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KVM: x86: hyper-v: Honor HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED bit

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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 <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-26-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:59 +02:00 • committed by Paolo Bonzini
parent a921cf83cc
commit bb53ecb4d6
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kvm/hyperv.c
View file

@ -2112,6 +2112,12 @@ 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;
}