As another test (still running qemu-git-2.1.0-rc2-git-20140721), I
disabled NTP on the two servers (and rebooted them), but left it running
on the guest.

When doing the migration, server a (where the guest was running) had an
NTP offset of -3.037619 s, and server b was at -3.337718 s. The guest
was nicely synchronized before the migration, but afterwards had a clock
offset of 0.349590 s, which roughly corresponds to the difference in
offsets. The small NTP offset on the guest after the migration implies
that it did briefly freeze, but too short to notice. I'll leave it
running for longer to be able to confirm this with sufficient accuracy.

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https://bugs.launchpad.net/bugs/1297218

Title:
  guest hangs after live migration due to tsc jump

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