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Revision 5430a28f

ID5430a28fe452907c9e1b2097e073bc1ea4b29f39

Added by mst@redhat.com over 10 years ago

vhost: force vhost off for non-MSI guests

When MSI is off, each interrupt needs to be bounced through the io
thread when it's set/cleared, so vhost-net causes more context switches and
higher CPU utilization than userspace virtio which handles networking in
the same thread.

We'll need to fix this by adding level irq support in kvm irqfd,
for now disable vhost-net in these configurations.

Added a vhostforce flag to force vhost-net back on.

Signed-off-by: Michael S. Tsirkin <>
Signed-off-by: Anthony Liguori <>

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