On 03/08/2015 20:54, Boris Ostrovsky wrote: > On 08/03/2015 03:34 PM, Aravind Gopalakrishnan wrote: >> Some of older[Fam10h] systems require that certain number of >> applied microcode patch levels should not be overwritten by >> the microcode loader. Otherwise, system hangs are known to occur. >> >> The 'final_levels' of patch ids have been obtained empirically. >> Refer bug https://bugzilla.suse.com/show_bug.cgi?id=913996 >> for details of the issue. >> >> The short version is that people have predominantly noticed >> system hang issues when trying to update microcode levels >> beyond the patch IDs below. >> [0x01000098, 0x0100009f, 0x010000af] >> >> From internal discussions, we gathered that OS/hypervisor >> cannot reliably perform microcode updates beyond these levels >> due to hardware issues. Therefore, we need to abort microcode >> update process if we hit any of these levels. >> >> In this patch, we check for those microcode versions and abort >> if the current core has one of those final patch levels applied >> by the BIOS >> >> A linux version of the patch has already made it into tip- >> http://marc.info/?l=linux-kernel&m=143703405627170 >> >> Signed-off-by: Aravind Gopalakrishnan <aravind.gopalakrish...@amd.com> >> Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com> > > Reviewed-by: Boris Ostrovsky <boris.ostrov...@oracle.com>
For the avoidance of any confusion, I am happy for my R-b to stand, given this addition to the patch. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
