linux-kernel - Re: [PATCH 2/2] x86, microcode: Make reload interface per system

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Date:	Fri, 22 Jun 2012 05:01:01 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...64.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>, X86-ML <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 2/2] x86, microcode: Make reload interface per system

On Thu, Jun 21, 2012 at 08:00:59PM -0300, Henrique de Moraes Holschuh wrote:
> Meh.  I uploaded the first public version of the thing a whole two weeks
> ago!  It should have been all over the Internet by now ;-)
> 
> It is in Debian Wheezy (soon-to-be-stable) as of yesterday, I think.  It
> will eventually end up in Ubuntu.  And if you guys think it is worthwhile to
> maintain it upstream either in git.k.o, or as part of tools/, I have nothing
> against it.
> 
> I posted the URL earlier, I think, but here it is:
> http://cdn.debian.net/debian/pool/contrib/i/iucode-tool/iucode-tool_0.8.orig.tar.bz2
> 
> But it really exists to help distros do Intel microcode management and
> release install-and-forget packages for end users.  End-users should get to
> either ignore its existence entirely and get automated updates of microcode
> as distro binary packages, or run an "update-intel-microcode" script (not
> written yet, but there is one on Debian and Ubuntu's microcode.ctl package)
> that downloads the blob from Intel, and does whatever is needed to install
> it to /lib/firmware and apply it to the running system (and kernel image,
> initramfs, whatever).

Yeah, this is all very helpful but let's see whether we are even going
to need a tool, at all. If we are tool-less, we don't depend on any
userspace stuff and ucode application just works like ftrace - no need
for a specific tool but the shell and debugfs (sysfs in our case).

Thanks.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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