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 in v11?
mdev core:
Register mdev_bus class when first device is registed to avoid panic if
any vendor driver and mdev driver are selected as built-in but vendor
driver loads first and then mdev module.
vfio_mdev:
Added notifier callback function to mdev parent's ops so that notifer
is registered from vfio_mdev module during device open and unregistered
it from device close call. This is a optional callback. Some drivers
using mdev framework might not pin or unpin pages, for example the
sample mtty driver that simulates serial port. Vendor driver who need to
pin/unpin pages should provide this callback. Otherwise pin request
would fail.
vfio_iommu_type1:
Updated to keep track of who (task and address space) mapped iova range.
During DMA_UNMAP, same task who mapped it or other task who shares same
address space is allowed to unmap, otherwise unmap fails.
QEMU maps few iova ranges initially, then fork threads and from the child
thread calls DMA_UNMAP on previously mapped iova. Since child shares same
address space, DMA_UNMAP is successful.
Address space keeps track of pages pinned (pfn_list) by external user /
mdev devices. This pfn_list is used to verify pfn during unpin_request,
re-accounting of pages when direct device assigned in hot-unplugged and
mdev device is present in same container.
When the container is released, all mapped iova from all tasks are
unmapped and removed.
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
Patch series tested with linux-next upto commit 14970f204b19 @Fri Oct 28
Resolved against conflicting change:
05692d7005a3 vfio/pci: Fix integer overflows, bitmask check
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 | 122 ++
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 | 334 +++++-
drivers/vfio/vfio_iommu_type1.c | 831 ++++++++++++--
include/linux/mdev.h | 176 +++
include/linux/vfio.h | 32 +-
include/uapi/linux/vfio.h | 10 +
samples/vfio-mdev/Makefile | 13 +
samples/vfio-mdev/mtty.c | 1503 +++++++++++++++++++++++++
21 files changed, 4342 insertions(+), 218 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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