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[OpenStack Infra <1614054@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/356383
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=6683bf9b7dc575ef9516f0cdc395b8da1b81c233
Submitter: Jenkins
Branch:    master

commit 6683bf9b7dc575ef9516f0cdc395b8da1b81c233
Author: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@xxxxxxxxxx>
Date:   Wed Aug 17 06:51:25 2016 -0400

    libvirt: fix incorrect host cpus giving to emulator threads when RT
    
    Realtime guarantees in certain operating systems require that the
    thread that is running the QEMU emulator is pinned to a physical CPU
    that is *not* the same as any physical CPU that the vCPUs for a
    realtime guest are pinned to. This patch ensures that the value of the
    hw:cpu_realtime_mask flavor extraspec property is respected when
    creating the libvirt configuration XML and sets emulatorpin values to
    a physical CPU matching the hw:cpu_realtime_mask value.
    
    Change-Id: I7f50dde0753b059a690dc50172fee645c94b8e5b
    Closes-Bug: #1614054


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1614054

Title:
  Incorrect host cpu is given to emulator threads when cpu_realtime_mask
  flag is set

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Description of problem:
  When using the cpu_realtime and cpu_realtim_mask flag to create new instance, the 'cpuset' of 'emulatorpin' option is using the id of vcpu which is incorrect. The id of host cpu should be used here.

  e.g.
    <cputune>
      <vcpupin vcpu='0' cpuset='2'/>
      <vcpupin vcpu='1' cpuset='3'/>
      <emulatorpin cpuset='0'/>          ### the cpuset should be '2' here, when cpu_realtime_mask=^0.  
      <vcpusched vcpus='1' scheduler='fifo' priority='1'/>
    </cputune>

  How reproducible:
  Boot new instance with cpu_realtime_mask flavor.

  Steps to Reproduce:
  1. Create RT flavor
  nova flavor-create m1.small.performance 6 2048 20 2
  nova flavor-key m1.small.performance set hw:cpu_realtime=yes
  nova flavor-key m1.small.performance set hw:cpu_realtime_mask=^0
  nova flavor-key m1.small.performance set hw:cpu_policy=dedicated
  2. Boot a instance with this flavor
  3. Check the xml of the new instance

  Actual results:
    <cputune>
      <vcpupin vcpu='0' cpuset='2'/>
      <vcpupin vcpu='1' cpuset='3'/>
      <emulatorpin cpuset='0'/>          
      <vcpusched vcpus='1' scheduler='fifo' priority='1'/>
    </cputune>

  Expected results:
    <cputune>
      <vcpupin vcpu='0' cpuset='2'/>
      <vcpupin vcpu='1' cpuset='3'/>
      <emulatorpin cpuset='2'/>          
      <vcpusched vcpus='1' scheduler='fifo' priority='1'/>
    </cputune>

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