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AJvYcCWay1cf0fl3GGkmYg1L9m1+ec+2UYXUwFAvPUXEZe+4y2lRIGH2Q6Y2bWOwqP2+yz1XGUobRFx8iw==@kvack.org X-Gm-Message-State: AOJu0YyN4bdGOpiFh4J8ewaOwvYEg/t1nlcZ1vNkiA76saELkt8xHCQa lbV3d1Z6ZCDoC49wjCY9AzAsfEvdmmQwD2OEl0QTILHxfdmjsVyg7ymFdfsE549pVrLypB7aeZG PvqPk+o6+fqXwNf615w== X-Google-Smtp-Source: AGHT+IFcU+yi4lxCzXOaIz4vfStLTel++2NEV8ETDNWjCPUfioyFnhkypPSIgZhYN5NQ0+YhGSBWxvTzxUTVFzWV X-Received: from plez17.prod.google.com ([2002:a17:902:ccd1:b0:220:e022:1e84]) (user=changyuanl job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:e744:b0:22d:b240:34c9 with SMTP id d9443c01a7336-22fc91a9093mr42800435ad.53.1746776829073; Fri, 09 May 2025 00:47:09 -0700 (PDT) Date: Fri, 9 May 2025 00:46:26 -0700 In-Reply-To: <20250509074635.3187114-1-changyuanl@google.com> Mime-Version: 1.0 References: <20250509074635.3187114-1-changyuanl@google.com> X-Mailer: git-send-email 2.49.0.1015.ga840276032-goog Message-ID: <20250509074635.3187114-9-changyuanl@google.com> Subject: [PATCH v8 08/17] kexec: add config option for KHO From: Changyuan Lyu To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org Cc: anthony.yznaga@oracle.com, arnd@arndb.de, ashish.kalra@amd.com, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, corbet@lwn.net, dave.hansen@linux.intel.com, devicetree@vger.kernel.org, dwmw2@infradead.org, ebiederm@xmission.com, graf@amazon.com, hpa@zytor.com, jgowans@amazon.com, kexec@lists.infradead.org, krzk@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mark.rutland@arm.com, mingo@redhat.com, pasha.tatashin@soleen.com, pbonzini@redhat.com, peterz@infradead.org, ptyadav@amazon.de, robh@kernel.org, rostedt@goodmis.org, rppt@kernel.org, saravanak@google.com, skinsburskii@linux.microsoft.com, tglx@linutronix.de, thomas.lendacky@amd.com, will@kernel.org, x86@kernel.org, Changyuan Lyu Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 546DBA0002 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: 94uwfw35aiombkjhai5aust6zsqiz6sm X-HE-Tag: 1746776830-268248 X-HE-Meta: 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 PdSoOmkq 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Alexander Graf We have all generic code in place now to support Kexec with KHO. This patch adds a config option that depends on architecture support to enable KHO support. Signed-off-by: Alexander Graf Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) Signed-off-by: Changyuan Lyu --- kernel/Kconfig.kexec | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec index 4d111f8719516..4fa212909d699 100644 --- a/kernel/Kconfig.kexec +++ b/kernel/Kconfig.kexec @@ -95,6 +95,20 @@ config KEXEC_JUMP Jump between original kernel and kexeced kernel and invoke code in physical address mode via KEXEC +config KEXEC_HANDOVER + bool "kexec handover" + depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE + select MEMBLOCK_KHO_SCRATCH + select KEXEC_FILE + select DEBUG_FS + select LIBFDT + select CMA + help + Allow kexec to hand over state across kernels by generating and + passing additional metadata to the target kernel. This is useful + to keep data or state alive across the kexec. For this to work, + both source and target kernels need to have this option enabled. + config CRASH_DUMP bool "kernel crash dumps" default ARCH_DEFAULT_CRASH_DUMP -- 2.49.0.1015.ga840276032-goog