linux-kernel - Re: [PATCH v4 0/5] Fix double allocation in swiotlb

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Date: Fri, 23 Feb 2024 03:34:56 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Will Deacon <will@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <kernel-team@...roid.com>,
	<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>,
	Michael Kelley <mhklinux@...look.com>
Subject: Re: [PATCH v4 0/5] Fix double allocation in swiotlb_alloc()

On Wed, Feb 21, 2024 at 11:34:59AM +0000, Will Deacon wrote:
> Hi again, folks,
> 
> This is version four of the patches which I previously posted at:
> 
> v1: https://lore.kernel.org/r/20240126151956.10014-1-will@kernel.org
> v2: https://lore.kernel.org/r/20240131122543.14791-1-will@kernel.org
> v3: https://lore.kernel.org/r/20240205190127.20685-1-will@kernel.org
> 
> Thanks to Petr for his Reviewed-by tag on the first three.
> 
> Changes since v3 include:
> 
>   - Use umax() instead of max() to fix a build warning if the first
>     patch is applied to older kernels which warn on signedness
>     mismatches.
> 
>   - Add two new patches to the end of the series to resolve some
>     additional issues with NVME and 64KiB pages, reported by Nicolin.
>     I've added them to this series, as the first three patches make it
>     easier to fix this problem in the SWIOTLB code.
> 
>   - Add Reviewed-by tags from Petr
> 
> 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>
> Cc: Nicolin Chen <nicolinc@...dia.com>

This fixes the bug with NVME on arm64/SMMU when PAGE_SIZE=64KiB.

Tested-by: Nicolin Chen <nicolinc@...dia.com>

Thanks!