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

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

[Puneet Bakshi]

[-- Attachment #1: Type: text/plain, Size: 1141 bytes --]

Adding subject.


On Thu, Jun 12, 2014 at 8:15 PM, Puneet Bakshi <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.
>
> Regards,
> ~Puneet
>

[-- Attachment #2: Type: text/html, Size: 1843 bytes --]

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

[Christopher Covington]

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.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by the Linux Foundation.