linux-kernel - Re: [PATCH v2 1/2] hyperv: add definitions for arm64 gpa intercepts

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Message-ID: <aVvubEEqnIxkvib2@skinsburskii.localdomain>
Date: Mon, 5 Jan 2026 09:01:32 -0800
From: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To: Anirudh Rayabharam <anirudh@...rudhrb.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
	decui@...rosoft.com, longli@...rosoft.com,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] hyperv: add definitions for arm64 gpa intercepts

On Mon, Jan 05, 2026 at 12:28:36PM +0000, Anirudh Rayabharam wrote:
> From: Anirudh Rayabharam (Microsoft) <anirudh@...rudhrb.com>
> 
> Add definitions required for handling GPA intercepts on arm64.
> 
> Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@...rudhrb.com>

Reviewed-by: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>

> ---
>  include/hyperv/hvhdk.h | 47 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/include/hyperv/hvhdk.h b/include/hyperv/hvhdk.h
> index 469186df7826..08965970c17d 100644
> --- a/include/hyperv/hvhdk.h
> +++ b/include/hyperv/hvhdk.h
> @@ -800,6 +800,53 @@ struct hv_x64_memory_intercept_message {
>  	u8 instruction_bytes[16];
>  } __packed;
>  
> +#if IS_ENABLED(CONFIG_ARM64)
> +union hv_arm64_vp_execution_state {
> +	u16 as_uint16;
> +	struct {
> +		u16 cpl:2; /* Exception Level (EL) */
> +		u16 debug_active:1;
> +		u16 interruption_pending:1;
> +		u16 vtl:4;
> +		u16 virtualization_fault_active:1;
> +		u16 reserved:7;
> +	} __packed;
> +};
> +
> +struct hv_arm64_intercept_message_header {
> +	u32 vp_index;
> +	u8 instruction_length;
> +	u8 intercept_access_type;
> +	union hv_arm64_vp_execution_state execution_state;
> +	u64 pc;
> +	u64 cpsr;
> +} __packed;
> +
> +union hv_arm64_memory_access_info {
> +	u8 as_uint8;
> +	struct {
> +		u8 gva_valid:1;
> +		u8 gva_gpa_valid:1;
> +		u8 hypercall_output_pending:1;
> +		u8 reserved:5;
> +	} __packed;
> +};
> +
> +struct hv_arm64_memory_intercept_message {
> +	struct hv_arm64_intercept_message_header header;
> +	u32 cache_type; /* enum hv_cache_type */
> +	u8 instruction_byte_count;
> +	union hv_arm64_memory_access_info memory_access_info;
> +	u16 reserved1;
> +	u8 instruction_bytes[4];
> +	u32 reserved2;
> +	u64 guest_virtual_address;
> +	u64 guest_physical_address;
> +	u64 syndrome;
> +} __packed;
> +
> +#endif /* CONFIG_ARM64 */
> +
>  /*
>   * Dispatch state for the VP communicated by the hypervisor to the
>   * VP-dispatching thread in the root on return from HVCALL_DISPATCH_VP.
> -- 
> 2.34.1
>