linux-kernel - Re: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1)

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Message-ID: <20241001134815.GG1365916@nvidia.com>
Date: Tue, 1 Oct 2024 10:48:15 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Yi Liu <yi.l.liu@...el.com>
Cc: Nicolin Chen <nicolinc@...dia.com>, kevin.tian@...el.com,
	will@...nel.org, joro@...tes.org, suravee.suthikulpanit@....com,
	robin.murphy@....com, dwmw2@...radead.org, baolu.lu@...ux.intel.com,
	shuah@...nel.org, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, eric.auger@...hat.com,
	jean-philippe@...aro.org, mdf@...nel.org, mshavit@...gle.com,
	shameerali.kolothum.thodi@...wei.com, smostafa@...gle.com
Subject: Re: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1)

On Sun, Sep 29, 2024 at 03:19:42PM +0800, Yi Liu wrote:
> > So their viommu HW concepts come along with a requirement that there
> > be a fixed translation for the VM, which we model by attaching a S2
> > HWPT to the VIOMMU object which get's linked into the IOMMU HW as
> > the translation for the queue memory.
> 
> Is the mapping of the S2 be static? or it an be unmapped per userspace?

In principle it should be dynamic, but I think the vCMDQ stuff will
struggle to do that

Jason