Re: [PATCH V3 3/5] mshv: Import data structs around device domains from hyperv headers

[Easwar Hariharan <easwar.hariharan@linux.microsoft.com>]

On 11/2/2026 18:51, Mukesh R wrote:
> Copy/import from Hyper-V public headers, definitions and hypercalls that
> are related to checking for device domain availibility, and mapping and
> unmapping of device pages.
> 
> Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
> Reviewed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
> ---
>  include/hyperv/hvgdk_mini.h |  4 ++++
>  include/hyperv/hvhdk_mini.h | 15 +++++++++++++++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h
> index 966945f0504f..606b16f43e16 100644
> --- a/include/hyperv/hvgdk_mini.h
> +++ b/include/hyperv/hvgdk_mini.h
> @@ -327,6 +327,8 @@ union hv_hypervisor_version_info {
>  /* stimer Direct Mode is available */
>  #define HV_STIMER_DIRECT_MODE_AVAILABLE			BIT(19)
>  
> +#define HV_DEVICE_DOMAIN_AVAILABLE			BIT(24)
> +
>  /*
>   * Implementation recommendations. Indicates which behaviors the hypervisor
>   * recommends the OS implement for optimal performance.
> @@ -489,6 +491,8 @@ union hv_vp_assist_msr_contents {	 /* HV_REGISTER_VP_ASSIST_PAGE */
>  #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST	0x00b0
>  #define HVCALL_CREATE_DEVICE_DOMAIN			0x00b1
>  #define HVCALL_ATTACH_DEVICE_DOMAIN			0x00b2
> +#define HVCALL_MAP_DEVICE_GPA_PAGES			0x00b3
> +#define HVCALL_UNMAP_DEVICE_GPA_PAGES			0x00b4
>  #define HVCALL_SIGNAL_EVENT_DIRECT			0x00c0
>  #define HVCALL_POST_MESSAGE_DIRECT			0x00c1
>  #define HVCALL_DISPATCH_VP				0x00c2
> diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h
> index 57b70efe60d4..2bb757e00d86 100644
> --- a/include/hyperv/hvhdk_mini.h
> +++ b/include/hyperv/hvhdk_mini.h
> @@ -549,6 +549,7 @@ union hv_device_id {		/* HV_DEVICE_ID */
>  } __packed;
>  
>  /* Device domain types */
> +#define HV_DEVICE_DOMAIN_TYPE_S2	0 /* HV_DEVICE_DOMAIN_ID_TYPE_S2 */
>  #define HV_DEVICE_DOMAIN_TYPE_S1	1 /* HV_DEVICE_DOMAIN_ID_TYPE_S1 */
>  
>  /* ID for default domain and NULL domain */
> @@ -657,6 +658,20 @@ struct hv_output_get_iommu_capabilities {
>  	u64 pgsize_bitmap;
>  } __packed;
>  
> +struct hv_input_map_device_gpa_pages { /* HV_INPUT_MAP_DEVICE_GPA_PAGES */
> +struct hv_input_device_domain device_domain;

Nit: Needs whitespace

> +	union hv_input_vtl target_vtl;
> +	u8 padding[3];
> +	u32 map_flags;
> +	u64 target_device_va_base;
> +	u64 gpa_page_list[];
> +} __packed;
> +
> +struct hv_input_unmap_device_gpa_pages {  /* HV_INPUT_UNMAP_DEVICE_GPA_PAGES */
> +	struct hv_input_device_domain device_domain;
> +	u64 target_device_va_base;
> +} __packed;
> +
>  /* HV_LOGICAL_DEVICE_PROPERTY_CODE */
>  enum hv_logical_device_property_code {
>  	HV_LOGICAL_DEVICE_PROPERTY_PVIOMMU = 10,