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[Qemu-devel] Simultaneous vhostfds= and ifname= options

From: Michał Dubiel
Subject: [Qemu-devel] Simultaneous vhostfds= and ifname= options
Date: Fri, 15 Apr 2016 18:50:18 +0200

Hi guys,

Qemu does not allow currently to use vhostfds= and ifname= options of -netdev tap... at the same time. In order to use vhostfds=, you have to also use fds= instead. May ask you what is rationale behind that?

I am asking as we need this for the OpenContrail vRouter multiqueue support. We are passing name of previously created tap, and vhost-net device descriptors (which are supplied by the libvirt).

Actually I have internally a very simple patch that allows for simultaneous vhostfds= and ifname=. All seems to work fine with this, but perhaps there is something I do not know and this combination of options indeed should not be allowed.

If there is no issues with allowing for that, I could contribute it.


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