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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: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 21 Apr 2022 13:47:39 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Rahul Singh <rahul.singh@xxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Thu, 21 Apr 2022 11:48:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.04.2022 13:12, Ayan Kumar Halder 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
>
> (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".
I have no clue what any of this means. I wonder how I ended up on your
To: list. I'd like to ask everyone to drop me from the recipients list
in their replies.
Jan
> This issue is seen regardless we use 'mmu-masters' or 'iommus' property
> in xen device tree.
>
> I can confirm that this issue was not seen in xen-4.14.3. It is seen in
> our (Xilinx's) latest release ie xen-4.16.1.
>
> I am using our downstream fork of Xen. I can't readily use the upstream
> as we use lot of EEMI codebase.
>
>
> Can someone try to see if this issue exists in the latest upstream Xen ?
>
> Any pointers on how to debug this further ?
>
> Kind regards,
>
> Ayan
>
>
>
>
>
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