linux-kernel - Re: [PATCH v5 0/8] Fix stale IOTLB entries for kernel address space

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Message-ID: <a1883b7d-b5f9-419b-ba51-735a977522d9@linux.intel.com>
Date: Tue, 14 Oct 2025 21:21:01 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Dave Hansen <dave.hansen@...el.com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Kevin Tian <kevin.tian@...el.com>, Jason Gunthorpe <jgg@...dia.com>,
 Jann Horn <jannh@...gle.com>, Vasant Hegde <vasant.hegde@....com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Alistair Popple <apopple@...dia.com>,
 Peter Zijlstra <peterz@...radead.org>, Uladzislau Rezki <urezki@...il.com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>,
 Andy Lutomirski <luto@...nel.org>, Yi Lai <yi1.lai@...el.com>,
 David Hildenbrand <david@...hat.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>,
 Mike Rapoport <rppt@...nel.org>, Michal Hocko <mhocko@...nel.org>,
 Matthew Wilcox <willy@...radead.org>
Cc: baolu.lu@...ux.intel.com, iommu@...ts.linux.dev, security@...nel.org,
 x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/8] Fix stale IOTLB entries for kernel address space

On 10/9/2025 3:42 AM, Dave Hansen wrote:
> I wondered why no mm folks were commenting on this. linux-mm@ was cc'd,
> but the_people_ on cc seem to have been almost all IOMMU and x86 folks.
> so I added a few mm folks...
> 
> On 9/25/25 13:24, Dave Hansen wrote:
>> On 9/18/25 22:39, Lu Baolu wrote:
>>> This solution introduces a deferred freeing mechanism for kernel page
>>> table pages, which provides a safe window to notify the IOMMU to
>>> invalidate its caches before the page is reused.
>> I think all the activity has died down and I everyone seems happy enough
>> with how this looks. Right?
>>
>> So is this something we should prod Andrew to take through the mm tree,
>> or is it x86-specific enough it should go through tip?
> Hi Folks! We've got a bug fix here that has impact on x86, mm, and IOMMU
> code. I know I've talked with a few of you about this along the way, but
> it's really thin on mm reviews, probably because mm folks haven't been
> cc'd. Any eyeballs on it would be appreciated!
> 
> It seems like it should_probably_ go through the mm tree, although I'm
> happy to send it through tip if folks disagree.

Thank you all for the review comments. I have updated this series with a
new version and posted it here, with the mm folks cc'ed:

https://lore.kernel.org/linux-iommu/20251014130437.1090448-1-baolu.lu@linux.intel.com/

Thanks,
baolu