From: sashiko-bot@kernel.org
To: "Breno Leitao" <leitao@debian.org>,
"Ard Biesheuvel" <ardb@kernel.org>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
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x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
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kas@kernel.org, kexec@lists.infradead.org,
"Brendan Jackman" <brendan.jackman@linux.dev>,
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shakeel.butt@linux.dev
Cc: rmikey@meta.com, riel@surriel.com, harry@kernel.org,
kernel-team@meta.com
Subject: Re: [PATCH v6 1/7] mm/memory-failure: efi: add the LINUX_EFI_POISONED_MEMORY configuration table
Date: Fri, 16 Oct 2026 12:22:54 +0000 [thread overview]
Message-ID: <sashiko-outbox-174289@kernel.org> (raw)
In-Reply-To: <20261016-hwpoison-kho-v6-1-f304255147da@debian.org>
> Hardware-poisoned page frames are tracked only in the running kernel's
> data structures, so a kexec loses them and the next kernel doesn't have
> this information, thus, tripping into them again.
>
> Add an EFI configuration table to carry that information across kexec.
>
> It is a bitmap with one bit per EFI_POISON_UNIT_SIZE (2MiB) of physical
> memory starting at phys_base, modeled on the LINUX_EFI_UNACCEPTED_MEMORY
> table, and it rides the EFI system table to every kernel in the chain.
> Basing the bitmap keeps a machine whose RAM starts high from paying for
> the hole below it.
>
> List the table in the x86 efi_tables[] too, so an SME host maps it
> unencrypted like every other EFI table.
>
> [ ... ]
> EFI_STUB && 64BIT is little-endian everywhere: arm64 turns EFI off under
> CPU_BIG_ENDIAN, and no other architecture with the stub is big-endian.
>
> Suggested-by: Kiryl Shutsemau <kas@kernel.org>
> Signed-off-by: Breno Leitao <leitao@debian.org>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261016-hwpoison-kho-v6-0-f304255147da@debian.org?part=1
next prev parent reply other threads:[~2026-10-16 12:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-16 12:15 [PATCH v6 0/7] mm/memory-failure: keep hardware-poisoned pages out of the next kexec Breno Leitao
2026-10-16 12:15 ` [PATCH v6 1/7] mm/memory-failure: efi: add the LINUX_EFI_POISONED_MEMORY configuration table Breno Leitao
2026-10-16 12:22 ` sashiko-bot [this message]
2026-10-16 12:15 ` [PATCH v6 2/7] mm/memory-failure: libstub: install the poisoned-memory EFI table Breno Leitao
2026-10-16 12:24 ` sashiko-bot
2026-10-16 12:15 ` [PATCH v6 3/7] mm/memory-failure: add hwpoison_boot_page() to flag an inherited frame Breno Leitao
2026-10-16 12:29 ` sashiko-bot
2026-10-16 12:15 ` [PATCH v6 4/7] mm/memblock: add a reserved-region flag for poisoned frames Breno Leitao
2026-10-16 12:26 ` sashiko-bot
2026-10-16 12:15 ` [PATCH v6 5/7] drivers/base/memory: count the poison a block already holds when creating it Breno Leitao
2026-10-16 12:30 ` sashiko-bot
2026-10-16 12:15 ` [PATCH v6 6/7] mm/memory-failure: efi: reserve the inherited poisoned-memory units Breno Leitao
2026-10-16 12:24 ` sashiko-bot
2026-10-16 12:15 ` [PATCH v6 7/7] mm/memory-failure: efi: record hardware-poisoned frames into the poisoned-memory table Breno Leitao
2026-10-16 12:28 ` sashiko-bot
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