linux-kernel - Re: [PATCH 5/8] iommufd: Introduce data struct for AMD nested domain allocation

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Message-ID: <20250902130947.GH186519@nvidia.com>
Date: Tue, 2 Sep 2025 10:09:47 -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
Subject: Re: [PATCH 5/8] iommufd: Introduce data struct for AMD nested domain
 allocation

On Wed, Aug 20, 2025 at 11:30:06AM +0000, Suravee Suthikulpanit wrote:
> Introduce IOMMU_HWPT_DATA_AMD_V2 data type for AMD IOMMU v2 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.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  include/uapi/linux/iommufd.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)

I wouldn't call this AMD_V2, the spec calls it "GCR3" and "Guest"

IOMMU_HWPT_DATA_AMD_GUEST

Otherwise 

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

Jason