Hyper-V partition must possess 'HV_SIGNAL_EVENTS' privilege to issue HVCALL_SIGNAL_EVENT hypercalls. Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> --- arch/x86/kvm/hyperv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index ff86c00d1396..523f63287636 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2033,6 +2033,8 @@ 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; } -- 2.31.1
