On Tue, Mar 08, 2011 at 03:57:43PM +0200, Avi Kivity wrote:
> Move the exit reason checks to the front of the function, for early
> exit in the common case.
>
> Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
> ---
> arch/x86/kvm/vmx.c | 15 +++++++++------
> 1 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 6eadeaf..36fbe11 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -3879,17 +3879,20 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
>
> static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
> {
> - u32 exit_intr_info = vmx->exit_intr_info;
> + u32 exit_intr_info;
> +
> + if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY
> + || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
> + return;
> +
> + exit_intr_info = vmx->exit_intr_info;
So you're saving a vmread on exception and mce_during_vmentry exits?
Managing nmi_known_unmasked appears tricky... perhaps worthwhile to
have it in a helper that sets the bit in interruptibility info +
nmi_known_unmasked.
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