If I add following channel in guest VM's xml file
<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/f16x86_64.agent'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
Would it be possible to use virtio org.qemu.guest_agent.0 for such
communication between host and guest? If yes, how can we do it?
Regards,
~Puneet
On Thu, Jun 12, 2014 at 8:20 PM, Eric Blake <[email protected]> wrote:
> On 06/12/2014 08:38 AM, Puneet Bakshi wrote:
> > Thanks for responding.
>
> [Please don't top-post on technical lists]
>
> >
> > Since I want to work with online guests, unfortunately libguestfs is not
> an
> > option for me. (Otherwise, I might have used virt-copy-in to copy the
> files
> > into guest).
> >
> > But, for my understanding, please let me know how such things can be done
> > in QEMU environment. Basically, how can we do following.
> >
> > 1. take some bulky file from host to guest
>
> Place the file in a shared filesystem (NFS, gluster, ...) that both the
> host and guest can see. Depending on whether you use a new enough host
> and guest kernel, you can even try plan9 9p filesystem passthrough. Or
> you can use qemu MTP MTP filesystem passthrough (which has the bonus of
> being supported out-of-the-box for Windows guests):
> https://lists.gnu.org/archive/html/qemu-devel/2014-04/msg03319.html
> https://en.wikipedia.org/wiki/Media_Transfer_Protocol
> although I'm not sure if libvirt needs to be taught to expose that better.
>
> > 2. perform some operation on that file
> > 3. get the result of that operation.
>
> How would you get a bare-metal machine to perform an operation on a file
> it just downloads? If you would ssh in to a bare-metal machine, then
> ssh into your guest. Otherwise, you'll have to submit patches to the
> qemu list to enhance the guest agent to do what you want before libvirt
> can even consider adding things to automate yet another way of doing it.
>
> --
> Eric Blake eblake redhat com +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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