Re: [Xen-devel] [PATCH] hvmloader: Intel GPU passthrough, reverse OpRegion

[Jean Guyader <jean.guyader@xxxxxxxxx>]

On 23 November 2011 17:20, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> On 23/11/2011 16:07, "Jean Guyader" <jean.guyader@xxxxxxxxxxxxx> wrote:
>
>>
>> The Intel GPU uses a two pages NVS region called OpRegion.
>> In order to get full support for the driver in the guest
>> we need to map this region.
>>
>> This patch reserves 2 pages on the top of the RAM and
>> mark this region as NVS in the e820. Then we write the
>> address to the config space (offset 0xfc) so the device
>> model can map the OpRegion at this address in the guest.
>
> Please use mem_hole_alloc() rather than adjusting {low,high}_mem_pgend.
>

Ok, that is handy.

> Is it correct to do this for *all* gfx devices with Intel vendor id?
>

The OpRegion is a Intel GPU specific thing.

Jean

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