From: Jason Gunthorpe <jgg@nvidia.com>
To: Baolu Lu <baolu.lu@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Kevin Tian <kevin.tian@intel.com>, Jann Horn <jannh@google.com>,
Vasant Hegde <vasant.hegde@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Alistair Popple <apopple@nvidia.com>,
Peter Zijlstra <peterz@infradead.org>,
Uladzislau Rezki <urezki@gmail.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Andy Lutomirski <luto@kernel.org>, Yi Lai <yi1.lai@intel.com>,
David Hildenbrand <david@redhat.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Michal Hocko <mhocko@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
iommu@lists.linux.dev, security@kernel.org, x86@kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 0/7] Fix stale IOTLB entries for kernel address space
Date: Fri, 17 Oct 2025 11:01:02 -0300 [thread overview]
Message-ID: <20251017140101.GM3901471@nvidia.com> (raw)
In-Reply-To: <11cad2be-9402-4d45-8d2b-c92d8962edfc@linux.intel.com>
On Fri, Oct 17, 2025 at 09:42:10AM +0800, Baolu Lu wrote:
> On 10/15/25 23:55, Dave Hansen wrote:
> > > > Only [7/7] has acc:stable, even though that patch is not at all
> > > > backportable. Please give some thought and suggestions regarding
> > > > whether you think we should backport this into earlier kernels.
> > > Yes. We should backport this series to stable kernels.
> > >
> > > > If "yes" then the size and scope of the series looks problematic. Is
> > > > it possible to put together something simple and expedient just to plug
> > > > the hole in older kernels?
> > > Squashing some patches is one way. But would it be workable to backport
> > > this series manually? Say, could we send a pull request to the stable
> > > mailing list after this series has landed?
> > I honestly think we should just disable SVA in old kernels at compile
> > time, or at least default it to be disabled at runtime. That's the
> > simplest thing.
> >
> > The other alternative is to have arch_vmap_pmd_supported() return false
> > when SVA is active, or maybe when it's supported on the platform.
> >
> > Either of those are 10-ish lines of code and easy to backport.
>
> Hi iommu folks, any insights on this?
IDK, the only SVA user on x86 I know is IDXD, so if you do the above
plan you break IDXD in all stable kernels. Doesn't sound OK?
Jason
next prev parent reply other threads:[~2025-10-17 14:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-14 13:04 [PATCH v6 0/7] Fix stale IOTLB entries for kernel address space Lu Baolu
2025-10-14 13:04 ` [PATCH v6 1/7] mm: Add a ptdesc flag to mark kernel page tables Lu Baolu
2025-10-16 19:26 ` David Hildenbrand
2025-10-14 13:04 ` [PATCH v6 2/7] mm: Actually mark kernel page table pages Lu Baolu
2025-10-14 13:04 ` [PATCH v6 3/7] x86/mm: Use 'ptdesc' when freeing PMD pages Lu Baolu
2025-10-14 23:19 ` Dave Hansen
2025-10-15 5:19 ` Baolu Lu
2025-10-16 19:33 ` David Hildenbrand
2025-10-14 13:04 ` [PATCH v6 4/7] mm: Introduce pure page table freeing function Lu Baolu
2025-10-14 13:04 ` [PATCH v6 5/7] x86/mm: Use pagetable_free() Lu Baolu
2025-10-14 13:04 ` [PATCH v6 6/7] mm: Introduce deferred freeing for kernel page tables Lu Baolu
2025-10-16 19:35 ` David Hildenbrand
2025-10-17 1:29 ` Baolu Lu
2025-10-14 13:04 ` [PATCH v6 7/7] iommu/sva: Invalidate stale IOTLB entries for kernel address space Lu Baolu
2025-10-14 20:59 ` [syzbot ci] Re: Fix " syzbot ci
2025-10-15 16:25 ` Dave Hansen
2025-10-16 8:00 ` Baolu Lu
2025-10-17 17:05 ` Dave Hansen
2025-10-17 17:10 ` David Hildenbrand
2025-10-20 5:34 ` Baolu Lu
2025-10-20 14:26 ` David Hildenbrand
2025-10-15 0:43 ` [PATCH v6 0/7] " Andrew Morton
2025-10-15 5:38 ` Baolu Lu
2025-10-15 15:55 ` Dave Hansen
2025-10-17 1:42 ` Baolu Lu
2025-10-17 14:01 ` Jason Gunthorpe [this message]
2025-10-17 17:28 ` Dave Hansen
2025-10-17 17:31 ` Dave Hansen
2025-10-17 17:54 ` Jason Gunthorpe
2025-10-17 18:26 ` Vinicius Costa Gomes
2025-10-22 5:06 ` Baolu Lu
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