On Thu, Oct 26, 2017 at 09:30:55 +0200, Michal Privoznik wrote: > On 10/25/2017 03:41 PM, Yalan Zhang wrote: > > Hi Amos, > > > > I'm a libvirt QE, and I can not understand the setting on libvirt.org for > > rng device. > > Could you please help to explain a little? > > (The xml in https://libvirt.org/formatdomain.html#elementsRng) > > <devices> > > <rng model='virtio'> > > <rate period="2000" bytes="1234"/> > > <backend model='random'>/dev/random</backend> > > <!-- OR --> > > <backend model='egd' type='udp'> > > *<source mode='bind' service='1234'/>* > > * <source mode='connect' host='1.2.3.4' service='1234'/>* > > </backend> > > </rng> > > </devices> > > > > How did it work with source mode='bind' and source mode='connect' together? > > It doesn't. That's just an example that you can have two types of > backend. Either the backend connects somewhere (mode='connect'), or > expect somebody to connect (mode='bind'). Just try to define domain with > that RNG, dump the XML back and see what got applied. Note that both are required to establish a bidirectional connection with UDP as configured above. For EGD you really need both directions since it's a bidirectional protocol.
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