From: "Jörg Rödel" <joro@8bytes.org>
To: Mostafa Saleh <smostafa@google.com>
Cc: linux-mm@kvack.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
corbet@lwn.net, 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
Subject: Re: [RFC PATCH 1/4] drivers/iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC
Date: Mon, 27 Oct 2025 12:42:09 +0100 [thread overview]
Message-ID: <uwznrzdsbfpbalzf5jxxpguf2ykslphfs47u7gf66ssiwzpqju@dh7nw3van6sr> (raw)
In-Reply-To: <20251003173229.1533640-2-smostafa@google.com>
On Fri, Oct 03, 2025 at 05:32:26PM +0000, Mostafa Saleh wrote:
> +config IOMMU_DEBUG_PAGEALLOC
> + bool "Debug page memory allocations against IOMMU"
> + depends on DEBUG_PAGEALLOC && IOMMU_API && PAGE_EXTENSION
> + help
> + This config checks when a page is freed by the kernel
> + it's not mapped in any IOMMU domain. It can help with
> + debugging use-after-free from driver doing DMA.
> + This santaizer can have false-negative cases where some
> + problems won't be detected.
> + Expect overhead when enabling this + enabling the kernel
> + command line iommu.debug_pagealloc.
> +
> + If unsure, say N here.
Expected indentation here is <tab><space><space> and not <tab><tab>.
> --- /dev/null
> +++ b/drivers/iommu/iommu-debug.c
Is there a plan for this file to contain more than page-alloc debugging? If
not, it should get a more specific name, like iommu-debug-pagealloc.c or
similar.
next prev parent reply other threads:[~2025-10-27 11:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-03 17:32 [RFC PATCH 0/4] iommu: Add IOMMU_DEBUG_PAGEALLOC sanitizer Mostafa Saleh
2025-10-03 17:32 ` [RFC PATCH 1/4] drivers/iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC Mostafa Saleh
2025-10-27 11:42 ` Jörg Rödel [this message]
2025-10-29 14:21 ` Mostafa Saleh
2025-10-03 17:32 ` [RFC PATCH 2/4] drivers/iommu: Add calls for iommu debug Mostafa Saleh
2025-10-27 11:43 ` Jörg Rödel
2025-10-29 14:22 ` Mostafa Saleh
2025-10-03 17:32 ` [RFC PATCH 3/4] drivers/iommu-debug: Track IOMMU pages Mostafa Saleh
2025-10-27 11:46 ` Jörg Rödel
2025-10-29 14:24 ` Mostafa Saleh
2025-10-03 17:32 ` [RFC PATCH 4/4] drivers/iommu-debug: Check state of mapped/unmapped kernel memory Mostafa Saleh
2025-10-18 8:46 ` [RFC PATCH 0/4] iommu: Add IOMMU_DEBUG_PAGEALLOC sanitizer Qinxin Xia
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