tree ba4f2691dd1d806f617754eb4ee1d5f68ed53008
parent 317b0a6d8ba44e9bf8f9c3dbd776c4536843d82c
author Alexander Graf <agraf@suse.de> 1409925165 -0300
committer Paolo Bonzini <pbonzini@redhat.com> 1410858698 +0200

kvmclock: Ensure time in migration never goes backward

When we migrate we ask the kernel about its current belief on what the guest
time would be. However, I've seen cases where the kvmclock guest structure
indicates a time more recent than the kvm returned time.

To make sure we never go backwards, calculate what the guest would have seen as time at the point of migration and use that value instead of the kernel returned one when it's more recent.
This bases the view of the kvmclock after migration on the
same foundation in host as well as guest.

Signed-off-by: Alexander Graf <agraf@suse.de>
Cc: qemu-stable@nongnu.org
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>