))) {
vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST;
/*
* If the fetch failed, return to guest and
* try executing it again.
*/
r = kvmppc_get_last_inst(vcpu, INST_GENERIC,
&vcpu->arch.emul_inst);
if (r != EMULATE_DONE)
r = RESUME_GUEST;
else
r = RESUME_HOST;
} else {
r = RESUME_HOST;
}
break;
}
case BOOK3S_INTERRUPT_HV_RM_HARD:
vcpu->arch.trap = 0;
r = RESUME_GUEST;
if (!xics_on_xive())
kvmppc_xics_rm_complete(vcpu, 0);
break;
case BOOK3S_INTERRUPT_SYSCALL:
{
unsigned long req = kvmppc_get_gpr(vcpu, 3);
/*
* The H_RPT_INVALIDATE hcalls issued by nested
* guests for process-scoped invalidations when
* GTSE=0, are handled here in L0.
*/
if (req == H_RPT_INVALIDATE) {
r = kvmppc_nested_h_rpt_invalidate(vcpu);
break;
}
r = RESUME_HOST;
break;
}
default:
r = RESUME_HOST;
break;
}
return r;
}
static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i;
memset(sregs, 0, sizeof(struct kvm_sregs));
sregs->pvr = vcpu->arch.pvr;
for (i = 0; i < vcpu->arch.slb_max; i++) {
sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
}
return 0;
}
static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i, j;
/* Only accept the same PVR as the host's, since we can't spoof it */
if (sregs->pvr != vcpu->arch.pvr)
return -EINVAL;
j = 0;
for (i = 0; i < vcpu->arch.slb_nr; i++) {
if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
++j;
}
}
vcpu->arch.slb_max = j;
return 0;
}
/*
* Enforce limits on guest LPCR values based on hardware availability,
* guest configuration, and possibly hypervisor support and security
* concerns.
*/
unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr)
{
/* LPCR_TC only applies to HPT guests */
if (kvm_is_radix(kvm))
lpcr &= ~LPCR_TC;
/* On POWER8 and above, userspace can modify AIL */
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
lpcr &= ~LPCR_AIL;
if ((lpcr & LPCR_AIL) != LPCR_AIL_3)
lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */
/*
* On some POWER9s we force AIL off for radix guests to prevent
* executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to
* guest, which can result in Q0 translations with LPID=0 PID=PIDR to
* be cached, which the host TLB management does not expect.
*/
if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG))
lpcr &= ~LPCR_AIL;
/*
* On POWER9, allow userspace to enable large decrementer for the
* guest, whether or not the host has it enabled.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300))
lpcr &= ~LPCR_LD;
return lpcr;
}
static void verify_lpcr(struct kvm *kvm, unsigned long lpcr)
{
if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) {
WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n",
lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr));
}
}
static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
bool preserve_top32)
{
struct kvm *kvm = vcpu->kvm;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
u64 mask;
spin_lock(&vc->lock);
/*
* Userspace can only modify
* DPFD (default prefetch depth), ILE (interrupt little-endian),
* TC (translation control), AIL (alternate interrupt location),
* LD (large decrementer).
* These are subject to restrictions from kvmppc_filter_lcpr_hv().
*/
mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD;
/* Broken 32-bit version of LPCR must not clear top bits */
if (preserve_top32)
mask &= 0xFFFFFFFF;
new_lpcr = kvmppc_filter_lpcr_hv(kvm,
(vc->lpcr & ~mask) | (new_lpcr & mask));
/*
* If ILE (interrupt little-endian) has changed, update the
* MSR_LE bit in the intr_msr for each vcpu in this vcore.
*/
if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
struct kvm_vcpu *vcpu;
unsigned long i;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.vcore != vc)
continue;
if (new_lpcr & LPCR_ILE)
vcpu->arch.intr_msr |= MSR_LE;
else
vcpu->arch.intr_msr &= ~MSR_LE;
}
}
vc->lpcr = new_lpcr;
spin_unlock(&vc->lock);
}
static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
union kvmppc_one_reg *val)
{
int r = 0;
long int i;
switch (id) {
case KVM_REG_PPC_DEBUG_INST:
*val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
break;
case KVM_REG_PPC_HIOR:
*val = get_reg_val(id, 0);
break;
case KVM_REG_PPC_DABR:
*val = get_reg_val(id, vcpu->arch.dabr);
break;
case KVM_REG_PPC_DABRX:
*val = get_reg_val(id, vcpu->arch.dabrx);
break;
case KVM_REG_PPC_DSCR:
*val = get_reg_val(id, vcpu->arch.dscr);
break;
case KVM_REG_PPC_PURR:
*val = get_reg_val(id, vcpu->arch.purr);
break;
case KVM_REG_PPC_SPURR:
*val = get_reg_val(id, vcpu->arch.spurr);
break;
case KVM_REG_PPC_AMR:
*val = get_reg_val(id, vcpu->arch.amr);
break;
case KVM_REG_PPC_UAMOR:
*val = get_reg_val(id, vcpu->arch.uamor);
break;
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1:
i = id - KVM_REG_PPC_MMCR0;
*val = get_reg_val(id, vcpu->arch.mmcr[i]);
break;
case KVM_REG_PPC_MMCR2:
*val = get_reg_val(id, vcpu->arch.mmcr[2]);
break;
case KVM_REG_PPC_MMCRA:
*val = get_reg_val(id, vcpu->arch.mmcra);
break;
case KVM_REG_PPC_MMCRS:
*val = get_reg_val(id, vcpu->arch.mmcrs);
break;
case KVM_REG_PPC_MMCR3:
*val = get_reg_val(id, vcpu->arch.mmcr[3]);
break;
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
i = id - KVM_REG_PPC_PMC1;
*val = get_reg_val(id, vcpu->arch.pmc[i]);
break;
case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
i = id - KVM_REG_PPC_SPMC1;
*val = get_reg_val(id, vcpu->arch.spmc[i]);
break;
case KVM_REG_PPC_SIAR:
*val = get_reg_val(id, vcpu->arch.siar);
break;
case KVM_REG_PPC_SDAR:
*val = get_reg_val(id, vcpu->arch.sdar);
break;
case KVM_REG_PPC_SIER:
*val = get_reg_val(id, vcpu->arch.sier[0]);
break;
case KVM_REG_PPC_SIER2:
*val = get_reg_val(id, vcpu->arch.sier[1]);
break;
case KVM_REG_PPC_SIER3:
*val = get_reg_val(id, vcpu->arch.sier[2]);
break;
case KVM_REG_PPC_IAMR:
*val = get_reg_val(id, vcpu->arch.iamr);
break;
case KVM_REG_PPC_PSPB:
*val = get_reg_val(id, vcpu->arch.pspb);
break;
case KVM_REG_PPC_DPDES:
/*
* On POWER9, where we are emulating msgsndp etc.,
* we return 1 bit for each vcpu, which can come from
* either vcore->dpdes or doorbell_request.
* On POWER8, doorbell_request is 0.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
*val = get_reg_val(id, vcpu->arch.doorbell_request);
else
*val = get_reg_val(id, vcpu->arch.vcore->dpdes);
break;
case KVM_REG_PPC_VTB:
*val = get_reg_val(id, vcpu->arch.vcore->vtb);
break;
case KVM_REG_PPC_DAWR:
*val = get_reg_val(id, vcpu->arch.dawr0);
break;
case KVM_REG_PPC_DAWRX:
*val = get_reg_val(id, vcpu->arch.dawrx0);
break;
case KVM_REG_PPC_DAWR1:
*val = get_reg_val(id, vcpu->arch.dawr1);
break;
case KVM_REG_PPC_DAWRX1:
*val = get_reg_val(id, vcpu->arch.dawrx1);
break;
case KVM_REG_PPC_CIABR:
*val = get_reg_val(id, vcpu->arch.ciabr);
break;
case KVM_REG_PPC_CSIGR:
*val = get_reg_val(id, vcpu->arch.csigr);
break;
case KVM_REG_PPC_TACR:
*val = get_reg_val(id, vcpu->arch.tacr);
break;
case KVM_REG_PPC_TCSCR:
*val = get_reg_val(id, vcpu->arch.tcscr);
break;
case KVM_REG_PPC_PID:
*val = get_reg_val(id, vcpu->arch.pid);
break;
case KVM_REG_PPC_ACOP:
*val = get_reg_val(id, vcpu->arch.acop);
break;
case KVM_REG_PPC_WORT:
*val = get_reg_val(id, vcpu->arch.wort);
break;
case KVM_REG_PPC_TIDR:
*val = get_reg_val(id, vcpu->arch.tid);
break;
case KVM_REG_PPC_PSSCR:
*val = get_reg_val(id, vcpu->arch.psscr);
break;
case KVM_REG_PPC_VPA_ADDR:
spin_lock(&vcpu->arch.vpa_update_lock);
*val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_VPA_SLB:
spin_lock(&vcpu->arch.vpa_update_lock);
val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
val->vpaval.length = vcpu->arch.slb_shadow.len;
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_VPA_DTL:
spin_lock(&vcpu->arch.vpa_update_lock);
val->vpaval.addr = vcpu->arch.dtl.next_gpa;
val->vpaval.length = vcpu->arch.dtl.len;
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_TB_OFFSET:
*val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
break;
case KVM_REG_PPC_LPCR:
case KVM_REG_PPC_LPCR_64:
*val = get_reg_val(id, vcpu->arch.vcore->lpcr);
break;
case KVM_REG_PPC_PPR:
*val = get_reg_val(id, vcpu->arch.ppr);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case KVM_REG_PPC_TFHAR:
*val = get_reg_val(id, vcpu->arch.tfhar);
break;
case KVM_REG_PPC_TFIAR:
*val = get_reg_val(id, vcpu->arch.tfiar);
break;
case KVM_REG_PPC_TEXASR:
*val = get_reg_val(id, vcpu->arch.texasr);
break;
case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
i = id - KVM_REG_PPC_TM_GPR0;
*val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
break;
case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
{
int j;
i = id - KVM_REG_PPC_TM_VSR0;
if (i < 32)
for (j = 0; j < TS_FPRWIDTH; j++)
val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
else {
if (cpu_has_feature(CPU_FTR_ALTIVEC))
val->vval = vcpu->arch.vr_tm.vr[i-32];
else
r = -ENXIO;
}
break;
}
case KVM_REG_PPC_TM_CR:
*val = get_reg_val(id, vcpu->arch.cr_tm);
break;
case KVM_REG_PPC_TM_XER:
*val = get_reg_val(id, vcpu->arch.xer_tm);
break;
case KVM_REG_PPC_TM_LR:
*val = get_reg_val(id, vcpu->arch.lr_tm);
break;
case KVM_REG_PPC_TM_CTR:
*val = get_reg_val(id, vcpu->arch.ctr_tm);
break;
case KVM_REG_PPC_TM_FPSCR:
*val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
break;
case KVM_REG_PPC_TM_AMR:
*val = get_reg_val(id, vcpu->arch.amr_tm);
break;
case KVM_REG_PPC_TM_PPR:
*val = get_reg_val(id, vcpu->arch.ppr_tm);
break;
case KVM_REG_PPC_TM_VRSAVE:
*val = get_reg_val(id, vcpu->arch.vrsave_tm);
break;
case KVM_REG_PPC_TM_VSCR:
if (cpu_has_feature(CPU_FTR_ALTIVEC))
*val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
else
r = -ENXIO;
break;
case KVM_REG_PPC_TM_DSCR:
*val = get_reg_val(id, vcpu->arch.dscr_tm);
break;
case KVM_REG_PPC_TM_TAR:
*val = get_reg_val(id, vcpu->arch.tar_tm);
break;
#endif
case KVM_REG_PPC_ARCH_COMPAT:
*val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
break;
case KVM_REG_PPC_DEC_EXPIRY:
*val = get_reg_val(id, vcpu->arch.dec_expires);
break;
case KVM_REG_PPC_ONLINE:
*val = get_reg_val(id, vcpu->arch.online);
break;
case KVM_REG_PPC_PTCR:
*val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr);
break;
default:
r = -EINVAL;
break;
}
return r;
}
static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
union kvmppc_one_reg *val)
{
int r = 0;
long int i;
unsigned long addr, len;
switch (id) {
case KVM_REG_PPC_HIOR:
/* Only allow this to be set to zero */
if (set_reg_val(id, *val))
r = -EINVAL;
break;
case KVM_REG_PPC_DABR:
vcpu->arch.dabr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DABRX:
vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
break;
case KVM_REG_PPC_DSCR:
vcpu->arch.dscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PURR:
vcpu->arch.purr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SPURR:
vcpu->arch.spurr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_AMR:
vcpu->arch.amr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_UAMOR:
vcpu->arch.uamor = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1:
i = id - KVM_REG_PPC_MMCR0;
vcpu->arch.mmcr[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCR2:
vcpu->arch.mmcr[2] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCRA:
vcpu->arch.mmcra = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCRS:
vcpu->arch.mmcrs = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCR3:
*val = get_reg_val(id, vcpu->arch.mmcr[3]);
break;
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
i = id - KVM_REG_PPC_PMC1;
vcpu->arch.pmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
i = id - KVM_REG_PPC_SPMC1;
vcpu->arch.spmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIAR:
vcpu->arch.siar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SDAR:
vcpu->arch.sdar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIER:
vcpu->arch.sier[0] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIER2:
vcpu->arch.sier[1] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIER3:
vcpu->arch.sier[2] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_IAMR:
vcpu->arch.iamr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PSPB:
vcpu->arch.pspb = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DPDES:
if (cpu_has_feature(CPU_FTR_ARCH_300))
vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1;
else
vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
break;
case KVM_REG_PPC_VTB:
vcpu->arch.vcore->vtb = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWR:
vcpu->arch.dawr0 = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWRX:
vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP;
break;
case KVM_REG_PPC_DAWR1:
vcpu->arch.dawr1 = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWRX1:
vcpu->arch.dawrx1 = set_reg_val(id, *val) & ~DAWRX_HYP;
break;
case KVM_REG_PPC_CIABR:
vcpu->arch.ciabr = set_reg_val(id, *val);
/* Don't allow setting breakpoints in hypervisor code */
if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
break;
case KVM_REG_PPC_CSIGR:
vcpu->arch.csigr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TACR:
vcpu->arch.tacr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TCSCR:
vcpu->arch.tcscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PID:
vcpu->arch.pid = set_reg_val(id, *val);
break;
case KVM_REG_PPC_ACOP:
vcpu->arch.acop = set_reg_val(id, *val);
break;
case KVM_REG_PPC_WORT:
vcpu->arch.wort = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TIDR:
vcpu->arch.tid = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PSSCR:
vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
break;
case KVM_REG_PPC_VPA_ADDR:
addr = set_reg_val(id, *val);
r = -EINVAL;
if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
vcpu->arch.dtl.next_gpa))
break;
r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
break;
case KVM_REG_PPC_VPA_SLB:
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (addr && !vcpu->arch.vpa.next_gpa)
break;
r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
break;
case KVM_REG_PPC_VPA_DTL:
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (addr && (len < sizeof(struct dtl_entry) ||
!vcpu->arch.vpa.next_gpa))
break;
len -= len % sizeof(struct dtl_entry);
r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
break;
case KVM_REG_PPC_TB_OFFSET:
{
/* round up to multiple of 2^24 */
u64 tb_offset = ALIGN(set_reg_val(id, *val), 1UL << 24);
/*
* Now that we know the timebase offset, update the
* decrementer expiry with a guest timebase value. If
* the userspace does not set DEC_EXPIRY, this ensures
* a migrated vcpu at least starts with an expired
* decrementer, which is better than a large one that
* causes a hang.
