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

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Keir,

Attached patch removes the shared option, and only supports separated
VT-d page table.

Randy (Weidong)

Keir Fraser wrote:
> On 22/4/08 16:43, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:
> 
>>> Then don't allow EPT 2MB mappings for domains which have passthru
>>> devices? 
>>> 
>> 
>> EPT 2M page is already supported while VT-d 2M not, so for we have to
>> seperate the 2 guys if we want to use 2M page in EPT.
>> and of course we share the page tables if both sides use 4K pages.
> 
> Just share the tables and put up with not having 2MB mappings
> available to you if a guest has devices passed through to it? Doesn't
> sound so bad to me, and you can get the performance back down the
> line by fixing the VT-d hardware to understand superpage mappings.
> We're going to end up with a silly number of p2m structures otherwise.
> 
>  -- Keir

Attachment: vtd-sep-2.patch
Description: vtd-sep-2.patch

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