First, I must apologize for the extremely long delay since v1 - it has been
nearly 4 years, which is unacceptable. Life circumstances intervened.
This series introduces three ACPI devices that are particularly useful
for laptop/mobile virtualization:
* Battery
* AC adapter
* Laptop lid button
Changes in v2:
--------------
Based on the feedback from Philippe Mathieu-Daudé and Michael S. Tsirkin:
* Complete redesign with dual-mode operation:
- QMP control mode (default): Devices are controlled via QMP commands,
providing deterministic behavior essential for migration and CI/testing
- Host mirroring mode (opt-in): Original sysfs/procfs monitoring behavior,
now disabled by default
* Migrated to modern QEMU ACPI architecture:
- Devices now implement ACPI_DEV_AML_IF interface
- AML generation moved from centralized acpi-build.c to device files
* Added a QMP interface:
- battery-set-state/query-battery
- ac-adapter-set-state/query-ac-adapter
- lid-button-set-state/query-lid-button
* Documentation improvements:
- Converted to .rst format
- Added examples for both QMP and "fake" sysfs/procfs testing
The dual-mode design ensures these devices are migration-safe and
deterministic by default, while still allowing host state mirroring
when explicitly requested for desktop use cases.
Use cases:
----------
1. Testing: CI systems can programmatically control power states
2. Cloud: Expose virtual battery for usage-based resource limiting
3. Desktop virtualization: Mirror host laptop state to guest (opt-in)
4. Development: Test power management without physical hardware
Example usage:
--------------
# Default QMP-controlled battery
qemu-system-x86_64 -device battery
# Mirror host battery
qemu-system-x86_64 -device battery,use-qmp=false,enable-sysfs=true
# Control via QMP
{"execute": "battery-set-state",
"arguments": {"state": {"present": true, "charging": false,
"discharging": true, "charge-percent": 42,
"rate": 500}}}
The series has been tested with Windows and Linux guests, correctly
showing battery status, AC adapter state, and lid button events in
guest UIs and triggering appropriate power management actions.
Thanks again for your patience and feedback.
Leonid.
Leonid Bloch (4):
hw/acpi: Increase the number of possible ACPI interrupts
hw/acpi: Introduce the QEMU Battery
hw/acpi: Introduce the QEMU AC adapter
hw/acpi: Introduce the QEMU lid button
MAINTAINERS | 18 +
docs/specs/acad.rst | 195 +++++++
docs/specs/battery.rst | 225 ++++++++
docs/specs/button.rst | 189 +++++++
docs/specs/index.rst | 3 +
hw/acpi/Kconfig | 12 +
hw/acpi/acad.c | 447 ++++++++++++++++
hw/acpi/battery.c | 735 +++++++++++++++++++++++++++
hw/acpi/button.c | 438 ++++++++++++++++
hw/acpi/core.c | 17 +-
hw/acpi/meson.build | 3 +
hw/acpi/trace-events | 15 +
hw/i386/Kconfig | 3 +
hw/i386/acpi-build.c | 1 +
include/hw/acpi/acad.h | 27 +
include/hw/acpi/acpi_dev_interface.h | 3 +
include/hw/acpi/battery.h | 33 ++
include/hw/acpi/button.h | 25 +
qapi/acpi.json | 171 +++++++
19 files changed, 2558 insertions(+), 2 deletions(-)
create mode 100644 docs/specs/acad.rst
create mode 100644 docs/specs/battery.rst
create mode 100644 docs/specs/button.rst
create mode 100644 hw/acpi/acad.c
create mode 100644 hw/acpi/battery.c
create mode 100644 hw/acpi/button.c
create mode 100644 include/hw/acpi/acad.h
create mode 100644 include/hw/acpi/battery.h
create mode 100644 include/hw/acpi/button.h
--
2.50.1
