Messages in this thread Patch in this message | | | From | Vitaly Kuznetsov <> | Subject | [PATCH v2 05/30] KVM: x86: hyper-v: Honor HV_MSR_HYPERCALL_AVAILABLE privilege bit | Date | Fri, 21 May 2021 11:51:39 +0200 |
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HV_X64_MSR_GUEST_OS_ID/HV_X64_MSR_HYPERCALL are only available to guest when HV_MSR_HYPERCALL_AVAILABLE bit is exposed.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> --- arch/x86/kvm/hyperv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index b5bc16ea2595..13011803ebbd 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1196,6 +1196,18 @@ void kvm_hv_invalidate_tsc_page(struct kvm *kvm) static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr) { + if (!hv_vcpu->enforce_cpuid) + return true; + + switch (msr) { + case HV_X64_MSR_GUEST_OS_ID: + case HV_X64_MSR_HYPERCALL: + return hv_vcpu->cpuid_cache.features_eax & + HV_MSR_HYPERCALL_AVAILABLE; + default: + break; + } + return true; } -- 2.31.1
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