KVM: x86: Don't attempt VMWare emulation on #GP with non-zero error code

[linux.git] / arch / x86 / kvm / vmx / vmx.c

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8f61250fc1c0a7d4e97730f084fe8a1572c709c0..d1bac3cb2440f662cad424bce9d6e46855b44d41 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4539,12 +4539,22 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
 
        if (!vmx->rmode.vm86_active && is_gp_fault(intr_info)) {
                WARN_ON_ONCE(!enable_vmware_backdoor);
+
+               /*
+                * VMware backdoor emulation on #GP interception only handles
+                * IN{S}, OUT{S}, and RDPMC, none of which generate a non-zero
+                * error code on #GP.
+                */
+               if (error_code) {
+                       kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
+                       return 1;
+               }
                er = kvm_emulate_instruction(vcpu,
                        EMULTYPE_VMWARE | EMULTYPE_NO_UD_ON_FAIL);
                if (er == EMULATE_USER_EXIT)
                        return 0;
                else if (er != EMULATE_DONE)
-                       kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
+                       kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
                return 1;
        }