From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f171.google.com (mail-pg1-f171.google.com [209.85.215.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDD5243D4E2 for ; Wed, 13 May 2026 14:33:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778682842; cv=none; b=pnPHOxArHofz9T2mqoR4ZaGttSO2UFLv0yZgNHJpQn+68QIlV0Oo8ZcI1FEH8gSzxwBICTRZGdw1D4D4lXKh30JjRlUNR2JoBcISmd+cpB7e0T+rCXbDrDILQCD9rsh22swHJS+3H6nPRH98ckJuMF+3Ru9eRnPE9/eR923oQYM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778682842; c=relaxed/simple; bh=dfKQebfvYV01n9BDLdP2f+gl2OpzJB0nHQBKtvWOooE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=p8y2nBEUH0B+MSxzPEZer3U44x+fdQf7g10pUaYj/oMPVCvpnzPxvXIUENtYIPOj2g68pA4JWPRRz1LQtJ1tCp5vwIahfYpsJo/8xrlTeKvvw+IJl/dGCGx9zTpQVdyVGWQBbc7Q+dmYfjoxtuEDVB46dkxsZpc7J9syHZV4/QE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=IR13dfhu; arc=none smtp.client-ip=209.85.215.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IR13dfhu" Received: by mail-pg1-f171.google.com with SMTP id 41be03b00d2f7-c80167f5716so3030134a12.2 for ; Wed, 13 May 2026 07:33:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778682835; x=1779287635; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=9NCRCgC4R1mbMwJy1J8zzCoALIh6Y1cOjVOSf5s36zI=; b=IR13dfhukJ3UXr+Doq4bXdKWcQZNXXz4ZbLmR2uySM1i0bN9hU93y2jLKtWg8wanHh AP7aFeFEs/TZPdJnsUk7nx9x1+8Yl/xn4ZujU1Xtv8H6XXle0DUMNTloAnPuhpF0caYh nv1DxqEYu3K2iayIZYiRIDufnTtqqg48BqXOoNbEgQui1qgiMHT5nlz2JSnKEfTCwo+h u9PJr6gtdtUoitaFl95guaGz0g6qVrMPLL3+L32MFh/p2tFwUHkt+cWCWnqMXIa6xXBd opU0P1pr3EaEZpOBpKGUQcXBYdY9jJUCezNt1gaVqNtamcoHWLcpUMn/NVBxf55ipG/y 5epA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778682835; x=1779287635; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=9NCRCgC4R1mbMwJy1J8zzCoALIh6Y1cOjVOSf5s36zI=; b=OXH7LbICDLpwklkXLU+j5/MbsuAlZm4l112wc9DxAzKes4HAyTH23YENY2kAFfmzb+ 4knFaxeGWi2uVQ9hyHVWZ3VR/r30QJtwlY/YeH9w7wvQXAagDniVe+x0thLK196/r87n orfZHwLyrW3dXPAqhAfC0XJCOOgl7NK5+xuffDmYDCFVdzTSel831ySn8U6cldchcZNg jIcJEx2Nibh9ySBv9Kua+RKB1/qb3P6brYnzStA72VG5ERlGSjoRnDCJh8JhnbtML09G 4Ml5rOD2gPFgIMwlQqpyvLl6FLpxaT18ilBTfOLuOthgDYrgBCO1lkv/9EUP7B94+WaJ bE/Q== X-Gm-Message-State: AOJu0YwNsLVosciyL2p/Q6aiAmPqErNbwuhdv8m6HMDXwA4bXSylnbKe dL9V+qdfxKU40mL8kvNGzwJrXEX8pDILjwFOw/0cJB97F6mZ4MtDkQ1t X-Gm-Gg: Acq92OHQ/mHXnnV2aFN/AmnkyM5f88eB+EP5Jtr1zL+B0CTRYxHgaJNyux8IUAUTjld tEoYiEFDMXizPnIUU8tsg8TSnRXM2WD5s21ik97/9ysn8ANp7lGAnAm7FL2vzL0Hb2N9l/RHotW YllyBQqhvMXAnDQSdIT01dtRP+NQQ3lWcmXBtyiteSiJ12552CNiS1TpUDOKTXInf8h0nFMbepe NDEo79jXMKPhKKX3eVdLoDuKaepnMXXZdvXsauJoVyjcs5AFuN9Yc+K23tOBlSn9Ocutq7KfY+o 2Rtxh6M9EJGcKxajRIpy2OYIdnWS2YWAbWHGB4FHcq1S6WNCyzYhKj/qZzBB4q50t4ahWuDcbc9 oYUzIFQ4ZgJ7etvzWbGMWNqRNAud+yT2+VeNbLCwA3a/rRLoiw1oT1PkePW4et6QibTh8Dp6aer fT0wv6+wZICBfzr08p3ONDnAG5CdIdYku74IPSfzENCuSXgDCHbBmIQY+5NRRoYYuNeJ3TyJd/O