Fix deadlock with tap/tun devices for arm guests#1232

Draft

AndrewFasano wants to merge 5 commits intodevfrom taphang

+106-22

Commits on Oct 20, 2022

tap: set vhostfd passed from qemu cli to non-blocking

codomania
authored and
Andrew Fasano
committed
net: detect errors from probing vnet hdr flag for TAP devices

berrange
authored and
Andrew Fasano
committed
async: use explicit memory barriers

bonzini
authored and
Andrew Fasano
committed
bugfix: restore iothread mutex locks and unlocks
Andrew Fasano
committed
Restore more iothread mutex locks/unlocks, including asserts in locking and unlocking fns
Andrew Fasano
committed