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[Nikola Đipanov <ndipanov@xxxxxxxxxx>]

Public bug reported:

Reporting this based on code inspection of the current master (commit:
9f61d1eb642785734f19b5b23365f80f033c3d9a)

When we attempt to live-migrate an instance onto a host that has a
different vcpu_pin_set than the one that was on the source host, we may
either break the policy set by the destination host or fail (as we will
not recalculate the vcpu cpuset attribute to match that of the
destination host, so we may end up with an invalid range).

The first solution that jumps out is to make sure the XML is updated in
https://github.com/openstack/nova/blob/6d68462c4f20a0b93a04828cb829e86b7680d8a4/nova/virt/libvirt/driver.py#L5422

However that would mean passing over the requested info from the
destination host.

** Affects: nova
     Importance: Medium
         Status: New


** Tags: libvirt

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https://bugs.launchpad.net/bugs/1496135

Title:
  libvirt live-migration will not honor destination vcpu_pin_set config

Status in OpenStack Compute (nova):
  New

Bug description:
  Reporting this based on code inspection of the current master (commit:
  9f61d1eb642785734f19b5b23365f80f033c3d9a)

  When we attempt to live-migrate an instance onto a host that has a
  different vcpu_pin_set than the one that was on the source host, we
  may either break the policy set by the destination host or fail (as we
  will not recalculate the vcpu cpuset attribute to match that of the
  destination host, so we may end up with an invalid range).

  The first solution that jumps out is to make sure the XML is updated
  in
  https://github.com/openstack/nova/blob/6d68462c4f20a0b93a04828cb829e86b7680d8a4/nova/virt/libvirt/driver.py#L5422

  However that would mean passing over the requested info from the
  destination host.

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