linux-kernel - Re: [PATCH v1 0/4] mm: Implement ECC handling for pfn with no struct page

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Message-ID: <20230920160424.GD13733@nvidia.com>
Date:   Wed, 20 Sep 2023 13:04:24 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     ankita@...dia.com, alex.williamson@...hat.com, tony.luck@...el.com,
        bp@...en8.de, naoya.horiguchi@....com, linmiaohe@...wei.com,
        aniketa@...dia.com, cjia@...dia.com, kwankhede@...dia.com,
        targupta@...dia.com, vsethi@...dia.com, acurrid@...dia.com,
        anuaggarwal@...dia.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-edac@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v1 0/4] mm: Implement ECC handling for pfn with no struct
 page

On Wed, Sep 20, 2023 at 09:02:22AM -0700, Andrew Morton wrote:
> On Wed, 20 Sep 2023 19:32:06 +0530 <ankita@...dia.com> wrote:
> 
> > The kernel MM currently handles ECC errors / poison only on memory page
> > backed by struct page. As part of [1], the nvgrace-gpu-vfio-pci module
> > maps the device memory to user VA (Qemu) using remap_pfn_range without
> > being added to the kernel. These pages are not backed by struct page.
> 
> Are you able to identify any other drivers which can (or will) use
> this?  Or is it likely that this feature will only ever be for
> nvgrace-gpu-vfio-pci?

I think a future vfio-cxl will have a similar desire at least.

Jason