[PATCH v2 00/10] Resolve isabus global

[Bernhard Beschow <shentey@gmail.com>]

This series resolves the global "isabus" variable and is basically a v2 of [1].
Note that the majority of the work consists of fixing ISA API calls in PIIX IDE
which implicitly rely on the usage of the isabus global.

Rather than adding an ISABus pointer in PCIIDEState as in [1] this series uses
a qemu_irq array which is roughly the approach outlined in [2]. Moreover, this
series considers backwards compatibility for user-created PIIX IDE
"Frankensten" devices by fishing out TYPE_ISA_BUS from the QOM tree inside
the PIIX IDE device model. This hack can be removed again once a deprecation
period of user-createable PIIX IDE devices is over. This deprecation wasn't
announced yet but now might be a good time.

This series is structured as follows: The first three patches massage the ISA
code for patch 8. Patches 4-8 change the PIIX IDE device models to not use the
isabus global implicitly. Finally, the last two patches clan up and remove the
isabus singleton.

Based-on: <20230109172347.1830-1-shentey@gmail.com>
          'Consolidate PIIX south bridges'

v2:
- Big rework sticking closer to [1], giving it more credit and reusing one patch
- Add io port cleanup
- Rebase onto [4] so changes to PIIX could be done once and centrally

Testing done:
* `make check`
* `./qemu-system-x86_64 -M x-remote -device piix3-ide` still fails gracefully with
  `qemu-system-x86_64: -device piix3-ide: No ISA bus found while piix3-ide requires one`
* `qemu-system-x86_64 -M pc -m 2G -cdrom manjaro-kde-21.3.2-220704-linux515.iso`
* `qemu-system-x86_64 -M q35 -m 2G -device piix4-ide -cdrom \
   manjaro-kde-21.3.2-220704-linux515.iso`
* `qemu-system-mips64el -M malta -kernel vmlinux-3.2.0-4-5kc-malta -hda \
  debian_wheezy_mipsel_standard.qcow2 -append "root=/dev/sda1 console=ttyS0"`

[1] https://patchew.org/QEMU/20210518215545.1793947-1-philmd@redhat.com/
[2] https://lists.nongnu.org/archive/html/qemu-devel/2020-03/msg01707.html
[3] https://people.debian.org/~aurel32/qemu/mips/
[4] https://patchew.org/QEMU/20230109172347.1830-1-shentey@gmail.com/

Bernhard Beschow (9):
  softmmu/ioport: Move portio_list_init() in front of portio_list_add()
  softmmu/ioport: Merge portio_list_add() into portio_list_init()
  softmmu/ioport: Remove unused functions
  hw/ide/piix: Disuse isa_get_irq()
  Revert "hw/ide: Fix crash when plugging a piix3-ide device into the
    x-remote machine"
  hw/ide/pci: Add PCIIDEState::isa_irqs[]
  hw/ide/piix: Require an ISABus only for user-created instances
  hw/ide: Let ide_init_ioport() take a MemoryRegion argument instead of
    ISADevice
  hw/isa/isa-bus: Resolve isabus global

Philippe Mathieu-Daudé (1):
  hw/isa: Remove use of global isa bus

 include/exec/ioport.h     |  8 ++---
 include/hw/ide/internal.h |  3 +-
 include/hw/ide/pci.h      |  2 ++
 include/hw/isa/isa.h      | 15 ++++----
 hw/audio/adlib.c          |  4 +--
 hw/display/qxl.c          |  5 ++-
 hw/display/vga.c          |  8 ++---
 hw/dma/i82374.c           |  6 ++--
 hw/ide/ioport.c           | 19 +++++-----
 hw/ide/isa.c              |  4 ++-
 hw/ide/piix.c             | 75 +++++++++++++++++++++++++++++++--------
 hw/isa/isa-bus.c          | 54 +++++++++++++++-------------
 hw/isa/piix.c             |  5 +++
 hw/watchdog/wdt_ib700.c   |  4 +--
 softmmu/ioport.c          | 70 +++++++++++-------------------------
 15 files changed, 149 insertions(+), 133 deletions(-)

-- 
2.39.1