linux-kernel - Re: [PATCH v6 2/3] hyperv: Use reboot notifier to configure sleep state

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Message-ID: <aTBvqqdxH-C7tOq2@gmail.com>
Date: Wed, 3 Dec 2025 18:13:14 +0100
From: Ingo Molnar <mingo@...nel.org>
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, anbelski@...ux.microsoft.com,
	easwar.hariharan@...ux.microsoft.com,
	nunodasneves@...ux.microsoft.com, skinsburskii@...ux.microsoft.com
Subject: Re: [PATCH v6 2/3] hyperv: Use reboot notifier to configure sleep
 state

* Praveen K Paladugu <prapal@...ux.microsoft.com> wrote:

> Configure sleep state information in mshv hypervisor. This sleep state
> information from ACPI will be used by hypervisor to poweroff the host.
> 
> Signed-off-by: Praveen K Paladugu <prapal@...ux.microsoft.com>
> Co-developed-by: Anatol Belski <anbelski@...ux.microsoft.com>
> Signed-off-by: Anatol Belski <anbelski@...ux.microsoft.com>
> Reviewed-by: Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>
> ---
>  arch/x86/hyperv/hv_init.c       |  1 +
>  arch/x86/include/asm/mshyperv.h |  2 +
>  drivers/hv/mshv_common.c        | 80 +++++++++++++++++++++++++++++++++
>  3 files changed, 83 insertions(+)
> 
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index e28737ec7054..daf97a984b78 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -555,6 +555,7 @@ void __init hyperv_init(void)
>  
>  		hv_remap_tsc_clocksource();
>  		hv_root_crash_init();
> +		hv_sleep_notifiers_register();
>  	} else {
>  		hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);
>  		wrmsrq(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index 10037125099a..166053df0484 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -182,8 +182,10 @@ int hyperv_fill_flush_guest_mapping_list(
>  void hv_apic_init(void);
>  void __init hv_init_spinlocks(void);
>  bool hv_vcpu_is_preempted(int vcpu);
> +void hv_sleep_notifiers_register(void);
>  #else
>  static inline void hv_apic_init(void) {}
> +static inline void hv_sleep_notifiers_register(void) {};
>  #endif
>  
>  struct irq_domain *hv_create_pci_msi_domain(void);

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo