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RE: [Xen-devel] [PATCH] [VTD] Separate VT-d page table from P2M table

To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "Ian Pratt" <Ian.Pratt@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] [VTD] Separate VT-d page table from P2M table
From: "Han, Weidong" <weidong.han@xxxxxxxxx>
Date: Tue, 22 Apr 2008 20:31:58 +0800
Cc: "Xu, Anthony" <anthony.xu@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
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Thread-topic: [Xen-devel] [PATCH] [VTD] Separate VT-d page table from P2M table
Keir Fraser wrote:
> On 22/4/08 13:17, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote:
> 
>>> Are you saying that the VT-d 2MB page format is different from the
>>> EPT 2MB page format? Or that VTd does not support 2MB pages?
>>> 
>> 
>> Now VTd does not support 2MB pages.
> 
> Then don't allow EPT 2MB mappings for domains which have passthru
> devices? 
> 

No, EPT is 2MB, VT-d page table is 4KB.

Randy (Weidong)


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