Re: [libvirt] [RFC] Adding a "none" model for video cards
On 07/30/2014 03:51 AM, Jean-Baptiste Rouault wrote:
Hi,
I'm trying to run vexpress-a9 virtual machines (armv7l architecture) using
libvirt.
The vexpress-a9 doesn't support vga cards, but libvirt adds a video
"cirrus"
video card when there is a "graphics" element in the domain xml. This prevents
the domain from booting.
At the moment, the only workaround I found is to add the following to my xml
file :
<qemu:commandline>
<qemu:arg value='-vga'/>
<qemu:arg value='none'/>
</qemu:commandline>
What do you think about adding a "none" model type for video cards ? I know it
is a bit strange to declare a video card in order to have none...
I don't know the QEMU driver well, but maybe this could be handled by the
driver ? i.e. "no VGA card when the machine is vexpress-a9".
Not the first time we've had to do that (for example, we support 'none'
for the memballoon device, as well as for a <seclabel> tag when there is
no labeling to be done), all to maintain back-compat where the defaults
auto-populate devices. So your idea sounds reasonable on that front.
However, I also wonder if this is a case where our code for post-parse
touchups could be made smarter to not provide a cirrus default on
architectures that don't support it, so that you would get the correct
behavior without having to use an explicit none.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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