On Fri, Sep 16, 2016 at 03:20:16PM +0200, Pavel Hrdina wrote:
On Fri, Sep 16, 2016 at 03:06:18PM +0200, Andrea Bolognani wrote:
On Fri, 2016-09-16 at 14:43 +0200, Pavel Hrdina wrote:
> On Fri, Sep 16, 2016 at 09:30:23AM +0200, Laszlo Ersek wrote:
> > Most of QEMU's PCI display device models, such as:
> Pushed, thanks.

Ouch, you were too fast! ;)

There is something I wanted to clarify with Laszlo: is
virtio-gpu-pci ever going to be usable on other architectures
such as x86_64? Maybe it already is? Because if that's the
case, we'll want to be able to choose between virtio-vga and

One solution would be to keep mapping model='virtio' to
virtio-vga and create a new model='virtio-gpu' that maps to
virtio-gpu-pci, then forbid aarch64 mach-virt guests to use
model='virtio'. Or something like that, I'm not married to
the idea, I just think it's something we should definitely
think about before this ends up in a release.

I have some patches in my TODO branch that will rewrite the video
device code. virtio-gpu-pci is usable also on other architectures
but it lacks the VGA compatibility mode.  In libvirt all primary
video devices for x86 architecture have VGA mode.  Currently we
allow only QXL to be used as secondary video device and now with
the virtio-gpu-pci it could be also used as secondary video device.

The solution would be simple, there is no need to add a new video
model 'virtio-gpu', we will use the existing model 'virtio', but
depending on architecture and also whether it's primary or
secondary video device we will use appropriate device.
We already do this for QXL.

I'm not sure we're on the same track, so just to confirm I'll ask few
questions.  We guarantee that on x86_64 primary video devices have
always VGA compatibility mode?  So virtio-gpu-pci will *never* be able
to act as a primary video on x64?  If the answers are "yes, yes", then I
think this patch can stay as it is.  Unless I missed something else.


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