[libvirt] libvirt can't get capablities

[Li Zhang]

On 07/02/2012 06:14 PM, Daniel P. Berrange wrote:
> On Mon, Jul 02, 2012 at 05:47:08PM +0800, Li Zhang wrote:
>>
>> Hi,
>>
>> I have suffered several times on both x86 machine and power machine.
>>
>> When we want to use libvirt to create on VMs, it reports "unknown OS
>> type hvm".
>>
>> We can't get <guest> capabilities.
>>
>> The log is as the following(log_level=1):
>>
>> 2003-01-02 01:21:39.895+0000: 12214: error :
>> virDomainDefParseXML:8491 : unknown OS type hvm
>> 2003-01-02 01:21:39.896+0000: 12214: error :
>> virDomainDefParseXML:8491 : unknown OS type hvm
>> 2003-01-02 01:22:00.135+0000: 12207: error :
>> qemuCapsComputeCmdFlags:1218 : unsupported configuration: this qemu
>> binary requires libvirt to be compiled with yajl
>> 2003-01-02 01:22:13.342+0000: 12207: error :
>> qemuCapsComputeCmdFlags:1218 : unsupported configuration: this qemu
>> binary requires libvirt to be compiled with yajl
>
> Hmm, this shows a flaw in the way we deal with QEMU. When detecting
> QEMU for the purpose of the capabilities XML, IMHO, we should *not*
> be raising this error.   Errors in detecting capabilities are more
> or less invisible to users of libvirt, since they do not occur in
> response to a specific API call.
>
> Thus, we should have reported the capabilities XML as normal here,
> and only reported the YAJL compatibility error at the time the user
> tries to actually start a guest.
>
Got it.
I will clean this to avoid the same problem in the future.

>
> Daniel
>


-- 
Best Regards
Li

IBM LTC, China System&Technology Lab, Beijing