From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BB8CCF0450 for ; Wed, 9 Oct 2024 11:03:40 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8D64A6B008A; Wed, 9 Oct 2024 07:03:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 885D76B00B3; Wed, 9 Oct 2024 07:03:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 74E476B00D1; Wed, 9 Oct 2024 07:03:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 56BB26B008A for ; Wed, 9 Oct 2024 07:03:39 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 0C1C11412BA for ; Wed, 9 Oct 2024 11:03:37 +0000 (UTC) X-FDA: 82653778158.27.CE17B0C Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf11.hostedemail.com (Postfix) with ESMTP id 5375240021 for ; Wed, 9 Oct 2024 11:03:37 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=DLepzEsh; spf=pass (imf11.hostedemail.com: domain of broonie@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=broonie@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1728471680; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=f/EoNW04y2Nr6yAWUDCYj/76s4oDbPK3TY0FW8YOVV4=; b=1lLYXFgw7UNq/ugweSRmbG6AkA2krdpHffotB/yEA5JJnrBykEv+2aZK0eg4TeM0UcngIe 5/Tdt3w/vGHA9lZDqiVUfK45y4M16KDBlCZWI01O+TlKU6dNrrz+1p2s8/oOjtNONeQswJ FEdsuMxS6laWGYmD2soRyAU9til26hc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1728471680; a=rsa-sha256; cv=none; b=5JdlgMUhXFtV6pcNTn57gE+3p/gRkAg5+BenaPa7PNOA57Zp2eYAcbAO+YZo3qQDIQc1VF HWpyIPxqSyqj4DBCq2XdX0unrbyLmGBSebij8F8MX+n09HYmWWVJip9Rqh+Ly+oZ1FdUMZ 1RCU3dcB+PfiUdvbAEA6j/9VY1KyREI= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=DLepzEsh; spf=pass (imf11.hostedemail.com: domain of broonie@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=broonie@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id B9EA7A43CDF; Wed, 9 Oct 2024 11:03:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F023C4CEC5; Wed, 9 Oct 2024 11:03:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728471816; bh=f/EoNW04y2Nr6yAWUDCYj/76s4oDbPK3TY0FW8YOVV4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DLepzEshP/4mXQsl2XJpjT73NbBGz9G2agwEEd6tQYz9lO+eqYxMzaMcj24H4GW81 Le1KkXnjJBC8MW7FflTwf5k8u62yR275mQzbLM2Xnkksng7BBXCCu3I2IsilKKuh9C tn5I9gMoOPl9IR/07Z7LrDEOfMozP8crg0Ejm1/cMpecXWaC7fqbOpYoml4pkqT6KZ 8ErbCjP7yR0hITlFP8nBM9WRgd/ZKkYKCpiRE0HjmkZfh/VszZtHEOhp3fV+YeRcul Wbp42jCJn48Au8WODEcR3T6WeTkaJD6W4x+KhVfOQYXHADlrjbnU7K+GGkOQQF13Wm yEtogMwRguJXA== Date: Wed, 9 Oct 2024 12:03:32 +0100 From: Mark Brown To: Deepak Gupta Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Arnd Bergmann , Christian Brauner , Peter Zijlstra , Oleg Nesterov , Eric Biederman , Kees Cook , Jonathan Corbet , Shuah Khan , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, rick.p.edgecombe@intel.com Subject: Re: [PATCH v6 18/33] prctl: arch-agnostic prctl for indirect branch tracking Message-ID: References: <20241008-v5_user_cfi_series-v6-0-60d9fe073f37@rivosinc.com> <20241008-v5_user_cfi_series-v6-18-60d9fe073f37@rivosinc.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="FXfO/TwhQ+C7Uak4" Content-Disposition: inline In-Reply-To: <20241008-v5_user_cfi_series-v6-18-60d9fe073f37@rivosinc.com> X-Cookie: Editing is a rewording activity. X-Stat-Signature: w3g16fkfefer4jbag1tzyw1wdtettsxb X-Rspamd-Queue-Id: 5375240021 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1728471817-847132 X-HE-Meta: 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 LG8NMV3C vVPkuhkDj3X/Ul4IIpdo03TrCTqNirsE+i3OF12pQFRgHh9CfDDPan65RXdq+kScveEB9xsBhuqpsdf/i7+mNUZCy8a5FsStzWMUiyQOOVqTbSgGMYHxPRj4b5BaVZeVkXg/wMr4vZz6mOtxTL084aeR2xMg/kX5PYM5E9zZ416RBsMyCDYgByKHxz71+net+eYUKDDA8y5QhvZSAF5UFkTBzSswQZKMAai+WSU+Yo8gJoMRGYLUSRymOuGHvLLEPbPRNU91d3NjbOGAFGiGHD5iVl81+ZPno1Y/hgjIoYegFNhxm0ciW8V/hnxkz1HlAE6IQI2I97xWvxyq4sFupH4Fi97Wp6p+F5RyTZ4f0lRTxSyw1DBKms1JmFYWOOYEszAHnzUokRFzk2z6V09hVypUP+8FaocPBRfbnbrVTanjC2D+qn9NyKihG4w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --FXfO/TwhQ+C7Uak4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Oct 08, 2024 at 03:37:00PM -0700, Deepak Gupta wrote: > Three architectures (x86, aarch64, riscv) have support for indirect branch > tracking feature in a very similar fashion. On a very high level, indirect > branch tracking is a CPU feature where CPU tracks branches which uses > memory operand to perform control transfer in program. As part of this > tracking on indirect branches, CPU goes in a state where it expects a > landing pad instr on target and if not found then CPU raises some fault > (architecture dependent) Reviewed-by: Mark Brown --FXfO/TwhQ+C7Uak4 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmcGYwQACgkQJNaLcl1U h9AHsQf9H04XFe+wNJxLZrv59pAwdvHe6MP+LVVOFndbjBmbHFTN6qmAISZyqktF SRfj1/m4yG/TwuwLWuBmwzNCYhtdu6T7NxMLpAffd830l1MTkdrF7wQ9gl7ZGRAW hwjTCOjqQG+RiCf8msgkCaHpmTaxQyaaXKijwQLlpjse8yXFagVbB7KFfLnU3SdH EU1KXwsGKBILqKMesYtkE6OZOORH7YEXvvPcvZD2E/I/6ZVodlxghrEiw+L2z358 AVd82hg9g4z+W4RfgoHAuzE0DM7w1omjJCy8JvknSzesQFWBmnyDm/chs8uVbfBH GWu/B4b4XqB14HIbfiwUtTrT1OMnCw== =cHVw -----END PGP SIGNATURE----- --FXfO/TwhQ+C7Uak4--