N6wpZ9b1KCb1vE= X-Received: by 2002:a05:6a21:3299:b0:398:79a8:5bf4 with SMTP id adf61e73a8af0-3af8197717amr4167777637.37.1778682835023; Wed, 13 May 2026 07:33:55 -0700 (PDT) Received: from localhost.localdomain ([240e:46c:2200:3c3:e555:e58a:71d1:ef1d]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c826771018bsm15006418a12.17.2026.05.13.07.33.50 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 13 May 2026 07:33:54 -0700 (PDT) From: Yafang Shao To: jpoimboe@kernel.org, jikos@kernel.org, mbenes@suse.cz, pmladek@suse.com, joe.lawrence@redhat.com, song@kernel.org Cc: live-patching@vger.kernel.org, Yafang Shao Subject: [RFC PATCH 0/6] livepatch: Introduce replace set support Date: Wed, 13 May 2026 22:33:15 +0800 Message-ID: <20260513143321.26185-1-laoar.shao@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: live-patching@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We previously proposed a BPF+livepatch method to enable rapid experimentation with new kernel features without interrupting production workloads: https://lore.kernel.org/live-patching/20260402092607.96430-1-laoar.shao@gmail.com/ In the resulting discussion, Song and Petr suggested adding a "replace set" to support scenarios where specific livepatches can be selectively replaced or skipped. - Patch #1: Adds replace set support for livepatch functions. - Patch #2~#5: Derived from Petr's original patchset: https://lore.kernel.org/all/20250115082431.5550-3-pmladek@suse.com/ All the selftests are not included in this RFC. Note: Due to a significant refactor in Patch #5, I have omitted Petr's Signed-off-by for that specific patch. Please let me know if this is not the preferred approach. - Patch #6: Adds replace set support for the shadow variable API. Petr Mladek (3): livepatch: Add callbacks for introducing and removing states livepatch: Allow to handle lifetime of shadow variables using the livepatch state livepatch: Remove "data" from struct klp_state Yafang Shao (3): livepatch: Support scoped atomic replace using replace set livepatch: Remove obsolete per-object callbacks livepatch: Support replace_set in shadow variable API .../livepatch/cumulative-patches.rst | 17 +- Documentation/livepatch/livepatch.rst | 23 ++- include/linux/livepatch.h | 30 ++-- include/linux/livepatch_external.h | 62 ++++--- kernel/livepatch/core.c | 51 ++---- kernel/livepatch/core.h | 33 ---- kernel/livepatch/shadow.c | 70 +++++--- kernel/livepatch/state.c | 165 +++++++++++++++++- kernel/livepatch/state.h | 8 + kernel/livepatch/transition.c | 29 +-- scripts/livepatch/init.c | 9 +- scripts/livepatch/klp-build | 14 +- tools/include/linux/livepatch_external.h | 62 ++++--- tools/objtool/klp-diff.c | 16 +- 14 files changed, 373 insertions(+), 216 deletions(-) -- 2.47.3