linux-kernel - Re: [PATCH RFC PREVIEW 0/6] iommu: enable user space iopfs in non-nested and non-svm cases

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Message-ID: <20240904161350.GE1909087@ziepe.ca>
Date: Wed, 4 Sep 2024 13:13:50 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Joel Granados <j.granados@...sung.com>
Cc: Klaus Jensen <its@...elevant.dk>, David Woodhouse <dwmw2@...radead.org>,
	Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>,
	Minwoo Im <minwoo.im@...sung.com>, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev, Klaus Jensen <k.jensen@...sung.com>
Subject: Re: [PATCH RFC PREVIEW 0/6] iommu: enable user space iopfs in
 non-nested and non-svm cases

On Mon, Sep 02, 2024 at 12:48:19PM +0200, Joel Granados wrote:
> > >   Supplementary repositories supporting this patchset:
> > >     1. A user space library libvfn [1] which is used for testing and
> > >        verification (see examples/iopf.c), and
> > 
> > That's pretty neat, I've been wanting to see some kind of IOMMU test
> > suite based around a capable widely available device. This is the
> > closest I've seen..
>
> Yes! This is an obvious application of libvfn. Do you see it as a
> something that can be included in tools/selftests/iommu?

Maybe? What would it look like in-kernel?

I've been thinking the same thing with mlx5

Maybe some kind of test runner with a plugin driver that has some kind
of 'do dma', 'generate interrupt', etc sort of operations, IDK.

Jason