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imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=tq1cJ425; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1767725443; a=rsa-sha256; cv=none; b=amMo8MzEIMZgjbOvmvb/FiXlq9vI/boUGiNKEyd63FSYV3Xs5ih7uHCz87LfKxJ5QHgjkW 5DgNIX6LcOfvTBKvgSyfN+1qNEi92+yrYGSfTVej6pBzuktHbjAXlC1iTE2FhiXr5/4JkV o1tQkUkDU97AjEMyCWRd347dKbqC8z0= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 66BD2443D2; Tue, 6 Jan 2026 18:50:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3307C116C6; Tue, 6 Jan 2026 18:50:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767725442; bh=I/bcoXQ6kDpOCwpshNUvwwN7/ElnY0U8t+Mw0UoO0lI=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=tq1cJ425gNeqChPTy3WE50LL9HdUJu7POBrgUKJL2W39VOA8vFF9xtEHWEFS06gNC G0tn/jVfDVZIXidulUSDfbuE/7b/1Uvlh/jdU4uMr1A7fq773YAomQwKIrmtDWp5D+ SwTtTSnSYEqrfbDCerRJTcMggsHFUooFYGJBhTwOVCH8DDIysH3NunrfEJGwsStVWT PLt/OueGqUbk+drqJgYTWW1SEY4mzR9Dy+LF6Lazkpn893XXR/rREFeiSZGEOcksIj 9nBDcd9fSVfbNevQWcZSmdNu5672lu7FwE2Fx9YTwxqBdDsgvVNF1e3XkE5UYOom2E f/Y5MqCbL0+yQ== Message-ID: <42286636-2fca-4658-a79d-145ad1c37b37@kernel.org> Date: Tue, 6 Jan 2026 19:50:33 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/4] iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC To: Mostafa Saleh , linux-mm@kvack.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: 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, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, xiaqinxin@huawei.com, baolu.lu@linux.intel.com, rdunlap@infradead.org References: <20260106162200.2223655-1-smostafa@google.com> <20260106162200.2223655-2-smostafa@google.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 42C164000E X-Stat-Signature: rd4aoj3dhqiupmzuyywmrmfjsposo4es X-HE-Tag: 1767725443-196186 X-HE-Meta: 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 sSl1gMNX 2bOamkSUYJJe3BfZX3Gnxca9hOfUiYvveaHCrFtCTdgj4QXBz4sG73moYmE8ea+sYqvHPIMGuPwzrSiwCNEChzhpLR2lJQsmBEk5BVs2zPCQDVG+yh9WQVCq9fuxB4ePZHpkzmXXO6HMFzJSw/zm6ohv2QwQz8gMCv9Wf1JqIUydTYKNaKEkJWv4mf406fYbxxn5wxr7wer7cWpzrYvWBgI1G37jCS8MkoKCgX/+ortkHbG/sJgMU+3zkhB7lx8G+KWqQZJejONpGQxlYXRVDuIO5qjYkxlOXbQ8aEMixn/kteJxCGZwhwfpe9e2iJaThtoqNKB84abvoT9ZKCclsqvvN1fV6/YSnllHxEyHkt4+8sVnAVC1Y4FqJScgiTbWmBk9HEpOQZjXVAsETp1DB1dt2RXUCDqDJ+4P6 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 > Signed-off-by: Mostafa Saleh > --- [...] > +#endif /* __LINUX_IOMMU_DEBUG_PAGEALLOC_H */ > diff --git a/mm/page_ext.c b/mm/page_ext.c > index d7396a8970e5..297e4cd8ce90 100644 > --- a/mm/page_ext.c > +++ b/mm/page_ext.c > @@ -11,6 +11,7 @@ > #include > #include > #include > +#include > > /* > * struct page extension > @@ -89,6 +90,9 @@ static struct page_ext_operations *page_ext_ops[] __initdata = { > #ifdef CONFIG_PAGE_TABLE_CHECK > &page_table_check_ops, > #endif > +#ifdef CONFIG_IOMMU_DEBUG_PAGEALLOC > + &page_iommu_debug_ops, > +#endif > }; > > unsigned long page_ext_size; The MM bits LGTM Acked-by: David Hildenbrand (Red Hat) -- Cheers David