*/
if (!vcpu->arch.dec_expires && tb_offset)
vcpu->arch.dec_expires = get_tb() + tb_offset;
vcpu->arch.vcore->tb_offset = tb_offset;
break;
}
case KVM_REG_PPC_LPCR:
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
break;
case KVM_REG_PPC_LPCR_64:
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
break;
case KVM_REG_PPC_PPR:
vcpu->arch.ppr = set_reg_val(id, *val);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case KVM_REG_PPC_TFHAR:
vcpu->arch.tfhar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TFIAR:
vcpu->arch.tfiar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TEXASR:
vcpu->arch.texasr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
i = id - KVM_REG_PPC_TM_GPR0;
vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
{
int j;
i = id - KVM_REG_PPC_TM_VSR0;
if (i < 32)
for (j = 0; j < TS_FPRWIDTH; j++)
vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
else
if (cpu_has_feature(CPU_FTR_ALTIVEC))
vcpu->arch.vr_tm.vr[i-32] = val->vval;
else
r = -ENXIO;
break;
}
case KVM_REG_PPC_TM_CR:
vcpu->arch.cr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_XER:
vcpu->arch.xer_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_LR:
vcpu->arch.lr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_CTR:
vcpu->arch.ctr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_FPSCR:
vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_AMR:
vcpu->arch.amr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_PPR:
vcpu->arch.ppr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VRSAVE:
vcpu->arch.vrsave_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VSCR:
if (cpu_has_feature(CPU_FTR_ALTIVEC))
vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
else
r = - ENXIO;
break;
case KVM_REG_PPC_TM_DSCR:
vcpu->arch.dscr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_TAR:
vcpu->arch.tar_tm = set_reg_val(id, *val);
break;
#endif
case KVM_REG_PPC_ARCH_COMPAT:
r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
break;
case KVM_REG_PPC_DEC_EXPIRY:
vcpu->arch.dec_expires = set_reg_val(id, *val);
break;
case KVM_REG_PPC_ONLINE:
i = set_reg_val(id, *val);
if (i && !vcpu->arch.online)
atomic_inc(&vcpu->arch.vcore->online_count);
else if (!i && vcpu->arch.online)
atomic_dec(&vcpu->arch.vcore->online_count);
vcpu->arch.online = i;
break;
case KVM_REG_PPC_PTCR:
vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val);
break;
default:
r = -EINVAL;
break;
}
return r;
}
/*
* On POWER9, threads are independent and can be in different partitions.
* Therefore we consider each thread to be a subcore.
* There is a restriction that all threads have to be in the same
* MMU mode (radix or HPT), unfortunately, but since we only support
* HPT guests on a HPT host so far, that isn't an impediment yet.
*/
static int threads_per_vcore(struct kvm *kvm)
{
if (cpu_has_feature(CPU_FTR_ARCH_300))
return 1;
return threads_per_subcore;
}
static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id)
{
struct kvmppc_vcore *vcore;
vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
if (vcore == NULL)
return NULL;
spin_lock_init(&vcore->lock);
spin_lock_init(&vcore->stoltb_lock);
rcuwait_init(&vcore->wait);
vcore->preempt_tb = TB_NIL;
vcore->lpcr = kvm->arch.lpcr;
vcore->first_vcpuid = id;
vcore->kvm = kvm;
INIT_LIST_HEAD(&vcore->preempt_list);
return vcore;
}
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
static struct debugfs_timings_element {
const char *name;
size_t offset;
} timings[] = {
#ifdef CONFIG_KVM_BOOK3S_HV_P9_TIMING
{"vcpu_entry", offsetof(struct kvm_vcpu, arch.vcpu_entry)},
{"guest_entry", offsetof(struct kvm_vcpu, arch.guest_entry)},
{"in_guest", offsetof(struct kvm_vcpu, arch.in_guest)},
{"guest_exit", offsetof(struct kvm_vcpu, arch.guest_exit)},
{"vcpu_exit", offsetof(struct kvm_vcpu, arch.vcpu_exit)},
{"hypercall", offsetof(struct kvm_vcpu, arch.hcall)},
{"page_fault", offsetof(struct kvm_vcpu, arch.pg_fault)},
#else
{"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
{"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
{"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
{"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
{"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
#endif
};
#define N_TIMINGS (ARRAY_SIZE(timings))
struct debugfs_timings_state {
struct kvm_vcpu *vcpu;
unsigned int buflen;
char buf[N_TIMINGS * 100];
};
static int debugfs_timings_open(struct inode *inode, struct file *file)
{
struct kvm_vcpu *vcpu = inode->i_private;
struct debugfs_timings_state *p;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
kvm_get_kvm(vcpu->kvm);
p->vcpu = vcpu;
file->private_data = p;
return nonseekable_open(inode, file);
}
static int debugfs_timings_release(struct inode *inode, struct file *file)
{
struct debugfs_timings_state *p = file->private_data;
kvm_put_kvm(p->vcpu->kvm);
kfree(p);
return 0;
}
static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos)
{
struct debugfs_timings_state *p = file->private_data;
struct kvm_vcpu *vcpu = p->vcpu;
char *s, *buf_end;
struct kvmhv_tb_accumulator tb;
u64 count;
loff_t pos;
ssize_t n;
int i, loops;
bool ok;
if (!p->buflen) {
s = p->buf;
buf_end = s + sizeof(p->buf);
for (i = 0; i < N_TIMINGS; ++i) {
struct kvmhv_tb_accumulator *acc;
acc = (struct kvmhv_tb_accumulator *)
((unsigned long)vcpu + timings[i].offset);
ok = false;
for (loops = 0; loops < 1000; ++loops) {
count = acc->seqcount;
if (!(count & 1)) {
smp_rmb();
tb = *acc;
smp_rmb();
if (count == acc->seqcount) {
ok = true;
break;
}
}
udelay(1);
}
if (!ok)
snprintf(s, buf_end - s, "%s: stuck\n",
timings[i].name);
else
snprintf(s, buf_end - s,
"%s: %llu %llu %llu %llu\n",
timings[i].name, count / 2,
tb_to_ns(tb.tb_total),
tb_to_ns(tb.tb_min),
tb_to_ns(tb.tb_max));
s += strlen(s);
}
p->buflen = s - p->buf;
}
pos = *ppos;
if (pos >= p->buflen)
return 0;
if (len > p->buflen - pos)
len = p->buflen - pos;
n = copy_to_user(buf, p->buf + pos, len);
if (n) {
if (n == len)
return -EFAULT;
len -= n;
}
*ppos = pos + len;
return len;
}
static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
return -EACCES;
}
static const struct file_operations debugfs_timings_ops = {
.owner = THIS_MODULE,
.open = debugfs_timings_open,
.release = debugfs_timings_release,
.read = debugfs_timings_read,
.write = debugfs_timings_write,
.llseek = generic_file_llseek,
};
/* Create a debugfs directory for the vcpu */
static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
{
if (cpu_has_feature(CPU_FTR_ARCH_300) == IS_ENABLED(CONFIG_KVM_BOOK3S_HV_P9_TIMING))
debugfs_create_file("timings", 0444, debugfs_dentry, vcpu,
&debugfs_timings_ops);
return 0;
}
#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
{
return 0;
}
#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu)
{
int err;
int core;
struct kvmppc_vcore *vcore;
struct kvm *kvm;
unsigned int id;
kvm = vcpu->kvm;
id = vcpu->vcpu_id;
vcpu->arch.shared = &vcpu->arch.shregs;
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
/*
* The shared struct is never shared on HV,
* so we can always use host endianness
*/
#ifdef __BIG_ENDIAN__
vcpu->arch.shared_big_endian = true;
#else
vcpu->arch.shared_big_endian = false;
#endif
#endif
vcpu->arch.mmcr[0] = MMCR0_FC;
if (cpu_has_feature(CPU_FTR_ARCH_31)) {
vcpu->arch.mmcr[0] |= MMCR0_PMCCEXT;
vcpu->arch.mmcra = MMCRA_BHRB_DISABLE;
}
vcpu->arch.ctrl = CTRL_RUNLATCH;
/* default to host PVR, since we can't spoof it */
kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
spin_lock_init(&vcpu->arch.vpa_update_lock);
spin_lock_init(&vcpu->arch.tbacct_lock);
vcpu->arch.busy_preempt = TB_NIL;
vcpu->arch.shregs.msr = MSR_ME;
vcpu->arch.intr_msr = MSR_SF | MSR_ME;
/*
* Set the default HFSCR for the guest from the host value.
* This value is only used on POWER9.
* On POWER9, we want to virtualize the doorbell facility, so we
* don't set the HFSCR_MSGP bit, and that causes those instructions
* to trap and then we emulate them.
*/
vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB |
HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP;
if (cpu_has_feature(CPU_FTR_HVMODE)) {
vcpu->arch.hfscr &= mfspr(SPRN_HFSCR);
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
vcpu->arch.hfscr |= HFSCR_TM;
#endif
}
if (cpu_has_feature(CPU_FTR_TM_COMP))
vcpu->arch.hfscr |= HFSCR_TM;
vcpu->arch.hfscr_permitted = vcpu->arch.hfscr;
/*
* PM, EBB, TM are demand-faulted so start with it clear.
*/
vcpu->arch.hfscr &= ~(HFSCR_PM | HFSCR_EBB | HFSCR_TM);
kvmppc_mmu_book3s_hv_init(vcpu);
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
init_waitqueue_head(&vcpu->arch.cpu_run);
mutex_lock(&kvm->lock);
vcore = NULL;
err = -EINVAL;
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) {
pr_devel("KVM: VCPU ID too high\n");
core = KVM_MAX_VCORES;
} else {
BUG_ON(kvm->arch.smt_mode != 1);
core = kvmppc_pack_vcpu_id(kvm, id);
}
} else {
core = id / kvm->arch.smt_mode;
}
if (core < KVM_MAX_VCORES) {
vcore = kvm->arch.vcores[core];
if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) {
pr_devel("KVM: collision on id %u", id);
vcore = NULL;
} else if (!vcore) {
/*
* Take mmu_setup_lock for mutual exclusion
* with kvmppc_update_lpcr().
*/
err = -ENOMEM;
vcore = kvmppc_vcore_create(kvm,
id & ~(kvm->arch.smt_mode - 1));
mutex_lock(&kvm->arch.mmu_setup_lock);
kvm->arch.vcores[core] = vcore;
kvm->arch.online_vcores++;
mutex_unlock(&kvm->arch.mmu_setup_lock);
}
}
mutex_unlock(&kvm->lock);
if (!vcore)
return err;
spin_lock(&vcore->lock);
++vcore->num_threads;
spin_unlock(&vcore->lock);
vcpu->arch.vcore = vcore;
vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
vcpu->arch.thread_cpu = -1;
vcpu->arch.prev_cpu = -1;
vcpu->arch.cpu_type = KVM_CPU_3S_64;
kvmppc_sanity_check(vcpu);
return 0;
}
static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
unsigned long flags)
{
int err;
int esmt = 0;
if (flags)
return -EINVAL;
if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode))
return -EINVAL;
if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
/*
* On POWER8 (or POWER7), the threading mode is "strict",
* so we pack smt_mode vcpus per vcore.
*/
if (smt_mode > threads_per_subcore)
return -EINVAL;
} else {
/*
* On POWER9, the threading mode is "loose",
* so each vcpu gets its own vcore.
*/
esmt = smt_mode;
smt_mode = 1;
}
mutex_lock(&kvm->lock);
err = -EBUSY;
if (!kvm->arch.online_vcores) {
kvm->arch.smt_mode = smt_mode;
kvm->arch.emul_smt_mode = esmt;
err = 0;
}
mutex_unlock(&kvm->lock);
return err;
}
static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
{
if (vpa->pinned_addr)
kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
vpa->dirty);
}
static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
{
spin_lock(&vcpu->arch.vpa_update_lock);
unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
{
/* Indicate we want to get back into the guest */
return 1;
}
static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec, now;
now = get_tb();
if (now > kvmppc_dec_expires_host_tb(vcpu)) {
/* decrementer has already gone negative */
kvmppc_core_queue_dec(vcpu);
kvmppc_core_prepare_to_enter(vcpu);
return;
}
dec_nsec = tb_to_ns(kvmppc_dec_expires_host_tb(vcpu) - now);
hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
vcpu->arch.timer_running = 1;
}
extern int __kvmppc_vcore_entry(void);
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu, u64 tb)
{
u64 now;
if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
spin_lock_irq(&vcpu->arch.tbacct_lock);
now = tb;
vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
vcpu->arch.stolen_logged;
vcpu->arch.busy_preempt = now;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
spin_unlock_irq(&vcpu->arch.tbacct_lock);
--vc->n_runnable;
WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
}
static int kvmppc_grab_hwthread(int cpu)
{
struct paca_struct *tpaca;
long timeout = 10000;
tpaca = paca_ptrs[cpu];
/* Ensure the thread won't go into the kernel if it wakes */
tpaca->kvm_hstate.kvm_vcpu = NULL;
tpaca->kvm_hstate.kvm_vcore = NULL;
tpaca->kvm_hstate.napping = 0;
smp_wmb();
tpaca->kvm_hstate.hwthread_req = 1;
/*
* If the thread is already executing in the kernel (e.g. handling
* a stray interrupt), wait for it to get back to nap mode.
