From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Wang <wei.wang2@amd.com>
Subject: Re: Using debug-key 'o:  Dump IOMMU p2m table,
 locks up machine
Date: Wed, 5 Sep 2012 14:30:44 +0200
Message-ID: <504745F4.5060906@amd.com>
References: <40501859.20120902104331@eikelenboom.it>
	<CC6932C2.3D99D%keir.xen@gmail.com>
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	<5044CAD7.8030800@amd.com>
	<1144695277.20120904184345@eikelenboom.it>
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To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Keir Fraser <keir.xen@gmail.com>, Jan Beulich <JBeulich@suse.com>, Santosh Jodh <Santosh.Jodh@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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On 09/04/2012 06:43 PM, Sander Eikelenboom wrote:
> Hello Wei,
> >
> Tried it and it doesn't help.
> I now even got a "xl dmesg" which shows a IO_PAGE_FAULT occuring very early, before any toolstack or guest can be involved:
>
> (XEN) [2012-09-04 15:51:17] AMD-Vi: Setup I/O page table: device id = 0x0a05, root table = 0x24d84b000, domain = 0, paging mode = 3
> (XEN) [2012-09-04 15:51:17] AMD-Vi: Setup I/O page table: device id = 0x0a06, root table = 0x24d84b000, domain = 0, paging mode = 3
> (XEN) [2012-09-04 15:51:17] AMD-Vi: Setup I/O page table: device id = 0x0a07, root table = 0x24d84b000, domain = 0, paging mode = 3
> (XEN) [2012-09-04 15:51:17] AMD-Vi: Setup I/O page table: device id = 0x0b00, root table = 0x24d84b000, domain = 0, paging mode = 3
> (XEN) [2012-09-04 15:51:17] Scrubbing Free RAM: ...........................<0>AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x0a06, fault address = 0xc2c2c2c0


you have dom0_mem=1024M, so you could try to remove this line any see if 
it disappears. It would also be helpful to provide a lspci output from 
your system.

Thanks,
Wei

> (XEN) [2012-09-04 15:51:18] ............................................done.
> (XEN) [2012-09-04 15:51:19] Initial low memory virq threshold set at 0x4000 pages.
> (XEN) [2012-09-04 15:51:19] Std. Loglevel: All
> (XEN) [2012-09-04 15:51:19] Guest Loglevel: All
> (XEN) [2012-09-04 15:51:19] Xen is relinquishing VGA console.
>
>
> Complete dmesg attached.
>
>> Thanks,
>> Wei
>
>>>>    -- Keir
>>>
>>>>>
>>>>>
>>>>>>    -- Keir
>>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>
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>
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>