[v2,0/2] s390x/ap: fix hang when mdev attached to guest is removed

Message

Anthony Krowiak June 2, 2023, 2:11 p.m. UTC

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 guest is shut down). This patch series provides userspace 
(i.e., qemu) code to handle device unplug requests for AP. When notified
that the mdev is being removed, the handler will unplug the device, thus
avoiding the hang condition.

Link: https://lore.kernel.org/r/[e-mail]

Tony Krowiak (2):
  linux-headers: Update with vfio_ap IRQ index mapping
  s390x/ap: Wire up the device request notifier interface

 hw/vfio/ap.c                                  | 113 ++++++++++++++++++
 include/standard-headers/linux/const.h        |   2 +-
 include/standard-headers/linux/virtio_blk.h   |  18 +--
 .../standard-headers/linux/virtio_config.h    |   6 +
 include/standard-headers/linux/virtio_net.h   |   1 +
 linux-headers/asm-arm64/kvm.h                 |  33 +++++
 linux-headers/asm-riscv/kvm.h                 |  53 +++++++-
 linux-headers/asm-riscv/unistd.h              |   9 ++
 linux-headers/asm-s390/unistd_32.h            |   1 +
 linux-headers/asm-s390/unistd_64.h            |   1 +
 linux-headers/asm-x86/kvm.h                   |   3 +
 linux-headers/linux/const.h                   |   2 +-
 linux-headers/linux/kvm.h                     |  12 +-
 linux-headers/linux/psp-sev.h                 |   7 ++
 linux-headers/linux/userfaultfd.h             |  17 ++-
 linux-headers/linux/vfio.h                    |   9 ++
 16 files changed, 271 insertions(+), 16 deletions(-)