linux-kernel - [PATCH RFC 0/3] virtio-pci: iommu support

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Date:	Mon, 18 Apr 2016 12:58:08 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jason Wang <jasowang@...hat.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Wei Liu <wei.liu2@...rix.com>,
	David Woodhouse <dwmw2@...radead.org>,
	virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org,
	kvm@...r.kernel.org
Subject: [PATCH RFC 0/3] virtio-pci: iommu support

This is an attempt to allow enabling IOMMU for DMA.
Design:
	- new feature bit IOMMU_PLATFORM which means
          host won't bypass IOMMU
	- virtio core uses DMA API if it sees IOMMU_PLATFORM
	- add quirk for vfio to disable device unless IOMMU_PLATFORM is set
          or the no-iommu mode is enabled
	- while I'm not sure how it will be used, it seems like a good idea to
	  also have ability to distinguish between a legacy device and one
	  where iommu is bypassed intentionally.  To this end, add another feature bit
	  IOMMU_PASSTHROUGH. We don't acknowledge it if IOMMU_PLATFORM is set.

TODO:
	- I'm not sure whether there are setups that mix IOMMU
	  and no-IOMMU configs. If so, failing on probe might not
	  be the right thing to do, should fail binding to IOMMU group instead.


Michael S. Tsirkin (3):
  virtio: add features for IOMMU control
  vfio: report group noiommu status
  vfio: add virtio pci quirk

 drivers/vfio/pci/vfio_pci_private.h          |   1 +
 include/uapi/linux/virtio_config.h           |  10 +-
 drivers/vfio/pci/vfio_pci.c                  |  13 ++-
 drivers/vfio/pci/vfio_pci_virtio.c           | 142 +++++++++++++++++++++++++++
 drivers/vfio/platform/vfio_platform_common.c |   2 +-
 drivers/vfio/vfio.c                          |   5 +-
 drivers/virtio/virtio_ring.c                 |  18 +++-
 Documentation/vfio.txt                       |   4 +-
 drivers/vfio/pci/Makefile                    |   1 +
 9 files changed, 190 insertions(+), 6 deletions(-)
 create mode 100644 drivers/vfio/pci/vfio_pci_virtio.c

-- 
MST