Re: [Qemu-devel] [QEMU guest agent] How to transfer file from host to guest and do some operation on that

[Christopher Covington <cov@codeaurora.org>]

On 06/12/2014 10:47 AM, Puneet Bakshi wrote:
> Adding subject.
> 
> 
> On Thu, Jun 12, 2014 at 8:15 PM, Puneet Bakshi <bakshi.puneet@gmail.com
> <mailto:bakshi.puneet@gmail.com>> wrote:
> 
>     Hi,
> 
>     I want to be able to install RPM packages (available in host system at
>     some path) to the online guest VM and want this facility to be available
>     as a tool.
> 
>     I am thinking of having a gemu guest agent (qemu-ga) running inside guest
>     VM. I did not find any available command ("virsh qemu-agent-command
>     <guest_vm> ...") which can do the same.
> 
>     I am planning to implement a command in qemu guest agent, which I can
>     invoke from virsh like below.
> 
>         "virsh qemu-agent-command vm_01          \
>             '{"execute":"guest-rpm-
>     install",     \
>               "arguments":{"path":"/usr/local/bin/ABC.rpm"}}
>         
>     I am able to pass arguments from host to guest VM but how am I supposed to
>     pass the whole RPM image from host to guest (which the guest agent can
>     receive and install)?
> 
>     Basically, I want to know how can we do following in QEMU environment.
> 
>         1. take some bulky file from host to guest
>         2. perform some operation on that file
>         3. get the result of that operation.

I like the VirtIO-9P passthrough filesystem for accessing host files from the
guest.

http://www.linux-kvm.org/page/9p_virtio

(On ARM I've also used Angel semihosting, but you have to rip out some
security checks to get it to work from userspace.)

Christopher

-- 
Employee of Qualcomm Innovation Center, Inc.
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