On Tue, Aug 02, 2011 at 08:34:32AM -0400, Avi Kivity wrote:
> On 08/02/2011 12:31 PM, Roedel, Joerg wrote:
> > On Sun, Jul 31, 2011 at 04:08:44AM -0400, Avi Kivity wrote:
> > > 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<[email protected]>
> > > >
> > > > Hmm, interesting. Sorry for breaking it. I tested the patch on nested
> > > > svm, it works fine.
> > >
> > > Does pae-on-pae work for you?
> >
> > Only tested pae-on-longmode. I'll see if I can find my 32bit
> > installation again and test this too.
>
> I wanted to test it since any mixup in where the PTPTRs were taken from
> would be readily apparent. But it crashes even without the patch.
Hmm, it worked when it was merged. I'll take a look at it.
Joerg
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