Re: [Xen-devel] vga passthrough with qemu-xen (or qemu upstream)

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 2014-01-20 12:31, Shakeel Butt wrote:
> On Mon, Jan 20, 2014 at 4:09 AM, Stefano Stabellini
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> > On Mon, 20 Jan 2014, Wu, Feng wrote:
> > > > -----Original Message-----
> > > > From: xen-devel-bounces@xxxxxxxxxxxxx
> > > > [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of Shakeel Butt
> > > > Sent: Monday, January 20, 2014 1:48 PM
> > > > To: xen-devel@xxxxxxxxxxxxx
> > > > Subject: [Xen-devel] vga passthrough with qemu-xen (or qemu upstream)
> > > >
> > > > Hi all,
> > > >
> > > > Is it possible to do vga passthrough on xen-unstable with qemu-xen as
> > > > device model? I tried but I am getting error 'gfx_passthru' invalid
> > > > parameter for qemu-xen. I am able to do passthrough with qemu
> > > > traditional i.e. qemu-dm.
> > >
> > > As far as I know, only qemu-traditional supports vga pass-through 
> > > right now.
> > Right.
> > It is not possible to assign your primary VGA card to a VM with
> > qemu-xen. You should be able to assign your secondary VGA card though.
> Let me understand this correctly. If I have two VGA cards then I can
> passthrough
> secondary VGA card (in Dom0) to HVM as its primary VGA card. Is this 
> right and
> if yes how can I do it?
Passing any VGA card as a primary-in-domU has always been problematic.
Passing it as a secondary-in-domU generally works fine, though. Do you
have a specific requirement for the card to be primary in domU? It
doesn't actually gain you anything over and above seeing your domU
loading screen on the external monitor. Once the driver for the card
loads you get output as per normal.

Why do you need it to be primary in domU?

Gordan

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