From: Kiryl Shutsemau <kas@kernel.org>
To: Breno Leitao <leitao@debian.org>
Cc: Ard Biesheuvel <ardb@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
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 6/6] efi: respect the poisoned pages coming from previous kernel
Date: Fri, 21 Aug 2026 13:13:55 +0100 [thread overview]
Message-ID: <aog_uH5fTsJzXjjx@thinkstation> (raw)
In-Reply-To: <20260821-hwpoison-kho-v2-6-5743791e48e6@debian.org>
On Fri, Aug 21, 2026 at 03:06:06AM -0700, Breno Leitao wrote:
> + /* Reserve the table itself so it survives a further kexec. */
> + memblock_reserve(PAGE_ALIGN_DOWN(ppm),
> + PAGE_ALIGN(ppm + sizeof(*pm) + bitmap_size) -
> + PAGE_ALIGN_DOWN(ppm));
Hm. I don't think it is enough.
On x86, kernel doesn't keep memblock around after boot (see
CONFIG_ARCH_KEEP_MEMBLOCK). Reserving in memblock exclude the memory
from page allocator. But kexec can place the image there.
For !CONFIG_ARCH_KEEP_MEMBLOCK, kexec uses walk_system_ram_res() that
looks into iomem_resource. And memblock does nothing to exclude the
memory from iomem_resource.
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2026-08-21 12:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-21 10:06 [PATCH v2 0/6] efi: mm/memory-failure: keep hardware-poisoned pages out of the next kexec Breno Leitao
2026-08-21 10:06 ` [PATCH v2 1/6] efi/libstub: add a helper for the top of usable RAM Breno Leitao
2026-08-21 11:04 ` Kiryl Shutsemau
2026-08-21 10:06 ` [PATCH v2 2/6] efi: add the LINUX_EFI_POISONED_MEMORY configuration table Breno Leitao
2026-08-21 11:51 ` Kiryl Shutsemau
2026-08-21 12:03 ` Pratyush Yadav
2026-08-21 14:11 ` Breno Leitao
2026-08-21 14:04 ` Breno Leitao
2026-08-21 10:06 ` [PATCH v2 3/6] efi/libstub: add the poisoned-memory EFI table Breno Leitao
2026-08-21 10:06 ` [PATCH v2 4/6] efi/libstub: install the poisoned-memory table from the stub Breno Leitao
2026-08-21 10:06 ` [PATCH v2 5/6] efi: record hardware-poisoned frames into the poisoned-memory table Breno Leitao
2026-08-21 10:06 ` [PATCH v2 6/6] efi: respect the poisoned pages coming from previous kernel Breno Leitao
2026-08-21 12:13 ` Kiryl Shutsemau [this message]
2026-08-21 14:03 ` Breno Leitao
2026-08-21 14:53 ` Kiryl Shutsemau
2026-08-21 10:29 ` [PATCH v2 0/6] efi: mm/memory-failure: keep hardware-poisoned pages out of the next kexec Kiryl Shutsemau
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