From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.zytor.com (terminus.zytor.com [198.137.202.136]) (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 4114429A5; Thu, 24 Jul 2025 00:25:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.136 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753316714; cv=none; b=YcguRlCkeuE0f6NyI52TJHSarA5FYWFTfZSof715fmFawlNX+AnBMzbvu1mb6zt3g3fdDbtlxBfBkfDxAx4kp6cf1EAsBfCV1PONpcQ0t08Msw7MHbXncGOh84vxnxB92qWygaKg3xfg6aMhuAA/JOyRKHcy7MalvKQUa/nAj3k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753316714; c=relaxed/simple; bh=cLerZr0tZ8QXPDtAFY4uTuC7HkPyf5EiiSgMN0+9LyA=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=Pk0a8QkXfoI7+50p7Fy7orpcd5MNpQJLqvZtEOdlg/XYSFMFcnIimLQmUTinthLSyjSWAoexdDWi/QN8kpFmCjKnvBKWDMtjKIII7E2N4TAvWG8fNi/jqad18NPI9FgXDMMy882hns2E708fb9w32XsGMp2R69SqsAsOvk+/d7I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com; spf=pass smtp.mailfrom=zytor.com; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b=ZWferC0a; arc=none smtp.client-ip=198.137.202.136 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zytor.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="ZWferC0a" Received: from [192.168.7.202] ([71.202.166.45]) (authenticated bits=0) by mail.zytor.com (8.18.1/8.17.1) with ESMTPSA id 56O0OW3m1470900 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Wed, 23 Jul 2025 17:24:32 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 56O0OW3m1470900 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2025072201; t=1753316674; bh=gLOtS/+ev6HyXuX1XCQhk3QZeKPDa68Coh1pDfdCFB8=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=ZWferC0a/rXtsnMJll2BVlI8xLSfnjZ4gRcg5TdiE9oTAbtPNAMBMUZASl0SgH5gv ti0+l634cOAfdsdBOC3tUKq8hv1spIQFkIiOWRuaDsGVsEP8IvP6KAllbb8LKfB8Np Tb86fDvXldKFvBPHZ0fqJJI7QFxXBQnyNEJt4lBrHI70HUBY2jpYbK22jVpoNOIQSK OdievzMnOXLyQw28idUs2fH6j+Wm3RVP3KW0EVzfY/h9Qnp7HXoqXks7pJOyUuTS+3 387tCKdpNVYFAS0bwZTU2vyq+jVU+JaQ/P6ooZqzrYlrgjaCvemJzKorTx9XAMVQTm faJBOHp5EgPIA== Message-ID: Date: Wed, 23 Jul 2025 17:24:31 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] x86: Clear feature bits disabled at compile-time From: Xin Li To: Maciej Wieczor-Retman , Greg KH Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Kirill A. Shutemov" , Alexander Potapenko , "Peter Zijlstra (Intel)" , Xin Li , Sai Praneeth , Jethro Beekman , Jarkko Sakkinen , Sean Christopherson , Tony Luck , "Mike Rapoport (IBM)" , Kees Cook , Rick Edgecombe , Yu-cheng Yu , stable@vger.kernel.org, Borislav Petkov , linux-kernel@vger.kernel.org References: <20250723092250.3411923-1-maciej.wieczor-retman@intel.com> <2025072310-eldest-paddle-99b3@gregkh> <5pzffj2kde67oqgwpvw4j3lxd3fstuhgnosmhiyf5wcdr3je6i@juy3hfn4fiw7> <2025072347-legible-running-efbb@gregkh> <0e52c9c5-006e-406b-8ae0-7f5c5273cba2@zytor.com> Content-Language: en-US Autocrypt: