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KVM: x86: hyper-v: Honor HV_DEBUGGING privilege bit

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Hyper-V partition must possess 'HV_DEBUGGING' privilege to issue
HVCALL_POST_DEBUG_DATA/HVCALL_RETRIEVE_DEBUG_DATA/
HVCALL_RESET_DEBUG_SESSION hypercalls.

Note, when SynDBG is disabled hv_check_hypercall_access() returns
'true' (like for any other unknown hypercall) so the result will
be HV_STATUS_INVALID_HYPERCALL_CODE and not HV_STATUS_ACCESS_DENIED.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-25-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:58 +02:00 committed by Paolo Bonzini
parent a60b3c594e
commit a921cf83cc
1 changed files with 9 additions and 0 deletions
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9
arch/x86/kvm/hyperv.c
View File

@ -2103,6 +2103,15 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES;
case HVCALL_SIGNAL_EVENT:
return hv_vcpu->cpuid_cache.features_ebx & HV_SIGNAL_EVENTS;
case HVCALL_POST_DEBUG_DATA:
case HVCALL_RETRIEVE_DEBUG_DATA:
case HVCALL_RESET_DEBUG_SESSION:
/*
* Return 'true' when SynDBG is disabled so the resulting code
* will be HV_STATUS_INVALID_HYPERCALL_CODE.
*/
return !kvm_hv_is_syndbg_enabled(hv_vcpu->vcpu) ||
hv_vcpu->cpuid_cache.features_ebx & HV_DEBUGGING;
default:
break;
}