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 444B786323; Thu, 19 Jun 2025 05:06:57 +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=1750309620; cv=none; b=A9DxtNkpEHv7Y0AZymF0bDTOkEZxuY7fVoY+v6LRckyA8Jq0RdS611oHSaYk+/WNwvQHFnOSOde9U3p0/RAaqSpqYWIkRH07OwZVGLm9zLi67cN6pNZzdms0cbBZ2PZ4AeRGK9ktlnOmM/z652zptcB5xUGN/bl+AmY2mTGHJW4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750309620; c=relaxed/simple; bh=dJB1u2JWXJozGiv0+Ln9kYquCHssXXPauDnjpd/ISRU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=j4wclwFn3KNtRSo0FDM91V39J7faqjGHRNDuN9Yt7vvLyZ62OS+xcZ8wmIHL4WnhZ8KJg1xOnOvELEr7kA2p5ax13Hs4BHhacGX/xeCOVqi5ZN9/bMKdbT3J6jHHZ8JdyGaK0KwNVJ8tMVC6BEZeKhLOrNVzwtAnzU7locVdk0Y= 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=KTLPxhBb; 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="KTLPxhBb" 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 55J56LL21857640 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Wed, 18 Jun 2025 22:06:22 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 55J56LL21857640 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2025052101; t=1750309586; bh=HzspTY7etithet9qj7wLSiiMq1a1X3plMfTADysUVaQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=KTLPxhBbxYbGq8LPVWajgRuSruQppRTI7wbW/Xq6jbZPE2Z+rrHjlMTtILupnw+qw gC8jE0TCS7W/4gd7GSjfmrtRkqhQtXO6CeggDsiqZ6r0A/8JkQSaOgughEc5RYOuu8 1LcQqYRiFjveyE2gDu/6XhJ562WxoHMQOn9y9XK6gQb9sm2MumVM+/6pxpi8eDc90Q 6oWze0rZxkApGuTTy0A/wWjdpijz3keTVCUDUWfdQ/D3MjhapGXeMVz07WvBE0KUej 0+0pjOwEp+72Zg3pILRPKqbf5C4ONvD3m5KNJ/zFxqVYK6PRyW7FPb4MHoA5mDJI3C CIYNt2zsyYeQw== Message-ID: <70b7f6ba-1f13-4af0-b27e-064d6aaa5334@zytor.com> Date: Wed, 18 Jun 2025 22:06:20 -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 v7 03/10] x86/cpufeatures: Add the CPUID feature bit for NMI-source reporting To: Sohil Mehta , x86@kernel.org, linux-kernel@vger.kernel.org Cc: "H . Peter Anvin" , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Peter Zijlstra , Sean Christopherson , Adrian Hunter , Kan Liang , Tony Luck , Zhang Rui , Steven Rostedt , Andrew Cooper , "Kirill A . Shutemov" , Jacob Pan , Andi Kleen , Kai Huang , Sandipan Das , linux-perf-users@vger.kernel.org, linux-edac@vger.kernel.org, kvm@vger.kernel.org, linux-pm@vger.kernel.org, linux-trace-kernel@vger.kernel.org References: <20250612214849.3950094-1-sohil.mehta@intel.com> <20250612214849.3950094-4-sohil.mehta@intel.com> Content-Language: en-US From: Xin Li 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: <20250612214849.3950094-4-sohil.mehta@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/12/2025 2:48 PM, Sohil Mehta wrote: > NMI-source reporting is introduced to report the sources of NMIs with > FRED event delivery based on vectors in NMI interrupt messages or the > local APIC. This enables the kernel to avoid the latency incurred by > going over the entire NMI handler list and reduces ambiguity about the > source of an NMI. > > Enumerate NMI-source reporting in cpufeatures.h. Also, since NMI-source > reporting uses the FRED event dispatch framework, make it dependent on > FRED in the CPUID dependency table. This ensures that NMI-source > reporting gets disabled when FRED is disabled. > > NMI-source reporting is intended as a kernel feature and does not need > userspace enumeration or configuration. There is no need to expose it to > userspace through /proc/cpuinfo. > > Originally-by: Jacob Pan > Signed-off-by: Sohil Mehta Reviewed-by: Xin Li (Intel)