Re: [Xen-devel] regression from c/s 22071:c5aed2e049bc (ept: Put locks around ept_get_entry) ?

[Keir Fraser <keir@xxxxxxx>]

On 16/12/2010 17:03, "Keir Fraser" <keir@xxxxxxx> wrote:

> On 16/12/2010 16:50, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
>
>>> approach therefore. Perhaps *(volatile type *)px = x or, really, even better
>>> I should define some {read,write}_atomic{8,16,32,64} accessor functions
>>> which use inline asm to absolutely definitely emit a single atomic 'mov'
>>> instruction.
>>> 
>>> Make sense?
>> 
>> Yes.
> 
> Excellent. I will lay groundwork and fix pte_{read,write}_atomic directly in
> -unstable and -4.0-testing. I will then post a proposed fix for EPT to the
> list. I don't know that code so well and I may not otherwise catch all
> places that require use of the new accessor macros.

Attached is a patch I've knocked up for p2m-ept.c. I don't know how complete
it really is. Perhaps someone (George?) would like to Ack it as is, or
develop it further.

 -- Keir

>  -- Keir
> 
>> Jan
>> 
> 
>

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