This update for xen fixes the following issues:
Security issue fixed:
CVE-2021-28689: Fixed some x86 speculative vulnerabilities with bare (non-shim) 32-bit PV guests (XSA-370) (bsc#1185104)
Make sure xencommons is in a format as expected by fillup. (bsc#1185682)
Each comment needs to be followed by an enabled key. Otherwise fillup will remove manually enabled key=value pairs, along with everything that looks like a stale comment, during next pkg update
A recent systemd update caused a regression in xenstored.service systemd now fails to track units that use systemd-notify (bsc#1183790)