From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3E703606A31A for ; Sun, 25 Oct 2026 17:57:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=GCBNcE9x; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Lgogj7v4 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Date: Content-Transfer-Encoding:Content-Type:References:In-Reply-To:To:Subject:From :Message-ID:Cc:MIME-Version:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; 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Sun, 25 Oct 2026 17:57:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792951021; bh=fQZ0aBG43l9gHzJfLFUvUfmdnBCRo9j/mwX0/KqYRZ0=; h=From:Subject:Reply-To:To:In-Reply-To:References:Date; b=Lgogj7v4k2kn/PjSkPhBGSLE+XjVsmHFNz4k0tXPkK9NASXBvHB8Qk0OhnLWxzEJD km2qTJfPqZaDeS3I9KCdZV3U6kWrNIYNNhOL7uRREJkAgHOY4VSX6uNAeENN8toaNh Eaa1HsltHC+0yGwbtY+fQ8BrJUhONLNUsC/G6X2b7EYKFXGwkuFSs6bt29hBsO3cN6 WLMpMPBD2f+ho24+8daOsB/iYquW5DdV8RsIzTOgVFKxPlmh9UjtkXDVNfPkC3igH6 lCMVRXp2k3GOU5NtW6lVdVkeUOxrSCG57TogV2wkgBjvMj8l5lpEF4n7zT3d9/uCNo ZbJYLwEgRDcfQ== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH v2 5/9] kho: add read-only Kexec Handover mode To: "Pasha Tatashin" , rppt@kernel.org, kuba@kernel.org, enelsonmoore@gmail.com, bp@alien8.de, shuah@kernel.org, david@kernel.org, akpm@linux-foundation.org, ljs@kernel.org, mhocko@suse.com, skhan@linuxfoundation.org, vbabka@kernel.org, dapeng1.mi@linux.intel.com, corbet@lwn.net, surenb@google.com, kexec@lists.infradead.org, pratyush@kernel.org, rdunlap@infradead.org, elver@google.com, graf@amazon.com, lirongqing@baidu.com, liam@infradead.org, jlayton@kernel.org In-Reply-To: <20261025174017.3870481-6-pasha.tatashin@soleen.com> References: <20261025174017.3870481-1-pasha.tatashin@soleen.com> <20261025174017.3870481-6-pasha.tatashin@soleen.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Sun, 25 Oct 2026 17:57:00 +0000 X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev Sender: "kexec" X-Spam-Status: No, score=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 X-Archived-By: > Kernels that inspect preserved KHO state without taking ownership of > preserved memory need a way to traverse the KHO FDT, radix tree, and > vmalloc chains in place while leaving the underlying physical pages and > metadata unmodified. >=20 > Add CONFIG_KEXEC_HANDOVER_READONLY and the 'kho_ro=3D' kernel > command-line parameter so both regular KHO and read-only KHO can be > compiled into the same kernel image and activated via the command line. > Map and validate the incoming KHO FDT once in an early_initcall, and > cache radix-tree node, leaf, folio, and vmalloc mappings in a unified > RCU-protected hash table (kho_ro_map_ht) for the lifetime of the > read-only KHO kernel. >=20 > Also export kho_is_ro(), kho_ro_lookup_folio_order(), > kho_ro_map_folio(), and kho_ro_map_vmalloc() so callers can check if > read-only KHO mode is active and map preserved folios and vmalloc > regions verified against the KHO radix tree. >=20 > Signed-off-by: Pasha Tatashin Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261025174017.3870= 481-1-pasha.tatashin@soleen.com?part=3D5