[PATCH 25/30] KVM: x86: hyper-v: Honor HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED bit

[Vitaly Kuznetsov]

Hyper-V partition must possess 'HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED'
privilege ('recommended' is rather a misnomer) to issue
HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST/SPACE hypercalls.

Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
---
 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 36ec688cda4e..f99072e092d0 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2044,6 +2044,12 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv 
*hv_vcpu, u16 code)
                 */
                return !kvm_hv_is_syndbg_enabled(hv_vcpu->vcpu) ||
                        hv_vcpu->cpuid_cache.features_ebx & HV_DEBUGGING;
+       case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
+       case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
+       case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
+       case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
+               return hv_vcpu->cpuid_cache.enlightenments_eax &
+                       HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
        default:
                break;
        }
-- 
2.30.2