Re: [PATCH] KVM: nVMX: Use cached exit reason

[Gleb Natapov <gleb@redhat.com>]

On Sun, Feb 24, 2013 at 02:11:34PM +0100, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> No need to re-read what vmx_vcpu_run already picked up for us.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Applied, thanks.

> ---
>  arch/x86/kvm/vmx.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index d45f0e0..ccb6456 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -6082,10 +6082,10 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
>   */
>  static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
>  {
> -	u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
>  	u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
>  	struct vcpu_vmx *vmx = to_vmx(vcpu);
>  	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
> +	u32 exit_reason = vmx->exit_reason;
>  
>  	if (vmx->nested.nested_run_pending)
>  		return 0;
> @@ -7364,7 +7364,7 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
>  
>  	/* update exit information fields: */
>  
> -	vmcs12->vm_exit_reason  = vmcs_read32(VM_EXIT_REASON);
> +	vmcs12->vm_exit_reason  = to_vmx(vcpu)->exit_reason;
Well, this can be called after migration, so vcpu->exit_reason will be
incorrect, but we all know how well migration works today with nested
guests.

>  	vmcs12->exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
>  
>  	vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
> -- 
> 1.7.3.4

--
			Gleb.