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h=From:To:Cc:Subject:In-Reply-To:References:Date; b=FW9VNZWWcJRWeOTsfqG/VhlOIWFBxJVwe8qQ5oJ/6a+dgxXFiuOpleuNfo9Kkc0oN fHUnbSoLU47lPBjGpbLd+GTnToWJMfgE8eYvsOwQyYGZoyeRKRZDW5gVfbv8ptCjeP mJaQcjqZeExwsqMZ75PrZ4/GkUrYy5pePxw9k1XndOqQ2MTJN0p6wU8vJuqI5d6Z85 h9addDWDBzemyOtuPqhXh3Gw3q8MMCJie0Q6FJA1FuutruSnBMf5KBF7Ryb4po7Pba R1geGg21BhmJ+PWE32ng98qsO9u0picoefL+3Pl3+RVNqPH4ZPWk+VylifnTNONXTY zQtrFIATDMPbQ== From: Pratyush Yadav To: Kiryl Shutsemau Cc: Breno Leitao , 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 In-Reply-To: (Kiryl Shutsemau's message of "Fri, 21 Aug 2026 12:51:34 +0100") References: <20260821-hwpoison-kho-v2-0-5743791e48e6@debian.org> <20260821-hwpoison-kho-v2-2-5743791e48e6@debian.org> Date: Fri, 21 Aug 2026 14:03:30 +0200 Message-ID: <2vxz5x13znn1.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 6C55E180014 X-Stat-Signature: bg7dspj5fj1bf7czjap7de8fjbx38bt4 X-HE-Tag: 1787313815-943280 X-HE-Meta: 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 LfRQ6o/X jvRtya2rYHuJb8TW0x30BGDh2Z8KQ9ugp6F3OHPzw7XJ8RXD1kqgcuLg3qSvCqcBkrxGurWPyd5j9+vdF44V74wh7ehayvHpZAKhEf2FUdpp99ozOgcnKsAI28wcww7sP9QEjJwNUc/rvefi0vmKOShB3O8tWQFfzY3i2dK3nBvdN5F71rFvGRSUC9zgPRVhE1sYw42LDPYxd5c8Jaen+oMGWsicyTHIWavsiCHElbOT51AX88X5HczR7LFA4jQ/ZgHBCUU5kiOjolyw7OD9cJ8j4+rrwT5NBlpmbuIpiJ/Nr356D6iLf2ZH94eiIxW+vNuamEdWfIKQkAV0= 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, Kiryl Shutsemau wrote: > 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? +1. Each config we add is a decision someone has to make when compiling the kernel. If they rely on the default, they will miss out on this fairly useful feature. So, is there any downside to just doing this by default without any config? -- Regards, Pratyush Yadav