linux-kernel - RE: [PATCH RFCv1 00/14] Add Tegra241 (Grace) CMDQV Support (part 2/2)

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Date: Wed, 22 May 2024 08:40:00 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "will@...nel.org" <will@...nel.org>,
	"robin.murphy@....com" <robin.murphy@....com>, "jgg@...dia.com"
	<jgg@...dia.com>, "suravee.suthikulpanit@....com"
	<suravee.suthikulpanit@....com>
CC: "joro@...tes.org" <joro@...tes.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>, "Liu, Yi L" <yi.l.liu@...el.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>, "shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>
Subject: RE: [PATCH RFCv1 00/14] Add Tegra241 (Grace) CMDQV Support (part 2/2)

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, April 13, 2024 11:47 AM
> 
> This is an experimental RFC series for VIOMMU infrastructure, using NVIDIA
> Tegra241 (Grace) CMDQV as a test instance.
> 
> VIOMMU obj is used to represent a virtual interface (iommu) backed by an
> underlying IOMMU's HW-accelerated feature for virtualizaion: for example,
> NVIDIA's VINTF (v-interface for CMDQV) and AMD"s vIOMMU.
> 
> VQUEUE obj is used to represent a virtual command queue (buffer) backed
> by
> an underlying IOMMU command queue to passthrough for VMs to use
> directly:
> for example, NVIDIA's Virtual Command Queue and AMD's Command Buffer.
> 

is VCMDQ more accurate? AMD also supports fault queue passthrough
then VQUEUE sounds broader than a cmd queue...