linux-kernel - [PATCH 0/2] Fix double allocation in swiotlb

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Date: Fri, 26 Jan 2024 15:19:54 +0000
From: Will Deacon <will@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	iommu@...ts.linux.dev,
	Christoph Hellwig <hch@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Petr Tesarik <petr.tesarik1@...wei-partners.com>,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH 0/2] Fix double allocation in swiotlb_alloc()

Hi folks,

These two patches fix a nasty double allocation problem in swiotlb_alloc()
and add a diagnostic to help catch any similar issues in future. This was
a royal pain to track down and I've had to make a bit of a leap at the
correct alignment semantics (i.e. iotlb_align_mask vs alloc_align_mask).

Without these changes, we've been observing random vsock hangs when
communicating with virtual machines in Android.

Please have a look!

Cheers,

Will

Cc: iommu@...ts.linux.dev
Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Petr Tesarik <petr.tesarik1@...wei-partners.com>
Cc: Dexuan Cui <decui@...rosoft.com>

--->8

Will Deacon (2):
  swiotlb: Fix allocation alignment requirement when searching slots
  swiotlb: Enforce page alignment in swiotlb_alloc()

 kernel/dma/swiotlb.c | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

-- 
2.43.0.429.g432eaa2c6b-goog