From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f179.google.com (mail-pg1-f179.google.com [209.85.215.179]) (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 997DBC8CE for ; Wed, 11 Jun 2025 05:31:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749619866; cv=none; b=QC6AYawLAwJDUeQ4dXXK61VdJMTkdybGFZeTuzBj156gExWCPis6j2WDENMhojtCf2kRIgEjGergYOLciJ++mfJfiHseVU7lO6vep7AvcoRhaLKhqau8lMvbJmqXqvb9/GL2Op9lEFqa8rt6SEFtFk5z/yQBGjQ5I07U19QKvn4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749619866; c=relaxed/simple; bh=dRH46/1hNLBiXkjN9kgJL81svW0Uw8xj53iNR/ajQlQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=e5IDmAFyTQ5n2gyp0kEvapjIqrbnuKt1EvgAn1MLo9mjxOsxdEZwiw5BLWEKPjg64Ztm0NySYBU7xMx5hSro7I2rmfaFW5sC1Rry+s1ylwF1EMICPt46wlizCqn3viqoOC9Xn1mdoVZmAjuSgPcUoFcbEb9wZgesC204TuPb0oQ= 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=nF3w2IIF; arc=none smtp.client-ip=209.85.215.179 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="nF3w2IIF" Received: by mail-pg1-f179.google.com with SMTP id 41be03b00d2f7-b2c49373c15so4361885a12.3 for ; Tue, 10 Jun 2025 22:31:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749619864; x=1750224664; darn=vger.kernel.org; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:from:to:cc:subject :date:message-id:reply-to; bh=dfiU1NAwld4VCnc2vxBMtZOueJCRPQQAjvibob+nkrU=; b=nF3w2IIFGLHzepN2ioFXce9eI99VbEDRrKoJiipUlLdhQikqvUKav/WJcAgLyd84YK JVBeTwxeBn0lfREWYCmxhOCV52WisuaDqm77uVcSqJmborrDoNRiUEn61KdHbdv/iUed 26yLMY4rhCHwr9BH3Zk282pg4ieRJ7BEDNQpMN9LQpkqVvrRYc++LZ8wQ04DA4VuwMXP a5R+FvLwe0Bo9zrzsOrmRloNBYQHHSfNaDVBnnz8+eofR3NUyODGtSBe/jBDp/14Lj5+ +VN5uF+35/utITpoqRrtaRcOVDngWt1OS9ByGl7t7e9uI1IV1V0uhrsR3xQE36ZoQXs2 U9DA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749619864; x=1750224664; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=dfiU1NAwld4VCnc2vxBMtZOueJCRPQQAjvibob+nkrU=; b=ItdbIkWzF6SqzVMp9vuUMIpTqkCN/GNruqN+yiGPIkrykxRQYO4Wq8FYxvc8r7vsRB i8oLxMrIph9jEtiqeBlUTLDp8nnKOcOQpqiUy4dRA0ecQvZkSrtOsDTDHxL9Kgvt+8io 5TtEENwYUpvF/kNXNfl2RdsuSGROrpvt3rgnFU6qTqb5Ih9qIL4yuG62TGIwsibNUfVU g4hLOg+YIKW0IOwBTHtFS64FU9tkPsHAxMm+K1xaFe8gAOM4FQG3dnv3qpFcX5CFNc9x R+cl8FcRhMPxYlC/yEFoUsljcGWnrQraOkc7TSVbgNI/fMhO1beViSEMd5YEZLK77ao/ m51Q== X-Gm-Message-State: AOJu0YzC0xhTwsItvtFZ/uASLTeBowIkfRy9gMJCSNZoNRxYDW93xdAq QF6EufYy/4miKchr1mnNlzJpextb60xEBlR2JYPgWYpEXCf0DQggw2yU X-Gm-Gg: ASbGnct6kfMfyo8JIgucrk8HinwYYwEZA4FcQ4JTQkLFjA36JX035JMUW0ZDWsCRH2w hkV3wKOeZNnibylun/7Zrrusg6aOIoOxumEUUzQytSrfSmhwRBUqZGydc/k4Wbk8XXAlw5JpMEh aWkL9lv8l+7Zz5KxSYOHGlklDKgMbejyJopIKblbc6+0ReLRzAnMJx3pZdfedbhBeOPHTs6Xnn4 si/OoZRnLDmcN0360463hC7bcjTde9OlsuQqmh36hbc2cwCAJBVjQMo7WptJWw2y0jxiM8iOrwX Q5UaSwlarvgwB6KD0wZEq/+J/7ndK5AtCRkJ/hSvvRSy+GVIYAIYsK/DrA== X-Google-Smtp-Source: AGHT+IGyjmLpLw2XTmspnJXfyXbXxrlMC3v2K/x9mBioNB1sLVLJ3HVy4DjW+Jq195jSBOJ7ARgbwQ== X-Received: by 2002:a17:90a:ec86:b0:312:25dd:1c86 with SMTP id 98e67ed59e1d1-313b1fdabfbmr2044053a91.18.1749619863698; Tue, 10 Jun 2025 22:31:03 -0700 (PDT) Received: from [192.168.0.56] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-313b20078dfsm492088a91.15.2025.06.10.22.31.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Jun 2025 22:31:03 -0700 (PDT) Message-ID: <5381e905bb6f782493866a6cf8aa859f2b1e3170.camel@gmail.com> Subject: Re: [PATCH bpf-next] selftests/bpf: more precise cpu_mitigations state detection From: Eduard Zingerman To: Yafang Shao Cc: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, kernel-team@fb.com, yonghong.song@linux.dev, mykyta.yatsenko5@gmail.com Date: Tue, 10 Jun 2025 22:31:00 -0700 In-Reply-To: References: <20250610215221.846484-1-eddyz87@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-06-11 at 10:54 +0800, Yafang Shao wrote: [...] > > + config =3D gzopen("/proc/config.gz", "rb"); >=20 > The /proc/config.gz file is not enabled in certain kernel releases. > Should we also check "/boot/config-$(uname -r)" as an alternative? > Oh, my... It's a zoo, on Fedora the config location is: /usr/lib/modules/$(uname -r)/config Tbh, I was fixing a problem with tests execution in a specific environment. Adding a list of common locations for config is an option. Another option I tried but discarded is [1], where kernel/cpu.c:cpu_mitigations variable is read directly by a BPF program. But this is probably too heavy-handed. [1] https://github.com/eddyz87/bpf/tree/better-unpriv-disabled-detector [...]