linux-kernel - Re: [PATCH] x86, CPU, AMD: Add workaround for family 16h, erratum 793

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Message-ID: <20140118110829.GA2071@amd.pavel.ucw.cz>
Date:	Sat, 18 Jan 2014 12:08:29 +0100
From:	Pavel Machek <pavel@....cz>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Kim Naru <kim.naru@....com>,
	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>,
	Sherry Hurwitz <sherry.hurwitz@....com>
Subject: Re: [PATCH] x86, CPU, AMD: Add workaround for family 16h, erratum
 793

On Sat 2014-01-18 11:42:31, Borislav Petkov wrote:
> On Sat, Jan 18, 2014 at 03:01:55AM +0100, Pavel Machek wrote:
> > I'd say that proposed "your bios has a bug"
> 
> You can always unconditionally print "your bios has a bug". Just like
> that. Without even looking.

Yeah, and we have linux-firmware testing toolkits, to discourage buggy
bioses. In this case it is "your bios has rare and dangerous bug, see CVS-1234".

> If you want to add a warning yourself, you can put it in rc.local using
> userspace goodies like msr-tools. With them you can toggle that bit ad
> absurdum - no need for the kernel except msr.ko.

?? By the time userspace is booted, you have overwritten the MSR, and
information, if the BIOS is buggy, was lost.

So linux-firmware testing toolkit actually has no chance to report
this one.


									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
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