linux-kernel - RE: [RFC PATCH 6/6] iommu/amd: Introduce nested translation support

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Date: Fri, 15 Dec 2023 07:45:55 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "joro@...tes.org"
	<joro@...tes.org>, "jgg@...dia.com" <jgg@...dia.com>
CC: "Liu, Yi L" <yi.l.liu@...el.com>, "nicolinc@...dia.com"
	<nicolinc@...dia.com>, "eric.auger@...hat.com" <eric.auger@...hat.com>,
	"vasant.hegde@....com" <vasant.hegde@....com>, "jon.grimm@....com"
	<jon.grimm@....com>, "santosh.shukla@....com" <santosh.shukla@....com>,
	"Dhaval.Giani@....com" <Dhaval.Giani@....com>, "pandoh@...gle.com"
	<pandoh@...gle.com>, "loganodell@...gle.com" <loganodell@...gle.com>
Subject: RE: [RFC PATCH 6/6] iommu/amd: Introduce nested translation support

> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Sent: Wednesday, December 13, 2023 12:02 AM
> 
> To support nested translation on AMD IOMMU, the driver needs to
> program DTE[GCR3 Table Root Pointer] with the address provided by
> the guest via struct iommu_hwpt_amd_v2, which is passed as a parameter
> of the struct iommu_ops.domain_alloc_user() with the flag
> IOMMU_HWPT_ALLOC_NEST_PARENT.
> 
> Note that current implementation only support GCR3TRPMode for
> nested translation, which uses GPA to program GCR3 Table Root Pointer.
> 

means there is a plan to support another mode in the future or
actually the nested translation requires GCR3TRPMode as a
functional requirement? imho the point of GPA is assumed
in the nested configuration in concept...