[PATCH 22/30] KVM: x86: hyper-v: Honor HV_POST_MESSAGES privilege bit

[Vitaly Kuznetsov]

Hyper-V partition must possess 'HV_POST_MESSAGES' privilege to issue
HVCALL_POST_MESSAGE 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 bd424f2d4294..ff86c00d1396 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2031,6 +2031,8 @@ 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;
        }
-- 
2.30.2