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[35.187.245.222]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3cd2b3asm53637475ad.88.2026.01.07.07.26.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jan 2026 07:26:14 -0800 (PST) Date: Wed, 7 Jan 2026 15:26:07 +0000 From: Pranjal Shrivastava To: Mostafa Saleh Cc: linux-mm@kvack.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, corbet@lwn.net, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, xiaqinxin@huawei.com, baolu.lu@linux.intel.com, rdunlap@infradead.org Subject: Re: [PATCH v5 1/4] iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC Message-ID: References: <20260106162200.2223655-1-smostafa@google.com> <20260106162200.2223655-2-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260106162200.2223655-2-smostafa@google.com> On Tue, Jan 06, 2026 at 04:21:57PM +0000, Mostafa Saleh wrote: > Add a new config IOMMU_DEBUG_PAGEALLOC, which registers new data to > page_ext. > > This config will be used by the IOMMU API to track pages mapped in > the IOMMU to catch drivers trying to free kernel memory that they > still map in their domains, causing all types of memory corruption. > > This behaviour is disabled by default and can be enabled using > kernel cmdline iommu.debug_pagealloc. > > Reviewed-by: Lu Baolu > Signed-off-by: Mostafa Saleh > --- > .../admin-guide/kernel-parameters.txt | 9 ++++++ > drivers/iommu/Kconfig | 19 +++++++++++ > drivers/iommu/Makefile | 1 + > drivers/iommu/iommu-debug-pagealloc.c | 32 +++++++++++++++++++ > include/linux/iommu-debug-pagealloc.h | 17 ++++++++++ > mm/page_ext.c | 4 +++ > 6 files changed, 82 insertions(+) > create mode 100644 drivers/iommu/iommu-debug-pagealloc.c > create mode 100644 include/linux/iommu-debug-pagealloc.h > Reviewed-by: Pranjal Shrivastava Thanks!