Hi, I can confirm that this report makes sense. I was the person
reporting it upstream and doing some debugging/bisecting to find the
cause.

https://lists.xenproject.org/archives/html/xen-
devel/2018-12/msg02403.html

The bug causes the uptime of the two dom0s that live migration is done
from/to to have an effect on the uptime counter (as seen in dmesg
output) of the domU. This causes TCP timestamps to bork all over the
place and cause network connections to stall.

I'd advise the reporter to test this kernel with the patch applied and
use it in a reproduction scenario, where live migrate hits the bug all
the time, and where it doesn't hit it anymore with the patch.

Thanks, Hans

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https://bugs.launchpad.net/bugs/1830440

Title:
  Xen guest time corrupted after live migration in linux-
  image-4.15.0-50-generic and linux-image-generic-hwe-18.04

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