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Re: Need help to debug Arm SMMU issue seen on guests with passthrough devices
- To: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxxxxx>
- From: Rahul Singh <Rahul.Singh@xxxxxxx>
- Date: Thu, 21 Apr 2022 16:54:49 +0000
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- Cc: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 21 Apr 2022 16:55:09 +0000
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- Thread-topic: Need help to debug Arm SMMU issue seen on guests with passthrough devices
Hi Ayan,
> On 21 Apr 2022, at 5:44 pm, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxxxxx>
> wrote:
>
> Hi Rahul,
>
> On 21/04/2022 14:21, Rahul Singh wrote:
>> Hi Ayan,
>>
>> > On 21 Apr 2022, at 12:12 pm, Ayan Kumar Halder
>> > <ayan.kumar.halder@xxxxxxxxxx> wrote:
>> >
>> > Hi Arm/SMMU experts,
>> >
>> > Scenario :- I am trying to assign a device (eg mmc) to a guest which uses
>> > smmu. I start the guest using "xl create -c ...". It works fine for the
>> > first time. I am able to access the device.
>> >
>> > Now, when I destroy the guest and create again, I see this issue
>>
>> Did you observe any other Xen error while deassigning and assigning the
>> device ?
>> >
>> > (XEN) smmu: /axi/smmu@fd800000: GFSR 0x00000002, GFSYNR0 0x00000000,
>> > GFSYNR1 0x00000871, GFSYNR2 0x00000000
>> >
>> > 0x871 is the stream id used by mmc.
>> >
>> > We are using SMMU-500. So from the Arm SMMU v2 specs, it is "Unidentified
>> > stream fault" for stream id "0x871".
>>
>> Yes, you are right above error means that Unidentified stream fault. That
>> means SMMU hardware is not set up for streamId 0x0000087
>> I just try to go through the SMMU code and observe that this issue may be
>> related to iommu group but I am not maybe I am wrong.
>> I just created the patch that is not tested. Please try to apply the patch
>> and test it once.
>
> Many thanks for looking into this. With your patch, the issue is resolved.
>
> Are you going to send out this patch for review ? You can add my "Tested-by"
> tag.
>
Good to know that the issue has been resolved. Yes, I will send the patch for
review.
Regards,
Rahul
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