Re: [Qemu-devel] [PATCH v5 0/8] modify boot order of guest, and take effect after rebooting

[Gerd Hoffmann <kraxel@redhat.com>]

On Di, 2014-08-26 at 09:07 +0000, Gonglei (Arei) wrote:
> Hi, Gerd
> 
>  Nice to meet you again in maillist. :)
> 
> > -----Original Message-----
> > From: Gerd Hoffmann [mailto:kraxel@redhat.com]
> > Sent: Tuesday, August 26, 2014 2:36 PM
> > Subject: Re: [PATCH v5 0/8] modify boot order of guest, and take effect after
> > rebooting
> > 
> > > The patchsets add one qmp interface, and add an fw_cfg_machine_reset()
> > > to achieve it.
> > 
> > > (qemu) set-bootindex ide0-0-1 1
> > > The bootindex 1 has already been used
> > 
> > What happened to the idea to use qom-set instead?  I liked that
> > suggestion.  Solves the suffix issue in a nice way.
> > 
> I have discussed with Makus about qom-set in pervious confabulation.
> The main problem is that qom-set's function is simple, which just change
> a device's property value, but not can do any other logic. In my case,
> I should change global fw_boot_orde for devices's bootindex taking effect.

Two options (also mentioned in the thread):

  (1) Set/update bootindex on reset instead of realize/init.
  (2) Switch the property from qdev to qom, then use the set
      callback to also update the fw_cfg file.

cheers,
  Gerd