KVM: x86: hyper-v: Honor HV_X64_CLUSTER_IPI_RECOMMENDED bit

Hyper-V partition must possess 'HV_X64_CLUSTER_IPI_RECOMMENDED'
privilege ('recommended' is rather a misnomer) to issue
HVCALL_SEND_IPI hypercalls.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-27-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 831279976d9f1a431600e44a89ff4ed4b53f54f5..eded585620a7afe09a081617e2fea94c513512f6 100644 (file)
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2118,6 +2118,10 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
        case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
                return hv_vcpu->cpuid_cache.enlightenments_eax &
                        HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
+       case HVCALL_SEND_IPI_EX:
+       case HVCALL_SEND_IPI:
+               return hv_vcpu->cpuid_cache.enlightenments_eax &
+                       HV_X64_CLUSTER_IPI_RECOMMENDED;
        default:
                break;
        }