Re: [PATCH] VMX: Corrections to XSA-60 fix

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 07/11/13 11:09, Jan Beulich wrote:
>>>> On 07.11.13 at 11:56, Andrew Cooper <andrew.cooper3@citrix.com> wrote:
>> This patch is somewhat RFC, partly because I have only compile-tested it, and
>> because of a few further questions.
>>
>> 1) Are there any other places other than unmap_domain_page() we might want to
>>    put hooks? Any well behaved access should use {map,unmap}_domain_page() as
>>    far as I am aware.
> Any writes done through map_domain_page_global() mappings.
>
>> 2) What is expected to happen with Qemu mappings from dom0?  As far as I am
>>    aware, they can't retoactivly have their pagetable caching type changed.
> Right, so the flag should also get set when completing ioreq-s.
>
> Jan
>

And further questions.

* Can Intel confirm which platforms are incapable of using VT-d snooping?
* Can Intel confirm which platforms are missing vmx_pat?

It would be nice to have an idea of which systems are going to have
implicitly changed behaviour andor a performance cliff as a result of
these changes.

~Andrew