From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=115.124.30.124 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792754187; b=UZYrh/ZVw4VmfIxiarf4F1sBk9cZK+zK1pKnaDZvLVfexGIECxvW1kNHkvOZFWTmSje9 Clt3j8Nduip1m/OoJSxRXBGupnAKPFTWbnpJY6H5DwaUopfTYqB/k8eZLFZywOZ4AwQDl OrgxYNOnH6wOivMlNKodusm3bnq3mQZ8MOTz6Jdtxq+4G0qCu2GBE2GtsyHcSH0gSLWNN Nc5EQE4zwdZ5ABW10aMOitg8Lq9Hw1wbs9n6kztRwzb60ojlnT05pjf9W8azCrZktL1JN C6Py2OEjOzjXbH/KhIIdKixuTkf/6d/NLuDwFT1w4tfU7n7Xaa15qpGkBeQTHob3m7g== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792754187; h=DMARC-Filter:DKIM-Signature:X-Alimail-AntiSpam:Received:From:To:Cc: Subject:Date:Message-ID:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=PGqMJHk6LUVuJtb9sOmDDL50VOC0Sssl6rxAA31XIdA=; b=Y0pV6BAVOLV7DwHZJO74CTlDmuJ8TP7JcQsf0balRzwtYbWCAjXe3IcT/5h38BzGRxl5 xdO/TNGIw69UCcrtGTtG9fAqjOh+EoVJqV8BtxYQ3EyIEByFSSYHvSPLdmu0rmla4S+l1 hnZ6yvVuc3vgZT8KeOF+r3rfHeK++sH1F70IK/q8nEq14k2cmbDom8Cq5slcdINAmN30H vrIOecQ8s0oClbVCmmHHJDD+hONb+XCO6yKKrITxQJEcNTclkITeUiQ0XemQJr2OCXn3/ mCcapUldpR3zSznvek4YVbIrF0rI9B3qWovTti3QJxAci3MAt3G6kV2OH3AfcB4jKrA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass header.d=linux.alibaba.com header.i=@linux.alibaba.com header.a=rsa-sha256 header.s=default header.b=l3Zp4gkU; arc=none smtp.remote-ip=115.124.30.124 Received: from out30-124.freemail.mail.aliyun.com (out30-124.freemail.mail.aliyun.com [115.124.30.124]) (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 AF181606A31B; Fri, 23 Oct 2026 11:16:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org AF181606A31B Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.a=rsa-sha256 header.s=default header.b=l3Zp4gkU DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1792754183; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=PGqMJHk6LUVuJtb9sOmDDL50VOC0Sssl6rxAA31XIdA=; b=l3Zp4gkUxMeF3lIIPkCM/jGo5ZCCHJlORzXBc3zlZXSzIk8WuaFNHU5fYnEZHyrRHvpHPy657kgOr3cj0Dc45kIg85+jAQz97TjgWJ2pmybPVzPXU8GcrlH6Vj7DqoKah12F/wx5X6PjlguSPD66PmnGg2yWuRQYiptY3DD2ryM= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R151e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033032089153;MF=cp0613@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0XDM1n5k_1792754182; Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XDM1n5k_1792754182 cluster:ay36) by smtp.aliyun-inc.com; Fri, 23 Oct 2026 19:16:22 +0800 From: Chen Pei To: pjw@kernel.org, palmer@dabbelt.com, alex@ghiti.fr, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, graf@amazon.com, shuah@kernel.org Cc: guoren@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, kexec@lists.infradead.org Subject: [PATCH 2/4] riscv: Add support for kexec handover (KHO) Date: Fri, 23 Oct 2026 19:16:10 +0800 Message-ID: <20261023111612.2134-3-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261023111612.2134-1-cp0613@linux.alibaba.com> References: <20261023111612.2134-1-cp0613@linux.alibaba.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit KHO is architecture independent: the outgoing kernel publishes the handover FDT and the scratch descriptor array in the /chosen node of the DTB it builds for the incoming kernel (kho_add_chosen(), reached from of_kexec_alloc_and_setup_fdt()), and the incoming kernel picks both up while scanning that node (early_init_dt_check_kho() -> kho_populate()). RISC-V already builds that DTB in load_extra_segments() and passes it to the incoming kernel in a1, so only the architecture symbol is missing. Depend on 64BIT to match ARCH_SUPPORTS_KEXEC_FILE, and on MMU because KEXEC_HANDOVER selects CMA, which depends on MMU. Signed-off-by: Chen Pei --- arch/riscv/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 5874ca30f4f6..4f7d2f3f80b1 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -1125,6 +1125,9 @@ config ARCH_SELECTS_KEXEC_FILE config ARCH_SUPPORTS_KEXEC_PURGATORY def_bool ARCH_SUPPORTS_KEXEC_FILE +config ARCH_SUPPORTS_KEXEC_HANDOVER + def_bool 64BIT && MMU + config ARCH_SUPPORTS_CRASH_DUMP def_bool y -- 2.50.1