101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2021 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Atish Patra <atish.patra@wdc.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <linux/version.h>
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#include <asm/csr.h>
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#include <asm/sbi.h>
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#include <asm/kvm_vcpu_timer.h>
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#include <asm/kvm_vcpu_sbi.h>
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static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
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unsigned long *out_val,
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struct kvm_cpu_trap *trap, bool *exit)
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{
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int ret = 0;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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struct sbiret ecall_ret;
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switch (cp->a6) {
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case SBI_EXT_BASE_GET_SPEC_VERSION:
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*out_val = (KVM_SBI_VERSION_MAJOR <<
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SBI_SPEC_VERSION_MAJOR_SHIFT) |
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KVM_SBI_VERSION_MINOR;
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break;
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case SBI_EXT_BASE_GET_IMP_ID:
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*out_val = KVM_SBI_IMPID;
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break;
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case SBI_EXT_BASE_GET_IMP_VERSION:
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*out_val = LINUX_VERSION_CODE;
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break;
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case SBI_EXT_BASE_PROBE_EXT:
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if ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START &&
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cp->a0 <= SBI_EXT_EXPERIMENTAL_END) ||
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(cp->a0 >= SBI_EXT_VENDOR_START &&
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cp->a0 <= SBI_EXT_VENDOR_END)) {
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/*
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* For experimental/vendor extensions
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* forward it to the userspace
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*/
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kvm_riscv_vcpu_sbi_forward(vcpu, run);
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*exit = true;
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} else
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*out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
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break;
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case SBI_EXT_BASE_GET_MVENDORID:
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case SBI_EXT_BASE_GET_MARCHID:
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case SBI_EXT_BASE_GET_MIMPID:
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ecall_ret = sbi_ecall(SBI_EXT_BASE, cp->a6, 0, 0, 0, 0, 0, 0);
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if (!ecall_ret.error)
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*out_val = ecall_ret.value;
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/*TODO: We are unnecessarily converting the error twice */
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ret = sbi_err_map_linux_errno(ecall_ret.error);
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break;
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default:
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ret = -EOPNOTSUPP;
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break;
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}
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return ret;
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}
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = {
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.extid_start = SBI_EXT_BASE,
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.extid_end = SBI_EXT_BASE,
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.handler = kvm_sbi_ext_base_handler,
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};
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static int kvm_sbi_ext_forward_handler(struct kvm_vcpu *vcpu,
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struct kvm_run *run,
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unsigned long *out_val,
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struct kvm_cpu_trap *utrap,
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bool *exit)
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{
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/*
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* Both SBI experimental and vendor extensions are
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* unconditionally forwarded to userspace.
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*/
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kvm_riscv_vcpu_sbi_forward(vcpu, run);
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*exit = true;
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return 0;
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}
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = {
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.extid_start = SBI_EXT_EXPERIMENTAL_START,
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.extid_end = SBI_EXT_EXPERIMENTAL_END,
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.handler = kvm_sbi_ext_forward_handler,
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};
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = {
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.extid_start = SBI_EXT_VENDOR_START,
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.extid_end = SBI_EXT_VENDOR_END,
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.handler = kvm_sbi_ext_forward_handler,
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};
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