linux-kernel - Re: [PATCH v2 3/4] arm64: hugetlb: Fix flush_hugetlb_tlb

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Message-ID: <Z7YrJqRPaqcd2au7@arm.com>
Date: Wed, 19 Feb 2025 19:04:06 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Ryan Roberts <ryan.roberts@....com>
Cc: Will Deacon <will@...nel.org>, Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
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	Albert Ou <aou@...s.berkeley.edu>,
	Heiko Carstens <hca@...ux.ibm.com>,
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	Alexander Gordeev <agordeev@...ux.ibm.com>,
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	"David S. Miller" <davem@...emloft.net>,
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	Arnd Bergmann <arnd@...db.de>, Muchun Song <muchun.song@...ux.dev>,
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	Christoph Hellwig <hch@...radead.org>,
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	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 3/4] arm64: hugetlb: Fix flush_hugetlb_tlb_range()
 invalidation level

On Mon, Feb 17, 2025 at 02:04:16PM +0000, Ryan Roberts wrote:
> commit c910f2b65518 ("arm64/mm: Update tlb invalidation routines for
> FEAT_LPA2") changed the "invalidation level unknown" hint from 0 to
> TLBI_TTL_UNKNOWN (INT_MAX). But the fallback "unknown level" path in
> flush_hugetlb_tlb_range() was not updated. So as it stands, when trying
> to invalidate CONT_PMD_SIZE or CONT_PTE_SIZE hugetlb mappings, we will
> spuriously try to invalidate at level 0 on LPA2-enabled systems.
> 
> Fix this so that the fallback passes TLBI_TTL_UNKNOWN, and while we are
> at it, explicitly use the correct stride and level for CONT_PMD_SIZE and
> CONT_PTE_SIZE, which should provide a minor optimization.
> 
> Cc: stable@...r.kernel.org
> Fixes: c910f2b65518 ("arm64/mm: Update tlb invalidation routines for FEAT_LPA2")
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>