RE: [Xen-devel] Windows SMP

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: James Harper
>Sent: Wednesday, December 31, 2008 4:22 PM
>> > James,
>> >
>> > Travis Betak released a Windows driver which patches Windows TPR
>> > accesses. You can find it from
>http://sourceforge.net/projects/amdvopt/.
>> > The code would be useful as a reference. src link:
>> >
>> > svn co https://amdvopt.svn.sourceforge.net/svnroot/amdvopt 
>amdvopt> 
>>
>> That looks like it could be a nice drop-in piece of code!
>> 
>
>He is taking a table-based approach, which would require ongoing
>maintenance. I was hoping to develop a more dynamic version, but given
>that someone else has already put the patch tables together, doing it
>dynamically suddenly seems like a lot of work :)
>
>Is there a similar approach that would work on an Intel system?

On Intel CPU with FlexPriority support, you don't need patching
guest since TPR accesses would be recognized  by hardware 
for acceleration automatically.

But on CPUs without h/w acceleration support, you may expect
borrow that overall idea, but instead of patching with LOCK MOV
CR0, you would replace it with a piece of code lines to emulate
similar acceleration as what h/w is assumed to do.

Thanks,
Kevin
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