Re: [PATCH] KVM: MMU: Do not unconditionally read PDPTE from guest memory

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On 07/29/2011 02:31 PM, Roedel, Joerg wrote:
On Thu, Jul 28, 2011 at 04:36:17AM -0400, Avi Kivity wrote:
>  Architecturally, PDPTEs are cached in the PDPTRs when CR3 is reloaded.
>  On SVM, it is not possible to implement this, but on VMX this is possible
>  and was indeed implemented until nested SVM changed this to unconditionally
>  read PDPTEs dynamically.  This has noticable impact when running PAE guests.
>
>  Fix by changing the MMU to read PDPTRs from the cache, falling back to
>  reading from memory for the nested MMU.
>
>  Signed-off-by: Avi Kivity<avi@xxxxxxxxxx>

Hmm, interesting. Sorry for breaking it. I tested the patch on nested
svm, it works fine.

Does pae-on-pae work for you?

--
error compiling committee.c: too many arguments to function

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