Re: [Xen-devel] [PATCH] x86, amd_ucode: Skip microcode updates for final levels

2015-07-31 Thread Aravind Gopalakrishnan
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 expe

Re: [Xen-devel] [PATCH] x86, amd_ucode: Skip microcode updates for final levels

2015-07-31 Thread Andrew Cooper
On 31/07/2015 21:45, Aravind Gopalakrishnan wrote: > On 7/30/2015 12:01 PM, Andrew Cooper wrote: >> On 30/07/15 17:23, Aravind Gopalakrishnan wrote: >>> Some of older[Fam10h] systems require that the microcode versions >>> that it comes up with should not be updated by the microcode driver. >>> Oth

Re: [Xen-devel] [PATCH] x86, amd_ucode: Skip microcode updates for final levels

2015-07-31 Thread Aravind Gopalakrishnan
On 7/30/2015 12:01 PM, Andrew Cooper wrote: On 30/07/15 17:23, Aravind Gopalakrishnan wrote: Some of older[Fam10h] systems require that the microcode versions that it comes up with should not be updated by the microcode driver. Otherwise, system hangs are known to occur. In this patch, we check

Re: [Xen-devel] [PATCH] x86, amd_ucode: Skip microcode updates for final levels

2015-07-30 Thread Andrew Cooper
On 30/07/15 17:23, Aravind Gopalakrishnan wrote: > Some of older[Fam10h] systems require that the microcode versions > that it comes up with should not be updated by the microcode driver. > Otherwise, system hangs are known to occur. > > In this patch, we check for those microcode versions and abor

Re: [Xen-devel] [PATCH] x86, amd_ucode: Skip microcode updates for final levels

2015-07-30 Thread Boris Ostrovsky
On 07/30/2015 12:23 PM, Aravind Gopalakrishnan wrote: Some of older[Fam10h] systems require that the microcode versions that it comes up with should not be updated by the microcode driver. Otherwise, system hangs are known to occur. In this patch, we check for those microcode versions and abort

[Xen-devel] [PATCH] x86, amd_ucode: Skip microcode updates for final levels

2015-07-30 Thread Aravind Gopalakrishnan
Some of older[Fam10h] systems require that the microcode versions that it comes up with should not be updated by the microcode driver. Otherwise, system hangs are known to occur. In this patch, we check for those microcode versions and abort the update process if existing microcode level is alread