On 07/14/2014 02:43 PM, Andrew Lutomirski wrote:
>>
>> That patch is running through my build tests as we speak. I expect to
>> push it to tip:x86/urgent in about an hour.
>
> I think that espfix64 is completely broken on Xen, regardless of the
> pud vs pmd issue :( See:
>
> http://lkml.kernel.org/g/CALCETrWG-dQL8ipJ8cO3wfbYKA=mav3cs4-1jfwmbxf3pub...@mail.gmail.com
>
And it is also completely unclear to me if it is actually necessary.
Again, I would like to know how the Xen IRET pvop actually handles a
16-bit stack segment. If it restores all of RSP then espfix isn't
necessary.
-hpa
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