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.
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