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Description of problem:
virsh emulatorpin still can work when vcpu placement is "auto".The following doc describes that "emulatorpin is not allowed if attribute placement of element vcpu is "auto". "
http://libvirt.org/formatdomain.html#elementsCPUTuning

Version-Release number of selected component (if applicable):
libvirt-0.10.2-5.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
# virsh list --all
 Id    Name                           State
----------------------------------------------------
 53    yuping-rhel6                   running


# virsh dumpxml yuping-rhel6 |grep vcpu
  <vcpu placement='auto' current='2'>4</vcpu>
# virsh emulatorpin yuping-rhel6 1

# pidof qemu-kvm
79058
# cat /proc/79058/task/79058/status |grep Cpu
Cpus_allowed:	00000000,00000000,00000000,00000000,00000002
Cpus_allowed_list:	1

  
Actual results:
virsh emulatorpin still can work when vcpu placement is "auto".

Expected results:
emulatorpin is not allowed if attribute placement of element vcpu is "auto"

Additional info:

Verify it as follows. The result is expected. Move its status to VERIFIED.

# rpm -q libvirt
libvirt-0.10.2-6.el6.x86_64


# virsh dumpxml rhel6.3 |grep vcpu
  <vcpu placement='auto' current='1'>4</vcpu>


# virsh start rhel6.3
Domain rhel6.3 started


# virsh emulatorpin rhel6.3 1
error: Requested operation is not valid: Changing affinity for emulator thread dynamically is not allowed when CPU placement is 'auto'

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0276.html