This update for xen fixes the following issues:
CVE-2021-28701: Fixed race condition in XENMAPSPACEgranttable handling (XSA-384) (bsc#1189632).
CVE-2021-28694,CVE-2021-28695,CVE-2021-28696: Fixed IOMMU page mapping issues on x86 (XSA-378)(bsc#1189373).
CVE-2021-28690: Fixed x86 TSX Async Abort protections not restored after S3 (XSA-377)(bsc#1186434).
Prevent superpage allocation in the LAPIC and ACPI_INFO range (bsc#1189882).