Re: [libvirt] Supporting vhost-net and macvtap in libvirt for QEMU
On Thu, Dec 17, 2009 at 02:32:32PM -0800, Chris Wright wrote:
The reason I brought it up here is in case libvirt would be doing
both.
/dev/vhost takes an fd for a tap device or raw socket. So libvirt would
need to open both, and then becomes a question of whether libvirt only
passes the single vhost fd (after setting it up completely) or passes
both the vhost fd and connecting fd for qemu to put the two together.
I didn't recall migration (if qemu would need tap fd again).
libvirt should open both fds, pass them to qemu and qemu will
put them together: since vhost might potentially perform direct access
anywhere in guest memory, it would not be safe to let management
control it, so vhost does not let you do it.
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MST