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[34.150.200.138]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7cd466fc2afsm18218685a.0.2025.05.15.11.23.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 May 2025 11:23:28 -0700 (PDT) From: Pasha Tatashin To: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.com, changyuanl@google.com, pasha.tatashin@soleen.com, rppt@kernel.org, dmatlack@google.com, rientjes@google.com, corbet@lwn.net, rdunlap@infradead.org, ilpo.jarvinen@linux.intel.com, kanie@linux.alibaba.com, ojeda@kernel.org, aliceryhl@google.com, masahiroy@kernel.org, akpm@linux-foundation.org, tj@kernel.org, yoann.congal@smile.fr, mmaurer@google.com, roman.gushchin@linux.dev, chenridong@huawei.com, axboe@kernel.dk, mark.rutland@arm.com, jannh@google.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, dan.j.williams@intel.com, david@redhat.com, joel.granados@kernel.org, rostedt@goodmis.org, anna.schumaker@oracle.com, song@kernel.org, zhangguopeng@kylinos.cn, linux@weissschuh.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, gregkh@linuxfoundation.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rafael@kernel.org, dakr@kernel.org, bartosz.golaszewski@linaro.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, yesanishhere@gmail.com, Jonathan.Cameron@huawei.com, quic_zijuhu@quicinc.com, aleksander.lobakin@intel.com, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, leon@kernel.org, lukas@wunner.de, bhelgaas@google.com, wagi@kernel.org, djeffery@redhat.com, stuart.w.hayes@gmail.com, ptyadav@amazon.de Subject: [RFC v2 02/16] kho: allow to drive kho from within kernel Date: Thu, 15 May 2025 18:23:06 +0000 Message-ID: <20250515182322.117840-3-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.49.0.1101.gccaa498523-goog In-Reply-To: <20250515182322.117840-1-pasha.tatashin@soleen.com> References: <20250515182322.117840-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Stat-Signature: gdbkh8ek6kixqidxpyygwsy55dci5dzk X-Rspamd-Queue-Id: 667931C0005 X-Rspam-User: X-HE-Tag: 1747333410-319860 X-HE-Meta: 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 u1eK9vlx Lg+9vRg5iF1pPVOsAHjJwH3+ya1200j3NMnYhVnDd1viuZOqizw2AEfFnUX0F9hTF9J4Rov4jlhSRaGEd9/5GT4YgD1PGvhIZv0UC276oZwwxFyGPjRpJCsdGr2jiTMZhOPUsV0UJbRJlxOp5OE/glYylJxRAY0n/nMhtsRYDxTJfFXrNRcFHkMISUbgkJDHHRmWa7When1VuEVIwI6Bd7wTjMvUDWEsgBctuXduVQmJVwqvXHrMU+Nu5uq1bN/oIKeo7SklVDamIIYNYbCrJeMubKD/ez3pPHaKyq6pj7hLnZCgqDFN2/81JaU7VNaIlWHjCzWcOV3em5qBL1TDGrEZf6pCc1r4kLDnyny+CUXWgJa1Lh78257dEuXMykmkBYgRTNX+txKVPRpTNSAZtZ/DOIdMOAp1bztfeLGjGM2REoZOaevjj5IfbUhD2+6XNjmHwOmoxLsJ79sY= 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: Allow to do finalize and abort from kernel modules, so LUO could drive the KHO sequence via its own state machine. Signed-off-by: Pasha Tatashin --- include/linux/kexec_handover.h | 15 +++++++++ kernel/kexec_handover.c | 54 ++++++++++++++++++++++++++++++++ kernel/kexec_handover_debug.c | 2 +- kernel/kexec_handover_internal.h | 2 ++ 4 files changed, 72 insertions(+), 1 deletion(-) diff --git a/include/linux/kexec_handover.h b/include/linux/kexec_handover.h