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vhost: force vhost off for non-MSI guests
When MSI is off, each interrupt needs to be bounced through the iothread when it's set/cleared, so vhost-net causes more context switches andhigher CPU utilization than userspace virtio which handles networking in...
vhost: vhost net support
This adds vhost net device support in qemu. Will be tied to tap deviceand virtio by following patches. Raw backend is currently missing,will be worked on/submitted separately.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>...