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Re: [XEN PATCH v1] xen/arm : Add support for SMMUv3 driver

  • To: Rahul Singh <rahul.singh@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
  • Date: Fri, 30 Oct 2020 10:44:19 +0000
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  • Cc: "bertrand.marquis@xxxxxxx" <bertrand.marquis@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
  • Delivery-date: Fri, 30 Oct 2020 10:44:51 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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  • Thread-topic: [XEN PATCH v1] xen/arm : Add support for SMMUv3 driver

Hi, Rahul!

On 10/20/20 6:25 PM, Rahul Singh wrote:
> Add support for ARM architected SMMUv3 implementations. It is based on
> the Linux SMMUv3 driver.
> Major differences between the Linux driver are as follows:
> 1. Only Stage-2 translation is supported as compared to the Linux driver
>     that supports both Stage-1 and Stage-2 translations.

First of all thank you for the efforts!

I tried the patch with QEMU and would like to know if my understanding correct

that this combination will not work as of now:

(XEN) SMMUv3: /smmuv3@9050000: SMMUv3: DT value = eventq
(XEN) Data Abort Trap. Syndrome=0x1940010
(XEN) Walking Hypervisor VA 0x40031000 on CPU0 via TTBR 0x00000000b8469000
(XEN) 0TH[0x0] = 0x00000000b8468f7f


If this is expected then is there any plan to make QEMU work as well?

I see [1] says that "Only stage 1 and AArch64 PTW are supported." on QEMU side.

We are interested in QEMU/SMMUv3 as a flexible platform for PCI passthrough

implementation, so it could allow testing different setups and configurations 
with QEMU.

Thank you in advance,





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