From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2840735CB6F; Fri, 24 Jul 2026 19:16:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784920614; cv=none; b=Kn91POu+kKLQlmwixeGgoeggatcW1LcTpZHOWTOEI9u31xLJ1QcMr7DUR+Yc7oBFp44kcLx6xKXhvIcEtGInzi+R4bCa7Yzz1InmMA0qiVwQ+1PF1BWs2s2GHanVNwHxEDjckjy3yjtm6dRrxsx9x49zc1wxUDC7Q8Qlp96OBaI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784920614; c=relaxed/simple; bh=cy2wE3R0dHWYq+kWDx7CbqN+CaDJuTUZnfVbPk3FCjQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=DeZzvSg/5ZaGr+ilgdf9d2Livk64IEBLuJ9dnyiT68/lMsWe8oNlRFXRprvk73dObLS1gTPThyFA+3K9n+xuYCtD/HbVwRRWt6TimIHNZV40HxKh+1NznAcNT+f2i0a6qRvpr2EUFGwVBOyZ3PUNgnaUaVRLbohZF1EGu0d/8Ts= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oTs+YdZA; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oTs+YdZA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 956851F000E9; Fri, 24 Jul 2026 19:16:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784920612; bh=6NK3QyVREn3L8bxkVQS1QuG6Ozoq3GOKYWn3bLL1DHc=; h=From:To:Cc:Subject:Date; b=oTs+YdZABP9PkhbqnFcarpRXsIeVIbBRbq2xNfMFaD4SQ6tXAqv8WVeN/wzZwNliJ XXdoS8USY4js4ot9hadUgiOpWGOK1bCjNPGkebgzegcnO+uHxEfBQXmc5aLxT734Pj E2f3aIgNZ2WQx4rb70j7rQbjcrmjq79vulmuLqWf0kImpTAx1M5jBQvqVOj5L1H1W8 km2vc1vib7Qo70AGnp4Z4fUXsNcDRdxdsHB7k8hpYxma3PVZtGjZEmrNp9iUqM6bC3 PxrbKZUOqqzU91Gs3Z2KnLFRPZM3Qe5s624q+BnB02kPGK6GJLwdFQwAW8lkSG9QFn 2xMKG5T7mvt+Q== From: Tejun Heo To: David Vernet , Andrea Righi , Changwoo Min Cc: sched-ext@lists.linux.dev, Emil Tsalapatis , linux-kernel@vger.kernel.org Subject: [PATCHSET v2 sched_ext/for-7.3] sched_ext: Follow-up fixes and missing cap enforcement Date: Fri, 24 Jul 2026 09:16:46 -1000 Message-ID: <20260724191651.1040227-1-tj@kernel.org> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hello, Follow-up fixes and enforcement holes plugged from the recent sub-scheduler work. The first patch fixes the tools' restart loop clobbering an exit that was requested while a restart was pending. The rest tighten how cid-addressed operations from sub-schedulers are handled when the caller lacks the necessary caps. Reenq to another sched's local DSQs is now denied and counted, and a new event counts the already-denied kicks. These checks are lockless - transient false positives from cap rotation are harmless and false negatives can't happen by visibility. cpuperf control moves behind a new SCX_CAP_PERF which only the root holds by default, and scx_bpf_cidperf_set() reports the result synchronously as its check is authoritative under the target's rq lock. v2: - Kernel-doc comment moved to scx_bpf_cpuperf_set() instead of being left attached to the factored-out helper (0004, reported by sashiko). - The versioned scx_bpf_cidperf_set___v2() interface and the tools compat wrapper are dropped. The cid-form interface is still under initial development, so the signature is changed in place to return s32 (0005). v1: https://lore.kernel.org/r/20260724182125.985061-1-tj@kernel.org 0001-tools-sched_ext-Don-t-restart-over-a-pending-exit-re.patch 0002-sched_ext-Gate-local-DSQ-reenq-on-baseline-cid-acces.patch 0003-sched_ext-Count-kicks-denied-for-lacking-baseline-ci.patch 0004-sched_ext-Factor-out-scx_cpuperf_set.patch 0005-sched_ext-Gate-scx_bpf_cidperf_set-behind-a-new-SCX_.patch Based on sched_ext/for-7.3 (c509d8107026). The patches are also available in the following git branch: git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git scx-sub-cap-gates-v2 diffstat follows. Thanks. kernel/sched/ext/ext.c | 139 +++++++++++++++++++++---------- kernel/sched/ext/internal.h | 31 ++++++- tools/sched_ext/include/scx/common.bpf.h | 2 +- tools/sched_ext/scx_central.c | 2 +- tools/sched_ext/scx_cpu0.c | 2 +- tools/sched_ext/scx_flatcg.c | 2 +- tools/sched_ext/scx_pair.c | 2 +- tools/sched_ext/scx_qmap.bpf.c | 17 ++-- tools/sched_ext/scx_qmap.c | 2 +- tools/sched_ext/scx_sdt.c | 2 +- tools/sched_ext/scx_simple.c | 2 +- tools/sched_ext/scx_userland.c | 11 +-- 12 files changed, 149 insertions(+), 65 deletions(-) -- tejun