Re: [Xen-devel] XSA-60 solutions

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.10.13 at 12:41, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote:
> Another point is, for shadow, currently Xen drop all shadows so that any new 
> ones would be created on demand with UC. It works safely for XSA-60, but 
> seems 
> not good enough. We can still use IA32_PAT to solve it, not touch shadow page 
> table itself.

Tim, any though on this?

> One thing I need more confirm from AMD side: iirc, AMD IOMMU always works 
> with snooped so cache cohernecy has been guaranteed, so no need do anything 
> for guest cr0.cd setting, no matter shadow or NPT, right? If yes, most code 
> could be done w/ Intel specific.

Iirc SVM allows the guest to run with CR0.CD set. Whether that's
entirely valid to do I'm not certain, but I suppose it's at least to some
degree due to the major inhibiting factor (hyperthreads) not existing
there.

Jan


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