Re: [libvirt] [PATCH 0/2] Enable QEMU_CAPS_PCI_ROMBAR unconditionally

[Pavel Hrdina <phrdina redhat com>]

On Fri, May 13, 2016 at 03:47:57PM +0200, Andrea Bolognani wrote:
> This capability was not handled correctly, causing aarch64
> guests having
> 
>   <interface type='network'>
>     ...
>     <rom bar='off'/>
>   </interface>
> 
> to fail at startup with
> 
>   error: unsupported configuration: rombar and romfile not
>          supported in this QEMU binary
> 
> I'm not sure whether we should drop the QEMU_CAPS_PCI_ROMBAR
> capability entirely now that it's enabled unconditionally and
> there is no code checking for it; as I understand it, we don't
> ever drop capabilities, hence the current implementation.

We cannot drop capabilities, but you can rename that capability to
X_QEMU_CAPS_PCI_ROMBAR and don't even set that capability.  Check the
src/qemu/qemu_capabilities.h, there is a lot of those X_* capabilities.  Even
though you have already ACKs for this series, I would suggest to send a v2 and
use X_QEMU_CAPS_PCI_ROMBAR.

Pavel