[Qemu-devel] [Bug 1502613] Re: [Feature Request] Battery Status / Virtual Battery

[Naftaly Avadiaev]

I'm trying to add virtual battery to QEMU. More specifically, if the
HOST is running on battery power [laptop] I want to pass this knowledge
to GUEST.

I have looked at ACPI folder within QEMU source code, however was unable
to find the specific place where I can add this functionality.

Can someone provide me with general roadmap of what should I do and
where I should start? I suspect that changing the QEMU source code will
not be enough and I will also have to implement a driver for the GUEST.

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https://bugs.launchpad.net/bugs/1502613

Title:
  [Feature Request] Battery Status / Virtual Battery

Status in QEMU:
  New

Bug description:
  When using virtualization on notebooks heavily then virtual machines
  do not realize that they're running on a notebook device causing high
  power consumption because they're not switching into a optimized
  "laptop mode". This leads to the circumstance that they are trying to
  do things like defragmentation / virtus scan / etc. while the host is
  still running on batteries.

  So it would be great if QEMU / KVM would have support for emulating
  "Virtual Batteries" to guests causing them to enable power-saving
  options like disabling specific services / devices / file operations
  automatically by OS.

  Optionally a great feature would be to set virtual battery's status
  manually. For example: Current charge rate / charging / discharging /
  ...

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