linux-kernel - Re: [syzbot ci] Re: Fix stale IOTLB entries for kernel address space

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Message-ID: <f170f6d5-a1f7-4dde-b966-6d6a5aa18f21@intel.com>
Date: Fri, 17 Oct 2025 10:05:26 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Baolu Lu <baolu.lu@...ux.intel.com>,
 syzbot ci <syzbot+cid009622971eb4566@...kaller.appspotmail.com>,
 akpm@...ux-foundation.org, apopple@...dia.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, david@...hat.com, iommu@...ts.linux.dev,
 jannh@...gle.com, jean-philippe@...aro.org, jgg@...dia.com, joro@...tes.org,
 kevin.tian@...el.com, liam.howlett@...cle.com, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, lorenzo.stoakes@...cle.com, luto@...nel.org,
 mhocko@...nel.org, mingo@...hat.com, peterz@...radead.org,
 robin.murphy@....com, rppt@...nel.org, security@...nel.org,
 stable@...r.kernel.org, tglx@...utronix.de, urezki@...il.com,
 vasant.hegde@....com, vbabka@...e.cz, will@...nel.org, willy@...radead.org,
 x86@...nel.org, yi1.lai@...el.com
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot ci] Re: Fix stale IOTLB entries for kernel address space

On 10/16/25 01:00, Baolu Lu wrote:
> while, in this patch, we need the page descriptor that a pmd entry
> points to. Perhaps we should roll back to the previous approach used in
> v5?

Yeah, we should roll back to what v5 did. pmd_ptdesc() is a bit deceiving.