[PATCH 23/30] KVM: x86: hyper-v: Honor HV_SIGNAL_EVENTS privilege bit

[Vitaly Kuznetsov]

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

Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
---
 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;
        }
-- 
2.30.2