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

Hyper-V partition must possess 'HV_SIGNAL_EVENTS' privilege to issue
HVCALL_SIGNAL_EVENT hypercalls.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-24-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:57 +02:00 committed by Paolo Bonzini
parent 4f532b7f96
commit a60b3c594e
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/hyperv.c
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@ -2101,6 +2101,8 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
hv_vcpu->cpuid_cache.enlightenments_ebx != U32_MAX;
case HVCALL_POST_MESSAGE:
return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES;
case HVCALL_SIGNAL_EVENT:
return hv_vcpu->cpuid_cache.features_ebx & HV_SIGNAL_EVENTS;
default:
break;
}