linux-kernel - Re: [Pkg-xen-devel] ioatdma: Boot process hangs then reboots when using Xen + Linux 3.2

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Message-ID: <20120302162159.GB31683@wavehammer.waldi.eu.org>
Date:	Fri, 2 Mar 2012 17:21:59 +0100
From:	Bastian Blank <waldi@...ian.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Jonathan Nieder <jrnieder@...il.com>,
	xen-devel@...ts.xensource.com,
	pkg-xen-devel@...ts.alioth.debian.org,
	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	linux-kernel@...r.kernel.org, William Dauchy <wdauchy@...il.com>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>
Subject: Re: [Pkg-xen-devel] ioatdma: Boot process hangs then reboots when
 using Xen + Linux 3.2

On Thu, Mar 01, 2012 at 10:42:44PM -0800, Dan Williams wrote:
> WARN_ON may work, but then kernel may be subject random hangs from missed
> i/o completions.

Why is that? Currently it just dies if was triggered via interrupt and
for some reason no active descriptor was found.

>                   Is xen32 using vt-d?

Yes. Xen can use VT-D.

>                                         Just wondering if writes from ioat
> device are getting misdirected.

How do VT-D and ioat interact?

Bastian

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