From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 4 Feb 2009 16:52:04 +0000 (+0100)
Subject: KVM: Fix kvmclock on !constant_tsc boxes
X-Git-Tag: v2.6.30-rc1~664^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c807660407a695f390034e402edfe544a1d2e40c;p=pandora-kernel.git

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>
---

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