linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Move PCI PASID enablement to probe path

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Message-ID: <20240816133154.GQ3468552@ziepe.ca>
Date: Fri, 16 Aug 2024 10:31:54 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Baolu Lu <baolu.lu@...ux.intel.com>
Cc: Vasant Hegde <vasant.hegde@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Move PCI PASID enablement to probe path

On Fri, Aug 16, 2024 at 09:09:04PM +0800, Baolu Lu wrote:
> On 2024/8/16 20:16, Vasant Hegde wrote:
> > On 8/16/2024 4:19 PM, Lu Baolu wrote:
> > > Currently, PCI PASID is enabled alongside PCI ATS when an iommu domain is
> > > attached to the device and disabled when the device transitions to block
> > > translation mode. This approach is inappropriate as PCI PASID is a device
> > > feature independent of the type of the attached domain.
> > Reading through other thread, I thought we want to enable both PASID and PRI in
> > device probe path. Did I miss something?
> 
> PRI is different. PRI should be enabled when the first iopf-capable
> domain is attached to device or its PASID, and disabled when the last
> such domain is detached.

+1

Jason