linux-kernel - Re: [GIT PULL] x86 fixes

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Date:	Sat, 12 Oct 2013 13:35:42 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <matthew.garrett@...ula.com>
CC:	Ingo Molnar <mingo@...nel.org>, Avi Kivity <avi@...hat.com>,
	Len Brown <len.brown@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86 fixes

On 10/12/2013 12:41 PM, Linus Torvalds wrote:
> On Sat, Oct 12, 2013 at 12:28 PM, Matthew Garrett
> <matthew.garrett@...ula.com> wrote:
>>
>> The most likely cause of the problem that we're seeing here is that we're leaving the hardware in a state that isn't compatible with assumptions made by Dell's SMM code. We've certainly seen that some previous Dell machines have made incorrect assumptions about VT-d, which probably means that we should be destroying that state before reboot. David Woodhouse had been looking into that - I don't know whether we ever actually merged anything to do so.
> 
> I have access to one of the affected Dell systems, so I'm willing to
> try patches..
> 

The Dell machines definitely use some kind of SMM to reboot.

	-hpa


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