qemu-e2k/docs/interop
Stefan Hajnoczi df98d7ccc2 docs: clarify multiqueue vs multiple virtqueues
The vhost-user specification does not explain when
VHOST_USER_PROTOCOL_F_MQ must be implemented.  This may lead
implementors of vhost-user masters to believe that this protocol feature
is required for any device that has multiple virtqueues.  That would be
a mistake since existing vhost-user slaves offer multiple virtqueues but
do not advertise VHOST_USER_PROTOCOL_F_MQ.

For example, a vhost-net device with one rx/tx queue pair is not
multiqueue.  The slave does not need to advertise
VHOST_USER_PROTOCOL_F_MQ.  Therefore the master must assume it has these
virtqueues and cannot rely on askingt the slave how many virtqueues
exist.

Extend the specification to explain the different between true
multiqueue and regular devices with a fixed virtqueue layout.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20190624091304.666-1-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2019-07-25 04:17:34 -04:00
..
bitmaps.rst docs/bitmaps: use QMP lexer instead of json 2019-07-10 15:08:07 -04:00
conf.py docs: Provide separate conf.py for each manual we want 2019-03-07 14:26:46 +00:00
firmware.json docs/interop/firmware.json: Prefer -machine to if=pflash 2019-03-11 22:54:25 +01:00
index.rst vhost-user: add vhost_user_gpu_set_socket() 2019-05-29 06:29:07 +02:00
live-block-operations.rst Remove the deprecated -nodefconfig option 2018-08-31 09:52:46 +02:00
nbd.txt nbd: Document timeline of various features 2019-01-04 17:41:28 -06:00
parallels.txt
pr-helper.rst scsi: build qemu-pr-helper 2017-09-22 21:07:24 +02:00
prl-xml.txt docs/interop/prl-xml: description of Parallels Disk format 2018-01-22 14:02:33 +00:00
qcow2.txt docs/interop/qcow2: Improve bitmap flag in_use specification 2019-03-12 12:06:11 -04:00
qed_spec.txt
qemu-ga-ref.texi
qemu-qmp-ref.texi
qmp-intro.txt docs/interop/qmp: Improve OOB documentation 2018-07-03 23:09:31 +02:00
qmp-spec.txt docs: Update references to JSON RFC 2018-12-13 19:10:06 +01:00
vhost-user-gpu.rst vhost-user: add vhost_user_gpu_set_socket() 2019-05-29 06:29:07 +02:00
vhost-user.json docs/vhost-user.json: some firmware.json copy leftovers 2019-06-16 16:16:52 -04:00
vhost-user.rst docs: clarify multiqueue vs multiple virtqueues 2019-07-25 04:17:34 -04:00
vnc-ledstate-Pseudo-encoding.txt