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From: John Nielsen <lists@jnielsen.net>
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Subject: Using virtio_random
Date: Mon, 15 Sep 2014 17:17:39 -0600
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Cc: Bryan Venteicher <bryanv@freebsd.org>
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Hi all-

I am happy to see that virtio_random(4) will be included in FreeBSD =
10.1. To try it out, I loaded up BETA1 in a virtual machine with entropy =
passthrough enabled. After booting it with the virtio_random module =
loaded I see this in dmesg:

virtio_pci3: <VirtIO PCI Entropy adapter> port 0xc0a0-0xc0bf irq 10 at =
device 6.0 on pci0                                                       =
                                            =20
vtrnd0: <VirtIO Entropy Adapter> on virtio_pci3                          =
                                                                         =
                                          =20
virtio_pci3: host features: 0x71000000 =
<EventIdx,RingIndirect,NotifyOnEmpty>                                    =
                                                                         =
   =20
virtio_pci3: negotiated features: 0                                      =
                                                                         =
                                          =20

So far, so good. (I think? The 'negotiated features: 0' gives me =
pause..)

Now how do I use the driver as an entropy source (or verify that it's =
being used)? I don't see any difference in the output of "sysctl =
kern.random" with or without the driver loaded. Is something missing?

Thanks,

JN