linux-kernel - Re: [PATCH] perf/x86: fix microcode revision check for SNB-PEBS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120824162646.GE2297@aftab.osrc.amd.com>
Date:	Fri, 24 Aug 2012 18:26:46 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	andi@...stfloor.org
Subject: Re: [PATCH] perf/x86: fix microcode revision check for SNB-PEBS

On Fri, Aug 24, 2012 at 06:14:51PM +0200, Stephane Eranian wrote:
> So you're saying there is a cmdline tool that can use another
> interface to pass the ucode to the kernel. I am using the
> microcode_ctl on Ubuntu 11.04. Apparently that one is still using the
> old interface. But I may not be the only one in this situation then,
> so I think it's worth fixing now.
>
> What's the tool to update the ucode using the "new" interface then?

Well,

last time we talked about it:
http://marc.info/?l=linux-kernel&m=134012203712243 I was advocating the
following way:

Put ucode image into /lib/firmware/amd-ucode or /lib/firmware/intel-ucode and then do

$ echo 1 > /sys/devices/system/cpu/microcode/reload

which I think is the easiest but hpa had some reservations about it and
wanted to keep the old method too.

But looking at the code, this *actually* should work on Intel now too.

So, I'd say you can use both on Intel, it depends on them whatever they
decide to do in the future.

On AMD we have only the "echo 1" thing.

Alternatively, "rmmod microcode; modprobe microcode" works too but some
people wouldn't want to reload modules in order to update ucode.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/