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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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bae0dfd74e
Currently, the SBI extension handle is expected to return Linux error code. The top SBI layer converts the Linux error code to SBI specific error code that can be returned to guest invoking the SBI calls. This model works as long as SBI error codes have 1-to-1 mappings between them. However, that may not be true always. This patch attempts to disassociate both these error codes by allowing the SBI extension implementation to return SBI specific error codes as well. The extension will continue to return the Linux error specific code which will indicate any problem *with* the extension emulation while the SBI specific error will indicate the problem *of* the emulation. Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Anup Patel <anup@brainfault.org>
98 lines
2.5 KiB
C
98 lines
2.5 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/sbi.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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struct kvm_vcpu_sbi_return *retdata)
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{
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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const struct kvm_vcpu_sbi_extension *sbi_ext;
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unsigned long *out_val = &retdata->out_val;
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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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retdata->uexit = true;
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} else {
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sbi_ext = kvm_vcpu_sbi_find_ext(cp->a0);
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*out_val = sbi_ext && sbi_ext->probe ?
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sbi_ext->probe(vcpu) : !!sbi_ext;
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}
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break;
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case SBI_EXT_BASE_GET_MVENDORID:
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*out_val = vcpu->arch.mvendorid;
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break;
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case SBI_EXT_BASE_GET_MARCHID:
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*out_val = vcpu->arch.marchid;
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break;
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case SBI_EXT_BASE_GET_MIMPID:
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*out_val = vcpu->arch.mimpid;
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break;
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default:
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retdata->err_val = SBI_ERR_NOT_SUPPORTED;
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break;
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}
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return 0;
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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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struct kvm_vcpu_sbi_return *retdata)
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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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retdata->uexit = 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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