Comment 16 for bug 882579

This report (in German) https://forge.univention.org/bugzilla/show_bug.cgi?id=23258 suggests that when the guest VM is reset by a reboot the clock jumps backward in time.

Two patches were suggested, both being necessary together:

KVM: x86: Fix kvmclock bug
backported to Natty Aug 11, 2011 but not to linux-lts-backport-natty-2.6.38 yet!!!
http://patchwork.ozlabs.org/patch/109436/
http://lkml.org/lkml/2011/5/5/436
http://bugs.launchpad.net/bugs/714335

KVM: x86: Fix a possible backwards warp of kvmclock
http://kerneltrap.org/mailarchive/linux-kernel/2010/8/20/4609037
http://choon.net/forum/read.php?21,76764