From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 975B3C87FCB for ; Thu, 7 Aug 2025 01:45:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 59C456B0098; Wed, 6 Aug 2025 21:44:56 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5239A6B0099; Wed, 6 Aug 2025 21:44:56 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 412506B009A; Wed, 6 Aug 2025 21:44:56 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 32D136B0098 for ; Wed, 6 Aug 2025 21:44:56 -0400 (EDT) Received: from smtpin30.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id F2EA4136282 for ; Thu, 7 Aug 2025 01:44:55 +0000 (UTC) X-FDA: 83748267750.30.6DE4CDD Received: from mail-qt1-f175.google.com (mail-qt1-f175.google.com [209.85.160.175]) by imf26.hostedemail.com (Postfix) with ESMTP id 20CB1140006 for ; Thu, 7 Aug 2025 01:44:53 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=hvZ3FnWj; dmarc=pass (policy=reject) header.from=soleen.com; spf=pass (imf26.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.160.175 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1754531094; a=rsa-sha256; cv=none; b=BU6IbUrpP2jl9lhpkHtSe4mBMuGic5/Pbu/eeSsF65FgHuzdZHGe3GJqQGO59dWYgT6dwb I9JfTKSZ/XozbSz58d2I4jsg7nz4AawcAfnes/aSieljf++0a3Oz0yOtT/ozGkLiuTRzQO Un21h7Qjbo67AyFwpJJAosxCQ52rtkU= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=hvZ3FnWj; dmarc=pass (policy=reject) header.from=soleen.com; spf=pass (imf26.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.160.175 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1754531094; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=FY0apzV4/jiYpNtz4zaEBU41SIXIqP4k9Hjv/Z6KQLI=; b=i6XPU2YOwWTpICkUL8wOa7hoS3PcZTFmDn3yCklIUlLvryJZOg1plvAcj2Sxh/YAiI6lC2 MUaAe6xvRCDL+I8tibumm3e342U1rRwk2JWkZyzdeJJTxmiPQIJoBwfJyMgyOW/8MomugD 5jAk1j1arQPSZ7lcToPGS+ogNlf/Epo= Received: by mail-qt1-f175.google.com with SMTP id d75a77b69052e-4b0739c6557so7724701cf.3 for ; Wed, 06 Aug 2025 18:44:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; t=1754531093; x=1755135893; darn=kvack.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=FY0apzV4/jiYpNtz4zaEBU41SIXIqP4k9Hjv/Z6KQLI=; b=hvZ3FnWjSeK8YC8bNUw7XObeCE1RWVp6pT9/Smsd0hJ73MTKRYGboRf53+yB1UEg6R 0yiwjGXWYWCPwByYZX/gzUUw9d8ta6fszN8r0Meh14wi76xdpRISWhHKRHD6Fy89V847 iUSaVkLB/qFyElLBC8yOSUokLQSx47Zpp4xxhpsNttUQ10JbK92OmZ73+mG4iafpyTC8 8kUdf0MHi5OVUfakqPs85qTtAs68ZM5ID4nxsjTR1cZmPMhmEOuMOYUtCGDKssNNk9f4 jWuod0baVwmKo5rkHcsTPLwNX/sfPmm9hBXHlng0TdokM0suts01f7MNwrYmsDxRRhhg 5tPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754531093; x=1755135893; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=FY0apzV4/jiYpNtz4zaEBU41SIXIqP4k9Hjv/Z6KQLI=; b=HSvf89mHekDgvdfx+EdoB6qevs+AQWpDVBWj4u8UXxUQaj/G+UaA0PCXHTQ/RyACVl 1muOFjgKm5iGphAsGSMyyFY2CJeV89Zl3dVCBMLF1bYUHZA9kTh+u8lMWpPGelgznX77 5r833VR8Lu2eXgW9iCxju7ZyNXcmLvIhGA/sIDQ+FInVYzNC1cWqMYMsQvUJGybxqGov WSPCJ6Fy+4ctMVj9Khf9zSYkfqMFebedn4+++Ubmh76KsBCSnOThQZISRAYdLtt+hZY0 PxrRh7zAGDNwV96vJKQamQkMGKu9GeZwYJ7Pilgo9tPe72S5Xa4FhRKsYgTmAZJWrjEL