0696a5cd5f
When a host system has CPUs that are offlined via CPU hotplug, nova fails to start an instance on the host. Currently the libvirt driver does not check if the CPUs it selects for running the instance are online or offline. As a result, CPUs that are offline can become part of the cpuset that is passed to libvirt. Libvirt presents the following error in this case: libvirtError: Invalid value '8-15,24-31' for 'cpuset.cpus': Invalid argument With this fix, the nova libvirt driver makes use of the getCPUMap API in libvirt to determine if CPUs are online or offline. When selecting a CPU set for running an instance, offline CPUs are masked out. Rationale: on server platforms like s390, it is common to have offlined CPUs on a host as the platform offers capabilities to run multiple host operatings systems (e.g. multiple KVM hypervisors / compute nodes). CPUs can dynamically be assigned to the different host operating systems, so it is common to have offlined CPUs on a compute node. Change-Id: I506ebc9608e17e02d807e5002fe867309c22aafc Closes-Bug: #1417144 |
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| fixtures.py | ||