linux-kernel - Re: [PATCH v3 1/1] PCI: Add translated request only flag for pci_enable

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Message-ID: <Y9p1wqicUQOfQ3B5@nvidia.com>
Date:   Wed, 1 Feb 2023 10:22:58 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Joerg Roedel <jroedel@...e.de>,
        Matt Fagnani <matt.fagnani@...l.net>,
        Christian König <christian.koenig@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        Vasant Hegde <vasant.hegde@....com>,
        Tony Zhu <tony.zhu@...el.com>, linux-pci@...r.kernel.org,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] PCI: Add translated request only flag for
 pci_enable_pasid()

On Wed, Feb 01, 2023 at 02:31:04PM +0800, Baolu Lu wrote:
> > This change doesn't feel safe for all possible devices that have a
> > PASID Capability because we don't know whether they*always*  use
> > Translated addresses with PASID TLPs.
> 
> I tend to think you are right. :-)

This is why we discussed moving the pci_enable_pasid() into drivers
and out of the core iommu code as a followup

Jason