* The smp_mb() is to ensure that our setting of hwthread_req
* is visible before we look at hwthread_state, so if this
* races with the code at system_reset_pSeries and the thread
* misses our setting of hwthread_req, we are sure to see its
* setting of hwthread_state, and vice versa.
*/
smp_mb();
while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
if (--timeout <= 0) {
pr_err("KVM: couldn't grab cpu %d\n", cpu);
return -EBUSY;
}
udelay(1);
}
return 0;
}
static void kvmppc_release_hwthread(int cpu)
{
struct paca_struct *tpaca;
tpaca = paca_ptrs[cpu];
tpaca->kvm_hstate.hwthread_req = 0;
tpaca->kvm_hstate.kvm_vcpu = NULL;
tpaca->kvm_hstate.kvm_vcore = NULL;
tpaca->kvm_hstate.kvm_split_mode = NULL;
}
static DEFINE_PER_CPU(struct kvm *, cpu_in_guest);
static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
{
struct kvm_nested_guest *nested = vcpu->arch.nested;
cpumask_t *need_tlb_flush;
int i;
if (nested)
need_tlb_flush = &nested->need_tlb_flush;
else
need_tlb_flush = &kvm->arch.need_tlb_flush;
cpu = cpu_first_tlb_thread_sibling(cpu);
for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu);
i += cpu_tlb_thread_sibling_step())
cpumask_set_cpu(i, need_tlb_flush);
/*
* Make sure setting of bit in need_tlb_flush precedes testing of
* cpu_in_guest. The matching barrier on the other side is hwsync
* when switching to guest MMU mode, which happens between
* cpu_in_guest being set to the guest kvm, and need_tlb_flush bit
* being tested.
*/
smp_mb();
for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu);
i += cpu_tlb_thread_sibling_step()) {
struct kvm *running = *per_cpu_ptr(&cpu_in_guest, i);
if (running == kvm)
smp_call_function_single(i, do_nothing, NULL, 1);
}
}
static void do_migrate_away_vcpu(void *arg)
{
struct kvm_vcpu *vcpu = arg;
struct kvm *kvm = vcpu->kvm;
/*
* If the guest has GTSE, it may execute tlbie, so do a eieio; tlbsync;
* ptesync sequence on the old CPU before migrating to a new one, in
* case we interrupted the guest between a tlbie ; eieio ;
* tlbsync; ptesync sequence.
*
* Otherwise, ptesync is sufficient for ordering tlbiel sequences.
*/
if (kvm->arch.lpcr & LPCR_GTSE)
asm volatile("eieio; tlbsync; ptesync");
else
asm volatile("ptesync");
}
static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
{
struct kvm_nested_guest *nested = vcpu->arch.nested;
struct kvm *kvm = vcpu->kvm;
int prev_cpu;
if (!cpu_has_feature(CPU_FTR_HVMODE))
return;
if (nested)
prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id];
else
prev_cpu = vcpu->arch.prev_cpu;
/*
* With radix, the guest can do TLB invalidations itself,
* and it could choose to use the local form (tlbiel) if
* it is invalidating a translation that has only ever been
* used on one vcpu. However, that doesn't mean it has
* only ever been used on one physical cpu, since vcpus
* can move around between pcpus. To cope with this, when
* a vcpu moves from one pcpu to another, we need to tell
* any vcpus running on the same core as this vcpu previously
* ran to flush the TLB.
*/
if (prev_cpu != pcpu) {
if (prev_cpu >= 0) {
if (cpu_first_tlb_thread_sibling(prev_cpu) !=
cpu_first_tlb_thread_sibling(pcpu))
radix_flush_cpu(kvm, prev_cpu, vcpu);
smp_call_function_single(prev_cpu,
do_migrate_away_vcpu, vcpu, 1);
}
if (nested)
nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu;
else
vcpu->arch.prev_cpu = pcpu;
}
}
static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
{
int cpu;
struct paca_struct *tpaca;
cpu = vc->pcpu;
if (vcpu) {
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
cpu += vcpu->arch.ptid;
vcpu->cpu = vc->pcpu;
vcpu->arch.thread_cpu = cpu;
}
tpaca = paca_ptrs[cpu];
tpaca->kvm_hstate.kvm_vcpu = vcpu;
tpaca->kvm_hstate.ptid = cpu - vc->pcpu;
tpaca->kvm_hstate.fake_suspend = 0;
/* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
smp_wmb();
tpaca->kvm_hstate.kvm_vcore = vc;
if (cpu != smp_processor_id())
kvmppc_ipi_thread(cpu);
}
static void kvmppc_wait_for_nap(int n_threads)
{
int cpu = smp_processor_id();
int i, loops;
if (n_threads <= 1)
return;
for (loops = 0; loops < 1000000; ++loops) {
/*
* Check if all threads are finished.
* We set the vcore pointer when starting a thread
* and the thread clears it when finished, so we look
* for any threads that still have a non-NULL vcore ptr.
*/
for (i = 1; i < n_threads; ++i)
if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
break;
if (i == n_threads) {
HMT_medium();
return;
}
HMT_low();
}
HMT_medium();
for (i = 1; i < n_threads; ++i)
if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
}
/*
* Check that we are on thread 0 and that any other threads in
* this core are off-line. Then grab the threads so they can't
* enter the kernel.
*/
static int on_primary_thread(void)
{
int cpu = smp_processor_id();
int thr;
/* Are we on a primary subcore? */
if (cpu_thread_in_subcore(cpu))
return 0;
thr = 0;
while (++thr < threads_per_subcore)
if (cpu_online(cpu + thr))
return 0;
/* Grab all hw threads so they can't go into the kernel */
for (thr = 1; thr < threads_per_subcore; ++thr) {
if (kvmppc_grab_hwthread(cpu + thr)) {
/* Couldn't grab one; let the others go */
do {
kvmppc_release_hwthread(cpu + thr);
} while (--thr > 0);
return 0;
}
}
return 1;
}
/*
* A list of virtual cores for each physical CPU.
* These are vcores that could run but their runner VCPU tasks are
* (or may be) preempted.
*/
struct preempted_vcore_list {
struct list_head list;
spinlock_t lock;
};
static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
static void init_vcore_lists(void)
{
int cpu;
for_each_possible_cpu(cpu) {
struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
spin_lock_init(&lp->lock);
INIT_LIST_HEAD(&lp->list);
}
}
static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
{
struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
vc->vcore_state = VCORE_PREEMPT;
vc->pcpu = smp_processor_id();
if (vc->num_threads < threads_per_vcore(vc->kvm)) {
spin_lock(&lp->lock);
list_add_tail(&vc->preempt_list, &lp->list);
spin_unlock(&lp->lock);
}
/* Start accumulating stolen time */
kvmppc_core_start_stolen(vc, mftb());
}
static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
{
struct preempted_vcore_list *lp;
WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
kvmppc_core_end_stolen(vc, mftb());
if (!list_empty(&vc->preempt_list)) {
lp = &per_cpu(preempted_vcores, vc->pcpu);
spin_lock(&lp->lock);
list_del_init(&vc->preempt_list);
spin_unlock(&lp->lock);
}
vc->vcore_state = VCORE_INACTIVE;
}
/*
* This stores information about the virtual cores currently
* assigned to a physical core.
*/
struct core_info {
int n_subcores;
int max_subcore_threads;
int total_threads;
int subcore_threads[MAX_SUBCORES];
struct kvmppc_vcore *vc[MAX_SUBCORES];
};
/*
* This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
* respectively in 2-way micro-threading (split-core) mode on POWER8.
*/
static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
{
memset(cip, 0, sizeof(*cip));
cip->n_subcores = 1;
cip->max_subcore_threads = vc->num_threads;
cip->total_threads = vc->num_threads;
cip->subcore_threads[0] = vc->num_threads;
cip->vc[0] = vc;
}
static bool subcore_config_ok(int n_subcores, int n_threads)
{
/*
* POWER9 "SMT4" cores are permanently in what is effectively a 4-way
* split-core mode, with one thread per subcore.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
return n_subcores <= 4 && n_threads == 1;
/* On POWER8, can only dynamically split if unsplit to begin with */
if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
return false;
if (n_subcores > MAX_SUBCORES)
return false;
if (n_subcores > 1) {
if (!(dynamic_mt_modes & 2))
n_subcores = 4;
if (n_subcores > 2 && !(dynamic_mt_modes & 4))
return false;
}
return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
}
static void init_vcore_to_run(struct kvmppc_vcore *vc)
{
vc->entry_exit_map = 0;
vc->in_guest = 0;
vc->napping_threads = 0;
vc->conferring_threads = 0;
vc->tb_offset_applied = 0;
}
static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
{
int n_threads = vc->num_threads;
int sub;
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return false;
/* In one_vm_per_core mode, require all vcores to be from the same vm */
if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm)
return false;
if (n_threads < cip->max_subcore_threads)
n_threads = cip->max_subcore_threads;
if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
return false;
cip->max_subcore_threads = n_threads;
sub = cip->n_subcores;
++cip->n_subcores;
cip->total_threads += vc->num_threads;
cip->subcore_threads[sub] = vc->num_threads;
cip->vc[sub] = vc;
init_vcore_to_run(vc);
list_del_init(&vc->preempt_list);
return true;
}
/*
* Work out whether it is possible to piggyback the execution of
* vcore *pvc onto the execution of the other vcores described in *cip.
*/
static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
int target_threads)
{
if (cip->total_threads + pvc->num_threads > target_threads)
return false;
return can_dynamic_split(pvc, cip);
}
static void prepare_threads(struct kvmppc_vcore *vc)
{
int i;
struct kvm_vcpu *vcpu;
for_each_runnable_thread(i, vcpu, vc) {
if (signal_pending(vcpu->arch.run_task))
vcpu->arch.ret = -EINTR;
else if (vcpu->arch.vpa.update_pending ||
vcpu->arch.slb_shadow.update_pending ||
vcpu->arch.dtl.update_pending)
vcpu->arch.ret = RESUME_GUEST;
else
continue;
kvmppc_remove_runnable(vc, vcpu, mftb());
wake_up(&vcpu->arch.cpu_run);
}
}
static void collect_piggybacks(struct core_info *cip, int target_threads)
{
struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
struct kvmppc_vcore *pvc, *vcnext;
spin_lock(&lp->lock);
list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
if (!spin_trylock(&pvc->lock))
continue;
prepare_threads(pvc);
if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) {
list_del_init(&pvc->preempt_list);
if (pvc->runner == NULL) {
pvc->vcore_state = VCORE_INACTIVE;
kvmppc_core_end_stolen(pvc, mftb());
}
spin_unlock(&pvc->lock);
continue;
}
if (!can_piggyback(pvc, cip, target_threads)) {
spin_unlock(&pvc->lock);
continue;
}
kvmppc_core_end_stolen(pvc, mftb());
pvc->vcore_state = VCORE_PIGGYBACK;
if (cip->total_threads >= target_threads)
break;
}
spin_unlock(&lp->lock);
}
static bool recheck_signals_and_mmu(struct core_info *cip)
{
int sub, i;
struct kvm_vcpu *vcpu;
struct kvmppc_vcore *vc;
for (sub = 0; sub < cip->n_subcores; ++sub) {
vc = cip->vc[sub];
if (!vc->kvm->arch.mmu_ready)
return true;
for_each_runnable_thread(i, vcpu, vc)
if (signal_pending(vcpu->arch.run_task))
return true;
}
return false;
}
static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
{
int still_running = 0, i;
u64 now;
long ret;
struct kvm_vcpu *vcpu;
spin_lock(&vc->lock);
now = get_tb();
for_each_runnable_thread(i, vcpu, vc) {
/*
* It's safe to unlock the vcore in the loop here, because
* for_each_runnable_thread() is safe against removal of
* the vcpu, and the vcore state is VCORE_EXITING here,
* so any vcpus becoming runnable will have their arch.trap
* set to zero and can't actually run in the guest.
*/
spin_unlock(&vc->lock);
/* cancel pending dec exception if dec is positive */
if (now < kvmppc_dec_expires_host_tb(vcpu) &&
kvmppc_core_pending_dec(vcpu))
kvmppc_core_dequeue_dec(vcpu);
trace_kvm_guest_exit(vcpu);
ret = RESUME_GUEST;
if (vcpu->arch.trap)
ret = kvmppc_handle_exit_hv(vcpu,
vcpu->arch.run_task);
vcpu->arch.ret = ret;
vcpu->arch.trap = 0;
spin_lock(&vc->lock);
if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
if (vcpu->arch.pending_exceptions)
kvmppc_core_prepare_to_enter(vcpu);
if (vcpu->arch.ceded)
kvmppc_set_timer(vcpu);
else
++still_running;
} else {
kvmppc_remove_runnable(vc, vcpu, mftb());
wake_up(&vcpu->arch.cpu_run);
}
}
if (!is_master) {
if (still_running > 0) {
kvmppc_vcore_preempt(vc);
} else if (vc->runner) {
vc->vcore_state = VCORE_PREEMPT;
kvmppc_core_start_stolen(vc, mftb());
} else {
vc->vcore_state = VCORE_INACTIVE;
}
if (vc->n_runnable > 0 && vc->runner == NULL) {
/* make sure there's a candidate runner awake */
i = -1;
vcpu = next_runnable_thread(vc, &i);
wake_up(&vcpu->arch.cpu_run);
}
}
spin_unlock(&vc->lock);
}
/*
* Clear core from the list of active host cores as we are about to
* enter the guest. Only do this if it is the primary thread of the
* core (not if a subcore) that is entering the guest.