index 348844cffb13..f98565def593 100644 --- a/include/linux/kexec_handover.h +++ b/include/linux/kexec_handover.h @@ -54,6 +54,10 @@ void kho_memory_init(void); void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_phys, u64 scratch_len); + +int kho_finalize(void); +int kho_abort(void); + #else static inline bool kho_is_enabled(void) { @@ -104,6 +108,17 @@ static inline void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_phys, u64 scratch_len) { } + +static inline int kho_finalize(void) +{ + return -EOPNOTSUPP; +} + +static inline int kho_abort(void) +{ + return -EOPNOTSUPP; +} + #endif /* CONFIG_KEXEC_HANDOVER */ #endif /* LINUX_KEXEC_HANDOVER_H */ diff --git a/kernel/kexec_handover.c b/kernel/kexec_handover.c index 5b65970e9746..8ff561e36a87 100644 --- a/kernel/kexec_handover.c +++ b/kernel/kexec_handover.c @@ -734,6 +734,60 @@ int __kho_finalize(void) return err; } +int kho_finalize(void) +{ + int ret = 0; + + if (!kho_enable) + return -EOPNOTSUPP; + + mutex_lock(&kho_out.lock); + + if (kho_out.finalized) { + ret = -EEXIST; + goto unlock; + } + + ret = __kho_finalize(); + if (ret) + goto unlock; + + kho_out.finalized = true; + ret = kho_out_update_debugfs_fdt(); + +unlock: + mutex_unlock(&kho_out.lock); + return ret; +} +EXPORT_SYMBOL_GPL(kho_finalize); + +int kho_abort(void) +{ + int ret = 0; + + if (!kho_enable) + return -EOPNOTSUPP; + + mutex_lock(&kho_out.lock); + + if (!kho_out.finalized) { + ret = -ENOENT; + goto unlock; + } + + ret = __kho_abort(); + if (ret) + goto unlock; + + kho_out.finalized = false; + ret = kho_out_update_debugfs_fdt(); + +unlock: + mutex_unlock(&kho_out.lock); + return ret; +} +EXPORT_SYMBOL_GPL(kho_abort); + struct kho_in kho_in = { .fdt_list = LIST_HEAD_INIT(kho_in.fdt_list), }; diff --git a/kernel/kexec_handover_debug.c b/kernel/kexec_handover_debug.c index 696131a3480f..a15c238ec98e 100644 --- a/kernel/kexec_handover_debug.c +++ b/kernel/kexec_handover_debug.c @@ -55,7 +55,7 @@ int kho_debugfs_fdt_add(struct kho_serialization *ser, const char *name, fdt); } -static int kho_out_update_debugfs_fdt(void) +int kho_out_update_debugfs_fdt(void) { int err = 0; struct fdt_debugfs *ff, *tmp; diff --git a/kernel/kexec_handover_internal.h b/kernel/kexec_handover_internal.h index 65ff0f651192..0b534758d39d 100644 --- a/kernel/kexec_handover_internal.h +++ b/kernel/kexec_handover_internal.h @@ -60,6 +60,7 @@ void kho_in_debugfs_init(const void *fdt); int kho_out_debugfs_init(void); int kho_debugfs_fdt_add(struct kho_serialization *ser, const char *name, const void *fdt); +int kho_out_update_debugfs_fdt(void); #else static inline int kho_debugfs_init(void) { return 0; } static inline void kho_in_debugfs_init(const void *fdt) { } @@ -67,6 +68,7 @@ static inline int kho_out_debugfs_init(void) { return 0; } static inline int kho_debugfs_fdt_add(struct kho_serialization *ser, const char *name, const void *fdt) { return 0; } +static inline int kho_out_update_debugfs_fdt(void) { return 0; } #endif /* CONFIG_KEXEC_HANDOVER_DEBUG */ #endif /* LINUX_KEXEC_HANDOVER_INTERNAL_H */ -- 2.49.0.1101.gccaa498523-goog