tree adc373a2ebfc3a9e3cad989b1e17ce226fedc8c6
parent 08b006ca6bb70ec3a5157efc8b38509ed84f16a5
author Gerd Hoffmann <kraxel@redhat.com> 1233766324 +0100
committer Avi Kivity <avi@redhat.com> 1234358043 +0200

KVM: Fix kvmclock on !constant_tsc boxes

kvmclock currently falls apart on machines without constant tsc.
This patch fixes it.  Changes:

  * keep tsc frequency in a per-cpu variable.
  * handle kvmclock update using a new request flag, thus checking
    whenever we need an update each time we enter guest context.
  * use a cpufreq notifier to track frequency changes and force
    kvmclock updates.
  * send ipis to kick cpu out of guest context if needed to make
    sure the guest doesn't see stale values.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>