addr=xin@zytor.com; keydata= xsDNBGUPz1cBDACS/9yOJGojBFPxFt0OfTWuMl0uSgpwk37uRrFPTTLw4BaxhlFL0bjs6q+0 2OfG34R+a0ZCuj5c9vggUMoOLdDyA7yPVAJU0OX6lqpg6z/kyQg3t4jvajG6aCgwSDx5Kzg5 Rj3AXl8k2wb0jdqRB4RvaOPFiHNGgXCs5Pkux/qr0laeFIpzMKMootGa4kfURgPhRzUaM1vy bsMsL8vpJtGUmitrSqe5dVNBH00whLtPFM7IbzKURPUOkRRiusFAsw0a1ztCgoFczq6VfAVu raTye0L/VXwZd+aGi401V2tLsAHxxckRi9p3mc0jExPc60joK+aZPy6amwSCy5kAJ/AboYtY VmKIGKx1yx8POy6m+1lZ8C0q9b8eJ8kWPAR78PgT37FQWKYS1uAroG2wLdK7FiIEpPhCD+zH wlslo2ETbdKjrLIPNehQCOWrT32k8vFNEMLP5G/mmjfNj5sEf3IOKgMTMVl9AFjsINLHcxEQ 6T8nGbX/n3msP6A36FDfdSEAEQEAAc0WWGluIExpIDx4aW5Aenl0b3IuY29tPsLBDQQTAQgA NxYhBIUq/WFSDTiOvUIqv2u9DlcdrjdRBQJlD89XBQkFo5qAAhsDBAsJCAcFFQgJCgsFFgID AQAACgkQa70OVx2uN1HUpgv/cM2fsFCQodLArMTX5nt9yqAWgA5t1srri6EgS8W3F+3Kitge tYTBKu6j5BXuXaX3vyfCm+zajDJN77JHuYnpcKKr13VcZi1Swv6Jx1u0II8DOmoDYLb1Q2ZW v83W55fOWJ2g72x/UjVJBQ0sVjAngazU3ckc0TeNQlkcpSVGa/qBIHLfZraWtdrNAQT4A1fa sWGuJrChBFhtKbYXbUCu9AoYmmbQnsx2EWoJy3h7OjtfFapJbPZql+no5AJ3Mk9eE5oWyLH+ QWqtOeJM7kKvn/dBudokFSNhDUw06e7EoVPSJyUIMbYtUO7g2+Atu44G/EPP0yV0J4lRO6EA wYRXff7+I1jIWEHpj5EFVYO6SmBg7zF2illHEW31JAPtdDLDHYcZDfS41caEKOQIPsdzQkaQ oW2hchcjcMPAfyhhRzUpVHLPxLCetP8vrVhTvnaZUo0xaVYb3+wjP+D5j/3+hwblu2agPsaE vgVbZ8Fx3TUxUPCAdr/p73DGg57oHjgezsDNBGUPz1gBDAD4Mg7hMFRQqlzotcNSxatlAQNL MadLfUTFz8wUUa21LPLrHBkUwm8RujehJrzcVbPYwPXIO0uyL/F///CogMNx7Iwo6by43KOy g89wVFhyy237EY76j1lVfLzcMYmjBoTH95fJC/lVb5Whxil6KjSN/R/y3jfG1dPXfwAuZ/4N cMoOslWkfZKJeEut5aZTRepKKF54T5r49H9F7OFLyxrC/uI9UDttWqMxcWyCkHh0v1Di8176 jjYRNTrGEfYfGxSp+3jYL3PoNceIMkqM9haXjjGl0W1B4BidK1LVYBNov0rTEzyr0a1riUrp Qk+6z/LHxCM9lFFXnqH7KWeToTOPQebD2B/Ah5CZlft41i8L6LOF/LCuDBuYlu/fI2nuCc8d m4wwtkou1Y/kIwbEsE/6RQwRXUZhzO6llfoN96Fczr/RwvPIK5SVMixqWq4QGFAyK0m/1ap4 bhIRrdCLVQcgU4glo17vqfEaRcTW5SgX+pGs4KIPPBE5J/ABD6pBnUUAEQEAAcLA/AQYAQgA JhYhBIUq/WFSDTiOvUIqv2u9DlcdrjdRBQJlD89ZBQkFo5qAAhsMAAoJEGu9DlcdrjdR4C0L /RcjolEjoZW8VsyxWtXazQPnaRvzZ4vhmGOsCPr2BPtMlSwDzTlri8BBG1/3t/DNK4JLuwEj OAIE3fkkm+UG4Kjud6aNeraDI52DRVCSx6xff3bjmJsJJMb12mWglN6LjdF6K+PE+OTJUh2F dOhslN5C2kgl0dvUuevwMgQF3IljLmi/6APKYJHjkJpu1E6luZec/lRbetHuNFtbh3xgFIJx 2RpgVDP4xB3f8r0I+y6ua+p7fgOjDLyoFjubRGed0Be45JJQEn7A3CSb6Xu7NYobnxfkwAGZ Q81a2XtvNS7Aj6NWVoOQB5KbM4yosO5+Me1V1SkX2jlnn26JPEvbV3KRFcwV5RnDxm4OQTSk PYbAkjBbm+tuJ/Sm+5Yp5T/BnKz21FoCS8uvTiziHj2H7Cuekn6F8EYhegONm+RVg3vikOpn gao85i4HwQTK9/D1wgJIQkdwWXVMZ6q/OALaBp82vQ2U9sjTyFXgDjglgh00VRAHP7u1Rcu4 l75w1xInsg== In-Reply-To: <0e52c9c5-006e-406b-8ae0-7f5c5273cba2@zytor.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/23/2025 8:52 AM, Xin Li wrote: > We need to investigate the root cause of this bug; and this seems like a > regression caused by my patch set that automatically generates CPU > feature masks. My bad, it's not caused by my patch set. The bug is there for a long time before the patch set was merged. And it seems we need a different patch for older Linux kernels. Thanks! Xin