Re: [PATCH 00/11] QOM'ify PIIX3 southbridge

[BB <shentey@gmail.com>]

Am 26. Juli 2022 16:53:03 MESZ schrieb "Michael S. Tsirkin" <mst@redhat.com>:
>On Wed, Jul 13, 2022 at 10:17:24AM +0200, Bernhard Beschow wrote:
>> Similar to PIIX4 this series QOM'ifies internal device creation for PIIX3.
>> This reduces the delta between the implementations of PIIX3 and PIIX4 and
>> therefore might allow to merge both implementations in the future.
>> 
>> There were two challenges in this series:
>> 
>> First, QEMU considers the ACPI and USB functions to be optional in PIIX3.
>> When instantiating those with object_initialize_child(), they need to be
>> unparented in the realize function to prevent an assertion (see respective
>> commit messages).
>> 
>> Second, the PIC used to be instantiated outside of the southbridge while
>> some sub functions require a PIC with populated qemu_irqs. This has been
>> solved by introducing a proxy PIC which furthermore allows PIIX3 to be
>> agnostic towards the virtualization technology used (KVM, TCG, Xen).
>
>Thanks!
>I think it's best to merge this after the 7.1 release.
>I'll tag this but if possible pls also ping me after the release
>to make sure I don't forget. Thanks!

Sure!
I'm extending the scope of this series to go all the way to consolidate the piix 3 + 4 southbridges which is why I didn't post a v2 yet. The extended series will also address Peter's comments.

Thanks,
Bernhard

P.S.:
I've got a working POC where PIIX4 rather than PIIX3 is used in the "pc" machine which also supports KVM accelleration: https://github.com/shentok/qemu/commits/pc-piix4

>
>> Testing done:
>> * make check
>> * make check-avocado
>> * Boot live CD:
>>   * qemu-system-x86_64 -M pc -m 2G -accel kvm -cpu host -cdrom manjaro-kde-21.3.2-220704-linux515.iso
>>   * qemu-system-x86_64 -M q35 -m 2G -accel kvm -cpu host -cdrom manjaro-kde-21.3.2-220704-linux515.iso
>> 
>> Bernhard Beschow (11):
>>   hw/i386/pc: QOM'ify DMA creation
>>   hw/i386/pc_piix: Allow for setting properties before realizing PIIX3
>>     southbridge
>>   hw/isa/piix3: QOM'ify USB controller creation
>>   hw/isa/piix3: QOM'ify ACPI controller creation
>>   hw/i386/pc: QOM'ify RTC creation
>>   hw/i386/pc: No need for rtc_state to be an out-parameter
>>   hw/intc/i8259: Introduce i8259 proxy "isa-pic"
>>   hw/isa/piix3: QOM'ify ISA PIC creation
>>   hw/isa/piix3: QOM'ify IDE controller creation
>>   hw/isa/piix3: Wire up ACPI interrupt internally
>>   hw/isa/piix3: Remove extra ';' outside of functions
>> 
>>  hw/i386/Kconfig               |  1 -
>>  hw/i386/pc.c                  | 17 ++++---
>>  hw/i386/pc_piix.c             | 70 ++++++++++++++++-------------
>>  hw/i386/pc_q35.c              |  3 +-
>>  hw/intc/i8259.c               | 27 +++++++++++
>>  hw/isa/Kconfig                |  1 +
>>  hw/isa/lpc_ich9.c             | 11 +++++
>>  hw/isa/piix3.c                | 84 ++++++++++++++++++++++++++++++++---
>>  include/hw/i386/ich9.h        |  2 +
>>  include/hw/i386/pc.h          |  2 +-
>>  include/hw/intc/i8259.h       | 14 ++++++
>>  include/hw/southbridge/piix.h | 16 ++++++-
>>  12 files changed, 201 insertions(+), 47 deletions(-)
>> 
>> -- 
>> 2.37.1
>> 
>