[PATCH v7 0/7] Add virtio-iommu driver

Jean-Philippe Brucker
2019-01-15T12:19:52Z

Implement the virtio-iommu driver, following specification v0.9 [1].

This is a simple rebase onto Linux v5.0-rc2. We now use the
dev_iommu_fwspec_get() helper introduced in v5.0 instead of accessing
dev->iommu_fwspec, but there aren't any functional change from v6 [2].

Our current goal for virtio-iommu is to get a paravirtual IOMMU working
on Arm, and enable device assignment to guest userspace. In this
use-case the mappings are static, and don't require optimal performance,
so this series tries to keep things simple. However there is plenty more
to do for features and optimizations, and having this base in v5.1 would
be good. Given that most of the changes are to drivers/iommu, I believe
the driver and future changes should go via the IOMMU tree.

You can find Linux driver and kvmtool device on v0.9.2 branches [3],
module and x86 support on virtio-iommu/devel. Also tested with Eric's
QEMU device [4]. Please note that the series depends on Robin's
probe-deferral fix [5], which will hopefully land in v5.0.

[1] Virtio-iommu specification v0.9, sources and pdf
git://linux-arm.org/virtio-iommu.git virtio-iommu/v0.9
http://jpbrucker.net/virtio-iommu/spec/v0.9/virtio-iommu-v0.9.pdf

[2] [PATCH v6 0/7] Add virtio-iommu driver
https://lists.linuxfoundation.org/pipermail/iommu/2018-December/032127.html

[3] git://linux-arm.org/linux-jpb.git virtio-iommu/v0.9.2
git://linux-arm.org/kvmtool-jpb.git virtio-iommu/v0.9.2

[4] [RFC v9 00/17] VIRTIO-IOMMU device
https://www.mail-archive.com/qemu-devel@nongnu.org/msg575578.html

[5] [PATCH] iommu/of: Fix probe-deferral
https://www.spinics.net/lists/arm-kernel/msg698371.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 | 1158 +++++++++++++++++
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, 1449 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

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