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RE: [EXT] Re: Xen SMMU support
- To: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- From: Anda-alexandra Dorneanu <anda-alexandra.dorneanu@xxxxxxx>
- Date: Thu, 13 Aug 2020 14:35:45 +0000
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- Cc: "xen-users@xxxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxxx>, nd <nd@xxxxxxx>, Rahul Singh <Rahul.Singh@xxxxxxx>, Laurentiu Tudor <laurentiu.tudor@xxxxxxx>, Diana Madalina Craciun <diana.craciun@xxxxxxx>, Peng Fan <peng.fan@xxxxxxx>
- Delivery-date: Thu, 13 Aug 2020 14:37:56 +0000
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- Thread-topic: [EXT] Re: Xen SMMU support
-----Original Message-----
From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
Sent: Thursday, July 2, 2020 12:55 PM
To: Anda-alexandra Dorneanu <anda-alexandra.dorneanu@xxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxxx; nd <nd@xxxxxxx>; Rahul Singh
<Rahul.Singh@xxxxxxx>
Subject: [EXT] Re: Xen SMMU support
Caution: EXT Email
Hi Anda
> On 2 Jul 2020, at 06:54, Anda-alexandra Dorneanu
> <anda-alexandra.dorneanu@xxxxxxx> wrote:
>
> Hi,
>
> I am currently running Xen with SMMU enabled on an ARM64 platform with 4
> Cortex-A72 cores, GICv2 and SMMUv2. There are SMMU faults when booting Dom0,
> such as:
>
> [ 3.972767] mmc0: sdhci: Resp(XEN) smmu:
> /soc/iommu@9000000: Unhandled context fault: fsr=0x402, iova=0xea060200,
> fsynr=0x180000, cb=0
>
> Has someone encountered such problems and can provide some guidelines for
> SMMU support on Dom0?
This means that the access to 0xea060200 was forbidden by the SMMU.
It also tells you that the DMA master ID of your device is handled by the SMMU
context bank 0
So first thing to check is if 0xea060200 is a valid guest physical address in
your Dom0.
Normally Xen should use the same page tables for the SMMU and the dom0 so if
something is accessible by the guest it is accessible for the devices assign to
it.
Here the device seem to properly be assigned to dom0 so maybe the driver is
trying to hit somewhere invalid ?
[Anda]: Thank you for the given suggestions.
Turns out that it was an issue with the Xen SMMU driver. We will send a patch
with the fix.
Regards,
Anda
Regards
Bertrand
>
> Regards,
> Anda
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