On 8/31/20 6:16 AM, Cindy Lu wrote:
On Mon, 31 Aug 2020 at 16:30, Jason Wang <[email protected]> wrote:
This patch allows to initialize vhost-vdpa network backend with pre
opened vhost-vdpa file descriptor. This is useful for running
unprivileged qemu through libvirt.
Cc: Eric Blake <[email protected]>
Cc: Markus Armbruster <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
---
+++ b/qapi/net.json
@@ -442,12 +442,15 @@
# @queues: number of queues to be created for multiqueue vhost-vdpa
# (default: 1)
#
+# @fd: file descriptor of an already opened vhost-vdpa (since 5.2)
+#
# Since: 5.1
##
{ 'struct': 'NetdevVhostVDPAOptions',
'data': {
'*vhostdev': 'str',
- '*queues': 'int' } }
+ '*queues': 'int',
+ '*fd': 'str' } }
##
# @NetClientDriver:
--
2.20.1
I think the latest code supported this part.
you can pass a pre open file descriptor to it via the add-fd QMP
command to /dev/fdset/NNN, and then pass the string
"/dev/fdset/NNN" as vhostdev. so we don't need a special fd parameter here.
Correct - the 'vhostdev' parameter + magic filename is all the more that
is needed to access a pre-opened fd, so no 'fd' parameter should be added.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
