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KVM: x86: hyper-v: Honor HV_MSR_HYPERCALL_AVAILABLE privilege bit

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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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-6-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:39 +02:00 committed by Paolo Bonzini
parent b4128000e2
commit 1561c2cb87
1 changed files with 12 additions and 0 deletions
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12
arch/x86/kvm/hyperv.c
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@ -1205,6 +1205,18 @@ out_unlock:
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;
}