Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-virtiofs-20210315...

Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-virtiofs-20210315' into staging

virtiofs and migration pull 2021-03-15

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
# gpg: Signature made Mon 15 Mar 2021 20:03:03 GMT
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert-gitlab/tags/pull-virtiofs-20210315:
  migration: Replaced qemu_mutex_lock calls with QEMU_LOCK_GUARD
  monitor: Replaced qemu_mutex_lock calls with QEMU_LOCK_GUARD
  migration/tls: add error handling in multifd_tls_handshake_thread
  migration/tls: fix inverted semantics in multifd_channel_connect
  virtiofsd: Convert some functions to return bool
  virtiofsd: Don't allow empty paths in lookup_name()
  virtiofsd: Don't allow empty filenames
  virtiofsd: Add qemu version and copyright info
  virtiofsd: Release vu_dispatch_lock when stopping queue

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>