vhost: Problem RESET_OWNER processing

[Jan Kiszka <jan.kiszka@siemens.com>]

Hi,

I was wondering if I'm alone with this: the vhost-switch example crashes
on client disconnects if the client send a RESET_OWNER message. That's
at least the case for QEMU and vhost-user mode (I suppose vhost-cuse is
legacy now). And it really ruins the party when playing with this
because every VM shutdown or guest reboot triggers.

I was looking deeper in the librte_vhost, and I found that reset_owner()
is doing cleanup_device and then init_device - but without letting the
user know. So vhost-switch crashed in its main loop over continuing to
use the device, namely calling rte_vhost_dequeue_burst (with
dev->virtqueue[]->avail == NULL).

Do we simply need another hook in the vhost API, similar to the
destruction notification?

Jan

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