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Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XDWAIMZ_1793006149 cluster:ay36) by smtp.aliyun-inc.com; Mon, 26 Oct 2026 17:15:53 +0800 From: Chen Pei To: sashiko-bot@kernel.org Cc: alex@ghiti.fr, graf@amazon.com, guoren@kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, palmer@dabbelt.com, pasha.tatashin@soleen.com, pjw@kernel.org, pratyush@kernel.org, rppt@kernel.org, sashiko-reviews@lists.linux.dev, shuah@kernel.org Subject: Re: [PATCH 2/4] riscv: Add support for kexec handover (KHO) Date: Mon, 26 Oct 2026 17:15:47 +0800 Message-ID: <20261026091550.9348-1-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: <20261023111612.2134-1-cp0613@linux.alibaba.com> <20261023111612.2134-3-cp0613@linux.alibaba.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 5F3EE160008 X-Stat-Signature: uhba6hc7jwzbqodwcn91urux9j1wn94p X-Rspam-User: X-Spam-Status: No, score=-16.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=4.0.1 X-HE-Tag: 1793006156-137600 X-HE-Meta: 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 5nvT4Blx p2b+xOucOOFEYaumKoC1Iqc1y8hHv80INxpeNl0N8ZlGad5HrI2zMQeZ192bIJuyVpys1dcVqyuUn7ylytkq3Qp+S+G2E9e8zuXHC0mqXVD5QwHHHxOVnd0wd2gPLvGVtYQTJMwZg3rDYW/uqdMaUy20rjF0EA+9Mk+IjU7AhPaOOFkBPwVXylj27E3ZEXBsZBVTLcoeb09VFduUwi2xA5MkmM8uF273NITM4buyWTn3W5eb6rXJiXZ+FQ/I1p54rIGQTRnQ28YAmHBU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 > [Severity: High] > Can enabling ARCH_SUPPORTS_KEXEC_HANDOVER trigger a BUG_ON() in > linear_mapping_pa_to_va() during efi_init() when booting a KHO kexec > kernel on a 64-bit RISC-V UEFI system? Confirmed. Reproduced on qemu virt booting through edk2 with DEBUG_VIRTUAL enabled and "kho=on" on the outgoing kernel: the first handover dies in the incoming one during EFI setup, before the console registers, so it stays silent without an earlycon. This will be fixed in v2. > [Severity: Medium] > Also, will kho_reserve_bootmem() fail on 64-bit RISC-V platforms > where DRAM starts at or above 4 GiB, or record a 0-byte region when > all DRAM lies below 4 GiB? Confirmed, both halves. That is generic KHO code, not the riscv enablement, so I will send a separate patch for it. Best regards, Chen