linux-kernel - Re: [PATCH v2] x86, vt-d: enable x2apic opt out

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Message-ID: <1305625748.8008.98.camel@i7.infradead.org>
Date:	Tue, 17 May 2011 10:49:08 +0100
From:	"Woodhouse, David" <david.woodhouse@...el.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	"Song, Youquan" <youquan.song@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"Kay, Allen M" <allen.m.kay@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Liu, Kent" <kent.liu@...el.com>,
	Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH v2] x86, vt-d: enable x2apic opt out

On Mon, 2011-05-16 at 21:32 +0100, Alex Williamson wrote:
> Just a guess, but the OEM probably hasn't updated their SMI handlers to
> understand x2apic yet and won't before the product ships because some
> other OS doesn't bother to use x2apic. 

Yay, crappy closed-source BIOS holds back the platform yet again.

>  We can still enable interrupt remapping w/o x2apic though, so I'm
> curious what other irq injection tricks you're referring to.  Thanks,

http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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