This series adds Mediated device support to Linux host kernel. Purpose
of this series is to provide a common interface for mediated device
management that can be used by different devices. This series introduces
Mdev core module that creates and manages mediated devices, VFIO based
driver for mediated devices that are created by mdev core module and
update VFIO type1 IOMMU module to support pinning & unpinning for mediated
devices.
What changed v11-> v12?
vfio_iommu_type1:
- Pinned pages are tracked in vfio_dma structure for that range, dma->iova
to dma->iova + dma->size.
- Key for pfn_list rb-tree is iova, instead of pfn.
- Removing address space structure. vfio_dma keeps task structure, which
is used to get mm structure (using get_task_mm(task) and mmput(mm)) for
pin/unpin and page accounting.
- vfio_unpin_pages() has array of user_pfns as input argument, instead of
array of pfns.
- On vfio_pin_pages(), pinning happens once. On later call to
vfio_pin_pages() with same user_pfn, if iova is found in pfn_list, only
ref_count is incremented.
- In vfio_unpin_pages(), ref_count is decremented and page is unpinned
when ref_count is 0.
- For vfio_pin_pages() and vfio_unpin_pages() input array, number of
elements in array should be less that PAGE_SIZE. If vendor driver wants
to use for more pages, array should be split it in chunks of PAGE_SIZE.
- Updating page accounting logic with above changes.
Tested by assigning below combinations of devices to a single VM:
- GPU pass through only
- vGPU device only
- One GPU pass through and one vGPU device
- Linux VM hot plug and unplug vGPU device while GPU pass through device
exist
- Linux VM hot plug and unplug GPU pass through device while vGPU device
exist
Tested with Linux 4.9-rc5
Kirti Wankhede (22):
vfio: Mediated device Core driver
vfio: VFIO based driver for Mediated devices
vfio: Rearrange functions to get vfio_group from dev
vfio: Common function to increment container_users
vfio iommu: Added pin and unpin callback functions to
vfio_iommu_driver_ops
vfio iommu type1: Update arguments of vfio_lock_acct
vfio iommu type1: Update argument of vaddr_get_pfn()
vfio iommu type1: Add find_iommu_group() function
vfio iommu type1: Add task structure to vfio_dma
vfio iommu type1: Add support for mediated devices
vfio iommu: Add blocking notifier to notify DMA_UNMAP
vfio: Add notifier callback to parent's ops structure of mdev
vfio: Introduce common function to add capabilities
vfio_pci: Update vfio_pci to use vfio_info_add_capability()
vfio: Introduce vfio_set_irqs_validate_and_prepare()
vfio_pci: Updated to use vfio_set_irqs_validate_and_prepare()
vfio_platform: Updated to use vfio_set_irqs_validate_and_prepare()
vfio: Define device_api strings
docs: Add Documentation for Mediated devices
docs: Sysfs ABI for mediated device framework
docs: Sample driver to demonstrate how to use Mediated device
framework.
MAINTAINERS: Add entry VFIO based Mediated device drivers
Documentation/ABI/testing/sysfs-bus-vfio-mdev | 111 ++
Documentation/vfio-mediated-device.txt | 399 +++++++
MAINTAINERS | 9 +
drivers/vfio/Kconfig | 1 +
drivers/vfio/Makefile | 1 +
drivers/vfio/mdev/Kconfig | 17 +
drivers/vfio/mdev/Makefile | 5 +
drivers/vfio/mdev/mdev_core.c | 388 +++++++
drivers/vfio/mdev/mdev_driver.c | 120 ++
drivers/vfio/mdev/mdev_private.h | 41 +
drivers/vfio/mdev/mdev_sysfs.c | 286 +++++
drivers/vfio/mdev/vfio_mdev.c | 167 +++
drivers/vfio/pci/vfio_pci.c | 83 +-
drivers/vfio/platform/vfio_platform_common.c | 31 +-
drivers/vfio/vfio.c | 341 +++++-
drivers/vfio/vfio_iommu_type1.c | 831 +++++++++++---
include/linux/mdev.h | 177 +++
include/linux/vfio.h | 30 +-
include/uapi/linux/vfio.h | 10 +
samples/vfio-mdev/Makefile | 13 +
samples/vfio-mdev/mtty.c | 1503 +++++++++++++++++++++++++
21 files changed, 4328 insertions(+), 236 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-vfio-mdev
create mode 100644 Documentation/vfio-mediated-device.txt
create mode 100644 drivers/vfio/mdev/Kconfig
create mode 100644 drivers/vfio/mdev/Makefile
create mode 100644 drivers/vfio/mdev/mdev_core.c
create mode 100644 drivers/vfio/mdev/mdev_driver.c
create mode 100644 drivers/vfio/mdev/mdev_private.h
create mode 100644 drivers/vfio/mdev/mdev_sysfs.c
create mode 100644 drivers/vfio/mdev/vfio_mdev.c
create mode 100644 include/linux/mdev.h
create mode 100644 samples/vfio-mdev/Makefile
create mode 100644 samples/vfio-mdev/mtty.c
--
2.7.0
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