Add support for clean shutdown of the root partition when running on
MSHV Hypervisor.

v6:
 - Fixed build errors, by adding CONFIG_X86_64 guard
 - Moved machine_ops hook definition to ms_hyperv_init_platform
 - Addressed review comments in v5

v5:
 - Fixed build errors
 - Padded struct hv_input_set_system_property for alignment
 - Dropped CONFIG_ACPI stub

v4:
 - Adopted machine_ops to order invoking HV_ENTER_SLEEP_STATE as the
   last step in shutdown sequence.
 - This ensures rest of the cleanups are done before powering off

v3:
 - Dropped acpi_sleep handlers as they are not used on mshv
 - Applied ordering for hv_reboot_notifier
 - Fixed build issues on i386, arm64 architectures

v2:
  - Addressed review comments from v1.
  - Moved all sleep state handling methods under CONFIG_ACPI stub
  - - This fixes build issues on non-x86 architectures.


Praveen K Paladugu (3):
  hyperv: Add definitions for MSHV sleep state configuration
  hyperv: Use reboot notifier to configure sleep state
  hyperv: Cleanly shutdown root partition with MSHV

 arch/x86/hyperv/hv_init.c       |  1 +
 arch/x86/include/asm/mshyperv.h |  4 ++
 arch/x86/kernel/cpu/mshyperv.c  |  2 +
 drivers/hv/mshv_common.c        | 98 +++++++++++++++++++++++++++++++++
 include/hyperv/hvgdk_mini.h     |  4 +-
 include/hyperv/hvhdk_mini.h     | 40 ++++++++++++++
 6 files changed, 148 insertions(+), 1 deletion(-)

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2.51.0