From: Wei Wang <wei.wang2@amd.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>,
Keir Fraser <keir.xen@gmail.com>,
Santosh Jodh <Santosh.Jodh@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: Using debug-key 'o: Dump IOMMU p2m table, locks up machine
Date: Wed, 5 Sep 2012 16:15:41 +0200 [thread overview]
Message-ID: <50475E8D.2090709@amd.com> (raw)
In-Reply-To: <5047483F0200007800098C18@nat28.tlf.novell.com>
On 09/05/2012 12:40 PM, Jan Beulich wrote:
>>>> On 05.09.12 at 12:25, Sander Eikelenboom<linux@eikelenboom.it> wrote:
>> Wednesday, September 5, 2012, 12:14:02 PM, you wrote:
>>>>>> On 04.09.12 at 18:43, Sander Eikelenboom<linux@eikelenboom.it> wrote:
>>>> ...........................<0>AMD-Vi: IO_PAGE_FAULT: domain = 0, device id =
>>>> 0x0a06, fault address = 0xc2c2c2c0
>>
>>> Looks like use of uninitialized memory (assuming you're using a
>>> debug hypervisor, that's the pattern scrub_one_page() puts
>>> there). But it's unclear to me what device should be doing any
>>> I/O at that point (and even if one does, how it would get the
>>> bad address loaded). What is 0a:00.6?
>>
>> since 4.2-rc4 is still unstable it has debug=y for what i know, so yes.
>> This particular IO_PAGE_FAULT happened before the kernel loads, so the
>> kernel and pciback shouldn't be causing the issue one would say.
>> With pciback i'm hiding 03:06.0, 04:00.*, 05:00.0, 0a:00.* and 07:00.0 at
>> boot.
>>
>> Is there any code i could add to get more info where it comes from ?
>
> Hardly, since those accesses are asynchronous to what the CPUs
> do. But ...
>
>> 0a:00.6 USB controller: NetMos Technology MCS9990 PCIe to 4âPort USB 2.0 Host Controller
>
> ... are your keyboard/mouse perhaps connected to this one? In
> which case I'd suppose the 1:1 tables set up for Dom0 might not
> be complete. Wei?
I checked this on my machine using 'o' key and it has been mapped as a
2MB frame see: gfn: 000c2c00 mfn: 000c2c00. But maybe I have no device
access to this address... Another possibility is interrupt message. 4.1
does not show IO_PAGE_FAULT for interrupts, but 4.2 does (changeset
23199:dbd98ab2f87f). I will send a patch to dump flags from IO_PAGE_FAULT.
Thanks,
Wei
> Jan
>
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next prev parent reply other threads:[~2012-09-05 14:15 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-31 21:45 Using debug-key 'o: Dump IOMMU p2m table, locks up machine Sander Eikelenboom
2012-08-31 22:24 ` Santosh Jodh
2012-08-31 22:42 ` Sander Eikelenboom
2012-08-31 22:57 ` Santosh Jodh
2012-08-31 23:16 ` Sander Eikelenboom
2012-08-31 23:58 ` Santosh Jodh
2012-09-01 0:42 ` Santosh Jodh
2012-09-03 8:14 ` Jan Beulich
2012-09-01 2:01 ` Keir Fraser
2012-09-01 17:03 ` Santosh Jodh
2012-09-01 19:13 ` Keir Fraser
2012-09-02 2:08 ` Santosh Jodh
2012-09-02 7:13 ` Keir Fraser
2012-09-02 7:19 ` Keir Fraser
2012-09-02 8:43 ` Sander Eikelenboom
2012-09-02 14:58 ` Keir Fraser
2012-09-02 15:14 ` Sander Eikelenboom
2012-09-03 15:20 ` Wei Wang
2012-09-04 8:21 ` Sander Eikelenboom
2012-09-04 16:43 ` Sander Eikelenboom
2012-09-05 10:14 ` Jan Beulich
2012-09-05 10:25 ` Sander Eikelenboom
2012-09-05 10:40 ` Jan Beulich
2012-09-05 10:48 ` Sander Eikelenboom
2012-09-05 11:41 ` Jan Beulich
2012-09-05 12:11 ` Sander Eikelenboom
2012-09-05 14:15 ` Wei Wang [this message]
2012-09-05 15:05 ` Jan Beulich
2012-09-05 12:48 ` Wei Wang
2012-09-05 12:30 ` Wei Wang
2012-09-03 8:21 ` Jan Beulich
2012-09-03 8:33 ` Sander Eikelenboom
2012-09-03 9:05 ` Jan Beulich
2012-09-04 7:08 ` Sander Eikelenboom
2012-09-04 7:46 ` Jan Beulich
2012-09-04 8:13 ` Sander Eikelenboom
2012-09-04 9:26 ` Jan Beulich
2012-10-02 20:09 ` Konrad Rzeszutek Wilk
2012-10-03 13:12 ` Jan Beulich
2012-10-02 20:54 ` Matt Wilson
2012-09-20 8:08 ` Jan Beulich
2012-09-28 14:08 ` Sander Eikelenboom
2012-09-28 21:26 ` Jeremy Fitzhardinge
2012-10-02 20:08 ` Konrad Rzeszutek Wilk
2012-09-02 7:42 ` Keir Fraser
2012-09-04 6:35 ` Jan Beulich
2012-09-04 6:52 ` Sander Eikelenboom
2012-09-04 7:01 ` Keir Fraser
2012-09-04 6:59 ` Keir Fraser
2012-09-04 7:55 ` Jan Beulich
2012-09-04 8:04 ` Keir Fraser
2012-09-04 8:11 ` Keir Fraser
2012-09-04 8:20 ` Sander Eikelenboom
2012-09-04 8:38 ` Jan Beulich
2012-09-04 8:54 ` Keir Fraser
2012-09-04 9:40 ` Jan Beulich
2012-09-04 13:29 ` Andrew Cooper
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