JK0Q== X-Forwarded-Encrypted: i=1; AJvYcCV3pOIaIOzjSWYu+DR6evYrDPZznxkokqAVtyjcIuo3uogiLW6n/024hdV1if/ZjntzdK/W1gHIog==@kvack.org X-Gm-Message-State: AOJu0YzseccD9OKtxsj9bR0nEAUT1RoXewY0aTLVEAukobyB/aEQmj0M LWI4LGBP/KF2cOO1rwTh40OPgV2ibJa4bW/a1mx8ZTq7aXizum+b2ZX26dDo1jVg97Q= X-Gm-Gg: ASbGncvGtqfWERP+ZmwMRp3jcZpV36jjEUhVrM3+kNF4iCXCOYaYl5Qmr9dO3fUCs9D iVsge7pfBVy7ZcImi85tE85tsADbvnIVdF7gQzMMlmnh4zNnD4yJHVnDQ1lA4qCzdZFsU8149L6 PY2gCCIMacM3KgAHhMRhiYSwVxPk99yGpJGZGkNQV3vGxkvBFqlOtpa66ajON1h8qptKs+bIN5y EYdor3kOz+6eRDWNwJRBDclRS9+r/EHrVxN8ZBoJF7q313JIO+2MSdy8gVOyHlVKxEr6gVg6LnD YRojGBiBhUPBKNHRtFvPeTXqRwU2SdprPI3HotRs4v/H/4H+6EfMTRregDHyfjhO+Gq7GT+68r4 K49OcPup35tVzOztb2okWFIiEpMmfPR6DDc4/L0C+4SGFBW5bMFtoxgmctIPJpvq3qN+m0eWSVd avu/SPAy/LjBN2 X-Google-Smtp-Source: AGHT+IFVnZ5D1Am418Avb76/eeCwz3uLxwOs//KfNDCrFp0xraechqxEC3xc41ENAONdARaIHNn8kA== X-Received: by 2002:a05:622a:1494:b0:4ae:cc4b:11bb with SMTP id d75a77b69052e-4b09163a4cbmr65118341cf.57.1754531093076; Wed, 06 Aug 2025 18:44:53 -0700 (PDT) Received: from soleen.c.googlers.com.com (235.247.85.34.bc.googleusercontent.com. [34.85.247.235]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-7077cde5a01sm92969046d6.70.2025.08.06.18.44.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Aug 2025 18:44:52 -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 v3 04/30] kho: allow to drive kho from within kernel Date: Thu, 7 Aug 2025 01:44:10 +0000 Message-ID: <20250807014442.3829950-5-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.50.1.565.gc32cd1483b-goog In-Reply-To: <20250807014442.3829950-1-pasha.tatashin@soleen.com> References: <20250807014442.3829950-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 20CB1140006 X-Stat-Signature: 4fuyzxz6e5xkcjeg36gn5awhjdmjw7b1 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1754531093-733558 X-HE-Meta: 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 iPv3splZ KpOmjgI+9mExgK8Nan8BjHLaU6/tSlFVk/3cFlLi29rymTCJCv501XNxWAhI0TWSZQ6llvbM7RFiRIdn5eVyjwhYHkFLqEvjR0zAzDoLt+wtPVxXdVmYHlQFj4NGlvU6MvEQwjBN9h6e5O1fuaiWseO+B4YlpvwEPZ0cJShOQjTMYJC2eTIM0HQKxYNNDuMUb/rnoOV/HCEfbvJxWlDIAQxTe+CCgA5qX5rEXz1nADfz93YU9Ghkbz0VwNPcs09ADUNtHFpwxZK8lCZN0MnLaJmH/jhyddBRoMVcZrdWcOXDtfgaQiwBiv5k4rNg1w7Kt2h5WMUZ8lhgqRGrKhnJuahkzdJyb9iJNojESTtWQqIPCpGQlZOO2UYzxuM9obGDiPRjcgctreiw8x12VhYeIIrtxUZESAEIVaeIuf5JNcEz4onD0SuG2gFVErQ== 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 | 56 ++++++++++++++++++++++++++++++++-- 2 files changed, 69 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 c2b7e8b86db0..2c22a9f3b278 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 +790,33 @@ 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; +} + +static int __kho_finalize(void) { int err = 0; u64 *preserved_mem_map; @@ -839,6 +865,32 @@ 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; +} + static int kho_out_finalize_get(void *data, u64 *val) { mutex_lock(&kho_out.lock); -- 2.50.1.565.gc32cd1483b-goog