[PATCH 0/4] 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.

The consolidateion results in duplicate code which is resolved in the second
half (patches 3 and 4) in this series.

Question: AFAIU, patch 2 changes the behavior for SEV-enabled guests since the
isa-bios area is now encrypted. Does this need compat machinery or is it a
bugfix?

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 (4):
  hw/i386/pc_sysfw: Remove unused parameter from pc_isa_bios_init()
  hw/i386/pc_sysfw: Alias rather than copy isa-bios region
  hw/i386/x86: Eliminate two if statements in x86_bios_rom_init()
  hw/i386: Consolidate isa-bios creation

 include/hw/i386/x86.h |  2 ++
 hw/i386/pc_sysfw.c    | 38 ++++----------------------------------
 hw/i386/x86.c         | 35 +++++++++++++++++++----------------
 3 files changed, 25 insertions(+), 50 deletions(-)

-- 
2.44.0