linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Add opt-in for ATS support on discrete devices

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Date:   Fri, 3 Mar 2023 17:51:00 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Robin Murphy <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] iommu/vt-d: Add opt-in for ATS support on discrete
 devices

On 2023/3/3 16:19, Tian, Kevin wrote:
> But Baolu, seems there is a small bug on handling satcu->atc_required.
> This indicates that ATS must be enabled as a functional requirement.
> Then we should handle the failure of pci_enable_ats() on such device.

Yes. We have people working on this. For example, when pci=noats is opt-
in, pci_enable_ats() definitely will return failure.

Best regards,
baolu