On 08/07/16 11:29 +0200, Michal Skrivanek wrote:

On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> wrote:


From: "Arman Khalatyan" <arm2arm@gmail.com>
To: "users" <users@ovirt.org>
Sent: Monday, July 4, 2016 11:52:24 AM
Subject: [ovirt-users] Is it possible to disable qxl video?


Hi,
I am doing PCI Passthrough for GPUs.
Is it possible somehow to disable/remove default video qxl?
thanks,
Arman,.
Hi,

The 4.0 Vdsm allows you to run a headless VM, meaning a VM without graphic device/frontend.
Not sure Engine allows you that however.

no it doesn’t

Even if engine allowed that, it may not be the correct solution.

Running headless with PCI passthrough is considered primary VGA
passthrough[1]. Using primary VGA passthrough without OVMF could cause
(will cause) quite a bit of headaches.

If you really want to try that, I assume using before_vm_start hook to
remove the video device should be enough.

[1] http://wiki.xenproject.org/wiki/Xen_VGA_Passthrough - it's
possible to read about primary and secondary passthrough between the
lines

However, if QXL is the problem (why is that so?) then you can switch to VGA(or CIRRUS if this is still 3.6)

I'm afraid you will need to write a Vdsm hook.

There could be simpler solutions depending on the Engine

Bests,

--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
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