Re: [libvirt] Cannot find suitable emulator for x86_64

On Wed, Jun 13, 2018 at 06:13:04PM +0300, Mathieu Tarral wrote: > 2018-06-13 18:07 GMT+03:00 Daniel P. Berrangé <berrange(a)redhat.com&gt;: > > 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 ? No that just says there's no previous capabiltiies stored in the cache, which is expected since I just told you to delete the cache :-)

Please attach the full debug log, after running 'virsh capabilities'