*/
static inline int kvmppc_clear_host_core(unsigned int cpu)
{
int core;
if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
return 0;
/*
* Memory barrier can be omitted here as we will do a smp_wmb()
* later in kvmppc_start_thread and we need ensure that state is
* visible to other CPUs only after we enter guest.
*/
core = cpu >> threads_shift;
kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
return 0;
}
/*
* Advertise this core as an active host core since we exited the guest
* Only need to do this if it is the primary thread of the core that is
* exiting.
*/
static inline int kvmppc_set_host_core(unsigned int cpu)
{
int core;
if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
return 0;
/*
* Memory barrier can be omitted here because we do a spin_unlock
* immediately after this which provides the memory barrier.
*/
core = cpu >> threads_shift;
kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
return 0;
}
static void set_irq_happened(int trap)
{
switch (trap) {
case BOOK3S_INTERRUPT_EXTERNAL:
local_paca->irq_happened |= PACA_IRQ_EE;
break;
case BOOK3S_INTERRUPT_H_DOORBELL:
local_paca->irq_happened |= PACA_IRQ_DBELL;
break;
case BOOK3S_INTERRUPT_HMI:
local_paca->irq_happened |= PACA_IRQ_HMI;
break;
case BOOK3S_INTERRUPT_SYSTEM_RESET:
replay_system_reset();
break;
}
}
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
*/
static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu;
int i;
int srcu_idx;
struct core_info core_info;
struct kvmppc_vcore *pvc;
struct kvm_split_mode split_info, *sip;
int split, subcore_size, active;
int sub;
bool thr0_done;
unsigned long cmd_bit, stat_bit;
int pcpu, thr;
int target_threads;
int controlled_threads;
int trap;
bool is_power8;
if (WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)))
return;
/*
* Remove from the list any threads that have a signal pending
* or need a VPA update done
*/
prepare_threads(vc);
/* if the runner is no longer runnable, let the caller pick a new one */
if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
/*
* Initialize *vc.
*/
init_vcore_to_run(vc);
vc->preempt_tb = TB_NIL;
/*
* Number of threads that we will be controlling: the same as
* the number of threads per subcore, except on POWER9,
* where it's 1 because the threads are (mostly) independent.
*/
controlled_threads = threads_per_vcore(vc->kvm);
/*
* Make sure we are running on primary threads, and that secondary
* threads are offline. Also check if the number of threads in this
* guest are greater than the current system threads per guest.
*/
if ((controlled_threads > 1) &&
((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
for_each_runnable_thread(i, vcpu, vc) {
vcpu->arch.ret = -EBUSY;
kvmppc_remove_runnable(vc, vcpu, mftb());
wake_up(&vcpu->arch.cpu_run);
}
goto out;
}
/*
* See if we could run any other vcores on the physical core
* along with this one.
*/
init_core_info(&core_info, vc);
pcpu = smp_processor_id();
target_threads = controlled_threads;
if (target_smt_mode && target_smt_mode < target_threads)
target_threads = target_smt_mode;
if (vc->num_threads < target_threads)
collect_piggybacks(&core_info, target_threads);
/*
* Hard-disable interrupts, and check resched flag and signals.
* If we need to reschedule or deliver a signal, clean up
* and return without going into the guest(s).
* If the mmu_ready flag has been cleared, don't go into the
* guest because that means a HPT resize operation is in progress.
*/
local_irq_disable();
hard_irq_disable();
if (lazy_irq_pending() || need_resched() ||
recheck_signals_and_mmu(&core_info)) {
local_irq_enable();
vc->vcore_state = VCORE_INACTIVE;
/* Unlock all except the primary vcore */
for (sub = 1; sub < core_info.n_subcores; ++sub) {
pvc = core_info.vc[sub];
/* Put back on to the preempted vcores list */
kvmppc_vcore_preempt(pvc);
spin_unlock(&pvc->lock);
}
for (i = 0; i < controlled_threads; ++i)
kvmppc_release_hwthread(pcpu + i);
return;
}
kvmppc_clear_host_core(pcpu);
/* Decide on micro-threading (split-core) mode */
subcore_size = threads_per_subcore;
cmd_bit = stat_bit = 0;
split = core_info.n_subcores;
sip = NULL;
is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S);
if (split > 1) {
sip = &split_info;
memset(&split_info, 0, sizeof(split_info));
for (sub = 0; sub < core_info.n_subcores; ++sub)
split_info.vc[sub] = core_info.vc[sub];
if (is_power8) {
if (split == 2 && (dynamic_mt_modes & 2)) {
cmd_bit = HID0_POWER8_1TO2LPAR;
stat_bit = HID0_POWER8_2LPARMODE;
} else {
split = 4;
cmd_bit = HID0_POWER8_1TO4LPAR;
stat_bit = HID0_POWER8_4LPARMODE;
}
subcore_size = MAX_SMT_THREADS / split;
split_info.rpr = mfspr(SPRN_RPR);
split_info.pmmar = mfspr(SPRN_PMMAR);
split_info.ldbar = mfspr(SPRN_LDBAR);
split_info.subcore_size = subcore_size;
} else {
split_info.subcore_size = 1;
}
/* order writes to split_info before kvm_split_mode pointer */
smp_wmb();
}
for (thr = 0; thr < controlled_threads; ++thr) {
struct paca_struct *paca = paca_ptrs[pcpu + thr];
paca->kvm_hstate.napping = 0;
paca->kvm_hstate.kvm_split_mode = sip;
}
/* Initiate micro-threading (split-core) on POWER8 if required */
if (cmd_bit) {
unsigned long hid0 = mfspr(SPRN_HID0);
hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
mb();
mtspr(SPRN_HID0, hid0);
isync();
for (;;) {
hid0 = mfspr(SPRN_HID0);
if (hid0 & stat_bit)
break;
cpu_relax();
}
}
/*
* On POWER8, set RWMR register.
* Since it only affects PURR and SPURR, it doesn't affect
* the host, so we don't save/restore the host value.
*/
if (is_power8) {
unsigned long rwmr_val = RWMR_RPA_P8_8THREAD;
int n_online = atomic_read(&vc->online_count);
/*
* Use the 8-thread value if we're doing split-core
* or if the vcore's online count looks bogus.
*/
if (split == 1 && threads_per_subcore == MAX_SMT_THREADS &&
n_online >= 1 && n_online <= MAX_SMT_THREADS)
rwmr_val = p8_rwmr_values[n_online];
mtspr(SPRN_RWMR, rwmr_val);
}
/* Start all the threads */
active = 0;
for (sub = 0; sub < core_info.n_subcores; ++sub) {
thr = is_power8 ? subcore_thread_map[sub] : sub;
thr0_done = false;
active |= 1 << thr;
pvc = core_info.vc[sub];
pvc->pcpu = pcpu + thr;
for_each_runnable_thread(i, vcpu, pvc) {
/*
* XXX: is kvmppc_start_thread called too late here?
* It updates vcpu->cpu and vcpu->arch.thread_cpu
* which are used by kvmppc_fast_vcpu_kick_hv(), but
* kick is called after new exceptions become available
* and exceptions are checked earlier than here, by
* kvmppc_core_prepare_to_enter.
*/
kvmppc_start_thread(vcpu, pvc);
kvmppc_update_vpa_dispatch(vcpu, pvc);
trace_kvm_guest_enter(vcpu);
if (!vcpu->arch.ptid)
thr0_done = true;
active |= 1 << (thr + vcpu->arch.ptid);
}
/*
* We need to start the first thread of each subcore
* even if it doesn't have a vcpu.
*/
if (!thr0_done)
kvmppc_start_thread(NULL, pvc);
}
/*
* Ensure that split_info.do_nap is set after setting
* the vcore pointer in the PACA of the secondaries.
*/
smp_mb();
/*
* When doing micro-threading, poke the inactive threads as well.
* This gets them to the nap instruction after kvm_do_nap,
* which reduces the time taken to unsplit later.
*/
if (cmd_bit) {
split_info.do_nap = 1; /* ask secondaries to nap when done */
for (thr = 1; thr < threads_per_subcore; ++thr)
if (!(active & (1 << thr)))
kvmppc_ipi_thread(pcpu + thr);
}
vc->vcore_state = VCORE_RUNNING;
preempt_disable();
trace_kvmppc_run_core(vc, 0);
for (sub = 0; sub < core_info.n_subcores; ++sub)
spin_unlock(&core_info.vc[sub]->lock);
guest_timing_enter_irqoff();
srcu_idx = srcu_read_lock(&vc->kvm->srcu);
guest_state_enter_irqoff();
this_cpu_disable_ftrace();
trap = __kvmppc_vcore_entry();
this_cpu_enable_ftrace();
guest_state_exit_irqoff();
srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
set_irq_happened(trap);
spin_lock(&vc->lock);
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
vc->vcore_state = VCORE_EXITING;
/* wait for secondary threads to finish writing their state to memory */
kvmppc_wait_for_nap(controlled_threads);
/* Return to whole-core mode if we split the core earlier */
if (cmd_bit) {
unsigned long hid0 = mfspr(SPRN_HID0);
unsigned long loops = 0;
hid0 &= ~HID0_POWER8_DYNLPARDIS;
stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
mb();
mtspr(SPRN_HID0, hid0);
isync();
for (;;) {
hid0 = mfspr(SPRN_HID0);
if (!(hid0 & stat_bit))
break;
cpu_relax();
++loops;
}
split_info.do_nap = 0;
}
kvmppc_set_host_core(pcpu);
if (!vtime_accounting_enabled_this_cpu()) {
local_irq_enable();
/*
* Service IRQs here before guest_timing_exit_irqoff() so any
* ticks that occurred while running the guest are accounted to
* the guest. If vtime accounting is enabled, accounting uses
* TB rather than ticks, so it can be done without enabling
* interrupts here, which has the problem that it accounts
* interrupt processing overhead to the host.
*/
local_irq_disable();
}
guest_timing_exit_irqoff();
local_irq_enable();
/* Let secondaries go back to the offline loop */
for (i = 0; i < controlled_threads; ++i) {
kvmppc_release_hwthread(pcpu + i);
if (sip && sip->napped[i])
kvmppc_ipi_thread(pcpu + i);
}
spin_unlock(&vc->lock);
/* make sure updates to secondary vcpu structs are visible now */
smp_mb();
preempt_enable();
for (sub = 0; sub < core_info.n_subcores; ++sub) {
pvc = core_info.vc[sub];
post_guest_process(pvc, pvc == vc);
}
spin_lock(&vc->lock);
out:
vc->vcore_state = VCORE_INACTIVE;
trace_kvmppc_run_core(vc, 1);
}
static inline bool hcall_is_xics(unsigned long req)
{
return req == H_EOI || req == H_CPPR || req == H_IPI ||
req == H_IPOLL || req == H_XIRR || req == H_XIRR_X;
}
static void vcpu_vpa_increment_dispatch(struct kvm_vcpu *vcpu)
{
struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
if (lp) {
u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
lp->yield_count = cpu_to_be32(yield_count);
vcpu->arch.vpa.dirty = 1;
}
}
/* call our hypervisor to load up HV regs and go */
static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long host_psscr;
unsigned long msr;
struct hv_guest_state hvregs;
struct p9_host_os_sprs host_os_sprs;
s64 dec;
int trap;
msr = mfmsr();
save_p9_host_os_sprs(&host_os_sprs);
/*
* We need to save and restore the guest visible part of the
* psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor
* doesn't do this for us. Note only required if pseries since
* this is done in kvmhv_vcpu_entry_p9() below otherwise.
*/
host_psscr = mfspr(SPRN_PSSCR_PR);
kvmppc_msr_hard_disable_set_facilities(vcpu, msr);
if (lazy_irq_pending())
return 0;
if (unlikely(load_vcpu_state(vcpu, &host_os_sprs)))
msr = mfmsr(); /* TM restore can update msr */
if (vcpu->arch.psscr != host_psscr)
mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr);
kvmhv_save_hv_regs(vcpu, &hvregs);
hvregs.lpcr = lpcr;
hvregs.amor = ~0;
vcpu->arch.regs.msr = vcpu->arch.shregs.msr;
hvregs.version = HV_GUEST_STATE_VERSION;
if (vcpu->arch.nested) {
hvregs.lpid = vcpu->arch.nested->shadow_lpid;
hvregs.vcpu_token = vcpu->arch.nested_vcpu_id;
} else {
hvregs.lpid = vcpu->kvm->arch.lpid;
hvregs.vcpu_token = vcpu->vcpu_id;
}
hvregs.hdec_expiry = time_limit;
/*
* When setting DEC, we must always deal with irq_work_raise
* via NMI vs setting DEC. The problem occurs right as we
* switch into guest mode if a NMI hits and sets pending work
* and sets DEC, then that will apply to the guest and not
* bring us back to the host.
*
* irq_work_raise could check a flag (or possibly LPCR[HDICE]
* for example) and set HDEC to 1? That wouldn't solve the
* nested hv case which needs to abort the hcall or zero the
* time limit.
*
* XXX: Another day's problem.
*/
mtspr(SPRN_DEC, kvmppc_dec_expires_host_tb(vcpu) - *tb);
mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
switch_pmu_to_guest(vcpu, &host_os_sprs);
accumulate_time(vcpu, &vcpu->arch.in_guest);
trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs),
__pa(&vcpu->arch.regs));
accumulate_time(vcpu, &vcpu->arch.guest_exit);
kvmhv_restore_hv_return_state(vcpu, &hvregs);
switch_pmu_to_host(vcpu, &host_os_sprs);
vcpu->arch.shregs.msr = vcpu->arch.regs.msr;
vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR);
store_vcpu_state(vcpu);
dec = mfspr(SPRN_DEC);
if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */
dec = (s32) dec;
*tb = mftb();
vcpu->arch.dec_expires = dec + (*tb + vc->tb_offset);
timer_rearm_host_dec(*tb);
restore_p9_host_os_sprs(vcpu, &host_os_sprs);
if (vcpu->arch.psscr != host_psscr)
mtspr(SPRN_PSSCR_PR, host_psscr);
return trap;
}
/*
* Guest entry for POWER9 and later CPUs.
