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 | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 6e4bf1da9dcf..b661f92d90c8 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2120,6 +2120,12 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
kvm_vcpu_on_spin(vcpu, true);
break;
case HVCALL_SIGNAL_EVENT:
+ if (unlikely(!(hv_vcpu->cpuid_cache.features_ebx &
+ HV_SIGNAL_EVENTS))) {
+ ret = HV_STATUS_ACCESS_DENIED;
+ break;
+ }
+
if (unlikely(rep)) {
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
break;
--
2.30.2
