[PATCH V3 0/4] acpi: Add machine option to disable SPCR table

[Li Chen <me@linux.beauty>]

This series introduces a new machine option, spcr=on|off, allowing users
to disable the ACPI SPCR (Serial Port Console Redirection) table.
By default, SPCR is enabled. Disabling it can help ensure that the guest's
console behavior is determined solely by kernel command-line parameters
on arch like arm64, avoiding unintended serial console configurations imposed
 by firmware.

Also add tests on AArch64 and RISC-V virt machines using TCG and UEFI boot.

Changes since v2:
- Omit UART device from DSDT and SPCR construction if no serial device is present,
  as suggested by Philippe Mathieu-Daudé.
- Add Reviewed-by from Gavin Shan <gshan@redhat.com> for the first patch and fix style issue.

Changes since v1:
- Add bios-tables-test for RISC-V and ARM as suggested by 
- Add Acked-by from Michael S. Tsirkin for the first patch
- Add Reviewed-by from Bibo Mao for the first patch

Li Chen (4):
  acpi: Add machine option to disable SPCR table
  tests/qtest/bios-tables-test: Add test for disabling SPCR on AArch64
  tests/qtest/bios-tables-test: Add test for disabling SPCR on RISC-V
  acpi/virt: suppress UART device & SPCR when guest has no serial
    hardware

 hw/arm/virt-acpi-build.c       | 18 ++++++++++-----
 hw/core/machine.c              | 22 ++++++++++++++++++
 hw/loongarch/virt-acpi-build.c |  4 +++-
 hw/riscv/virt-acpi-build.c     |  9 ++++++--
 include/hw/boards.h            |  1 +
 include/system/system.h        |  2 ++
 qemu-options.hx                |  5 ++++
 system/vl.c                    |  5 ++++
 tests/qtest/bios-tables-test.c | 42 ++++++++++++++++++++++++++++++++++
 9 files changed, 99 insertions(+), 9 deletions(-)

-- 
2.49.0