linux-kernel - Re: [PATCH v1 0/4] Implement IOMMU SVA page fault processing error notifiers

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Message-ID: <20250716121036.GA2120051@ziepe.ca>
Date: Wed, 16 Jul 2025 09:10:36 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: "Temerkhanov, Sergey" <sergey.temerkhanov@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Cc: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	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>
Subject: Re: [PATCH v1 0/4] Implement IOMMU SVA page fault processing error
 notifiers

On Wed, Jul 16, 2025 at 11:07:50AM +0000, Temerkhanov, Sergey wrote:
> > -----Original Message-----
> > From: Jason Gunthorpe <jgg@...pe.ca>
> > 
> > You need to come with a driver using this as well.
> > 
> 
> There is an OOT driver which would use this facility do report and
> handle possible invalid accesses (e.g. mismatched VMA permissions)
> during the SVA operation

Upstream a basic driver first then ask for iommu changes to enhance
it.

This is normal stuff, we don't change the kernel to accomodate OOT
drivers.

Jason