linux-kernel - Re: [PATCH v4 0/3] Add support for clean shutdown with MSHV

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Message-ID: <8a8a7118-233b-468d-b8e9-43312cb11483@linux.microsoft.com>
Date: Thu, 13 Nov 2025 11:26:31 -0800
From: Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>
To: Praveen K Paladugu <prapal@...ux.microsoft.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
 linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, arnd@...db.de,
 easwar.hariharan@...ux.microsoft.com, anbelski@...ux.microsoft.com,
 nunodasneves@...ux.microsoft.com, skinsburskii@...ux.microsoft.com,
 mhklinux@...look.com
Subject: Re: [PATCH v4 0/3] Add support for clean shutdown with MSHV

On 11/7/2025 2:16 PM, Praveen K Paladugu wrote:
> Add support for clean shutdown of the root partition when running on
> MSHV Hypervisor.
> 
> 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       |  9 +++
>  arch/x86/include/asm/mshyperv.h |  4 ++
>  drivers/hv/mshv_common.c        | 99 +++++++++++++++++++++++++++++++++
>  include/hyperv/hvgdk_mini.h     |  4 +-
>  include/hyperv/hvhdk_mini.h     | 33 +++++++++++
>  5 files changed, 148 insertions(+), 1 deletion(-)
> 
For the series, modulo the lkp complaint about unused status in hv_machine_power_off()

Reviewed-by: Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>