linux-kernel - Re: [PATCH v4 0/7] x86: BSP or CPU0 online/offline

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Message-ID: <20111206141543.GA19241@aftab>
Date:	Tue, 6 Dec 2011 15:15:43 +0100
From:	Borislav Petkov <bp@...64.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Fenghua Yu <fenghua.yu@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Arjan van de Ven <arjan.van.de.ven@...el.com>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Len Brown <len.brown@...el.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>, x86 <x86@...nel.org>,
	Tejun Heo <tj@...nel.org>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>
Subject: Re: [PATCH v4 0/7] x86: BSP or CPU0 online/offline

On Tue, Dec 06, 2011 at 07:34:37PM +0530, Srivatsa S. Bhat wrote:
> > Not blindly, the microcode is still verified.
> > 
> I saw your other mail about the validity of this whole scenario, and I
> kind of agree to your point.
> 
> My thoughts below might not be so relevant/significant considering that,
> but anyways, just to understand what you said above:
> I didn't quite find where the microcode is verified if the kernel happens
> to have the microcode image already.

Sorry, I might not've been clear enough: it is still verified by the
_hardware_, regardless of whether the ucode loader checks it or not.
Remember, hw guys don't trust sw guys and the reverse holds true too.

:-)

HTH.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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