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Fri, 21 Aug 2026 08:13:56 -0400 (EDT) Date: Fri, 21 Aug 2026 13:13:55 +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 6/6] efi: respect the poisoned pages coming from previous kernel Message-ID: References: <20260821-hwpoison-kho-v2-0-5743791e48e6@debian.org> <20260821-hwpoison-kho-v2-6-5743791e48e6@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260821-hwpoison-kho-v2-6-5743791e48e6@debian.org> X-Rspam-User: X-Stat-Signature: y53xcd685fifqbdwut34j8ms19g1zssx X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 2AF6B20002 X-HE-Tag: 1787314442-923249 X-HE-Meta: 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 JFVGnazC Yjk01K+2cwd0uuzClSjl4Mh8nyyVPOalrKm2XWLo4nDzVrTUGoPMZ9IdtoXmz3DUktvlw41uA1gqraEiFazdofglnJxRXrQLGIRRYrmcREp7LDgC9CaTb6pCD/esNJetetZvRMeLxuztovKUZ0PgIUSdyVSGlQ1S3uAXUqmQqHmoFYPPEYvFMVvZw9KLVDmOwaLu2vd9wOwU9ybwiT3RdnQeoYrCQlB5lPbmk/yuWmUgk5XUoe0MoprfN9H02q91Y//w80VAN6JOWdDHhOWAtzLbuSu6xngE69oe0hOvp/il90Jq5vHCar4leZKQEm4QQEifyPRfmXAJr7rpS9Dj78qD/mwh48d2WrgY1 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 03:06:06AM -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