[SeaBIOS] [PATCH 1/3] vgahooks: Allow usage of VGA hooks in the Xen case

Ian Campbell ijc at hellion.org.uk
Thu Feb 2 19:19:41 CET 2012

On Thu, 2012-02-02 at 13:28 +0000, Julian Pidancet wrote:
> On Wed, Feb 1, 2012 at 4:04 AM, Kevin O'Connor <kevin at koconnor.net> wrote:
> > On Mon, Jan 30, 2012 at 01:55:54PM +0000, julian.pidancet at gmail.com wrote:
> >> From: Julian Pidancet <julian.pidancet at citrix.com>
> >>
> >> This patch enables the VGAHOOKS config option if the BIOS is configured
> >> for Xen.
> >> In the Xen VGA passthrough case, the option ROM can be extracted from
> >> the physical device by hvmloader and pre-deployed for seabios. This
> >> patch also allows setting up VGA hooks in case the VGA option ROM is
> >> already deployed by hvmloader.
> >
> > This seems a bit odd - if option roms are deployed, how can seabios
> > reliably find the vga device?  Wouldn't it be simpler to just use
> > seabios in non-optionrom-deployed mode?  (After all, wouldn't seabios
> > still be able to pull the roms even if hvmloader alread did?)
> >
> I think you're right, I just checked the sources of hvmloader in
> xen-unstable, and it seems the option roms are only pre-deployed when
> using rombios instead of seabios.

That's correct. When Xen uses SeaBIOS we let it take care of the option

Ian Campbell

"All Bibles are man-made."
		-- Thomas Edison

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