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

[Gonglei (Arei)]

> From: Markus Armbruster [mailto:address@hidden
> Sent: Tuesday, August 26, 2014 7:25 PM
> Subject: Re: [Qemu-devel] [PATCH v5 0/8] modify boot order of guest, and take
> effect after rebooting
> 
> Gerd Hoffmann <address@hidden> writes:
> 
> > 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:address@hidden
> >> > 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.
> 
> Yes, please.  Even if it should make the implementation a bit more
> complex.  Avoiding new ways to name things in external interfaces, such
> as the suffix here, is worth some complication.

OK, thanks, guys. I will work for this. 

And I have two questions:

1. Does have ready-to-wear interface to get QOM path by qdev id,?
2. Can I make bootindex property in QDEV coexist with in QOM? I think this 
meathod
will be good for compatibility with previous. 

Thanks for any suggestions!

Best regards,
-Gonglei