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Fri, 21 Aug 2026 07:51:35 -0400 (EDT) Date: Fri, 21 Aug 2026 12:51:34 +0100 From: Kiryl Shutsemau To: Breno Leitao Cc: Ard Biesheuvel , Ilias Apalodimas , Miaohe Lin , Naoya Horiguchi , Andrew Morton , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rmikey@meta.com, riel@surriel.com, kexec@lists.infradead.org, kernel-team@meta.com Subject: Re: [PATCH v2 2/6] efi: add the LINUX_EFI_POISONED_MEMORY configuration table Message-ID: References: <20260821-hwpoison-kho-v2-0-5743791e48e6@debian.org> <20260821-hwpoison-kho-v2-2-5743791e48e6@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260821-hwpoison-kho-v2-2-5743791e48e6@debian.org> X-Rspamd-Queue-Id: D3465C0007 X-Rspam-User: X-Stat-Signature: pfppowomu7zefnx4fymzgnnbsdnur4xi X-Rspamd-Server: rspam06 X-HE-Tag: 1787313101-118911 X-HE-Meta: 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 cfvSBLTo 9xSr5ryI8rbwlRhplJ87gP4/nmqdpeN1NAMTD2ZHUP2LcUi9TLKKyboAMXL9teUh5H82SRb6FXB7mcIw/4Rq3HAdgbDofReLIWtbLnKAtFimC2sOdZtqgvtDMw53HKDwp4nvoNuPYWSad+tN7c/fs09T9qCelV70DBfvLjY/lROMDeTMm/wFMxogU1WEwyT6wLiyF0+aeZ6DvjBylP85mrLmD1yF412LcK56pT6tRN0kiWpaXWD4TUPKsAhH68P2CNMFyzmdnQ6Y4IEAI3P8c9uXajy/0gYmiMqWepAt/Z+MoZujAmT352TzpMneNOgTJ9FMdDXrZRgoT+sDUFOmHtuE7Nu9y2oHb4H9/5Zs8XDx07OJpqYQ1nKpgU2O9o5usG1UadeLIp1Qr7z/B5B4myR9Y9g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Aug 21, 2026 at 03:06:02AM -0700, Breno Leitao wrote: > diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig > index 29e0729299f5b..69c0dc02bc112 100644 > --- a/drivers/firmware/efi/Kconfig > +++ b/drivers/firmware/efi/Kconfig > @@ -263,6 +263,16 @@ config EFI_COCO_SECRET > virt/coco/efi_secret module to access the secrets, which in turn > allows userspace programs to access the injected secrets. > > +config EFI_POISONED_MEMORY > + bool "Carry hardware-poisoned pages across kexec" > + depends on EFI_STUB && MEMORY_FAILURE && 64BIT > + help > + Record page frames that are hardware-poisoned while this kernel runs > + into an EFI configuration table, and honor that table early on the > + next kernel so a kexec does not hand known-bad RAM back out. > + > + If unsure, say N. > + Do we want to make it conditional? Maybe just for everyone with EFI_STUB && MEMORY_FAILURE? Where 64BIT limitation comes from? -- Kiryl Shutsemau / Kirill A. Shutemov