linux-kernel - Re: [PATCH 3/6] mshv: Add the HVCALL_GET_PARTITION_PROPERTY

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Message-ID: <daa0202d-3f9e-42eb-a356-2a1ac08e69d2@linux.microsoft.com>
Date: Fri, 5 Sep 2025 12:28:59 -0700
From: Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
 easwar.hariharan@...ux.microsoft.com, kys@...rosoft.com,
 haiyangz@...rosoft.com, wei.liu@...nel.org, mhklinux@...look.com,
 decui@...rosoft.com, paekkaladevi@...ux.microsoft.com
Subject: Re: [PATCH 3/6] mshv: Add the HVCALL_GET_PARTITION_PROPERTY_EX
 hypercall

On 8/28/2025 5:43 PM, Nuno Das Neves wrote:
> From: Purna Pavan Chandra Aekkaladevi <paekkaladevi@...ux.microsoft.com>
> 
> This hypercall can be used to fetch extended properties of a
> partition. Extended properties are properties with values larger than
> a u64. Some of these also need additional input arguments.
> 
> Add helper function for using the hypercall in the mshv_root driver.
> 
> Signed-off-by: Purna Pavan Chandra Aekkaladevi <paekkaladevi@...ux.microsoft.com>
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
> ---
>  drivers/hv/mshv_root.h         |  2 ++
>  drivers/hv/mshv_root_hv_call.c | 31 ++++++++++++++++++++++++++
>  include/hyperv/hvgdk_mini.h    |  1 +
>  include/hyperv/hvhdk.h         | 40 ++++++++++++++++++++++++++++++++++
>  include/hyperv/hvhdk_mini.h    | 26 ++++++++++++++++++++++
>  5 files changed, 100 insertions(+)
> 
> diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h
> index e3931b0f1269..4aeb03bea6b6 100644
> --- a/drivers/hv/mshv_root.h
> +++ b/drivers/hv/mshv_root.h
> @@ -303,6 +303,8 @@ int hv_call_unmap_stat_page(enum hv_stats_object_type type,
>  int hv_call_modify_spa_host_access(u64 partition_id, struct page **pages,
>  				   u64 page_struct_count, u32 host_access,
>  				   u32 flags, u8 acquire);
> +int hv_call_get_partition_property_ex(u64 partition_id, u64 property_code, u64 arg,
> +				      void *property_value, size_t property_value_sz);
>  
>  extern struct mshv_root mshv_root;
>  extern enum hv_scheduler_type hv_scheduler_type;
> diff --git a/drivers/hv/mshv_root_hv_call.c b/drivers/hv/mshv_root_hv_call.c
> index 1c38576a673c..7589b1ff3515 100644
> --- a/drivers/hv/mshv_root_hv_call.c
> +++ b/drivers/hv/mshv_root_hv_call.c
> @@ -590,6 +590,37 @@ int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
>  	return hv_result_to_errno(status);
>  }
>  
> +int
> +hv_call_get_partition_property_ex(u64 partition_id, u64 property_code, u64 arg,

One line like in patch 2..

<snip>

Thanks,
Easwar (he/him)