Re: How to load QEMU Firmware Configuration Device in virt-manager?

[Narunas Krasauskas <narun4sk@xxxxxxxxx>]

Hi Pavel,

I've found a blog post, which claims otherwise, here's excerpt from it:

The <qemu:commandline> domain XML tag

There is a special namespace for QEMU-specific tags in libvirt domain XML. You
cannot use QEMU-specific tags without first declaring the namespace. To enable
it use the following:

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

Now you can add command-line arguments to the QEMU invocation. For example, to load an option ROM with -option-rom:

<qemu:commandline>
   <qemu:arg value='-option-rom'/>
   <qemu:arg value='path/to/my.rom'/>
</qemu:commandline>

It is also possible to add environment variables to the QEMU invocation:

<qemu:commandline>
   <qemu:env name='MY_VAR' value='my_value'/>
</qemu:commandline>

Can you please comment regarding this approach?

Regards

Narunas

On Tue, Jun 20, 2017 at 10:44 AM, Pavel Hrdina <phrdina@xxxxxxxxxx> wrote:

On Tue, Jun 20, 2017 at 10:20:01AM +0100, Narunas Krasauskas wrote:
> Is there a way to load *fw_cfg* file in *virt-manager* (v1.4.1)?
>
> On the plain *QEMU* command line I can do it like so:
>
> -fw_cfg name=opt/com.coreos/config,file=some/file.json
>
> I cannot find equivalent option in the *virt-manager*.
>
> Thanks, Narunas

Hi, no there is no way to use *fw_cfg* in virt-manager.  Virt-manager
controls libvirt an this is not even implemented in libvirt.

To allow setting it via virt-manager/virt-xml/virt-install it needs
to be implemented in libvirt as well.

Feel free to create a Bug to track this feature, both libvirt and
virt-manager uses this site to track bugs [1].  As a product you should
select "Virtualization Tools" and component is libvirt or virt-manager.

Pavel

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