[libvirt] libvirt unable to start domains

[Guannan Ren]

On 01/04/2013 08:30 AM, Doug Goldstein wrote:
> On Thu, Jan 3, 2013 at 5:58 PM, Zeeshan Ali (Khattak)
> <zeeshanak at gnome.org> wrote:
>> On Thu, Jan 3, 2013 at 11:44 PM, Zeeshan Ali (Khattak)
>> <zeeshanak at gnome.org> wrote:
>>> Hi,
>>>    I updated my libvirt git clone and install yesterday (after about a
>>> month or so) and now I can't start domains:
>>>
>>> $ virsh start fedora18
>>> error: Failed to start domain fedora18
>>> error: unsupported configuration: This QEMU does not support QXL
>>> graphics adapters
>>>
>>> While libvirt is self-built, I'm using qemu 1.2.2-1.fc18 from vanila
>>> Fedora 18 repo. Just to be clear, qemu was not updated before the
>>> problem appeared, only libvirt.
>>>
>>> Here is the libvirtd log:
>>> http://static.fi/~zeenix/tmp/libvirtd-session-zeenix.log (13 MB).
>>>
>>> Also attaching the domain config.
>> If my `git bisect run` script worked, I've found the commit
>> introducing this issue:
>>
>> 4c993d8ab5473334e9d4155faa913476ada39069 is the first bad commit
>> commit 4c993d8ab5473334e9d4155faa913476ada39069
>> Author: Guannan Ren <gren at redhat.com>
>> Date:   Fri Dec 14 15:06:31 2012 +0800
>>
>>      qemu: add qemu vga devices caps and one cap to mark them usable
>>
>>      QEMU_CAPS_DEVICE_QXL          -device qxl
>>      QEMU_CAPS_DEVICE_VGA          -device VGA
>>      QEMU_CAPS_DEVICE_CIRRUS_VGA   -device cirrus-vga
>>      QEMU_CAPS_DEVICE_VMWARE_SVGA  -device vmware-svga
>>
>>      QEMU_CAPS_DEVICE_VIDEO_PRIMARY  /* safe to use -device XXX
>>                                       for primary video device */
>>
>>      Fix a typo in qemuCapsObjectTypes, the string 'qxl' here
>>      should be -device qxl rather than -vga [...|qxl|..]
>>
>> :040000 040000 576dc9f1e74fae8b5d8c75349cc769e17c5f7758
>> 5afc50956ad09cf6e740ce75800d746a53513271 M      src
>> :040000 040000 0b95704f11e9aacbd4c6510e29343a497c52c11e
>> fbd9445a795a2814d8739805ebaf9c7c2f0d4160 M      tests
>> bisect run success
>>
>> FWIW, problem is not reproducible against the parent commit
>> 34ca5684970fc5e4be0ec29809b73dea7be2d84f.
>>
>> --
>> Regards,
>>
>> Zeeshan Ali (Khattak)
>> FSF member#5124
>>
> Basically for some reason we tried to build the command line up as
> qemu-kvm ... -vga qxl instead of -device qxl-vga which is what I
> thought Guannan was aiming for. I could be wrong though. I'll take
> another look at it tonight.
>

         When libvirt reports this error, probably the qemu you are 
using doesn't support
         qxl-vga as the primary video device, and at the same time the 
qemu doesn't
         support "-vga qxl" either.

         The reason why libvirt worked out before is that there is a 
typo for the caps flag bit
         QEMU_CAPS_VGA_QXL fixed in the above commit. And libvirt didn't set
         QEMU_CAPS_VGA_QXL on for qemu(>1.2) by using QMP mode to check 
for qemu
         capabilities.

           -    { "qxl", QEMU_CAPS_VGA_QXL },
          +    { "qxl", QEMU_CAPS_DEVICE_QXL },

          So Doug's patch probably could fix your problem temporarily, 
but we need to think it
          through as Eric said.

          Guannan




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