linux-kernel - RE: [PATCH RFC 10/11] iommu: Make IOPF handling framework generic

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Date:   Mon, 21 Mar 2022 08:09:36 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
CC:     Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC 10/11] iommu: Make IOPF handling framework generic

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Sunday, March 20, 2022 2:40 PM
> 
> The existing IOPF handling framework only handles the I/O page faults for
> SVA. Ginven that we are able to link iommu domain with each I/O page fault,
> we can now make the I/O page fault handling framework more general for
> more types of page faults.

"make ... generic" in subject line is kind of confusing. Reading this patch I
think you really meant changing from per-device fault handling to per-domain
fault handling. This is more accurate in concept since the fault is caused by
the domain page table. 😊