linux-kernel - Re: [PATCH v5 0/3] mm: Implement ECC handling for pfn with no struct page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CACw3F53n1ieCfP7Dye96S1WPpein+x6wTVUhE4aVkRG=VppC-g@mail.gmail.com>
Date: Tue, 20 Jan 2026 21:51:07 -0800
From: Jiaqi Yan <jiaqiyan@...gle.com>
To: Ankit Agrawal <ankita@...dia.com>
Cc: Aniket Agashe <aniketa@...dia.com>, Vikram Sethi <vsethi@...dia.com>, 
	Jason Gunthorpe <jgg@...dia.com>, Matt Ochs <mochs@...dia.com>, 
	Shameer Kolothum <skolothumtho@...dia.com>, "linmiaohe@...wei.com" <linmiaohe@...wei.com>, 
	"nao.horiguchi@...il.com" <nao.horiguchi@...il.com>, 
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "david@...hat.com" <david@...hat.com>, 
	"lorenzo.stoakes@...cle.com" <lorenzo.stoakes@...cle.com>, 
	"Liam.Howlett@...cle.com" <Liam.Howlett@...cle.com>, "vbabka@...e.cz" <vbabka@...e.cz>, 
	"rppt@...nel.org" <rppt@...nel.org>, "surenb@...gle.com" <surenb@...gle.com>, "mhocko@...e.com" <mhocko@...e.com>, 
	"tony.luck@...el.com" <tony.luck@...el.com>, "bp@...en8.de" <bp@...en8.de>, 
	"rafael@...nel.org" <rafael@...nel.org>, "guohanjun@...wei.com" <guohanjun@...wei.com>, 
	"mchehab@...nel.org" <mchehab@...nel.org>, "lenb@...nel.org" <lenb@...nel.org>, 
	"kevin.tian@...el.com" <kevin.tian@...el.com>, "alex@...zbot.org" <alex@...zbot.org>, Neo Jia <cjia@...dia.com>, 
	Kirti Wankhede <kwankhede@...dia.com>, "Tarun Gupta (SW-GPU)" <targupta@...dia.com>, Zhi Wang <zhiw@...dia.com>, 
	Dheeraj Nigam <dnigam@...dia.com>, Krishnakant Jaju <kjaju@...dia.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, 
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>, 
	"Jonathan.Cameron@...wei.com" <Jonathan.Cameron@...wei.com>, "ira.weiny@...el.com" <ira.weiny@...el.com>, 
	"Smita.KoralahalliChannabasappa@....com" <Smita.KoralahalliChannabasappa@....com>, 
	"u.kleine-koenig@...libre.com" <u.kleine-koenig@...libre.com>, 
	"peterz@...radead.org" <peterz@...radead.org>, 
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, 
	Axel Rasmussen <axelrasmussen@...gle.com>
Subject: Re: [PATCH v5 0/3] mm: Implement ECC handling for pfn with no struct page

On Tue, Jan 20, 2026 at 8:28 AM Jiaqi Yan <jiaqiyan@...gle.com> wrote:
>
> On Fri, Jan 16, 2026 at 9:36 PM Ankit Agrawal <ankita@...dia.com> wrote:
> >
> > >>
> > >> v2 -> v3
> > >> - Rebased to v6.17-rc7.
> > >> - Skipped the unmapping of PFNMAP during reception of poison. Suggested by
> > >> Jason Gunthorpe, Jiaqi Yan, Vikram Sethi (Thanks!)
> > >> - Updated the check to prevent multiple registration to the same PFN
> > >> range using interval_tree_iter_first. Thanks Shameer Kolothum for the
> > >> suggestion.
> > >> - Removed the callback function in the nvgrace-gpu requiring tracking of
> > >> poisoned PFN as it isn't required anymore.
> > >
> > > Hi Ankit,
> > >
> > >
> > > I get that for nvgrace-gpu driver, you removed pfn_address_space_ops
> > > because there is no need to unmap poisoned HBM page.
> > >
> > > What about the nvgrace-egm driver? Now that you removed the
> > > pfn_address_space_ops callback from pfn_address_space in [1], how can
> > > nvgrace-egm driver know the poisoned EGM pages at runtime?
> > >
> > > I expect the functionality to return retired pages should also include
> > > runtime poisoned pages, which are not in the list queried from
> > > egm-retired-pages-data-base during initialization. Or maybe my
> > > expection is wrong/obsolete?
> >
> > Hi Jiaqi, yes the EGM code will include consideration for runtime
> > poisoned pages as well. It will now instead make use of the
> > pfn_to_vma_pgoff callback merged through https://github.com/torvalds/linux/commit/e6dbcb7c0e7b508d443a9aa6f77f63a2f83b1ae4
>
> Thank you! Sorry I wasn't following that thread closely and missed it.

Sorry, one more quesiton. I saw [3] implemented pfn_to_vma_pgoff
callback in nvgrace gpu driver. Is EGM driver's callback posted
somewhere?

[3] https://lore.kernel.org/all/20251211070603.338701-2-ankita@nvidia.com/T/#mcc9ccec90b1ca755ad9af0a821f5ce524fed0ffc


>
> >
> > > [1] https://lore.kernel.org/linux-mm/20230920140210.12663-2-ankita@nvidia.com
> > > [2] https://lore.kernel.org/kvm/20250904040828.319452-12-ankita@nvidia.com
> >