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Fri, 04 Sep 2026 10:10:35 +0000 X-Mizu-Trace-ID: 031a72623a973772 X-Migadu-Flow: FLOW_OUT From: George Guo To: rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, chenhuacai@kernel.org, ardb@kernel.org, shuah@kernel.org Cc: ilias.apalodimas@linaro.org, akpm@linux-foundation.org, baoquan.he@linux.dev, ruirui.yang@linux.dev, guodongtai@kylinos.cn, kernel@xen0n.name, graf@amazon.com, liukexin@kylinos.cn, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-efi@vger.kernel.org Subject: [PATCH v5 4/5] LoongArch: enable kexec handover (KHO) Date: Fri, 4 Sep 2026 18:08:51 +0800 Message-ID: <20260904100852.26006-5-dongtai.guo@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260904100852.26006-1-dongtai.guo@linux.dev> References: <20260904100852.26006-1-dongtai.guo@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5F6FC40003 X-Stat-Signature: b4mpn44rzaqd9dcdo9q1jhcqn6bjarr8 X-HE-Tag: 1788516637-547649 X-HE-Meta: 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 FDwdmV5+ VGzczRRovnwVnCUnVAhCG3o5xoAVQVdoaNKe2h3DPtmU6oMvmnWCRfVORX/blU7LRHPr/QzmrNXnBlmWAWohPYy6yhcUoXiVEFI7hIsxYNPxDjCtJKogPIurEwy9o+mR6iUAq3pF6I81gIcnthOmZtVNuqcNgNnbbc7/mfmLCnSm6FshYD5vCATAu++IeJbhfK4iWrLYlRStBk7eD51uXkg3oupqwW67E9i+C Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: George Guo Enable ARCH_SUPPORTS_KEXEC_HANDOVER for 64-bit LoongArch. It selects EFI_KHO whenever KEXEC_HANDOVER is enabled, so LoongArch uses the architecture-agnostic EFI configuration table channel (LINUX_EFI_KEXEC_HANDOVER_GUID) introduced by this series to carry the KHO state across kexec. LoongArch boots through EFI without a device tree, so it cannot use the /chosen FDT path that arm64 and riscv use; the EFI configuration table channel is its handover transport. No arch-specific setup.c reader or machine_kexec_file.c writer is needed -- both live in the generic EFI code. Co-developed-by: Kexin Liu Signed-off-by: Kexin Liu Signed-off-by: George Guo --- arch/loongarch/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index a21f51e5815e..5eaa65578d58 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -685,6 +685,10 @@ config ARCH_SUPPORTS_KEXEC config ARCH_SUPPORTS_KEXEC_FILE def_bool 64BIT +config ARCH_SUPPORTS_KEXEC_HANDOVER + def_bool 64BIT && EFI_STUB + select EFI_KHO if KEXEC_HANDOVER + config ARCH_SELECTS_KEXEC_FILE def_bool 64BIT depends on KEXEC_FILE -- 2.53.0