From: Catalin Marinas <catalin.marinas@arm.com>
To: Fuad Tabba <fuad.tabba@linux.dev>
Cc: Marc Zyngier <maz@kernel.org>, Oliver Upton <oupton@kernel.org>,
kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Steven Price <steven.price@arm.com>,
Yang Shi <yang@os.amperecomputing.com>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>, Fuad Tabba <tabba@google.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/4] KVM: arm64: Clear the whole hugetlb folio when sanitising MTE tags
Date: Thu, 29 Oct 2026 21:44:31 +0000 [thread overview]
Message-ID: <auO-Pzqy-bp8fT4m@arm.com> (raw)
In-Reply-To: <20261021110700.493315-2-fuad.tabba@linux.dev>
On Wed, Oct 21, 2026 at 12:06:57PM +0100, Fuad Tabba wrote:
> sanitise_mte_tags() clears the tags of the pages about to be mapped at
> stage-2 before marking them tagged. For a hugetlb folio the flag covers
> every page in the folio, but the loop only covers the mapping being
> installed. Stage-2 maps a folio in pieces for the contiguous hugetlb
> sizes, and for any size under dirty logging. The first fault then marks
> the whole folio after clearing only its own piece, and the rest keeps
> its previous owner's tags for the guest to read.
>
> Clear the whole folio, as mte_sync_tags() does.
>
> Fixes: 25c17c4b55def ("hugetlb: arm64: add mte support")
> Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
> Cc: stable@vger.kernel.org
> Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2026-10-29 21:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 11:06 [PATCH v2 0/4] KVM: arm64: Fix stale MTE tags reaching a guest Fuad Tabba
2026-10-21 11:06 ` [PATCH v2 1/4] KVM: arm64: Clear the whole hugetlb folio when sanitising MTE tags Fuad Tabba
2026-10-29 21:44 ` Catalin Marinas [this message]
2026-10-21 11:06 ` [PATCH v2 2/4] KVM: arm64: Clear the whole hugetlb folio when storing " Fuad Tabba
2026-10-29 22:01 ` Catalin Marinas
2026-10-21 11:06 ` [PATCH v2 3/4] KVM: arm64: Sanitise MTE tags when a permission fault installs a mapping Fuad Tabba
2026-10-29 22:04 ` Catalin Marinas
2026-10-21 11:07 ` [PATCH v2 4/4] arm64: mte: Add mte_clear_folio_tags() Fuad Tabba
2026-10-21 12:28 ` Lorenzo Stoakes (ARM)
2026-10-29 22:05 ` Catalin Marinas
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