linux-kernel - Re: [PATCH v4 08/16] iommufd: Introduce data struct for AMD nested domain allocation

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Message-ID: <33deb969-160c-48ca-890d-2b64cc0408f9@amd.com>
Date: Sat, 8 Nov 2025 23:00:36 +0530
From: Vasant Hegde <vasant.hegde@....com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@....com>, jgg@...dia.com,
 nicolinc@...dia.com
Cc: linux-kernel@...r.kernel.org, robin.murphy@....com, will@...nel.org,
 joro@...tes.org, kevin.tian@...el.com, jsnitsel@...hat.com,
 iommu@...ts.linux.dev, santosh.shukla@....com, sairaj.arunkodilkar@....com,
 jon.grimm@....com, prashanthpra@...gle.com, wvw@...gle.com,
 wnliu@...gle.com, gptran@...gle.com, kpsingh@...gle.com,
 joao.m.martins@...cle.com, alejandro.j.jimenez@...cle.com
Subject: Re: [PATCH v4 08/16] iommufd: Introduce data struct for AMD nested
 domain allocation



On 10/21/2025 7:13 AM, Suravee Suthikulpanit wrote:
> Introduce IOMMU_HWPT_DATA_AMD_GUEST data type for IOMMU guest page table,
> which is used for stage-1 in nested translation. The data structure
> contains information necessary for setting up the AMD HW-vIOMMU support.
> 
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Nicolin Chen <nicolinc@...dia.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

Reviewed-by: Vasant Hegde <vasant.hegde@....com>

-Vasant



> ---
>  include/uapi/linux/iommufd.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
> index efb52709c0a2..d111ee1dc572 100644
> --- a/include/uapi/linux/iommufd.h
> +++ b/include/uapi/linux/iommufd.h
> @@ -455,16 +455,27 @@ struct iommu_hwpt_arm_smmuv3 {
>  	__aligned_le64 ste[2];
>  };
>  
> +/**
> + * struct iommu_hwpt_amd_guest - AMD IOMMU guest I/O page table data
> + *				 (IOMMU_HWPT_DATA_AMD_GUEST)
> + * @dte: Guest Device Table Entry (DTE)
> + */
> +struct iommu_hwpt_amd_guest {
> +	__aligned_u64 dte[4];
> +};
> +
>  /**
>   * enum iommu_hwpt_data_type - IOMMU HWPT Data Type
>   * @IOMMU_HWPT_DATA_NONE: no data
>   * @IOMMU_HWPT_DATA_VTD_S1: Intel VT-d stage-1 page table
>   * @IOMMU_HWPT_DATA_ARM_SMMUV3: ARM SMMUv3 Context Descriptor Table
> + * @IOMMU_HWPT_DATA_AMD_GUEST: AMD IOMMU guest page table
>   */
>  enum iommu_hwpt_data_type {
>  	IOMMU_HWPT_DATA_NONE = 0,
>  	IOMMU_HWPT_DATA_VTD_S1 = 1,
>  	IOMMU_HWPT_DATA_ARM_SMMUV3 = 2,
> +	IOMMU_HWPT_DATA_AMD_GUEST = 3,
>  };
>  
>  /**