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 EF2CD1DDDB; Sat, 22 Jun 2024 17:17:03 +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=1719076625; cv=none; b=GJ1HpE6ENHVZrvKppE7v4LoknmAuzzaxaLxQ99QB+98pQKnrgA05E5iUI+nV09xA5ak6kHrDIHTE4DTGxRR040DahjCANU3SOtyl5fpQvb3XMseKHWyCUnz/knNumKzS1rl48FvcYtgKj+6YtC50COdxqnk62YxnV/VveHs8/vU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719076625; c=relaxed/simple; bh=xP5TP7JzEvS4korFT0KEJ+odHfxfenKgSNo8TAtLZL4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=r8Jm6JE3LMvLOHHQYKRoWOkkLBm28Wmyb2wQxI88waFCE704Lv9jzv/ugrZC2j41vNq2hkeQ/SNdZvdgNdz/6cUaBJ69/Ij2NlJrQ8TTEe4Kx8z8HZROfj/6IFOl7zmmPubY6JVsJpi/8DMuLfT6mvhMF6HrdVaPfq2MRrnKOPw= ARC-Authentication-Results:i=1; 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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=RsDtmFlmABmwcjCOM+url5ljwnkpe4hpzUHgNkFTDNFUF6w9XvAdfwydjGx98FM49 JjVehblaLor3bv4MlSYRiC1j9P/0kkGngwLft+2oVymO6p0TZdx1eOPmSJYkO9F2JT zmI0Erhr2E64RQB1csKPTgVjDa/KyOv+J0VGrBtFIKDFKH1xJzJT64K4LGy/wyD1ZP x3FCIKBxBZvsbz+P9epk1xNhXTvYmJLwEG/F57OmQQGih6lkugvdReSnmo9slscfeB Sj9Qa/GzM1NdzycXuOOjh7bMn4jOyTLrWezyUsLAlB/AWxnpaAIZdka1IAmvfhkS5F je2bu6Qjpz0kw== Message-ID: Date: Sat, 22 Jun 2024 10:16:32 -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 1/3] x86/cpufeatures: Add {required,disabled} feature configs To: Borislav Petkov Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, will@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, acme@kernel.org, namhyung@kernel.org References: <20240616085743.1100704-1-xin@zytor.com> <20240616085743.1100704-2-xin@zytor.com> <20240621173245.GKZnW5PVnf4ota5pL4@fat_crate.local> Content-Language: en-US From: Xin Li Autocrypt: addr=xin@zytor.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/21/2024 10:32 AM, Borislav Petkov wrote: > On Sun, Jun 16, 2024 at 01:57:41AM -0700, Xin Li (Intel) wrote: >> diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures >> new file mode 100644 >> index 000000000000..5ed24e45df87 >> --- /dev/null >> +++ b/arch/x86/Kconfig.cpufeatures >> @@ -0,0 +1,197 @@ >> +# SPDX-License-Identifier: GPL-2.0 >> +# >> +# x86 feature bits (see arch/x86/include/asm/cpufeatures.h) that are >> +# either REQUIRED to be enabled, or DISABLED (always ignored) for this >> +# particular compile-time configuration. The tests for these features >> +# are turned into compile-time constants via the generated >> +# . >> +# >> +# The naming of these variables *must* match asm/cpufeatures.h, e.g., >> +# X86_FEATURE_ALWAYS <==> X86_REQUIRED_FEATURE_ALWAYS >> +# X86_FEATURE_FRED <==> X86_DISABLED_FEATURE_FRED >> +# >> +# And these REQUIRED and DISABLED config options are manipulated in an >> +# AWK script as the following example: >> +# >> +# +----------------------+ >> +# | X86_FRED = y ? | >> +# +----------------------+ >> +# / \ >> +# Y / \ N >> +# +-------------------------------------+ +-------------------------------+ >> +# | X86_DISABLED_FEATURE_FRED undefined | | X86_DISABLED_FEATURE_FRED = y | >> +# +-------------------------------------+ +-------------------------------+ >> +# | >> +# | >> +# +-------------------------------------------+ | >> +# | X86_FEATURE_FRED: feature word 12, bit 17 | ---->| >> +# +-------------------------------------------+ | >> +# | >> +# | >> +# +-------------------------------+ >> +# | set bit 17 of DISABLED_MASK12 | >> +# +-------------------------------+ >> +# > > Look ma, a picture. :-) > > But yeah, this is better. > We are better in intercepting pictures :) Thanks! Xin