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RE: [RFC 00/18] vfio: Adopt iommufd
From: |
Shameerali Kolothum Thodi |
Subject: |
RE: [RFC 00/18] vfio: Adopt iommufd |
Date: |
Tue, 26 Apr 2022 12:43:35 +0000 |
> -----Original Message-----
> From: Eric Auger [mailto:eric.auger@redhat.com]
> Sent: 26 April 2022 12:45
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>; Yi
> Liu <yi.l.liu@intel.com>; alex.williamson@redhat.com; cohuck@redhat.com;
> qemu-devel@nongnu.org
> Cc: david@gibson.dropbear.id.au; thuth@redhat.com; farman@linux.ibm.com;
> mjrosato@linux.ibm.com; akrowiak@linux.ibm.com; pasic@linux.ibm.com;
> jjherne@linux.ibm.com; jasowang@redhat.com; kvm@vger.kernel.org;
> jgg@nvidia.com; nicolinc@nvidia.com; eric.auger.pro@gmail.com;
> kevin.tian@intel.com; chao.p.peng@intel.com; yi.y.sun@intel.com;
> peterx@redhat.com; Zhangfei Gao <zhangfei.gao@linaro.org>
> Subject: Re: [RFC 00/18] vfio: Adopt iommufd
[...]
> >>
> https://lore.kernel.org/kvm/0-v1-e79cd8d168e8+6-iommufd_jgg@nvidia.com
> >> /
> >> [2] https://github.com/luxis1999/iommufd/tree/iommufd-v5.17-rc6
> >> [3] https://github.com/luxis1999/qemu/tree/qemu-for-5.17-rc6-vm-rfcv1
> > Hi,
> >
> > I had a go with the above branches on our ARM64 platform trying to
> pass-through
> > a VF dev, but Qemu reports an error as below,
> >
> > [ 0.444728] hisi_sec2 0000:00:01.0: enabling device (0000 -> 0002)
> > qemu-system-aarch64-iommufd: IOMMU_IOAS_MAP failed: Bad address
> > qemu-system-aarch64-iommufd: vfio_container_dma_map(0xaaaafeb40ce0,
> 0x8000000000, 0x10000, 0xffffb40ef000) = -14 (Bad address)
> >
> > I think this happens for the dev BAR addr range. I haven't debugged the
> kernel
> > yet to see where it actually reports that.
> Does it prevent your assigned device from working? I have such errors
> too but this is a known issue. This is due to the fact P2P DMA is not
> supported yet.
>
Yes, the basic tests all good so far. I am still not very clear how it works if
the map() fails though. It looks like it fails in,
iommufd_ioas_map()
iopt_map_user_pages()
iopt_map_pages()
..
pfn_reader_pin_pages()
So does it mean it just works because the page is resident()?
Thanks,
Shameer
- Re: [RFC 00/18] vfio: Adopt iommufd, (continued)
- Re: [RFC 00/18] vfio: Adopt iommufd, Jason Gunthorpe, 2022/04/25
- Re: [RFC 00/18] vfio: Adopt iommufd, Alex Williamson, 2022/04/25
- RE: [RFC 00/18] vfio: Adopt iommufd, Tian, Kevin, 2022/04/26
- Re: [RFC 00/18] vfio: Adopt iommufd, Jason Gunthorpe, 2022/04/26
- Re: [RFC 00/18] vfio: Adopt iommufd, Alex Williamson, 2022/04/26
- Re: [RFC 00/18] vfio: Adopt iommufd, Jason Gunthorpe, 2022/04/26
Re: [RFC 00/18] vfio: Adopt iommufd, Eric Auger, 2022/04/25
RE: [RFC 00/18] vfio: Adopt iommufd, Shameerali Kolothum Thodi, 2022/04/26