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

From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>

Date: Fri, 30 Oct 2020 15:02:30 +0000

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Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Bertrand Marquis <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 15:02:44 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Thread-index: AQHWrqmeCV4SGlhADU2GY14D47cn76mwOdAAgAAEO4A=

Thread-topic: [XEN PATCH v1] xen/arm : Add support for SMMUv3 driver

Hi, On 10/30/20 4:47 PM, Rahul Singh wrote: > Hello Oleksandr, > >> On 30 Oct 2020, at 10:44 am, Oleksandr Andrushchenko >> <Oleksandr_Andrushchenko@xxxxxxxx> wrote: >> >> 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 > I have limited knowledge about QEMU internals.As what I see from the logs, > fault is occurred at early driver initialisation when SMMU driver is trying > to probe the HW. > >> (XEN) Data Abort Trap. Syndrome=0x1940010 >> (XEN) Walking Hypervisor VA 0x40031000 on CPU0 via TTBR 0x00000000b8469000 >> (XEN) 0TH[0x0] = 0x00000000b8468f7f >> >> [snip] >> >> 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. > Yes as of now only Stage-2 is supported in XEN.If we have any requirement or > use case that depends on Stage-1 translation we can support that also in XEN. The use case is below: PCI passthrough and various configurations including SR-IOV which is possible with QEMU... > >> >> 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, >> >> Oleksandr >> >> [1] >> https://urldefense.com/v3/__https://patchwork.ozlabs.org/project/qemu-devel/cover/1524665762-31355-1-git-send-email-eric.auger@xxxxxxxxxx/__;!!GF_29dbcQIUBPA!h-EaE0OnSbXtLBSwIS311alDl7pn8sH7sihgIYqilM5-r-8kCH6USNNlLB3xhbzc6eczUOrhcw$ >> [patchwork[.]ozlabs[.]org] > Regards, > Rahul Thank you, Oleksandr

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