Re: [PATCH 0/12] KVM: SVM: Add support for VMCB state caching

Avi Kivity
2010-12-07T09:50:19Z

On 12/03/2010 12:45 PM, Joerg Roedel wrote:
> Hi Avi, Hi Marcelo,
>
> here is a patch-set which adds support for VMCB state caching to KVM.
> This is a new CPU feature where software can mark certain parts of the
> VMCB as unchanged since the last vmexit and the hardware can then avoid
> reloading these parts from memory.
>
> The feature is implemented downwards-compatible in hardware, so a 0-bit
> means the state has changed and needs to be reloaded. This makes it
> possible to implement the bits without checking for the feature, as done
> in this patch-set (another reason is that the check is as expensive as
> clearing the bit). Processors which do not implement VMCB state
> caching just ignore these bits.
>
> These patches were tested with multiple guests (Windows, Linux, also in
> parallel) and also with nested-svm.
>
> The patches apply on-top of the intercept mask wrapping patch-set I sent
> earlier this week. Your feedback is appreciated.
>

Applied, thanks.

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