[libvirt] Cannot find suitable emulator for x86_64

[Mathieu Tarral]

2018-06-13 18:07 GMT+03:00 Daniel P. Berrangé <berrange at redhat.com>:
> On Wed, Jun 13, 2018 at 05:59:37PM +0300, Mathieu Tarral wrote:
>> >> >
>> >> > What version of QEMU do you have installed ?  Libvirt has recently
>> >> > become more aggressive at requiring modern QEMU versions, so its
>> >> > possible if your old libvirt was running against old QEMU, that
>> >> > might not be supported with new libvirt.
>> >>
>> >> I'm using QEMU 2.8 here.
>> >> That might explain why libvirt cannot find a version that is modern enough.
>> >
>> > 2.8 is plenty new enough, so that's not the issue.
>>
>> Alright, so let's focus on libvirt 4.4.0.
>>
>> When I start the daemon, i can see some warnings related to QEMU:
>>
>> warning : virQEMUCapsInit:942 : Failed to get host CPU cache info
>> warning : virQEMUCapsInit:949 : Failed to get host power management capabilities
>>
>> Could this be the reason, or the beginning of an explanation ?
>> How can I dig and find what is the root cause ?
>
> Best bet is to edit libvirtd.conf and set
>
>   log_filters="1:qemu_capabilities"
>   log_outputs="1:file:/var/log/libvirtd.log"
>
> and then rm -rf /var/cache/libvirt/qemu and restart libvirtd. The log
> file should tell you it is detecting qemu-system-x86_64 and probing it.
> If anything fails it should be covered in the logs.

Thanks, i have more information now:

debug : virQEMUCapsCacheLookup:4561 : Returning caps (nil) for
/usr/bin/qemu-system-x86_64
debug : virQEMUCapsCacheLookup:4561 : Returning caps (nil) for /usr/bin/kvm

Does this help you ?


-- 
Mathieu Tarral