Hi, On 11/2/20 11:55 AM, Bertrand Marquis wrote: > Hi, > >> On 2 Nov 2020, at 05:55, Oleksandr Andrushchenko <[email protected]> wrote: >> >> Hi, Julien! >> >> On 10/30/20 7:18 PM, Julien Grall wrote: >>> Hi Oleksandr, >>> >>> On 30/10/2020 10:44, Oleksandr Andrushchenko wrote: >>>> 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 >>>> >>>> [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. >>> Just for clarication, you are trying to boot Xen on QEMU, right? >> Exactly >>> You might be able to use the stage-1 page-tables to isolate each device in >>> Xen. However, I don't think you will be able to share the P2M because the >>> page-tables layout between stage-1 and stage-2 is different. >> So, it is even more work then > Overall it would make more sense to spend some time adding proper support in > Qemu then trying to modify the driver to support Qemu right now. > >>>> >>>> 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. >>> I would recommend to get the SMMU supporting supporting stage-2 page-tables. >> You mean in QEMU? > See before. > >>> Regardless that, I think Xen should be able to say the SMMU is not >>> supported rather than crashing. >> Yes, that would be nice > Fully agree and we will look into that. > > Anything you could share so that we could quickly reproduce your setup would > be more then great.
Nothing special, qemu/aarch64-softmmu/qemu-system-aarch64 -machine type=virt -machine virt,gic-version=2 \ -machine virtualization=true -cpu cortex-a57 -smp 4 -m 2048 -nic user,hostfwd=tcp:127.0.0.1:2222-:22 \ -nographic -serial mon:stdio [..snip..] I also set iommu to smmuv3 in my tests, QEMU emulator version 4.2.1 > > Regards > Bertrand > >>> Cheers, >>> >> Thank you, >> >> Oleksandr
