99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* ucall support. A ucall is a "hypercall to userspace".
|
||
|
|
*
|
||
|
|
* Copyright (C) 2021 Western Digital Corporation or its affiliates.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kvm.h>
|
||
|
|
|
||
|
|
#include "kvm_util.h"
|
||
|
|
#include "processor.h"
|
||
|
|
|
||
|
|
void ucall_init(struct kvm_vm *vm, void *arg)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
void ucall_uninit(struct kvm_vm *vm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
|
||
|
|
unsigned long arg1, unsigned long arg2,
|
||
|
|
unsigned long arg3, unsigned long arg4,
|
||
|
|
unsigned long arg5)
|
||
|
|
{
|
||
|
|
register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
|
||
|
|
register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
|
||
|
|
register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
|
||
|
|
register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
|
||
|
|
register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
|
||
|
|
register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
|
||
|
|
register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
|
||
|
|
register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
|
||
|
|
struct sbiret ret;
|
||
|
|
|
||
|
|
asm volatile (
|
||
|
|
"ecall"
|
||
|
|
: "+r" (a0), "+r" (a1)
|
||
|
|
: "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
|
||
|
|
: "memory");
|
||
|
|
ret.error = a0;
|
||
|
|
ret.value = a1;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ucall(uint64_t cmd, int nargs, ...)
|
||
|
|
{
|
||
|
|
struct ucall uc = {
|
||
|
|
.cmd = cmd,
|
||
|
|
};
|
||
|
|
va_list va;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
nargs = min(nargs, UCALL_MAX_ARGS);
|
||
|
|
|
||
|
|
va_start(va, nargs);
|
||
|
|
for (i = 0; i < nargs; ++i)
|
||
|
|
uc.args[i] = va_arg(va, uint64_t);
|
||
|
|
va_end(va);
|
||
|
|
|
||
|
|
sbi_ecall(KVM_RISCV_SELFTESTS_SBI_EXT,
|
||
|
|
KVM_RISCV_SELFTESTS_SBI_UCALL,
|
||
|
|
(vm_vaddr_t)&uc, 0, 0, 0, 0, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc)
|
||
|
|
{
|
||
|
|
struct kvm_run *run = vcpu->run;
|
||
|
|
struct ucall ucall = {};
|
||
|
|
|
||
|
|
if (uc)
|
||
|
|
memset(uc, 0, sizeof(*uc));
|
||
|
|
|
||
|
|
if (run->exit_reason == KVM_EXIT_RISCV_SBI &&
|
||
|
|
run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) {
|
||
|
|
switch (run->riscv_sbi.function_id) {
|
||
|
|
case KVM_RISCV_SELFTESTS_SBI_UCALL:
|
||
|
|
memcpy(&ucall,
|
||
|
|
addr_gva2hva(vcpu->vm, run->riscv_sbi.args[0]),
|
||
|
|
sizeof(ucall));
|
||
|
|
|
||
|
|
vcpu_run_complete_io(vcpu);
|
||
|
|
if (uc)
|
||
|
|
memcpy(uc, &ucall, sizeof(ucall));
|
||
|
|
|
||
|
|
break;
|
||
|
|
case KVM_RISCV_SELFTESTS_SBI_UNEXP:
|
||
|
|
vcpu_dump(stderr, vcpu, 2);
|
||
|
|
TEST_ASSERT(0, "Unexpected trap taken by guest");
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ucall.cmd;
|
||
|
|
}
|