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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3B41BC54E68 for ; Wed, 20 Mar 2024 00:24:42 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rmjkG-0006BE-0B; Tue, 19 Mar 2024 20:23:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rmjkE-0006Aq-Bu for qemu-devel@nongnu.org; Tue, 19 Mar 2024 20:23:50 -0400 Received: from mgamail.intel.com ([198.175.65.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rmjkC-0003iK-1p for qemu-devel@nongnu.org; Tue, 19 Mar 2024 20:23:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1710894229; x=1742430229; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=Wdws2eTP+posE92UU5Qg7xQy3oQMNWl87P2iBnvm4p4=; b=UYN8xbsWFK1AKE5E7v1QsntsqC5STwhovdU1h/PAUBo4QqBCq8LDPSOh wJV99c/vJZCbc9YkJMTUASxEw1zx0FXgshv/7IInmkTQaMudu6msmgzbP AAazA4Ijs9DVeEM60720l0+ELuZ3+6mWM2QhhiU5N+b98/7kZ80jveUkk FnBQAi0jFO9fhmK605rXyCZQroKu7MfmrK0bvACpEtpindZf+mWRGqcRv F9XV+GmcdjeHJVxBXaRjq8bNNz8f5wps6c7k8BAJL+IT/2e+zgPI45Rud gZfGPjnps8eFpkkArhxsD+oP7bQ0Etg21k2DYHMbiZjRPilKYWE2D4xIO g==; X-IronPort-AV: E=McAfee;i="6600,9927,11018"; a="16942224" X-IronPort-AV: E=Sophos;i="6.07,138,1708416000"; d="scan'208";a="16942224" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Mar 2024 17:23:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,138,1708416000"; d="scan'208";a="13886603" Received: from xiaoyaol-hp-g830.ccr.corp.intel.com (HELO [10.124.242.48]) ([10.124.242.48]) by orviesa010-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Mar 2024 17:23:42 -0700 Message-ID: <1f06acaf-c63e-42b3-b355-3024ded1fd8e@intel.com> Date: Wed, 20 Mar 2024 08:23:39 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] target/i386: Export RFDS bit to guests Content-Language: en-US To: Pawan Gupta Cc: qemu-devel@nongnu.org, Paolo Bonzini , Chao Gao , antonio.gomez.iglesias@linux.intel.com, Daniel Sneddon References: <9a38877857392b5c2deae7e7db1b170d15510314.1710341348.git.pawan.kumar.gupta@linux.intel.com> <7de64137-d11f-4029-b296-3b8a8be35178@intel.com> <20240319150851.kllaqhbfysfkqcey@desk> From: Xiaoyao Li In-Reply-To: <20240319150851.kllaqhbfysfkqcey@desk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=198.175.65.13; envelope-from=xiaoyao.li@intel.com; helo=mgamail.intel.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.422, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 3/19/2024 11:08 PM, Pawan Gupta wrote: > On Tue, Mar 19, 2024 at 12:22:08PM +0800, Xiaoyao Li wrote: >> On 3/13/2024 10:53 PM, Pawan Gupta wrote: >>> Register File Data Sampling (RFDS) is a CPU side-channel vulnerability >>> that may expose stale register value. CPUs that set RFDS_NO bit in MSR >>> IA32_ARCH_CAPABILITIES indicate that they are not vulnerable to RFDS. >>> Similarly, RFDS_CLEAR indicates that CPU is affected by RFDS, and has >>> the microcode to help mitigate RFDS. >>> >>> Make RFDS_CLEAR and RFDS_NO bits available to guests. >> >> What's the status of KVM part? > > KVM part is already upstreamed and backported: > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.8.1&id=50d33b98b1e23d1cd8743b3cac7a0ae5718b8b00 I see. It was not sent to kvm maillist and not merged through KVM tree. With KVM part in palce, Reviewed-by: Xiaoyao Li