SUSE-SU-2018:2081-2 Security update for xen

This update for xen fixes the following issues: Security issues fixed: - CVE-2018-12891: Fix preemption checks bypass in x86 PV MM handling XSA-264 bsc1097521. - CVE-2018-12892: Fix libxl failure to honour readonly flag on HVM emulated SCSI disks XSA-266 bsc1097523. - CVE-2018-12893: Fix DB...