linux-kernel - Re: [PATCH v5 1/4] iommu: Add page_ext for IOMMU_DEBUG

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Message-ID: <aV57D6OiuKi2359h@google.com>
Date: Wed, 7 Jan 2026 15:26:07 +0000
From: Pranjal Shrivastava <praan@...gle.com>
To: Mostafa Saleh <smostafa@...gle.com>
Cc: linux-mm@...ck.org, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, corbet@....net, joro@...tes.org,
	will@...nel.org, robin.murphy@....com, akpm@...ux-foundation.org,
	vbabka@...e.cz, surenb@...gle.com, mhocko@...e.com,
	jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com,
	david@...hat.com, lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com, rppt@...nel.org, xiaqinxin@...wei.com,
	baolu.lu@...ux.intel.com, rdunlap@...radead.org
Subject: Re: [PATCH v5 1/4] iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC

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 <baolu.lu@...ux.intel.com>
> Signed-off-by: Mostafa Saleh <smostafa@...gle.com>
> ---
>  .../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 <praan@...gle.com>
Thanks!