[PATCH 0/3] ppc:Set runlatch bits correctly for offline threads and vcpus

Preeti U Murthy preeti at linux.vnet.ibm.com
Fri Apr 11 20:11:25 EST 2014

The runlatch bits with their value indicated by CTRL_RUNLATCH are set and
cleared in the SPRN_CTRL registers to indicate a busy and idle cpu
respectively. This is currently being done in the cpuidle path of the host.
But needs to be taken care of in hotplug and kvm scenarios. This patchset
is aimed at ensuring that the runlatch bits are consisten with the
utilization of a CPU under all circumstances.

Preeti U Murthy (3):
      ppc/powernv: Set the runlatch bits correctly for offline cpus
      ppc/kvm: Set the runlatch bit of a CPU just before starting guest
      ppc/kvm: Clear the runlatch bit of a vcpu before napping

 arch/powerpc/kvm/book3s_hv_rmhandlers.S |   18 +++++++++++++++++-
 arch/powerpc/platforms/powernv/smp.c    |    3 +++
 2 files changed, 20 insertions(+), 1 deletion(-)


More information about the Linuxppc-dev mailing list