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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel