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

[Anthony Krowiak]

The required kernel changes associated with the patch are here:

https://lore.kernel.org/linux-s390/20230530223538.279198-1-akrowiak@linux.ibm.com/

On 5/30/23 6:55 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 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.
>
> 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 +++++++++++++++++++++++++++++++++++++
>   linux-headers/linux/vfio.h |   9 +++
>   2 files changed, 122 insertions(+)