[PATCH v3 2/4] riscv: Add support for kexec handover (KHO)

From: Chen Pei <cp0613@linux.alibaba.com>
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 v3 2/4] riscv: Add support for kexec handover (KHO)
Date: Fri,  6 Nov 2026 15:14:57 +0800	[thread overview]
Message-ID: <20261106071459.2003-3-cp0613@linux.alibaba.com> (raw)
In-Reply-To: <20261106071459.2003-1-cp0613@linux.alibaba.com>

The generic handover paths are already in place on RISC-V: the outgoing
kernel publishes the handover FDT and the bootmem list in /chosen of the
DTB built by of_kexec_alloc_and_setup_fdt(), and the incoming kernel
picks both up while scanning that node. Only the architecture symbol is
missing.

Set it to 64BIT && MMU: ARCH_SUPPORTS_KEXEC_FILE is already 64BIT only,
and KEXEC_HANDOVER selects CMA, which depends on MMU.

Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
---
 arch/riscv/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index bde1f1885038..bffef6b903e1 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


