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Re: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx
- To: Roman Shaposhnik <roman@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 31 Jul 2019 20:46:36 +0100
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- Cc: "jgross@xxxxxxxx" <jgross@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "boris.ostrovsky@xxxxxxxxxx" <boris.ostrovsky@xxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>
- Delivery-date: Wed, 31 Jul 2019 19:47:02 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 31/07/2019 20:35, Roman Shaposhnik wrote:
> On Wed, Jul 31, 2019 at 1:43 AM Roger Pau Monné <roger.pau@xxxxxxxxxx> wrote:
>> On Wed, Jul 31, 2019 at 10:36:31AM +0200, Roger Pau Monné wrote:
>>> On Tue, Jul 30, 2019 at 10:55:24AM -0700, Roman Shaposhnik wrote:
>>>> Sorry -- got a bit distracted yesterday. Attached is the log with only
>>>> your latest patch attached. Interestingly enough the box booted fine
>>>> without screen artifacts. So I guess we're getting closer...
>>>>
>>>> Thanks for all the help!
>>> That's quite weird, there's no functional changes between the
>>> previous patches and this one, the only difference is that this patch
>>> has more verbose output.
>>>
>>> Are you sure you didn't have any local patches on top of Xen that
>>> could explain this difference in behaviour?
>> FWIW, can you please try the plain patch again:
>>
>> https://lists.xenproject.org/archives/html/xen-devel/2019-07/msg01547.html
>>
>> And report back?
>>
>> I would like to get this committed ASAP if it does fix your issue.
> I'd like to say that it did -- but I tried it again just now and it
> still garbled screen and tons of:
>
> (XEN) printk: 26665 messages suppressed.
> (XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
> 8e14c000, iommu reg = ffff82c0008de000
>
> I'm very much confused by what's going on, but it seems that's the
> case -- adding those debug print statements make the issue go away
>
> Here are the patches that are being applied:
> NOT WORKING:
> https://github.com/rvs/eve/blob/xen-bug/pkg/xen/01-iommu-mappings.patch
>
> WORKING:
> https://github.com/rvs/eve/blob/a1291fcd4e669df2a63285afb5e8b4841f45c1c8/pkg/xen/01-iommu-mappings.patch
>
> At this point I'm really not sure what's going on.
Ok. seeing as you've double checked this, the mystery deepens.
My bet is on the intel_iommu_lookup_page() call having side effects[1].
If you take out the debugging in the middle of the loop in
rmrr_identity_mapping(), does the problem reproduce again?
~Andrew
[1] Looking at the internals of addr_to_dma_page_maddr(), it does 100%
more memory allocation and higher-level PTE construction than looks wise
for what is supposed to be a getter.
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