On 05/11/16 08:10, Kirti Wankhede wrote: > 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: Patch 11/22 does not apply if the patchset is applied on top of 14970f204b19. > 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 > -- Alexey -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
