RE: [PATCH v4 0/9] Enhance vfio PCI hot reset for vfio cdev device

Liu, Yi L
2023-04-26T15:08:22Z

> From: Liu, Yi L <yi.l.liu@intel.com>
> Sent: Wednesday, April 26, 2023 10:54 PM
>
> VFIO_DEVICE_PCI_HOT_RESET requires user to pass an array of group fds
> to prove that it owns all devices affected by resetting the calling
> device. While for cdev devices, user can use an iommufd-based ownership
> checking model and invoke VFIO_DEVICE_PCI_HOT_RESET with a zero-length
> fd array.
>
> This series first creates iommufd_access for noiommu devices to fill the
> gap for adding iommufd-based ownership checking model, then extends
> VFIO_DEVICE_GET_PCI_HOT_RESET_INFO to check ownership and return the
> check result and the devid of affected devices to user. In the end, extends
> the VFIO_DEVICE_PCI_HOT_RESET to accept zero-length fd array for hot-reset
> with cdev devices.
>
> The new hot reset method and updated _INFO ioctl are tested with the
> below qemu:
>
> https://github.com/yiliu1765/qemu/tree/iommufd_rfcv4.mig.reset.v4_var3
> (requires to test with the cdev kernel)

The cdev kernel is below branch, this series is part of below branch.

https://github.com/yiliu1765/iommufd/tree/vfio_device_cdev_v10

Regards,
Yi Liu