*/
static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr, u64 *tb)
{
struct kvm *kvm = vcpu->kvm;
struct kvm_nested_guest *nested = vcpu->arch.nested;
u64 next_timer;
int trap;
next_timer = timer_get_next_tb();
if (*tb >= next_timer)
return BOOK3S_INTERRUPT_HV_DECREMENTER;
if (next_timer < time_limit)
time_limit = next_timer;
else if (*tb >= time_limit) /* nested time limit */
return BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER;
vcpu->arch.ceded = 0;
vcpu_vpa_increment_dispatch(vcpu);
if (kvmhv_on_pseries()) {
trap = kvmhv_vcpu_entry_p9_nested(vcpu, time_limit, lpcr, tb);
/* H_CEDE has to be handled now, not later */
if (trap == BOOK3S_INTERRUPT_SYSCALL && !nested &&
kvmppc_get_gpr(vcpu, 3) == H_CEDE) {
kvmppc_cede(vcpu);
kvmppc_set_gpr(vcpu, 3, 0);
trap = 0;
}
} else if (nested) {
__this_cpu_write(cpu_in_guest, kvm);
trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb);
__this_cpu_write(cpu_in_guest, NULL);
} else {
kvmppc_xive_push_vcpu(vcpu);
__this_cpu_write(cpu_in_guest, kvm);
trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb);
__this_cpu_write(cpu_in_guest, NULL);
if (trap == BOOK3S_INTERRUPT_SYSCALL &&
!(vcpu->arch.shregs.msr & MSR_PR)) {
unsigned long req = kvmppc_get_gpr(vcpu, 3);
/*
* XIVE rearm and XICS hcalls must be handled
* before xive context is pulled (is this
* true?)
*/
if (req == H_CEDE) {
/* H_CEDE has to be handled now */
kvmppc_cede(vcpu);
if (!kvmppc_xive_rearm_escalation(vcpu)) {
/*
* Pending escalation so abort
* the cede.
*/
vcpu->arch.ceded = 0;
}
kvmppc_set_gpr(vcpu, 3, 0);
trap = 0;
} else if (req == H_ENTER_NESTED) {
/*
* L2 should not run with the L1
* context so rearm and pull it.
*/
if (!kvmppc_xive_rearm_escalation(vcpu)) {
/*
* Pending escalation so abort
* H_ENTER_NESTED.
*/
kvmppc_set_gpr(vcpu, 3, 0);
trap = 0;
}
} else if (hcall_is_xics(req)) {
int ret;
ret = kvmppc_xive_xics_hcall(vcpu, req);
if (ret != H_TOO_HARD) {
kvmppc_set_gpr(vcpu, 3, ret);
trap = 0;
}
}
}
kvmppc_xive_pull_vcpu(vcpu);
if (kvm_is_radix(kvm))
vcpu->arch.slb_max = 0;
}
vcpu_vpa_increment_dispatch(vcpu);
return trap;
}
/*
* Wait for some other vcpu thread to execute us, and
* wake us up when we need to handle something in the host.
*/
static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu, int wait_state)
{
DEFINE_WAIT(wait);
prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
spin_unlock(&vc->lock);
schedule();
spin_lock(&vc->lock);
}
finish_wait(&vcpu->arch.cpu_run, &wait);
}
static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
{
if (!halt_poll_ns_grow)
return;
vc->halt_poll_ns *= halt_poll_ns_grow;
if (vc->halt_poll_ns < halt_poll_ns_grow_start)
vc->halt_poll_ns = halt_poll_ns_grow_start;
}
static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
{
if (halt_poll_ns_shrink == 0)
vc->halt_poll_ns = 0;
else
vc->halt_poll_ns /= halt_poll_ns_shrink;
}
#ifdef CONFIG_KVM_XICS
static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
{
if (!xics_on_xive())
return false;
return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr <
vcpu->arch.xive_saved_state.cppr;
}
#else
static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
{
return false;
}
#endif /* CONFIG_KVM_XICS */
static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.pending_exceptions || vcpu->arch.prodded ||
kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu))
return true;
return false;
}
static bool kvmppc_vcpu_check_block(struct kvm_vcpu *vcpu)
{
if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu))
return true;
return false;
}
/*
* Check to see if any of the runnable vcpus on the vcore have pending
* exceptions or are no longer ceded
*/
static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu;
int i;
for_each_runnable_thread(i, vcpu, vc) {
if (kvmppc_vcpu_check_block(vcpu))
return 1;
}
return 0;
}
/*
* All the vcpus in this vcore are idle, so wait for a decrementer
* or external interrupt to one of the vcpus. vc->lock is held.
*/
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
ktime_t cur, start_poll, start_wait;
int do_sleep = 1;
u64 block_ns;
WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
/* Poll for pending exceptions and ceded state */
cur = start_poll = ktime_get();
if (vc->halt_poll_ns) {
ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
++vc->runner->stat.generic.halt_attempted_poll;
vc->vcore_state = VCORE_POLLING;
spin_unlock(&vc->lock);
do {
if (kvmppc_vcore_check_block(vc)) {
do_sleep = 0;
break;
}
cur = ktime_get();
} while (kvm_vcpu_can_poll(cur, stop));
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
if (!do_sleep) {
++vc->runner->stat.generic.halt_successful_poll;
goto out;
}
}
prepare_to_rcuwait(&vc->wait);
set_current_state(TASK_INTERRUPTIBLE);
if (kvmppc_vcore_check_block(vc)) {
finish_rcuwait(&vc->wait);
do_sleep = 0;
/* If we polled, count this as a successful poll */
if (vc->halt_poll_ns)
++vc->runner->stat.generic.halt_successful_poll;
goto out;
}
start_wait = ktime_get();
vc->vcore_state = VCORE_SLEEPING;
trace_kvmppc_vcore_blocked(vc->runner, 0);
spin_unlock(&vc->lock);
schedule();
finish_rcuwait(&vc->wait);
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
trace_kvmppc_vcore_blocked(vc->runner, 1);
++vc->runner->stat.halt_successful_wait;
cur = ktime_get();
out:
block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
/* Attribute wait time */
if (do_sleep) {
vc->runner->stat.generic.halt_wait_ns +=
ktime_to_ns(cur) - ktime_to_ns(start_wait);
KVM_STATS_LOG_HIST_UPDATE(
vc->runner->stat.generic.halt_wait_hist,
ktime_to_ns(cur) - ktime_to_ns(start_wait));
/* Attribute failed poll time */
if (vc->halt_poll_ns) {
vc->runner->stat.generic.halt_poll_fail_ns +=
ktime_to_ns(start_wait) -
ktime_to_ns(start_poll);
KVM_STATS_LOG_HIST_UPDATE(
vc->runner->stat.generic.halt_poll_fail_hist,
ktime_to_ns(start_wait) -
ktime_to_ns(start_poll));
}
} else {
/* Attribute successful poll time */
if (vc->halt_poll_ns) {
vc->runner->stat.generic.halt_poll_success_ns +=
ktime_to_ns(cur) -
ktime_to_ns(start_poll);
KVM_STATS_LOG_HIST_UPDATE(
vc->runner->stat.generic.halt_poll_success_hist,
ktime_to_ns(cur) - ktime_to_ns(start_poll));
}
}
/* Adjust poll time */
if (halt_poll_ns) {
if (block_ns <= vc->halt_poll_ns)
;
/* We slept and blocked for longer than the max halt time */
else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
shrink_halt_poll_ns(vc);
/* We slept and our poll time is too small */
else if (vc->halt_poll_ns < halt_poll_ns &&
block_ns < halt_poll_ns)
grow_halt_poll_ns(vc);
if (vc->halt_poll_ns > halt_poll_ns)
vc->halt_poll_ns = halt_poll_ns;
} else
vc->halt_poll_ns = 0;
trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
}
/*
* This never fails for a radix guest, as none of the operations it does
* for a radix guest can fail or have a way to report failure.
*/
static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
{
int r = 0;
struct kvm *kvm = vcpu->kvm;
mutex_lock(&kvm->arch.mmu_setup_lock);
if (!kvm->arch.mmu_ready) {
if (!kvm_is_radix(kvm))
r = kvmppc_hv_setup_htab_rma(vcpu);
if (!r) {
if (cpu_has_feature(CPU_FTR_ARCH_300))
kvmppc_setup_partition_table(kvm);
kvm->arch.mmu_ready = 1;
}
}
mutex_unlock(&kvm->arch.mmu_setup_lock);
return r;
}
static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int n_ceded, i, r;
struct kvmppc_vcore *vc;
struct kvm_vcpu *v;
trace_kvmppc_run_vcpu_enter(vcpu);
run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
kvmppc_update_vpas(vcpu);
/*
* Synchronize with other threads in this virtual core
*/
vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
vcpu->arch.ceded = 0;
vcpu->arch.run_task = current;
vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
vcpu->arch.busy_preempt = TB_NIL;
WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
++vc->n_runnable;
/*
* This happens the first time this is called for a vcpu.
* If the vcore is already running, we may be able to start
* this thread straight away and have it join in.
*/
if (!signal_pending(current)) {
if ((vc->vcore_state == VCORE_PIGGYBACK ||
vc->vcore_state == VCORE_RUNNING) &&
!VCORE_IS_EXITING(vc)) {
kvmppc_update_vpa_dispatch(vcpu, vc);
kvmppc_start_thread(vcpu, vc);
trace_kvm_guest_enter(vcpu);
} else if (vc->vcore_state == VCORE_SLEEPING) {
rcuwait_wake_up(&vc->wait);
}
}
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
!signal_pending(current)) {
/* See if the MMU is ready to go */
if (!vcpu->kvm->arch.mmu_ready) {
spin_unlock(&vc->lock);
r = kvmhv_setup_mmu(vcpu);
spin_lock(&vc->lock);
if (r) {
run->exit_reason = KVM_EXIT_FAIL_ENTRY;
run->fail_entry.
hardware_entry_failure_reason = 0;
vcpu->arch.ret = r;
break;
}
}
if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
kvmppc_vcore_end_preempt(vc);
if (vc->vcore_state != VCORE_INACTIVE) {
kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
continue;
}
for_each_runnable_thread(i, v, vc) {
kvmppc_core_prepare_to_enter(v);
if (signal_pending(v->arch.run_task)) {
kvmppc_remove_runnable(vc, v, mftb());
v->stat.signal_exits++;
v->run->exit_reason = KVM_EXIT_INTR;
v->arch.ret = -EINTR;
wake_up(&v->arch.cpu_run);
}
}
if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
break;
n_ceded = 0;
for_each_runnable_thread(i, v, vc) {
if (!kvmppc_vcpu_woken(v))
n_ceded += v->arch.ceded;
else
v->arch.ceded = 0;
}
vc->runner = vcpu;
if (n_ceded == vc->n_runnable) {
kvmppc_vcore_blocked(vc);
} else if (need_resched()) {
kvmppc_vcore_preempt(vc);
/* Let something else run */
cond_resched_lock(&vc->lock);
if (vc->vcore_state == VCORE_PREEMPT)
kvmppc_vcore_end_preempt(vc);
} else {
kvmppc_run_core(vc);
}
vc->runner = NULL;
}
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
(vc->vcore_state == VCORE_RUNNING ||
vc->vcore_state == VCORE_EXITING ||
vc->vcore_state == VCORE_PIGGYBACK))
kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
kvmppc_vcore_end_preempt(vc);
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
kvmppc_remove_runnable(vc, vcpu, mftb());
vcpu->stat.signal_exits++;
run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
}
if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
/* Wake up some vcpu to run the core */
i = -1;
v = next_runnable_thread(vc, &i);
wake_up(&v->arch.cpu_run);
}
trace_kvmppc_run_vcpu_exit(vcpu);
spin_unlock(&vc->lock);
return vcpu->arch.ret;
}
int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
struct kvm_run *run = vcpu->run;
int trap, r, pcpu;
int srcu_idx;
struct kvmppc_vcore *vc;
struct kvm *kvm = vcpu->kvm;
struct kvm_nested_guest *nested = vcpu->arch.nested;
unsigned long flags;
u64 tb;
trace_kvmppc_run_vcpu_enter(vcpu);
run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
vc = vcpu->arch.vcore;
vcpu->arch.ceded = 0;
vcpu->arch.run_task = current;
vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
/* See if the MMU is ready to go */
if (unlikely(!kvm->arch.mmu_ready)) {
r = kvmhv_setup_mmu(vcpu);
if (r) {
run->exit_reason = KVM_EXIT_FAIL_ENTRY;
run->fail_entry.hardware_entry_failure_reason = 0;
vcpu->arch.ret = r;
return r;
}
}
if (need_resched())
cond_resched();
kvmppc_update_vpas(vcpu);
preempt_disable();
pcpu = smp_processor_id();
if (kvm_is_radix(kvm))
kvmppc_prepare_radix_vcpu(vcpu, pcpu);
/* flags save not required, but irq_pmu has no disable/enable API */
powerpc_local_irq_pmu_save(flags);
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
if (signal_pending(current))
goto sigpend;
if (need_resched() || !kvm->arch.mmu_ready)
goto out;
vcpu->cpu = pcpu;
vcpu->arch.thread_cpu = pcpu;
vc->pcpu = pcpu;
local_paca->kvm_hstate.kvm_vcpu = vcpu;
local_paca->kvm_hstate.ptid = 0;
local_paca->kvm_hstate.fake_suspend = 0;
/*
* Orders set cpu/thread_cpu vs testing for pending interrupts and
* doorbells below. The other side is when these fields are set vs
* kvmppc_fast_vcpu_kick_hv reading the cpu/thread_cpu fields to
* kick a vCPU to notice the pending interrupt.
