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Re: [libvirt] [PATCHv2 5/8] qemu: Implement support for default 'random' backend for virtio-rng



On 02/21/2013 07:47 AM, Peter Krempa wrote:
> This patch implements support for the virtio-rng-pci device and the
> rng-random backend in qemu.
> 
> Two capabilities bits are added to track support for those:
> 
> QEMU_CAPS_DEVICE_VIRTIO_RNG - for the device support and
> QEMU_CAPS_OBJECT_RNG_RANDOM - for the backend support.

Is there ever going to be a qemu with backend support but not the
device?  I guess the opposite is possible though - having the device,
but being built with only one backend out of a set of backends available
in qemu source code.  I guess keeping this as two capability bits makes
sense.

> 
> qemu is invoked with these additional parameters if the device is
> enabled:
> 
> -object rng-random,id=rng0,filename=/test/phile (to add the backend)
> -device virtio-rng-pci,rng=rng0,bus=pci.0,addr=0x4 (to add the device)
> ---
> 
> Notes:
>     Version 2:
>     - don't use different error messages for similar issues

ACK.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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