From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aravind Gopalakrishnan Subject: Re: [PATCH] x86, amd_ucode: Skip microcode updates for final levels Date: Fri, 31 Jul 2015 15:51:24 -0500 Message-ID: <55BBDFCC.8000401@amd.com> References: <1438273386-4733-1-git-send-email-aravind.gopalakrishnan@amd.com> <55BA5866.4070009@citrix.com> <55BBDE61.8060806@amd.com> <55BBDF1C.3080809@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55BBDF1C.3080809@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Andrew Cooper , jbeulich@suse.com Cc: boris.ostrovsky@oracle.com, xen-devel@lists.xen.org, keir@xen.org, Suravee.Suthikulpanit@amd.com, "Hurwitz, Sherry" List-Id: xen-devel@lists.xenproject.org On 7/31/2015 3:48 PM, Andrew Cooper wrote: > >> So, the patch id values have only been obtained empirically. >> The Linux patch provides the bug reference for >> this:https://bugzilla.suse.com/show_bug.cgi?id=913996 >> (It's a fairly long thread but the gist of it is that people >> predominantly seem to be experiencing system hang issues >> when they try to update microcode levels from these patch ids: >> 0x01000098, 0x0100009f, 0x010000af) >> >> From discussing about it internally, we gathered that OS/hypervisor >> cannot reliably perform microcode updates beyond these specified levels >> due to HW issues. > Ok - please include this information in the comment as well please. > Will do that. Thanks, -Aravind.