** Changed in: nova Status: In Progress => Invalid -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1588003
Title: Skip host to guest CPU compatibility check for emulated (QEMU "TCG" mode) guests during live migration Status in OpenStack Compute (nova): Invalid Status in OpenStack Compute (nova) liberty series: In Progress Status in OpenStack Compute (nova) mitaka series: Fix Committed Bug description: The _compare_cpu() method of Nova's libvirt driver performs guest vCPU model to destination host CPU model comparison (during live migration) even in the case of emulated (QEMU "TCG" mode) guests, where the CPU instructions are emulated completely in software, and no hardware acceleration, such as KVM is involved. From nova/virt/libvirt/driver.py: [...] 5464 def _compare_cpu(self, guest_cpu, host_cpu_str, instance): 5465 """Check the host is compatible with the requested CPU [...] [...] 5481 if CONF.libvirt.virt_type not in ['qemu', 'kvm']: 5482 return 5483 Skip the comparison for 'qemu' part above. Fix for master branch is here: https://review.openstack.org/#/c/323467/ -- libvirt: Skip CPU compatibility check for emulated guests This bug is for stable branch backports: Mitaka and Liberty. [Thanks: Daniel P. Berrange for the pointer.] Related context and references ------------------------------ (a) This upstream discussion thread where using the custom CPU model ("gate64") is causing live migration CI jobs to fail. http://lists.openstack.org/pipermail/openstack-dev/2016-May/095811.html -- "[gate] [nova] live migration, libvirt 1.3, and the gate" (b) Gate DevStack change to avoid setting the custom CPU model in nova.conf https://review.openstack.org/#/c/320925/4 -- don't set libvirt cpu_model To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1588003/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp