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xen-devel
RE: [Xen-devel] New DMAR errors in Xen 4.1
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To: |
"Han, Weidong" <weidong.han@xxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
RE: [Xen-devel] New DMAR errors in Xen 4.1 |
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From: |
"Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
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Date: |
Wed, 7 Apr 2010 16:31:16 +0800 |
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Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Wed, 07 Apr 2010 01:32:10 -0700 |
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AcrV/TNAysZs+KrzR8CKZj1H5vRjYQALYMjQ |
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Thread-topic: |
[Xen-devel] New DMAR errors in Xen 4.1 |
Weidong Han wrote:
> Jeremy Fitzhardinge wrote:
>> On 04/06/2010 03:38 PM, Jeremy Fitzhardinge wrote:
>>
>>> I'm seeing DMAR errors with current Xen-unstable, which weren't
>>> there in -rc8 (-rc9?):
>>> ...
>>>
>>> Device 0:1f.2 is my SATA controller. I haven't tried bisecting it
>>> or anything yet; I don't see any recent changes which are obviously
>>> relevant though.
>>>
>>
>> It turns out its... "Enable debug=y by default in the build." So I
>> guess these errors have been happening silently thus far?
>>
>> J
>>
> I don't encounter this issue. These DMAR fault messages will be
> printed even when debug=n. what platform are you using? could you
> post complete booting log with "iommu=verbose"?
Hi Jeremy,
My first thought is: the checking of the 2 "if" statements in
iommu_set_dom0_mapping() might be buggy.
Please comment them out to see if the error messages will disappear -- if the
msgs do disappear, we need to find out why the checking causes the issue.
Thanks,
-- Dexuan
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