Re: [PATCH 1/3] KVM: x86: Exit to user-mode on #UD intercept when emulator requires

[Paolo Bonzini <pbonzini@redhat.com>]

On 05/11/2017 15:21, Liran Alon wrote:
> From: Liran Alon <liran.alon@ravellosystems.com>
> 
> Signed-off-by: Liran Alon <liran.alon@oracle.com>
> Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  arch/x86/kvm/svm.c | 2 ++
>  arch/x86/kvm/vmx.c | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 0e68f0b3cbf7..e0162b20e3c9 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -2189,6 +2189,8 @@ static int ud_interception(struct vcpu_svm *svm)
>  	int er;
>  
>  	er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
> +	if (er == EMULATE_USER_EXIT)
> +		return 0;
>  	if (er != EMULATE_DONE)
>  		kvm_queue_exception(&svm->vcpu, UD_VECTOR);
>  	return 1;
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 95a01609d7ee..2b63d9edc207 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -5886,6 +5886,8 @@ static int handle_exception(struct kvm_vcpu *vcpu)
>  			return 1;
>  		}
>  		er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
> +		if (er == EMULATE_USER_EXIT)
> +			return 0;
>  		if (er != EMULATE_DONE)
>  			kvm_queue_exception(vcpu, UD_VECTOR);
>  		return 1;
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: stable@vger.kernel.org