Re: [Qemu-devel] [PATCH 0/6] refactor PC machine, i440fx and piix3 to take advantage of QOM

["Andreas Färber" <afaerber@suse.de>]

Am 26.03.2012 04:06, schrieb Wanpeng Li:
> From: Anthony Liguori <aliguori@us.ibm.com>

Resending an old cover letter is not a good idea. This looks like a v2,
so please mark it as such in the subjects; it's missing a Change Log
against Anthony's version. I take it, some patches were dropped?

> This series aggressively refactors the PC machine initialization to be more
> modelled and less ad-hoc.  The highlights of this series are:
> 
>  1) Things like -m and -bios-name are now device model properties
> 
>  2) The i440fx and piix3 are now modelled in a thorough fashion
> 
>  3) Most of the chipset features of the piix3 are modelled through composition
> 
>  4) i440fx_init is trivialized to creating devices and setting properties
> 
>  5) convert MemoryRegion to QOM
> 
>  6) convert PCI host bridge to QOM
> 
> The point (4) is the most important one.  As we refactor in this fashion,
> we should quickly get to the point where machine->init disappears completely in
> favor of just creating a handful of devices.

I agree that machine->init needs to be refactored, however I don't think
it'll disappear, just be moved into initfn/realize functions.

Andreas

> 
> The two stage initialization of QOM is important here.  instance_init() is when
> composed devices are created which means that after you've created a device, all
> of its children are visible in the device model.  This lets you set properties
> of the parent and its children.
> 
> realize() (which is still called DeviceState::init today) will be called right
> before the guest starts up for the first time.
> 
> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
> Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com>
> 
> ---
>  Makefile.target     |    3 +-
>  hw/hpet.c           |   39 +---
>  hw/hpet_emul.h      |   41 +++
>  hw/i440fx.c         |  431 ++++++++++++++++++++++++++
>  hw/i440fx.h         |   78 +++++
>  hw/i8254_internal.h |    2 +-
>  hw/mc146818rtc.c    |   26 --
>  hw/mc146818rtc.h    |   29 ++
>  hw/pc.c             |  838 +++++++++++++++++++++++++++++++++++++++++++++------
>  hw/pc.h             |   46 +---
>  hw/pc_piix.c        |  762 ----------------------------------------------
>  hw/pci_host.c       |   26 ++
>  hw/pci_host.h       |    5 +
>  hw/piix3.c          |  274 +++++++++++++++++
>  hw/piix3.h          |   79 +++++
>  hw/piix_pci.c       |  600 ------------------------------------
>  memory.c            |   94 +++++--
>  memory.h            |    8 +
>  18 files changed, 1795 insertions(+), 1586 deletions(-)
>  create mode 100644 hw/i440fx.c
>  create mode 100644 hw/i440fx.h
>  delete mode 100644 hw/pc_piix.c
>  create mode 100644 hw/piix3.c
>  create mode 100644 hw/piix3.h
>  delete mode 100644 hw/piix_pci.c
> --

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