On 5/30/23 6:35 PM, Tony Krowiak wrote: > When a user attempts to remove a vfio-ap mediated device attached to a > guest, the operation hangs until the mdev's fd is closed by the guest > (i.e., the hostdev is detached or the guest is shut down). This patch > series provides kernel-side code that allows userspace to set up a > communication channel that will allow the vfio_ap device driver to notify > userspace when a request to release the mdev is received, so that userspace > can close the mdev fd and avoid the hang. The patch series provides the > following: > > 1. Introduces code to handle the VFIO_DEVICE_GET_IRQ_INFO and > VFIO_DEVICE_SET_IRQS ioctl calls to set the eventfd_ctx for signaling a > device request to userspace. > > 2. Wires up the VFIO bus driver callback to request a release of the mdev. > When invoked, the vfio_ap device driver will use the eventfd_ctx set up > in #1 to signal a request to userspace to release the mdev. > As to how this series eventually reaches master... It touches both s390 and vfio. @Alex/@s390 maintainers -- I suggest it go through s390 given the diffstat, it's almost completely in s390 drivers code. However there is a uapi hit to vfio.h (in patch 1) that should get at least an ACK from Alex beforehand.
