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

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of Gordan Bobic
> Sent: Monday, January 20, 2014 8:50 PM
> To: xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] vga passthrough with qemu-xen (or qemu upstream)
> 
> 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.

I think passing VGA card as a primary-in-domU works well in Qemu-traditional, 
right?

> 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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Thanks,
Feng

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