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[34.85.247.235]) by smtp.gmail.com with ESMTPSA id 00721157ae682-719532c7e4fsm30482117b3.72.2025.07.23.07.47.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Jul 2025 07:47:01 -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, lennart@poettering.net, brauner@kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, saeedm@nvidia.com, ajayachandra@nvidia.com, jgg@nvidia.com, parav@nvidia.com, leonro@nvidia.com, witu@nvidia.com Subject: [PATCH v2 04/32] kho: allow to drive kho from within kernel Date: Wed, 23 Jul 2025 14:46:17 +0000 Message-ID: <20250723144649.1696299-5-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.50.0.727.gbf7dc18ff4-goog In-Reply-To: <20250723144649.1696299-1-pasha.tatashin@soleen.com> References: <20250723144649.1696299-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 52C71C0005 X-Stat-Signature: reeosbty65e9uj3yxakc38bdmndh648c X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1753282023-596759 X-HE-Meta: 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 zIpqHJQk E2jJM637uIJdqY/VQQMiSX1IyENTdigU92spIrmZ7swUP3PmG/uJ4BPDGOl3PaZ2uPScwf+LbA9LEbZ/xhJVfDW745E29s7kbEu3msLj0VnmMs0jUTfyTSuAqw3kOBbzVfvqCc+dZF5imNIk20k1z4fPWp9sioL8wCAAFBhMSsOj9Zzv/O8dHWhNae8uaSzEXHqcp 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 | 58 ++++++++++++++++++++++++++++++++-- 2 files changed, 71 insertions(+), 2 deletions(-) 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 368e23db0a17..c6ccc8e0705d 100644 --- a/kernel/kexec_handover.c +++ b/kernel/kexec_handover.c @@ -757,7 +757,7 @@ static int kho_out_update_debugfs_fdt(void) return err; } -static int kho_abort(void) +static int __kho_abort(void) { int err; unsigned long order; @@ -790,7 +790,34 @@ static int kho_abort(void) return err; } -static int kho_finalize(void) +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); + +static int __kho_finalize(void) { int err = 0; u64 *preserved_mem_map; @@ -839,6 +866,33 @@ static 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); + static int kho_out_finalize_get(void *data, u64 *val) { mutex_lock(&kho_out.lock); -- 2.50.0.727.gbf7dc18ff4-goog