[libvirt-users] aliases for graphic devices
Hello, AFAIK, aliases cannot be set for Graphics devices. I tried this very simple experiment with libvirt 1.2.4 (from virt-preview on F20) relevant part of the input xml: <graphics type='spice' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.0'/> </graphics> <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.1'/> </graphics> # virsh -c qemu:///system virsh # create testdom_spice_vnc_aliases.xml # see attachment Domain fedora19 created from testdom_spice_vnc_aliases.xml virsh # dumpxml fedora19 # only relevant part, see attachment for full output [...] <graphics type='spice' port='5900' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <graphics type='vnc' port='5901' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> [...] So, are really aliases not allowed for the Graphics Devices or am I doing something wrong? If aliases aren't allowed, any plans to support them? Thanks and best regards, -- Francesco Romani RedHat Engineering Virtualization R & D Phone: 8261328 IRC: fromani
On 05/14/2014 09:47 AM, Francesco Romani wrote:
Hello,
AFAIK, aliases cannot be set for Graphics devices. I tried this very simple experiment with libvirt 1.2.4 (from virt-preview on F20)
relevant part of the input xml:
<graphics type='spice' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.0'/> </graphics>
Aliases are output-only; they are ignored on input. Libvirt demands total control over the alias field, because it interacts with qemu via the alias that libvirt chooses.
So, are really aliases not allowed for the Graphics Devices or am I doing something wrong? If aliases aren't allowed, any plans to support them?
No plans to support user-specified aliases on input. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
On Wed, May 14, 2014 at 10:28:13AM -0600, Eric Blake wrote:
On 05/14/2014 09:47 AM, Francesco Romani wrote:
Hello,
AFAIK, aliases cannot be set for Graphics devices. I tried this very simple experiment with libvirt 1.2.4 (from virt-preview on F20)
relevant part of the input xml:
<graphics type='spice' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.0'/> </graphics>
Aliases are output-only; they are ignored on input. Libvirt demands total control over the alias field, because it interacts with qemu via the alias that libvirt chooses.
Furthermore with older QEMU versions, we have no choice in aliases - we had to use what QEMU hardcoded Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
----- Original Message -----
From: "Daniel P. Berrange" <berrange@redhat.com> To: "Eric Blake" <eblake@redhat.com> Cc: "Francesco Romani" <fromani@redhat.com>, libvirt-users@redhat.com Sent: Wednesday, May 14, 2014 7:24:13 PM Subject: Re: [libvirt-users] aliases for graphic devices
On Wed, May 14, 2014 at 10:28:13AM -0600, Eric Blake wrote:
On 05/14/2014 09:47 AM, Francesco Romani wrote:
Hello,
AFAIK, aliases cannot be set for Graphics devices. I tried this very simple experiment with libvirt 1.2.4 (from virt-preview on F20)
relevant part of the input xml:
<graphics type='spice' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.0'/> </graphics>
Aliases are output-only; they are ignored on input. Libvirt demands total control over the alias field, because it interacts with qemu via the alias that libvirt chooses.
Furthermore with older QEMU versions, we have no choice in aliases - we had to use what QEMU hardcoded
Thanks to you and to Eric for the answers. If I understood correctly there are no plans to have libvirt-generated aliases for the graphics devices, is that true? If so, I think the only way to distinguish the graphics device is per type (spice, vnc,...), and the final implication of this hypothesis is that no more of one device per type is supported, right? I'm asking because I understood this from the documentation (and from a few experiments) and I just want to be sure my interpretation is 100% correct. Thanks and best regards, -- Francesco Romani RedHat Engineering Virtualization R & D Phone: 8261328 IRC: fromani
On Wed, May 14, 2014 at 03:41:38PM -0400, Francesco Romani wrote:
----- Original Message -----
From: "Daniel P. Berrange" <berrange@redhat.com> To: "Eric Blake" <eblake@redhat.com> Cc: "Francesco Romani" <fromani@redhat.com>, libvirt-users@redhat.com Sent: Wednesday, May 14, 2014 7:24:13 PM Subject: Re: [libvirt-users] aliases for graphic devices
On Wed, May 14, 2014 at 10:28:13AM -0600, Eric Blake wrote:
On 05/14/2014 09:47 AM, Francesco Romani wrote:
Hello,
AFAIK, aliases cannot be set for Graphics devices. I tried this very simple experiment with libvirt 1.2.4 (from virt-preview on F20)
relevant part of the input xml:
<graphics type='spice' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.0'/> </graphics>
Aliases are output-only; they are ignored on input. Libvirt demands total control over the alias field, because it interacts with qemu via the alias that libvirt chooses.
Furthermore with older QEMU versions, we have no choice in aliases - we had to use what QEMU hardcoded
Thanks to you and to Eric for the answers.
If I understood correctly there are no plans to have libvirt-generated aliases for the graphics devices, is that true?
If so, I think the only way to distinguish the graphics device is per type (spice, vnc,...), and the final implication of this hypothesis is that no more of one device per type is supported, right?
Correct, there should be at most one entry per type. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
On Wed, May 14, 2014 at 11:47:16AM -0400, Francesco Romani wrote:
Hello,
AFAIK, aliases cannot be set for Graphics devices. I tried this very simple experiment with libvirt 1.2.4 (from virt-preview on F20)
relevant part of the input xml:
<graphics type='spice' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.0'/> </graphics> <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <alias name='display.1'/> </graphics>
# virsh -c qemu:///system virsh # create testdom_spice_vnc_aliases.xml # see attachment Domain fedora19 created from testdom_spice_vnc_aliases.xml
virsh # dumpxml fedora19 # only relevant part, see attachment for full output [...] <graphics type='spice' port='5900' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <graphics type='vnc' port='5901' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> [...]
So, are really aliases not allowed for the Graphics Devices or am I doing something wrong? If aliases aren't allowed, any plans to support them?
Note that in addition to what Eric said, the <graphics> tags don't represent actual guest devices, so the concept of device aliases doesn't really apply here. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
participants (3)
-
Daniel P. Berrange -
Eric Blake -
Francesco Romani