Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v2)

[Mathieu Desnoyers]

* Jeremy Fitzhardinge (jeremy@xxxxxxxx) wrote:
> Ingo Molnar wrote:
>> * Ingo Molnar <mingo@xxxxxxx> wrote:
>>
>>   
>>> thanks Mathieu, i've picked this up into x86.git for more testing.
>>>     
>>
>> ... but had to drop it due to missing PARAVIRT support which broke the 
>> build. I guess on paravirt we could just initially define 
>> INTERRUPT_RETURN_NMI_SAFE to iret, etc.?
>
> I have not yet implemented Xen's support for paravirtual NMI, so there's no 
> scope for breaking anything from my perspective.  When I get around to NMI, 
> I'll work around whatever's there.  I don't know if lguest or VMI has any 
> guest NMI support.
>
>    J
>

I wonder if we could simply paravirtualize the popf instruction, which
seems to be the only one requiring to run in ring 0.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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