*/
smp_mb();
if (!nested) {
kvmppc_core_prepare_to_enter(vcpu);
if (vcpu->arch.shregs.msr & MSR_EE) {
if (xive_interrupt_pending(vcpu))
kvmppc_inject_interrupt_hv(vcpu,
BOOK3S_INTERRUPT_EXTERNAL, 0);
} else if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
&vcpu->arch.pending_exceptions)) {
lpcr |= LPCR_MER;
}
} else if (vcpu->arch.pending_exceptions ||
vcpu->arch.doorbell_request ||
xive_interrupt_pending(vcpu)) {
vcpu->arch.ret = RESUME_HOST;
goto out;
}
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
tb = mftb();
kvmppc_update_vpa_dispatch_p9(vcpu, vc, tb + vc->tb_offset);
trace_kvm_guest_enter(vcpu);
guest_timing_enter_irqoff();
srcu_idx = srcu_read_lock(&kvm->srcu);
guest_state_enter_irqoff();
this_cpu_disable_ftrace();
trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr, &tb);
vcpu->arch.trap = trap;
this_cpu_enable_ftrace();
guest_state_exit_irqoff();
srcu_read_unlock(&kvm->srcu, srcu_idx);
set_irq_happened(trap);
vcpu->cpu = -1;
vcpu->arch.thread_cpu = -1;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
if (!vtime_accounting_enabled_this_cpu()) {
powerpc_local_irq_pmu_restore(flags);
/*
* Service IRQs here before guest_timing_exit_irqoff() so any
* ticks that occurred while running the guest are accounted to
* the guest. If vtime accounting is enabled, accounting uses
* TB rather than ticks, so it can be done without enabling
* interrupts here, which has the problem that it accounts
* interrupt processing overhead to the host.
*/
powerpc_local_irq_pmu_save(flags);
}
guest_timing_exit_irqoff();
powerpc_local_irq_pmu_restore(flags);
preempt_enable();
/*
* cancel pending decrementer exception if DEC is now positive, or if
* entering a nested guest in which case the decrementer is now owned
* by L2 and the L1 decrementer is provided in hdec_expires
*/
if (kvmppc_core_pending_dec(vcpu) &&
((tb < kvmppc_dec_expires_host_tb(vcpu)) ||
(trap == BOOK3S_INTERRUPT_SYSCALL &&
kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED)))
kvmppc_core_dequeue_dec(vcpu);
trace_kvm_guest_exit(vcpu);
r = RESUME_GUEST;
if (trap) {
if (!nested)
r = kvmppc_handle_exit_hv(vcpu, current);
else
r = kvmppc_handle_nested_exit(vcpu);
}
vcpu->arch.ret = r;
if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) {
kvmppc_set_timer(vcpu);
prepare_to_rcuwait(wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (signal_pending(current)) {
vcpu->stat.signal_exits++;
run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
break;
}
if (kvmppc_vcpu_check_block(vcpu))
break;
trace_kvmppc_vcore_blocked(vcpu, 0);
schedule();
trace_kvmppc_vcore_blocked(vcpu, 1);
}
finish_rcuwait(wait);
}
vcpu->arch.ceded = 0;
done:
trace_kvmppc_run_vcpu_exit(vcpu);
return vcpu->arch.ret;
sigpend:
vcpu->stat.signal_exits++;
run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
out:
vcpu->cpu = -1;
vcpu->arch.thread_cpu = -1;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
powerpc_local_irq_pmu_restore(flags);
preempt_enable();
goto done;
}
static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int r;
int srcu_idx;
struct kvm *kvm;
unsigned long msr;
start_timing(vcpu, &vcpu->arch.vcpu_entry);
if (!vcpu->arch.sane) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return -EINVAL;
}
/* No need to go into the guest when all we'll do is come back out */
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/*
* Don't allow entry with a suspended transaction, because
* the guest entry/exit code will lose it.
*/
if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
(current->thread.regs->msr & MSR_TM)) {
if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
run->exit_reason = KVM_EXIT_FAIL_ENTRY;
run->fail_entry.hardware_entry_failure_reason = 0;
return -EINVAL;
}
}
#endif
/*
* Force online to 1 for the sake of old userspace which doesn't
* set it.
*/
if (!vcpu->arch.online) {
atomic_inc(&vcpu->arch.vcore->online_count);
vcpu->arch.online = 1;
}
kvmppc_core_prepare_to_enter(vcpu);
kvm = vcpu->kvm;
atomic_inc(&kvm->arch.vcpus_running);
/* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */
smp_mb();
msr = 0;
if (IS_ENABLED(CONFIG_PPC_FPU))
msr |= MSR_FP;
if (cpu_has_feature(CPU_FTR_ALTIVEC))
msr |= MSR_VEC;
if (cpu_has_feature(CPU_FTR_VSX))
msr |= MSR_VSX;
if ((cpu_has_feature(CPU_FTR_TM) ||
cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) &&
(vcpu->arch.hfscr & HFSCR_TM))
msr |= MSR_TM;
msr = msr_check_and_set(msr);
kvmppc_save_user_regs();
kvmppc_save_current_sprs();
if (!cpu_has_feature(CPU_FTR_ARCH_300))
vcpu->arch.waitp = &vcpu->arch.vcore->wait;
vcpu->arch.pgdir = kvm->mm->pgd;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
do {
accumulate_time(vcpu, &vcpu->arch.guest_entry);
if (cpu_has_feature(CPU_FTR_ARCH_300))
r = kvmhv_run_single_vcpu(vcpu, ~(u64)0,
vcpu->arch.vcore->lpcr);
else
r = kvmppc_run_vcpu(vcpu);
if (run->exit_reason == KVM_EXIT_PAPR_HCALL) {
accumulate_time(vcpu, &vcpu->arch.hcall);
if (WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_PR)) {
/*
* These should have been caught reflected
* into the guest by now. Final sanity check:
* don't allow userspace to execute hcalls in
* the hypervisor.
*/
r = RESUME_GUEST;
continue;
}
trace_kvm_hcall_enter(vcpu);
r = kvmppc_pseries_do_hcall(vcpu);
trace_kvm_hcall_exit(vcpu, r);
kvmppc_core_prepare_to_enter(vcpu);
} else if (r == RESUME_PAGE_FAULT) {
accumulate_time(vcpu, &vcpu->arch.pg_fault);
srcu_idx = srcu_read_lock(&kvm->srcu);
r = kvmppc_book3s_hv_page_fault(vcpu,
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
srcu_read_unlock(&kvm->srcu, srcu_idx);
} else if (r == RESUME_PASSTHROUGH) {
if (WARN_ON(xics_on_xive()))
r = H_SUCCESS;
else
r = kvmppc_xics_rm_complete(vcpu, 0);
}
} while (is_kvmppc_resume_guest(r));
accumulate_time(vcpu, &vcpu->arch.vcpu_exit);
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
atomic_dec(&kvm->arch.vcpus_running);
srr_regs_clobbered();
end_timing(vcpu);
return r;
}
static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
int shift, int sllp)
{
(*sps)->page_shift = shift;
(*sps)->slb_enc = sllp;
(*sps)->enc[0].page_shift = shift;
(*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift);
/*
* Add 16MB MPSS support (may get filtered out by userspace)
*/
if (shift != 24) {
int penc = kvmppc_pgsize_lp_encoding(shift, 24);
if (penc != -1) {
(*sps)->enc[1].page_shift = 24;
(*sps)->enc[1].pte_enc = penc;
}
}
(*sps)++;
}
static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
struct kvm_ppc_smmu_info *info)
{
struct kvm_ppc_one_seg_page_size *sps;
/*
* POWER7, POWER8 and POWER9 all support 32 storage keys for data.
* POWER7 doesn't support keys for instruction accesses,
* POWER8 and POWER9 do.
*/
info->data_keys = 32;
info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0;
/* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */
info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS;
info->slb_size = 32;
/* We only support these sizes for now, and no muti-size segments */
sps = &info->sps[0];
kvmppc_add_seg_page_size(&sps, 12, 0);
kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
/* If running as a nested hypervisor, we don't support HPT guests */
if (kvmhv_on_pseries())
info->flags |= KVM_PPC_NO_HASH;
return 0;
}
/*
* Get (and clear) the dirty memory log for a memory slot.
*/
static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
struct kvm_dirty_log *log)
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
int r;
unsigned long n, i;
unsigned long *buf, *p;
struct kvm_vcpu *vcpu;
mutex_lock(&kvm->slots_lock);
r = -EINVAL;
if (log->slot >= KVM_USER_MEM_SLOTS)
goto out;
slots = kvm_memslots(kvm);
memslot = id_to_memslot(slots, log->slot);
r = -ENOENT;
if (!memslot || !memslot->dirty_bitmap)
goto out;
/*
* Use second half of bitmap area because both HPT and radix
* accumulate bits in the first half.
*/
n = kvm_dirty_bitmap_bytes(memslot);
buf = memslot->dirty_bitmap + n / sizeof(long);
memset(buf, 0, n);
if (kvm_is_radix(kvm))
r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
else
r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
if (r)
goto out;
/*
* We accumulate dirty bits in the first half of the
* memslot's dirty_bitmap area, for when pages are paged
* out or modified by the host directly. Pick up these
* bits and add them to the map.
*/
p = memslot->dirty_bitmap;
for (i = 0; i < n / sizeof(long); ++i)
buf[i] |= xchg(&p[i], 0);
/* Harvest dirty bits from VPA and DTL updates */
/* Note: we never modify the SLB shadow buffer areas */
kvm_for_each_vcpu(i, vcpu, kvm) {
spin_lock(&vcpu->arch.vpa_update_lock);
kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, buf, n))
goto out;
r = 0;
out:
mutex_unlock(&kvm->slots_lock);
return r;
}
static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot)
{
vfree(slot->arch.rmap);
slot->arch.rmap = NULL;
}
static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
const struct kvm_memory_slot *old,
struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
if (change == KVM_MR_CREATE) {
unsigned long size = array_size(new->npages, sizeof(*new->arch.rmap));
if ((size >> PAGE_SHIFT) > totalram_pages())
return -ENOMEM;
new->arch.rmap = vzalloc(size);
if (!new->arch.rmap)
return -ENOMEM;
} else if (change != KVM_MR_DELETE) {
new->arch.rmap = old->arch.rmap;
}
return 0;
}
static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
/*
* If we are creating or modifying a memslot, it might make
* some address that was previously cached as emulated
* MMIO be no longer emulated MMIO, so invalidate
* all the caches of emulated MMIO translations.
*/
if (change != KVM_MR_DELETE)
atomic64_inc(&kvm->arch.mmio_update);
/*
* For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels
* have already called kvm_arch_flush_shadow_memslot() to
* flush shadow mappings. For KVM_MR_CREATE we have no
* previous mappings. So the only case to handle is
* KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit
* has been changed.
* For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES
* to get rid of any THP PTEs in the partition-scoped page tables
* so we can track dirtiness at the page level; we flush when
* clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to
* using THP PTEs.
*/
if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) &&
((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES))
kvmppc_radix_flush_memslot(kvm, old);
/*
* If UV hasn't yet called H_SVM_INIT_START, don't register memslots.
*/
if (!kvm->arch.secure_guest)
return;
switch (change) {
case KVM_MR_CREATE:
/*
* @TODO kvmppc_uvmem_memslot_create() can fail and
* return error. Fix this.
*/
kvmppc_uvmem_memslot_create(kvm, new);
break;
case KVM_MR_DELETE:
kvmppc_uvmem_memslot_delete(kvm, old);
break;
default:
/* TODO: Handle KVM_MR_MOVE */
break;
}
}
/*
* Update LPCR values in kvm->arch and in vcores.
* Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion
* of kvm->arch.lpcr update).
*/
void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
{
long int i;
u32 cores_done = 0;
if ((kvm->arch.lpcr & mask) == lpcr)
return;
kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
for (i = 0; i < KVM_MAX_VCORES; ++i) {
struct kvmppc_vcore *vc = kvm->arch.vcores[i];
if (!vc)
continue;
spin_lock(&vc->lock);
vc->lpcr = (vc->lpcr & ~mask) | lpcr;
verify_lpcr(kvm, vc->lpcr);
spin_unlock(&vc->lock);
if (++cores_done >= kvm->arch.online_vcores)
break;
}
}
void kvmppc_setup_partition_table(struct kvm *kvm)
{
unsigned long dw0, dw1;
if (!kvm_is_radix(kvm)) {
/* PS field - page size for VRMA */
dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
/* HTABSIZE and HTABORG fields */
dw0 |= kvm->arch.sdr1;
/* Second dword as set by userspace */
dw1 = kvm->arch.process_table;
} else {
dw0 = PATB_HR | radix__get_tree_size() |
__pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
dw1 = PATB_GR | kvm->arch.process_table;
}
kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1);
}
/*
* Set up HPT (hashed page table) and RMA (real-mode area).
* Must be called with kvm->arch.mmu_setup_lock held.
