[Spice-devel] [video-qxl 2/2] Default to only one head, not 4.

[Hans de Goede]

Hi,

On 01/21/2013 11:26 PM, Jeremy White wrote:
>>> Hmm.  I've been making sure that no change I make impacts the gtk spice
>>> client connecting to a qemu fedora 17 guest.  But I don't see that
>>> option there.  I'll see about using remote viewer instead.
>>>
>>> Did you see an actual problem using the patch, or is just clear to you
>>> that there will be one?
>>
>> The latter, with only 1 head, there will be no way to dynamically add
>> new displays (or so I expect).
>
> Can you hit me with a user clue bat so I can test this?

You not getting this to work is not your fault, but ours :)  It is a
pretty new feature lacking documentation.

First of all you will need Fedora-18 (preferably fully up2date with
all updates from updates-testing) as both host and guest!

Then you've all the necessary bits, but the new features are not
on by default, they won't show up by default until qemu-1.3 and
F-18 has 1.2 but it does have all the features backported.

To make the features available you need to set the pci revision of
the qxl-vga device to revision 4.

You can do that by adding: "-global qxl-vga.revision=4" to your
qemu cmdline. If you're using libvirt, see this post:
http://blog.vmsplice.net/2011/04/how-to-pass-qemu-command-line-options.html
For howto add extra qemu cmdline options when launching through libvirt.

So TL;DR:
-Get Fedora 18 as both host and guest
-Make sure qemu is launched with "-global qxl-vga.revision=4"
  on the cmdline
-Log into an X user session inside the F-18 guest
-Now check the displays menu of remote-/virt-viewer

Regards,

Hans