Re: [Qemu-devel] [PATCH] xen: make xen-platform a default device

[Stefano Stabellini]

On Thu, 22 May 2014, Gerd Hoffmann wrote:
>   Hi,
> 
> > Given that libxl always passes -nodefaults to QEMU, this patch is going
> > to effectively disable xen_platform_pci for all Xen users. It is not a
> > good idea. With the patch applied a Xen user would have no way to enable
> > xen_platform_pci except for passing some magic command line runes via
> > device_model_args_hvm.
> 
> Indeed.
> 
> > > @@ -4101,6 +4103,7 @@ int main(int argc, char **argv, char **envp)
> > >          default_monitor = 0;
> > >          default_net = 0;
> > >          default_vga = 0;
> > > +        default_xenplatform = 0;
> > >      }
> 
> With that chunk removed -nodefaults will have no effect for the xen
> platform device, but explicitly moving it somewhere else via -device
> xen-platform,addr=$slot should still work.

That could work.