*/
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
{
int err = 0;
struct kvm *kvm = vcpu->kvm;
unsigned long hva;
struct kvm_memory_slot *memslot;
struct vm_area_struct *vma;
unsigned long lpcr = 0, senc;
unsigned long psize, porder;
int srcu_idx;
/* Allocate hashed page table (if not done already) and reset it */
if (!kvm->arch.hpt.virt) {
int order = KVM_DEFAULT_HPT_ORDER;
struct kvm_hpt_info info;
err = kvmppc_allocate_hpt(&info, order);
/* If we get here, it means userspace didn't specify a
* size explicitly. So, try successively smaller
* sizes if the default failed. */
while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
err = kvmppc_allocate_hpt(&info, order);
if (err < 0) {
pr_err("KVM: Couldn't alloc HPT\n");
goto out;
}
kvmppc_set_hpt(kvm, &info);
}
/* Look up the memslot for guest physical address 0 */
srcu_idx = srcu_read_lock(&kvm->srcu);
memslot = gfn_to_memslot(kvm, 0);
/* We must have some memory at 0 by now */
err = -EINVAL;
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
goto out_srcu;
/* Look up the VMA for the start of this memory slot */
hva = memslot->userspace_addr;
mmap_read_lock(kvm->mm);
vma = vma_lookup(kvm->mm, hva);
if (!vma || (vma->vm_flags & VM_IO))
goto up_out;
psize = vma_kernel_pagesize(vma);
mmap_read_unlock(kvm->mm);
/* We can handle 4k, 64k or 16M pages in the VRMA */
if (psize >= 0x1000000)
psize = 0x1000000;
else if (psize >= 0x10000)
psize = 0x10000;
else
psize = 0x1000;
porder = __ilog2(psize);
senc = slb_pgsize_encoding(psize);
kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
/* Create HPTEs in the hash page table for the VRMA */
kvmppc_map_vrma(vcpu, memslot, porder);
/* Update VRMASD field in the LPCR */
if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
/* the -4 is to account for senc values starting at 0x10 */
lpcr = senc << (LPCR_VRMASD_SH - 4);
kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
}
/* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */
smp_wmb();
err = 0;
out_srcu:
srcu_read_unlock(&kvm->srcu, srcu_idx);
out:
return err;
up_out:
mmap_read_unlock(kvm->mm);
goto out_srcu;
}
/*
* Must be called with kvm->arch.mmu_setup_lock held and
* mmu_ready = 0 and no vcpus running.
*/
int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
{
unsigned long lpcr, lpcr_mask;
if (nesting_enabled(kvm))
kvmhv_release_all_nested(kvm);
kvmppc_rmap_reset(kvm);
kvm->arch.process_table = 0;
/* Mutual exclusion with kvm_unmap_gfn_range etc. */
spin_lock(&kvm->mmu_lock);
kvm->arch.radix = 0;
spin_unlock(&kvm->mmu_lock);
kvmppc_free_radix(kvm);
lpcr = LPCR_VPM1;
lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR;
if (cpu_has_feature(CPU_FTR_ARCH_31))
lpcr_mask |= LPCR_HAIL;
kvmppc_update_lpcr(kvm, lpcr, lpcr_mask);
return 0;
}
/*
* Must be called with kvm->arch.mmu_setup_lock held and
* mmu_ready = 0 and no vcpus running.
*/
int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
{
unsigned long lpcr, lpcr_mask;
int err;
err = kvmppc_init_vm_radix(kvm);
if (err)
return err;
kvmppc_rmap_reset(kvm);
/* Mutual exclusion with kvm_unmap_gfn_range etc. */
spin_lock(&kvm->mmu_lock);
kvm->arch.radix = 1;
spin_unlock(&kvm->mmu_lock);
kvmppc_free_hpt(&kvm->arch.hpt);
lpcr = LPCR_UPRT | LPCR_GTSE | LPCR_HR;
lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR;
if (cpu_has_feature(CPU_FTR_ARCH_31)) {
lpcr_mask |= LPCR_HAIL;
if (cpu_has_feature(CPU_FTR_HVMODE) &&
(kvm->arch.host_lpcr & LPCR_HAIL))
lpcr |= LPCR_HAIL;
}
kvmppc_update_lpcr(kvm, lpcr, lpcr_mask);
return 0;
}
#ifdef CONFIG_KVM_XICS
/*
* Allocate a per-core structure for managing state about which cores are
* running in the host versus the guest and for exchanging data between
* real mode KVM and CPU running in the host.
* This is only done for the first VM.
* The allocated structure stays even if all VMs have stopped.
* It is only freed when the kvm-hv module is unloaded.
* It's OK for this routine to fail, we just don't support host
* core operations like redirecting H_IPI wakeups.
*/
void kvmppc_alloc_host_rm_ops(void)
{
struct kvmppc_host_rm_ops *ops;
unsigned long l_ops;
int cpu, core;
int size;
if (cpu_has_feature(CPU_FTR_ARCH_300))
return;
/* Not the first time here ? */
if (kvmppc_host_rm_ops_hv != NULL)
return;
ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
if (!ops)
return;
size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
ops->rm_core = kzalloc(size, GFP_KERNEL);
if (!ops->rm_core) {
kfree(ops);
return;
}
cpus_read_lock();
for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
if (!cpu_online(cpu))
continue;
core = cpu >> threads_shift;
ops->rm_core[core].rm_state.in_host = 1;
}
ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
/*
* Make the contents of the kvmppc_host_rm_ops structure visible
* to other CPUs before we assign it to the global variable.
* Do an atomic assignment (no locks used here), but if someone
* beats us to it, just free our copy and return.
*/
smp_wmb();
l_ops = (unsigned long) ops;
if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
cpus_read_unlock();
kfree(ops->rm_core);
kfree(ops);
return;
}
cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
"ppc/kvm_book3s:prepare",
kvmppc_set_host_core,
kvmppc_clear_host_core);
cpus_read_unlock();
}
void kvmppc_free_host_rm_ops(void)
{
if (kvmppc_host_rm_ops_hv) {
cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
kfree(kvmppc_host_rm_ops_hv->rm_core);
kfree(kvmppc_host_rm_ops_hv);
kvmppc_host_rm_ops_hv = NULL;
}
}
#endif
static int kvmppc_core_init_vm_hv(struct kvm *kvm)
{
unsigned long lpcr, lpid;
int ret;
mutex_init(&kvm->arch.uvmem_lock);
INIT_LIST_HEAD(&kvm->arch.uvmem_pfns);
mutex_init(&kvm->arch.mmu_setup_lock);
/* Allocate the guest's logical partition ID */
lpid = kvmppc_alloc_lpid();
if ((long)lpid < 0)
return -ENOMEM;
kvm->arch.lpid = lpid;
kvmppc_alloc_host_rm_ops();
kvmhv_vm_nested_init(kvm);
/*
* Since we don't flush the TLB when tearing down a VM,
* and this lpid might have previously been used,
* make sure we flush on each core before running the new VM.
* On POWER9, the tlbie in mmu_partition_table_set_entry()
* does this flush for us.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300))
cpumask_setall(&kvm->arch.need_tlb_flush);
/* Start out with the default set of hcalls enabled */
memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
sizeof(kvm->arch.enabled_hcalls));
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
/* Init LPCR for virtual RMA mode */
if (cpu_has_feature(CPU_FTR_HVMODE)) {
kvm->arch.host_lpid = mfspr(SPRN_LPID);
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
lpcr &= LPCR_PECE | LPCR_LPES;
} else {
/*
* The L2 LPES mode will be set by the L0 according to whether
* or not it needs to take external interrupts in HV mode.
*/
lpcr = 0;
}
lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
LPCR_VPM0 | LPCR_VPM1;
kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
/* On POWER8 turn on online bit to enable PURR/SPURR */
if (cpu_has_feature(CPU_FTR_ARCH_207S))
lpcr |= LPCR_ONL;
/*
* On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
* Set HVICE bit to enable hypervisor virtualization interrupts.
* Set HEIC to prevent OS interrupts to go to hypervisor (should
* be unnecessary but better safe than sorry in case we re-enable
* EE in HV mode with this LPCR still set)
*/
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
lpcr &= ~LPCR_VPM0;
lpcr |= LPCR_HVICE | LPCR_HEIC;
/*
* If xive is enabled, we route 0x500 interrupts directly
* to the guest.
*/
if (xics_on_xive())
lpcr |= LPCR_LPES;
}
/*
* If the host uses radix, the guest starts out as radix.
*/
if (radix_enabled()) {
kvm->arch.radix = 1;
kvm->arch.mmu_ready = 1;
lpcr &= ~LPCR_VPM1;
lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
if (cpu_has_feature(CPU_FTR_HVMODE) &&
cpu_has_feature(CPU_FTR_ARCH_31) &&
(kvm->arch.host_lpcr & LPCR_HAIL))
lpcr |= LPCR_HAIL;
ret = kvmppc_init_vm_radix(kvm);
if (ret) {
kvmppc_free_lpid(kvm->arch.lpid);
return ret;
}
kvmppc_setup_partition_table(kvm);
}
verify_lpcr(kvm, lpcr);
kvm->arch.lpcr = lpcr;
/* Initialization for future HPT resizes */
kvm->arch.resize_hpt = NULL;
/*
* Work out how many sets the TLB has, for the use of
* the TLB invalidation loop in book3s_hv_rmhandlers.S.
*/
if (cpu_has_feature(CPU_FTR_ARCH_31)) {
/*
* P10 will flush all the congruence class with a single tlbiel
*/
kvm->arch.tlb_sets = 1;
} else if (radix_enabled())
kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
else if (cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
else if (cpu_has_feature(CPU_FTR_ARCH_207S))
kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
else
kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
/*
* Track that we now have a HV mode VM active. This blocks secondary
* CPU threads from coming online.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm_hv_vm_activated();
/*
* Initialize smt_mode depending on processor.
* POWER8 and earlier have to use "strict" threading, where
* all vCPUs in a vcore have to run on the same (sub)core,
* whereas on POWER9 the threads can each run a different
* guest.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.smt_mode = threads_per_subcore;
else
kvm->arch.smt_mode = 1;
kvm->arch.emul_smt_mode = 1;
return 0;
}
static int kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm)
{
kvmppc_mmu_debugfs_init(kvm);
if (radix_enabled())
kvmhv_radix_debugfs_init(kvm);
return 0;
}
static void kvmppc_free_vcores(struct kvm *kvm)
{
long int i;
for (i = 0; i < KVM_MAX_VCORES; ++i)
kfree(kvm->arch.vcores[i]);
kvm->arch.online_vcores = 0;
}
static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
{
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm_hv_vm_deactivated();
kvmppc_free_vcores(kvm);
if (kvm_is_radix(kvm))
kvmppc_free_radix(kvm);
else
kvmppc_free_hpt(&kvm->arch.hpt);
/* Perform global invalidation and return lpid to the pool */
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (nesting_enabled(kvm))
kvmhv_release_all_nested(kvm);
kvm->arch.process_table = 0;
if (kvm->arch.secure_guest)
uv_svm_terminate(kvm->arch.lpid);
kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
}
kvmppc_free_lpid(kvm->arch.lpid);
kvmppc_free_pimap(kvm);
}
/* We don't need to emulate any privileged instructions or dcbz */
static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
return EMULATE_FAIL;
}
static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
ulong spr_val)
{
return EMULATE_FAIL;
}
static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
ulong *spr_val)
{
return EMULATE_FAIL;
}
static int kvmppc_core_check_processor_compat_hv(void)
{
if (cpu_has_feature(CPU_FTR_HVMODE) &&
cpu_has_feature(CPU_FTR_ARCH_206))
return 0;
/* POWER9 in radix mode is capable of being a nested hypervisor. */
if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
return 0;
return -EIO;
}
#ifdef CONFIG_KVM_XICS
void kvmppc_free_pimap(struct kvm *kvm)
{
kfree(kvm->arch.pimap);
}
static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
{
return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
}
static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
{
struct irq_desc *desc;
struct kvmppc_irq_map *irq_map;
struct kvmppc_passthru_irqmap *pimap;
struct irq_chip *chip;
int i, rc = 0;
struct irq_data *host_data;
if (!kvm_irq_bypass)
return 1;
desc = irq_to_desc(host_irq);
if (!desc)
return -EIO;
mutex_lock(&kvm->lock);
pimap = kvm->arch.pimap;
if (pimap == NULL) {
/* First call, allocate structure to hold IRQ map */
pimap = kvmppc_alloc_pimap();
if (pimap == NULL) {
mutex_unlock(&kvm->lock);
return -ENOMEM;
}
kvm->arch.pimap = pimap;
}
/*
* For now, we only support interrupts for which the EOI operation
* is an OPAL call followed by a write to XIRR, since that's
* what our real-mode EOI code does, or a XIVE interrupt
*/
chip = irq_data_get_irq_chip(&desc->irq_data);
if (!chip || !is_pnv_opal_msi(chip)) {
pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
host_irq, guest_gsi);
mutex_unlock(&kvm->lock);
return -ENOENT;
}
/*
* See if we already have an entry for this guest IRQ number.
* If it's mapped to a hardware IRQ number, that's an error,
* otherwise re-use this entry.
*/
for (i = 0; i < pimap->n_mapped; i++) {
if (guest_gsi == pimap->mapped[i].v_hwirq) {
if (pimap->mapped[i].r_hwirq) {
mutex_unlock(&kvm->lock);
return -EINVAL;
}
break;
}
}
if (i == KVMPPC_PIRQ_MAPPED) {
mutex_unlock(&kvm->lock);
return -EAGAIN; /* table is full */
}
irq_map = &pimap->mapped[i];
irq_map->v_hwirq = guest_gsi;
irq_map->desc = desc;
/*
* Order the above two stores before the next to serialize with
* the KVM real mode handler.
*/
smp_wmb();
/*
* The 'host_irq' number is mapped in the PCI-MSI domain but
* the underlying calls, which will EOI the interrupt in real
* mode, need an HW IRQ number mapped in the XICS IRQ domain.
*/
host_data = irq_domain_get_irq_data(irq_get_default_host(), host_irq);
irq_map->r_hwirq = (unsigned int)irqd_to_hwirq(host_data);
if (i == pimap->n_mapped)
pimap->n_mapped++;
if (xics_on_xive())
rc = kvmppc_xive_set_mapped(kvm, guest_gsi, host_irq);
else
kvmppc_xics_set_mapped(kvm, guest_gsi, irq_map->r_hwirq);
if (rc)
irq_map->r_hwirq = 0;
mutex_unlock(&kvm->lock);
return 0;
}
static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
{
struct irq_desc *desc;
struct kvmppc_passthru_irqmap *pimap;
int i, rc = 0;
if (!kvm_irq_bypass)
return 0;
desc = irq_to_desc(host_irq);
if (!desc)
return -EIO;
mutex_lock(&kvm->lock);
if (!kvm->arch.pimap)
goto unlock;
pimap = kvm->arch.pimap;
for (i = 0; i < pimap->n_mapped; i++) {
if (guest_gsi == pimap->mapped[i].v_hwirq)
break;
}
if (i == pimap->n_mapped) {
mutex_unlock(&kvm->lock);
return -ENODEV;
}
if (xics_on_xive())
rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, host_irq);
else
kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
/* invalidate the entry (what to do on error from the above ?) */
pimap->mapped[i].r_hwirq = 0;
/*
* We don't free this structure even when the count goes to
* zero. The structure is freed when we destroy the VM.
