[PATCH v3 0/6] X86: Alias isa-bios area and clean up

[Bernhard Beschow <shentey@gmail.com>]

This series changes the "isa-bios" MemoryRegion to be an alias rather than a
copy in the pflash case. This fixes issuing pflash commands in the isa-bios
region which matches real hardware and which some real-world legacy bioses I'm
running rely on. Furthermore, aliasing in the isa-bios area is already the
current behavior in the bios (a.k.a. ROM) case, so this series consolidates
behavior.

For migration compatibility the aliasing is only performed on new versions of
the q34 and pc machine types.

v3:
* Amend commit message with a diff of `info mtree` (Phil)
* Add comments for bios memory regions (Phil)

v2:
* Don't leak bios memory regions (Phil)
* Add compat machinery (Michael)

Testing done:
* `make check` with qemu-system-x86_64 (QEMU 8.2.2) installed. All tests
  including migration tests pass.
* `make check-avocado`

Best regards,
Bernhard

Bernhard Beschow (6):
  hw/i386/x86: Eliminate two if statements in x86_bios_rom_init()
  hw/i386: Have x86_bios_rom_init() take X86MachineState rather than
    MachineState
  hw/i386/x86: Don't leak "isa-bios" memory regions
  hw/i386/x86: Don't leak "pc.bios" memory region
  hw/i386/x86: Extract x86_isa_bios_init() from x86_bios_rom_init()
  hw/i386/pc_sysfw: Alias rather than copy isa-bios region

 include/hw/i386/pc.h  |  1 +
 include/hw/i386/x86.h | 17 +++++++++++++++-
 hw/i386/microvm.c     |  2 +-
 hw/i386/pc.c          |  1 +
 hw/i386/pc_piix.c     |  3 +++
 hw/i386/pc_q35.c      |  2 ++
 hw/i386/pc_sysfw.c    | 17 ++++++++++------
 hw/i386/x86.c         | 45 ++++++++++++++++++++++---------------------
 8 files changed, 58 insertions(+), 30 deletions(-)

-- 
2.45.0