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RE: [Xen-devel] [PATCH 0/2] MTRR/PAT virtualization

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Su, Disheng" <disheng.su@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 0/2] MTRR/PAT virtualization
From: "Dong, Eddie" <eddie.dong@xxxxxxxxx>
Date: Tue, 9 Oct 2007 23:30:44 +0800
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Thread-topic: [Xen-devel] [PATCH 0/2] MTRR/PAT virtualization
Keir Fraser wrote:
 
>> BTW, if we don't remove those fixed 1:1 mapping, even without MTRR
>> patch, we may meet problem in future when there are complicated
>> drivers in domain0. E.g. high end graphics driver in domain0 may use
>> UC for its batch buffer, same for audio driver and other PCIe
>> drivers in future. Processor will see 2 different memory attribute
>> in its direct page table.
> 
> Yup. Jan Beulich posted a patch some time ago. At least some variant
> of that is certainly needed and I plan to put that in before 3.2.0.

So we can rely on you for this change, right? 
:-)

 
> If you need both then may as well enable both in the same
> patch. Just make
> it for pass-thru domains only, clean up the patch as I
> described before, and
> I'll be happy. Probably.
> 
Sure!

How about the initial MTRR value? Taking it easy, we can
do this when create a VCPU and leave future work to do in
Bochs BIOS. What is your opnion? in HVM loader from now?



thx,eddie

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