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Re: [RFC 00/18] vfio: Adopt iommufd
From: |
Nicolin Chen |
Subject: |
Re: [RFC 00/18] vfio: Adopt iommufd |
Date: |
Mon, 18 Apr 2022 20:26:20 -0700 |
On Sun, Apr 17, 2022 at 12:30:40PM +0200, Eric Auger wrote:
> >> - More tests
> > I did a quick test on my ARM64 platform, using "iommu=smmuv3"
> > string. The behaviors are different between using default and
> > using legacy "iommufd=off".
> >
> > The legacy pathway exits the VM with:
> > vfio 0002:01:00.0:
> > failed to setup container for group 1:
> > memory listener initialization failed:
> > Region smmuv3-iommu-memory-region-16-0:
> > device 00.02.0 requires iommu MAP notifier which is not currently
> > supported
> >
> > while the iommufd pathway started the VM but reported errors
> > from host kernel about address translation failures, probably
> > because of accessing unmapped addresses.
> >
> > I found iommufd pathway also calls error_propagate_prepend()
> > to add to errp for not supporting IOMMU_NOTIFIER_MAP, but it
> > doesn't get a chance to print errp out. Perhaps there should
> > be a final error check somewhere to exit?
>
> thank you for giving it a try.
>
> vsmmuv3 + vfio is not supported as we miss the HW nested stage support
> and SMMU does not support cache mode. If you want to test viommu on ARM
> you shall test virtio-iommu+vfio. This should work but this is not yet
> tested.
I tried "-device virtio-iommu" and "-device virtio-iommu-pci"
separately with vfio-pci, but neither seems to work. The host
SMMU driver reports Translation Faults.
Do you know what commands I should use to run QEMU for that
combination?
> I pushed a fix for the error notification issue:
> qemu-for-5.17-rc6-vm-rfcv2-rc0 on my git https://github.com/eauger/qemu.git
Yes. This fixes the problem. Thanks!
- [RFC 12/18] vfio/container-obj: Introduce [attach/detach]_device container callbacks, (continued)
- [RFC 12/18] vfio/container-obj: Introduce [attach/detach]_device container callbacks, Yi Liu, 2022/04/14
- [RFC 14/18] hw/iommufd: Creation, Yi Liu, 2022/04/14
- [RFC 15/18] vfio/iommufd: Implement iommufd backend, Yi Liu, 2022/04/14
- [RFC 16/18] vfio/iommufd: Add IOAS_COPY_DMA support, Yi Liu, 2022/04/14
- [RFC 17/18] vfio/as: Allow the selection of a given iommu backend, Yi Liu, 2022/04/14
- [RFC 18/18] vfio/pci: Add an iommufd option, Yi Liu, 2022/04/14
- Re: [RFC 00/18] vfio: Adopt iommufd, Nicolin Chen, 2022/04/15
- RE: [RFC 00/18] vfio: Adopt iommufd, Tian, Kevin, 2022/04/18
- Re: [RFC 00/18] vfio: Adopt iommufd, Alex Williamson, 2022/04/22