*/
unlock:
mutex_unlock(&kvm->lock);
return rc;
}
static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
int ret = 0;
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
irqfd->producer = prod;
ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
if (ret)
pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
prod->irq, irqfd->gsi, ret);
return ret;
}
static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
int ret;
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
irqfd->producer = NULL;
/*
* When producer of consumer is unregistered, we change back to
* default external interrupt handling mode - KVM real mode
* will switch back to host.
*/
ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
if (ret)
pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
prod->irq, irqfd->gsi, ret);
}
#endif
static long kvm_arch_vm_ioctl_hv(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm __maybe_unused = filp->private_data;
void __user *argp = (void __user *)arg;
long r;
switch (ioctl) {
case KVM_PPC_ALLOCATE_HTAB: {
u32 htab_order;
/* If we're a nested hypervisor, we currently only support radix */
if (kvmhv_on_pseries()) {
r = -EOPNOTSUPP;
break;
}
r = -EFAULT;
if (get_user(htab_order, (u32 __user *)argp))
break;
r = kvmppc_alloc_reset_hpt(kvm, htab_order);
if (r)
break;
r = 0;
break;
}
case KVM_PPC_GET_HTAB_FD: {
struct kvm_get_htab_fd ghf;
r = -EFAULT;
if (copy_from_user(&ghf, argp, sizeof(ghf)))
break;
r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
break;
}
case KVM_PPC_RESIZE_HPT_PREPARE: {
struct kvm_ppc_resize_hpt rhpt;
r = -EFAULT;
if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
break;
r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
break;
}
case KVM_PPC_RESIZE_HPT_COMMIT: {
struct kvm_ppc_resize_hpt rhpt;
r = -EFAULT;
if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
break;
r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
break;
}
default:
r = -ENOTTY;
}
return r;
}
/*
* List of hcall numbers to enable by default.
* For compatibility with old userspace, we enable by default
* all hcalls that were implemented before the hcall-enabling
* facility was added. Note this list should not include H_RTAS.
*/
static unsigned int default_hcall_list[] = {
H_REMOVE,
H_ENTER,
H_READ,
H_PROTECT,
H_BULK_REMOVE,
#ifdef CONFIG_SPAPR_TCE_IOMMU
H_GET_TCE,
H_PUT_TCE,
#endif
H_SET_DABR,
H_SET_XDABR,
H_CEDE,
H_PROD,
H_CONFER,
H_REGISTER_VPA,
#ifdef CONFIG_KVM_XICS
H_EOI,
H_CPPR,
H_IPI,
H_IPOLL,
H_XIRR,
H_XIRR_X,
#endif
0
};
static void init_default_hcalls(void)
{
int i;
unsigned int hcall;
for (i = 0; default_hcall_list[i]; ++i) {
hcall = default_hcall_list[i];
WARN_ON(!kvmppc_hcall_impl_hv(hcall));
__set_bit(hcall / 4, default_enabled_hcalls);
}
}
static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
{
unsigned long lpcr;
int radix;
int err;
/* If not on a POWER9, reject it */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -ENODEV;
/* If any unknown flags set, reject it */
if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
return -EINVAL;
/* GR (guest radix) bit in process_table field must match */
radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
if (!!(cfg->process_table & PATB_GR) != radix)
return -EINVAL;
/* Process table size field must be reasonable, i.e. <= 24 */
if ((cfg->process_table & PRTS_MASK) > 24)
return -EINVAL;
/* We can change a guest to/from radix now, if the host is radix */
if (radix && !radix_enabled())
return -EINVAL;
/* If we're a nested hypervisor, we currently only support radix */
if (kvmhv_on_pseries() && !radix)
return -EINVAL;
mutex_lock(&kvm->arch.mmu_setup_lock);
if (radix != kvm_is_radix(kvm)) {
if (kvm->arch.mmu_ready) {
kvm->arch.mmu_ready = 0;
/* order mmu_ready vs. vcpus_running */
smp_mb();
if (atomic_read(&kvm->arch.vcpus_running)) {
kvm->arch.mmu_ready = 1;
err = -EBUSY;
goto out_unlock;
}
}
if (radix)
err = kvmppc_switch_mmu_to_radix(kvm);
else
err = kvmppc_switch_mmu_to_hpt(kvm);
if (err)
goto out_unlock;
}
kvm->arch.process_table = cfg->process_table;
kvmppc_setup_partition_table(kvm);
lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
err = 0;
out_unlock:
mutex_unlock(&kvm->arch.mmu_setup_lock);
return err;
}
static int kvmhv_enable_nested(struct kvm *kvm)
{
if (!nested)
return -EPERM;
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -ENODEV;
if (!radix_enabled())
return -ENODEV;
/* kvm == NULL means the caller is testing if the capability exists */
if (kvm)
kvm->arch.nested_enable = true;
return 0;
}
static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
int size)
{
int rc = -EINVAL;
if (kvmhv_vcpu_is_radix(vcpu)) {
rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size);
if (rc > 0)
rc = -EINVAL;
}
/* For now quadrants are the only way to access nested guest memory */
if (rc && vcpu->arch.nested)
rc = -EAGAIN;
return rc;
}
static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
int size)
{
int rc = -EINVAL;
if (kvmhv_vcpu_is_radix(vcpu)) {
rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size);
if (rc > 0)
rc = -EINVAL;
}
/* For now quadrants are the only way to access nested guest memory */
if (rc && vcpu->arch.nested)
rc = -EAGAIN;
return rc;
}
static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa)
{
unpin_vpa(kvm, vpa);
vpa->gpa = 0;
vpa->pinned_addr = NULL;
vpa->dirty = false;
vpa->update_pending = 0;
}
/*
* Enable a guest to become a secure VM, or test whether
* that could be enabled.
* Called when the KVM_CAP_PPC_SECURE_GUEST capability is
* tested (kvm == NULL) or enabled (kvm != NULL).
*/
static int kvmhv_enable_svm(struct kvm *kvm)
{
if (!kvmppc_uvmem_available())
return -EINVAL;
if (kvm)
kvm->arch.svm_enabled = 1;
return 0;
}
/*
* IOCTL handler to turn off secure mode of guest
*
* - Release all device pages
* - Issue ucall to terminate the guest on the UV side
* - Unpin the VPA pages.
* - Reinit the partition scoped page tables
*/
static int kvmhv_svm_off(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
int mmu_was_ready;
int srcu_idx;
int ret = 0;
unsigned long i;
if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
return ret;
mutex_lock(&kvm->arch.mmu_setup_lock);
mmu_was_ready = kvm->arch.mmu_ready;
if (kvm->arch.mmu_ready) {
kvm->arch.mmu_ready = 0;
/* order mmu_ready vs. vcpus_running */
smp_mb();
if (atomic_read(&kvm->arch.vcpus_running)) {
kvm->arch.mmu_ready = 1;
ret = -EBUSY;
goto out;
}
}
srcu_idx = srcu_read_lock(&kvm->srcu);
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
struct kvm_memory_slot *memslot;
struct kvm_memslots *slots = __kvm_memslots(kvm, i);
int bkt;
if (!slots)
continue;
kvm_for_each_memslot(memslot, bkt, slots) {
kvmppc_uvmem_drop_pages(memslot, kvm, true);
uv_unregister_mem_slot(kvm->arch.lpid, memslot->id);
}
}
srcu_read_unlock(&kvm->srcu, srcu_idx);
ret = uv_svm_terminate(kvm->arch.lpid);
if (ret != U_SUCCESS) {
ret = -EINVAL;
goto out;
}
/*
* When secure guest is reset, all the guest pages are sent
* to UV via UV_PAGE_IN before the non-boot vcpus get a
* chance to run and unpin their VPA pages. Unpinning of all
* VPA pages is done here explicitly so that VPA pages
* can be migrated to the secure side.
*
* This is required to for the secure SMP guest to reboot
* correctly.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
spin_lock(&vcpu->arch.vpa_update_lock);
unpin_vpa_reset(kvm, &vcpu->arch.dtl);
unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow);
unpin_vpa_reset(kvm, &vcpu->arch.vpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
kvmppc_setup_partition_table(kvm);
kvm->arch.secure_guest = 0;
kvm->arch.mmu_ready = mmu_was_ready;
out:
mutex_unlock(&kvm->arch.mmu_setup_lock);
return ret;
}
static int kvmhv_enable_dawr1(struct kvm *kvm)
{
if (!cpu_has_feature(CPU_FTR_DAWR1))
return -ENODEV;
/* kvm == NULL means the caller is testing if the capability exists */
if (kvm)
kvm->arch.dawr1_enabled = true;
return 0;
}
static bool kvmppc_hash_v3_possible(void)
{
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return false;
if (!cpu_has_feature(CPU_FTR_HVMODE))
return false;
/*
* POWER9 chips before version 2.02 can't have some threads in
* HPT mode and some in radix mode on the same core.
*/
if (radix_enabled()) {
unsigned int pvr = mfspr(SPRN_PVR);
if ((pvr >> 16) == PVR_POWER9 &&
(((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) ||
((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101)))
return false;
}
return true;
}
static struct kvmppc_ops kvm_ops_hv = {
.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
.get_one_reg = kvmppc_get_one_reg_hv,
.set_one_reg = kvmppc_set_one_reg_hv,
.vcpu_load = kvmppc_core_vcpu_load_hv,
.vcpu_put = kvmppc_core_vcpu_put_hv,
.inject_interrupt = kvmppc_inject_interrupt_hv,
.set_msr = kvmppc_set_msr_hv,
.vcpu_run = kvmppc_vcpu_run_hv,
.vcpu_create = kvmppc_core_vcpu_create_hv,
.vcpu_free = kvmppc_core_vcpu_free_hv,
.check_requests = kvmppc_core_check_requests_hv,
.get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
.flush_memslot = kvmppc_core_flush_memslot_hv,
.prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
.commit_memory_region = kvmppc_core_commit_memory_region_hv,
.unmap_gfn_range = kvm_unmap_gfn_range_hv,
.age_gfn = kvm_age_gfn_hv,
.test_age_gfn = kvm_test_age_gfn_hv,
.set_spte_gfn = kvm_set_spte_gfn_hv,
.free_memslot = kvmppc_core_free_memslot_hv,
.init_vm = kvmppc_core_init_vm_hv,
.destroy_vm = kvmppc_core_destroy_vm_hv,
.get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
.emulate_op = kvmppc_core_emulate_op_hv,
.emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
.emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
.fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
.arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
.hcall_implemented = kvmppc_hcall_impl_hv,
#ifdef CONFIG_KVM_XICS
.irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
.irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
#endif
.configure_mmu = kvmhv_configure_mmu,
.get_rmmu_info = kvmhv_get_rmmu_info,
.set_smt_mode = kvmhv_set_smt_mode,
.enable_nested = kvmhv_enable_nested,
.load_from_eaddr = kvmhv_load_from_eaddr,
.store_to_eaddr = kvmhv_store_to_eaddr,
.enable_svm = kvmhv_enable_svm,
.svm_off = kvmhv_svm_off,
.enable_dawr1 = kvmhv_enable_dawr1,
.hash_v3_possible = kvmppc_hash_v3_possible,
.create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv,
.create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv,
};
static int kvm_init_subcore_bitmap(void)
{
int i, j;
int nr_cores = cpu_nr_cores();
struct sibling_subcore_state *sibling_subcore_state;
for (i = 0; i < nr_cores; i++) {
int first_cpu = i * threads_per_core;
int node = cpu_to_node(first_cpu);
/* Ignore if it is already allocated. */
if (paca_ptrs[first_cpu]->sibling_subcore_state)
continue;
sibling_subcore_state =
kzalloc_node(sizeof(struct sibling_subcore_state),
GFP_KERNEL, node);
if (!sibling_subcore_state)
return -ENOMEM;
for (j = 0; j < threads_per_core; j++) {
int cpu = first_cpu + j;
paca_ptrs[cpu]->sibling_subcore_state =
sibling_subcore_state;
}
}
return 0;
}
static int kvmppc_radix_possible(void)
{
return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
}
static int kvmppc_book3s_init_hv(void)
{
int r;
if (!tlbie_capable) {
pr_err("KVM-HV: Host does not support TLBIE\n");
return -ENODEV;
}
/*
* FIXME!! Do we need to check on all cpus ?
*/
r = kvmppc_core_check_processor_compat_hv();
if (r < 0)
return -ENODEV;
r = kvmhv_nested_init();
if (r)
return r;
if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
r = kvm_init_subcore_bitmap();
if (r)
goto err;
}
/*
* We need a way of accessing the XICS interrupt controller,
* either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or
* indirectly, via OPAL.
*/
#ifdef CONFIG_SMP
if (!xics_on_xive() && !kvmhv_on_pseries() &&
!local_paca->kvm_hstate.xics_phys) {
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
if (!np) {
pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
r = -ENODEV;
goto err;
}
/* presence of intc confirmed - node can be dropped again */
of_node_put(np);
}
#endif
init_default_hcalls();
init_vcore_lists();
r = kvmppc_mmu_hv_init();
if (r)
goto err;
if (kvmppc_radix_possible()) {
r = kvmppc_radix_init();
if (r)
goto err;
}
r = kvmppc_uvmem_init();
if (r < 0) {
pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r);
return r;
}
kvm_ops_hv.owner = THIS_MODULE;
kvmppc_hv_ops = &kvm_ops_hv;
return 0;
err:
kvmhv_nested_exit();
kvmppc_radix_exit();
return r;
}
static void kvmppc_book3s_exit_hv(void)
{
kvmppc_uvmem_free();
kvmppc_free_host_rm_ops();
if (kvmppc_radix_possible())
kvmppc_radix_exit();
kvmppc_hv_ops = NULL;
kvmhv_nested_exit();
}
module_init(kvmppc_book3s_init_hv);
module_exit(kvmppc_book3s_exit_hv);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");