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kvm: x86: Emulate IA32_XFD_ERR for guest

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Emulate read/write to IA32_XFD_ERR MSR.

Only the saved value in the guest_fpu container is touched in the
emulation handler. Actual MSR update is handled right before entering
the guest (with preemption disabled)

Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Zeng Guang <guang.zeng@intel.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220105123532.12586-14-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Liu 2022-01-05 04:35:24 -08:00 committed by Paolo Bonzini
parent ec5be88ab2
commit 548e83650a
1 changed files with 20 additions and 1 deletions
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21
arch/x86/kvm/x86.c
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@ -1377,7 +1377,7 @@ static const u32 msrs_to_save_all[] = {
MSR_F15H_PERF_CTL3, MSR_F15H_PERF_CTL4, MSR_F15H_PERF_CTL5,
MSR_F15H_PERF_CTR0, MSR_F15H_PERF_CTR1, MSR_F15H_PERF_CTR2,
MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5,
MSR_IA32_XFD,
MSR_IA32_XFD, MSR_IA32_XFD_ERR,
};
static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
@ -3699,6 +3699,17 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
fpu_update_guest_xfd(&vcpu->arch.guest_fpu, data);
break;
case MSR_IA32_XFD_ERR:
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_XFD))
return 1;
if (data & ~(XFEATURE_MASK_USER_DYNAMIC &
vcpu->arch.guest_supported_xcr0))
return 1;
vcpu->arch.guest_fpu.xfd_err = data;
break;
#endif
default:
if (kvm_pmu_is_valid_msr(vcpu, msr))
@ -4028,6 +4039,13 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = vcpu->arch.guest_fpu.fpstate->xfd;
break;
case MSR_IA32_XFD_ERR:
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_XFD))
return 1;
msr_info->data = vcpu->arch.guest_fpu.xfd_err;
break;
#endif
default:
if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
@ -6465,6 +6483,7 @@ static void kvm_init_msr_list(void)
continue;
break;
case MSR_IA32_XFD:
case MSR_IA32_XFD_ERR:
if (!kvm_cpu_cap_has(X86_FEATURE_XFD))
continue;
break;