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Re: Need help to debug Arm SMMU issue seen on guests with passthrough devices
- To: Rahul Singh <Rahul.Singh@xxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxxxxx>
- From: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxxxxx>
- Date: Thu, 21 Apr 2022 17:44:36 +0100
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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 16:44:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
- Ayan
Regards,
Rahul
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