RE: [Xen-devel] [PATCH 1/2] graphics passthrough with VT-d

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

Stefano Stabellini wrote:
> On Fri, 28 Aug 2009, Jean Guyader wrote:
>> On Fri, Aug 28, 2009 at 03:54:05AM -0400, Han, Weidong wrote:
>>> This patch supports basic gfx passthrough on xen side:
>>>   - retrieves VGA bios from host VGA BIOS address (0xC0000), then
>>> load it to guest VGA BIOS address (This is the same with XCI). 
>>>   - Enlarge guest MMIO range to contain gfx card's large memory
>>>   - add a config option 'gfx_passthru' for gfx passthrough
>>> 
>>> Signed-off-by: Ben Lin <ben.y.lin@xxxxxxxxx>
>>> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
>> 
>> Hi,
>> 
>> First thanks for taking the time to upstream those patch that will
>> help a lot. 
>> 
>> I think the patch will be let intrusive if we could do all
>> that bios mapping + copying inside qemu so we don't need to
>> modify the xc_hvm_build function.
>> 
>> Qemu starts before the bios so that should be doable.
> 
> The problem with letting qemu do the mapping is that it is not going
> to work with stubdoms, while using a libxc function should work OK as
> long as it is called by xend, as in this case.

Currently stubdom doesn't support VT-d. So letting qemu do the mapping is much 
cleaner.

Regards,
Weidong
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