linux-kernel - [VT-d reboot problems] Re: [PATCH] x86 / reboot: Blacklist Dell OptiPlex 990 known to require PCI reboot

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Message-ID: <20120131121513.GE32010@elte.hu>
Date:	Tue, 31 Jan 2012 13:15:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Bastien ROUCARIES <roucaries.bastien@...il.com>,
	Avi Kivity <avi@...hat.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	KVM devel mailing list <kvm@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [VT-d reboot problems] Re: [PATCH] x86 / reboot: Blacklist Dell
 OptiPlex 990 known to require PCI reboot


(added KVM folks to the Cc:)

* Bastien ROUCARIES <roucaries.bastien@...il.com> wrote:

> Ping^2
> 
> Bastien
> On Mon, Jan 23, 2012 at 11:28 AM, Bastien ROUCARIES
> <roucaries.bastien@...il.com> wrote:
> > On Mon, Jan 16, 2012 at 8:21 PM, H. Peter Anvin <hpa@...or.com> wrote:
> >> On 01/16/2012 03:27 AM, Bastien ROUCARIES wrote:
> >>>>
> >>>> Does it work if you disable VT-d in the firmware? If so, then adding it
> >>>> to the reboot method blacklist is the wrong fix - we need to figure out
> >>>> why VT-d interferes with Dell's reboot code.
> >>>
> >>> Yes it work
> >>>
> >>
> >> This is particularly so since we are very close to having a full Dell
> >> model catalogue in the kernel...
> >
> > Ping ? Do you need some dump ? testing ?

So disabling VT-d in the BIOS fixes the reboot problem and 
Matthew Garrett suggests we should figure out why and how VT-d 
on this Dell box interferes with the reboot method.

Thanks,

	Ingo
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