linux-kernel - Re: [PATCH v3 2/5] mshv: Add the HVCALL_GET_PARTITION_PROPERTY

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Message-ID: <aMxS7Wh67SuF4LV2@skinsburskii.localdomain>
Date: Thu, 18 Sep 2025 11:43:57 -0700
From: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	prapal@...ux.microsoft.com, easwar.hariharan@...ux.microsoft.com,
	tiala@...rosoft.com, anirudh@...rudhrb.com,
	paekkaladevi@...ux.microsoft.com, kys@...rosoft.com,
	haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com
Subject: Re: [PATCH v3 2/5] mshv: Add the HVCALL_GET_PARTITION_PROPERTY_EX
 hypercall

On Tue, Sep 16, 2025 at 04:44:19PM -0700, Nuno Das Neves wrote:

<snip>

> diff --git a/include/hyperv/hvhdk.h b/include/hyperv/hvhdk.h
> index b4067ada02cf..b91358b9c929 100644
> --- a/include/hyperv/hvhdk.h
> +++ b/include/hyperv/hvhdk.h
> @@ -376,6 +376,46 @@ struct hv_input_set_partition_property {
>  	u64 property_value;
>  } __packed;
>  
> +union hv_partition_property_arg {
> +	u64 as_uint64;
> +	struct {
> +		union {
> +			u32 arg;
> +			u32 vp_index;
> +		};
> +		u16 reserved0;
> +		u8 reserved1;
> +		u8 object_type;
> +	};
> +} __packed;

Shouldn't the struct be "packed" instead?

> +
> +struct hv_input_get_partition_property_ex {
> +	u64 partition_id;
> +	u32 property_code; /* enum hv_partition_property_code */
> +	u32 padding;
> +	union {
> +		union hv_partition_property_arg arg_data;
> +		u64 arg;
> +	};
> +} __packed;
> +
> +/*
> + * NOTE: Should use hv_input_set_partition_property_ex_header to compute this
> + * size, but hv_input_get_partition_property_ex is identical so it suffices
> + */
> +#define HV_PARTITION_PROPERTY_EX_MAX_VAR_SIZE \
> +	(HV_HYP_PAGE_SIZE - sizeof(struct hv_input_get_partition_property_ex))
> +
> +union hv_partition_property_ex {
> +	u8 buffer[HV_PARTITION_PROPERTY_EX_MAX_VAR_SIZE];
> +	struct hv_partition_property_vmm_capabilities vmm_capabilities;
> +	/* More fields to be filled in when needed */
> +} __packed;

Packing a union is redundant.

Thanks,
Stanislav