linux-kernel - Re: [PATCH 1/2] hyperv: Add definitions for MSHV sleep state configuration

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Message-ID: <d975bc21-9ec0-497d-a481-a7f0c282d5b5@linux.microsoft.com>
Date: Thu, 9 Oct 2025 12:22:39 -0700
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: Praveen K Paladugu <prapal@...ux.microsoft.com>, 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
Cc: anbelski@...ux.microsoft.com
Subject: Re: [PATCH 1/2] hyperv: Add definitions for MSHV sleep state
 configuration

On 10/9/2025 8:58 AM, Praveen K Paladugu wrote:
> Add the definitions required to configure sleep states in mshv hypervsior.
> 
> 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>
> ---
>  include/hyperv/hvgdk_mini.h |  4 +++-
>  include/hyperv/hvhdk_mini.h | 33 +++++++++++++++++++++++++++++++++
>  2 files changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h
> index 77abddfc750e..943df5d292f2 100644
> --- a/include/hyperv/hvgdk_mini.h
> +++ b/include/hyperv/hvgdk_mini.h
> @@ -464,18 +464,20 @@ union hv_vp_assist_msr_contents {	 /* HV_REGISTER_VP_ASSIST_PAGE */
>  #define HVCALL_RESET_DEBUG_SESSION			0x006b
>  #define HVCALL_MAP_STATS_PAGE				0x006c
>  #define HVCALL_UNMAP_STATS_PAGE				0x006d
> +#define HVCALL_SET_SYSTEM_PROPERTY			0x006f
>  #define HVCALL_ADD_LOGICAL_PROCESSOR			0x0076
>  #define HVCALL_GET_SYSTEM_PROPERTY			0x007b
>  #define HVCALL_MAP_DEVICE_INTERRUPT			0x007c
>  #define HVCALL_UNMAP_DEVICE_INTERRUPT			0x007d
>  #define HVCALL_RETARGET_INTERRUPT			0x007e
> +#define HVCALL_ENTER_SLEEP_STATE			0x0084
>  #define HVCALL_NOTIFY_PORT_RING_EMPTY			0x008b
>  #define HVCALL_REGISTER_INTERCEPT_RESULT		0x0091
>  #define HVCALL_ASSERT_VIRTUAL_INTERRUPT			0x0094
>  #define HVCALL_CREATE_PORT				0x0095
>  #define HVCALL_CONNECT_PORT				0x0096
>  #define HVCALL_START_VP					0x0099
> -#define HVCALL_GET_VP_INDEX_FROM_APIC_ID			0x009a
> +#define HVCALL_GET_VP_INDEX_FROM_APIC_ID		0x009a
>  #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE	0x00af
>  #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST	0x00b0
>  #define HVCALL_SIGNAL_EVENT_DIRECT			0x00c0
> diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h
> index 858f6a3925b3..8fa86c014c25 100644
> --- a/include/hyperv/hvhdk_mini.h
> +++ b/include/hyperv/hvhdk_mini.h
> @@ -114,10 +114,24 @@ enum hv_snp_status {
>  
>  enum hv_system_property {
>  	/* Add more values when needed */
> +	HV_SYSTEM_PROPERTY_SLEEP_STATE = 3,
>  	HV_SYSTEM_PROPERTY_SCHEDULER_TYPE = 15,
>  	HV_DYNAMIC_PROCESSOR_FEATURE_PROPERTY = 21,
>  };
>  
> +enum hv_sleep_state {
> +	HV_SLEEP_STATE_S1 = 1,
> +	HV_SLEEP_STATE_S2 = 2,
> +	HV_SLEEP_STATE_S3 = 3,
> +	HV_SLEEP_STATE_S4 = 4,
> +	HV_SLEEP_STATE_S5 = 5,
> +	/*
> +	 * After hypervisor has received this, any follow up sleep
> +	 * state registration requests will be rejected.
> +	 */
> +	HV_SLEEP_STATE_LOCK = 6
> +};
> +
>  enum hv_dynamic_processor_feature_property {
>  	/* Add more values when needed */
>  	HV_X64_DYNAMIC_PROCESSOR_FEATURE_MAX_ENCRYPTED_PARTITIONS = 13,
> @@ -145,6 +159,25 @@ struct hv_output_get_system_property {
>  	};
>  } __packed;
>  
> +struct hv_sleep_state_info {
> +	u32 sleep_state; /* enum hv_sleep_state */
> +	u8 pm1a_slp_typ;
> +	u8 pm1b_slp_typ;
> +} __packed;
> +
> +struct hv_input_set_system_property {
> +	u32 property_id; /* enum hv_system_property */
> +	u32 reserved;
> +	union {
> +		/* More fields to be filled in when needed */
> +		struct hv_sleep_state_info set_sleep_state_info;
> +	};
> +} __packed;
> +
> +struct hv_input_enter_sleep_state {     /* HV_INPUT_ENTER_SLEEP_STATE */
> +	u32 sleep_state;        /* enum hv_sleep_state */
> +} __packed;
> +
>  struct hv_input_map_stats_page {
>  	u32 type; /* enum hv_stats_object_type */
>  	u32 padding;

Reviewed-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>