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

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Message-ID: <87d34r5n4f.fsf@spindle.srvr.nix>
Date:	Fri, 22 Jun 2012 17:26:24 +0100
From:	Nix <nix@...eri.org.uk>
To:	Borislav Petkov <bp@...64.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"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 20 Jun 2012, Borislav Petkov uttered the following:
> I know, right. Whose idea was it to do it like that I don't know.
> AFAICT, Intel delivers ucode as a single blob too, so why split it? The
> driver picks out the right blob anyway.

Only if supplied over the old interface. Over the new interface,
we just see

    microcode: error! Bad data in microcode data file

in the log. So clearly the driver doesn't know how to split up the
microcode.bin that Intel provides, and (until Henrique's iucode-tool or
something like it becomes ubiquitous) the old interface, and
microcode_ctl, cannot be removed.

-- 
NULL && (void)
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