On Tue, Nov 27, 2018 at 06:09:25PM +0100, Auger Eric wrote: > Hi Michael, > > On 11/27/18 5:53 PM, Michael S. Tsirkin wrote: > > On Thu, Nov 22, 2018 at 07:37:54PM +0000, Jean-Philippe Brucker wrote: > >> Implement the virtio-iommu driver, following specification v0.9 [1]. > >> > >> Since v4 [2] I fixed the issues reported by Eric, and added Reviewed-by > >> from Eric and Rob. Thanks! > >> > >> I changed the specification to fix one inconsistency discussed in v4. > >> That the device fills the probe buffer with zeroes is now a "SHOULD" > >> instead of a "MAY", since it's the only way for the driver to know if > >> the device wrote the status. Existing devices already do this. In > >> addition the device now needs to fill the three padding bytes at the > >> tail with zeroes. > >> > >> You can find Linux driver and kvmtool device on branches > >> virtio-iommu/v0.9 [3]. I also lightly tested with Eric's latest QEMU > >> device [4]. > > > > I tried to get this to work on my x86 box but without > > success. Any hints? Does this have to do with the IORT table? > > I think we really should just reserve our own table ID > > and avoid the pain of trying to add things to the IORT spec. > > I'm reluctant to merge lots of code that I can't easily test. > > Again, if we found a way to push more configuration into > > virtio config space the problem space would be smaller. > > You can at least test it with QEMU ARM virt in TCG mode. It's slow enough that I generally just focus on KVM. > Then I have > worked on the IORT integration in PC/Q35 but this is not yet functional. > I need to debug what's wrong on guest ACPI probing. I plan to work on > this this week. > > Thanks > > Eric Sounds good. Did you need to make changes to IORT? I don't remember. If yes it would be very easy to just have a virtio specific ACPI table - I am assuming ARM guys will be just as hostile to virt changes to IORT as they were to minor changes to ARM vIOMMU. > > > >> [1] Virtio-iommu specification v0.9, sources, pdf and diff from v0.8 > >> git://linux-arm.org/virtio-iommu.git virtio-iommu/v0.9 > >> http://jpbrucker.net/virtio-iommu/spec/v0.9/virtio-iommu-v0.9.pdf > >> http://jpbrucker.net/virtio-iommu/spec/diffs/virtio-iommu-pdf-diff-v0.8-v0.9.pdf > >> > >> [2] [PATCH v4 0/7] Add virtio-iommu driver > >> https://lists.linuxfoundation.org/pipermail/iommu/2018-November/031074.html > >> > >> [3] git://linux-arm.org/linux-jpb.git virtio-iommu/v0.9 > >> git://linux-arm.org/kvmtool-jpb.git virtio-iommu/v0.9 > >> > >> [4] [RFC v9 00/17] VIRTIO-IOMMU device > >> https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/msg575578.html > >> > >> Jean-Philippe Brucker (7): > >> dt-bindings: virtio-mmio: Add IOMMU description > >> dt-bindings: virtio: Add virtio-pci-iommu node > >> of: Allow the iommu-map property to omit untranslated devices > >> PCI: OF: Initialize dev->fwnode appropriately > >> iommu: Add virtio-iommu driver > >> iommu/virtio: Add probe request > >> iommu/virtio: Add event queue > >> > >> .../devicetree/bindings/virtio/iommu.txt | 66 + > >> .../devicetree/bindings/virtio/mmio.txt | 30 + > >> MAINTAINERS | 7 + > >> drivers/iommu/Kconfig | 11 + > >> drivers/iommu/Makefile | 1 + > >> drivers/iommu/virtio-iommu.c | 1157 +++++++++++++++++ > >> drivers/of/base.c | 10 +- > >> drivers/pci/of.c | 7 + > >> include/uapi/linux/virtio_ids.h | 1 + > >> include/uapi/linux/virtio_iommu.h | 161 +++ > >> 10 files changed, 1448 insertions(+), 3 deletions(-) > >> create mode 100644 Documentation/devicetree/bindings/virtio/iommu.txt > >> create mode 100644 drivers/iommu/virtio-iommu.c > >> create mode 100644 include/uapi/linux/virtio_iommu.h > >> > >> -- > >> 2.19.1
