Hi, On 10/30/20 4:47 PM, Rahul Singh wrote: > Hello Oleksandr, > >> On 30 Oct 2020, at 10:44 am, Oleksandr Andrushchenko >> <oleksandr_andrushche...@epam.com> 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.au...@redhat.com/__;!!GF_29dbcQIUBPA!h-EaE0OnSbXtLBSwIS311alDl7pn8sH7sihgIYqilM5-r-8kCH6USNNlLB3xhbzc6eczUOrhcw$ >> [patchwork[.]ozlabs[.]org] > Regards, > Rahul
Thank you, Oleksandr
