Re: [Xen-devel] [Qemu-devel] [PATCH 0/5] xen: add Intel IGD passthrough support

[Kevin O'Connor <kevin@xxxxxxxxxxxx>]

On Fri, Feb 21, 2014 at 02:44:08PM +0800, Yang Zhang wrote:
> From: Yang Zhang <yang.z.zhang@xxxxxxxxx>
> 
> The following patches are ported from Xen Qemu-traditional branch which are
> adding Intel IGD passthrough supporting to Qemu upstream.
> 
> To pass through IGD to guest, user need to add following lines in Xen config
> file:
> gfx_passthru=1
> pci=['00:02.0@2']
> 
> Besides, since Xen + Qemu upstream is requiring seabios, user also need to
> recompile seabios with CONFIG_OPTIONROMS_DEPLOYED=y to allow IGD pass through
> successfully:

I'm not familiar with the Xen parts of your patch series.  However, I
don't think one should be compiling SeaBIOS with
CONFIG_OPTIONROMS_DEPLOYED enabled.  That option was for very old
versions of Bochs and QEMU that did not support fetching of optionroms
directly from PCI config space nor from fw_cfg.

That compile time option is no longer well supported and it may be
removed in the future.  I suggest looking at getting one of the other
mechanisms working instead of using CONFIG_OPTIONROMS_DEPLOYED.

-Kevin

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