linux-kernel - Re: [PATCH v4 12/16] iommu/amd: Add support for nested domain allocation

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Message-ID: <20251022200157.GD262900@nvidia.com>
Date: Wed, 22 Oct 2025 17:01:57 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc: nicolinc@...dia.com, linux-kernel@...r.kernel.org, robin.murphy@....com,
	will@...nel.org, joro@...tes.org, kevin.tian@...el.com,
	jsnitsel@...hat.com, vasant.hegde@....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 12/16] iommu/amd: Add support for nested domain
 allocation

On Tue, Oct 21, 2025 at 01:43:20AM +0000, Suravee Suthikulpanit wrote:
> The nested domain is allocated with IOMMU_DOMAIN_NESTED type to store
> stage-1 translation (i.e. GVA->GPA). This includes the GCR3 root pointer
> table along with guest page tables. The struct iommu_hwpt_amd_guest
> contains this information, and is passed from user-space as a parameter
> of the struct iommu_ops.domain_alloc_nested().
> 
> Reviewed-by: Nicolin Chen <nicolinc@...dia.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  drivers/iommu/amd/Makefile          |   2 +-
>  drivers/iommu/amd/amd_iommu.h       |   4 +
>  drivers/iommu/amd/amd_iommu_types.h |  14 ++++
>  drivers/iommu/amd/nested.c          | 111 ++++++++++++++++++++++++++++

Might be nicer to put this in amd/iommufd.c, but up to you

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason