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

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Hyper-V partition must possess 'HV_POST_MESSAGES' privilege to issue
HVCALL_POST_MESSAGE hypercalls.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-23-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:56 +02:00 committed by Paolo Bonzini
parent 34ef7d7b9c
commit 4f532b7f96
1 changed files with 2 additions and 0 deletions
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arch/x86/kvm/hyperv.c
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@ -2099,6 +2099,8 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
return hv_vcpu->cpuid_cache.enlightenments_ebx &&
hv_vcpu->cpuid_cache.enlightenments_ebx != U32_MAX;
case HVCALL_POST_MESSAGE:
return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES;
default:
break;
}