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Tim Wiederhake 3fc4412c6f qemu: support kvm-poll-control performance hint 
QEMU version 4.2 introduced a performance feature under commit
d645e13287 ("kvm: i386: halt poll control MSR support").

This patch adds a new KVM feature 'poll-control' to set this performance
hint for KVM guests. The feature is off by default.

To enable this hint and have libvirt add "-cpu host,kvm-poll-control=on"
to the QEMU command line, the following XML code needs to be added to the
guest's domain description:

  <features>
    <kvm>
      <poll-control state='on'/>
    </kvm>
  </features>

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2020-11-17 14:40:46 +01:00
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