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

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Message-ID: <30372a67-8c94-4260-9496-dce900abd48e@kernel.org>
Date: Thu, 8 Jan 2026 12:53:20 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
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, 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 1/8/26 11:42, Mostafa Saleh wrote:
> 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.

Maybe my client is having problems :)

-- 
Cheers

David