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

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Message-ID: <aV-KDEGlplD5EkBx@google.com>
Date: Thu, 8 Jan 2026 10:42:20 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: "David Hildenbrand (Red Hat)" <david@...nel.org>
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,
	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 Wed, Jan 07, 2026 at 05:53:50PM +0100, David Hildenbrand (Red Hat) wrote:
> On 1/6/26 17:21, 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>
> > ---
> 
> I think I acked it, but maybe too late for you to spot it
> 
> for the MM bits
> 
> Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

Thanks! If my mail client is not acting, it seems that was the
same version(v5) also.

Thanks,
Mostafa

> 
> -- 
> Cheers
> 
> David