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 670B4C433EF for ; Thu, 24 Mar 2022 14:37:57 +0000 (UTC) Received: from localhost ([::1]:41642 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nXOb6-0004b9-8a for qemu-devel@archiver.kernel.org; Thu, 24 Mar 2022 10:37:56 -0400 Received: from eggs.gnu.org ([209.51.188.92]:38584) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nXOaD-0003gS-Ht for qemu-devel@nongnu.org; Thu, 24 Mar 2022 10:37:02 -0400 Received: from mga06.intel.com ([134.134.136.31]:50418) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nXOaB-0001bY-Fj for qemu-devel@nongnu.org; Thu, 24 Mar 2022 10:37:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1648132619; x=1679668619; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=kuUZZE3Y+2nYQ+xUdxnV5mXzvQrIWXlqswvHHABl52o=; b=kdspzDJ68W7mk3tWdkicVgHsMIux/clHKeP3nUhudorw29rPP62v78zQ vXCfcVAI8FOvM83IWtSsrPkRrE8tG8eKRM31scKlg3bdD3aPxpHFuG4vY TVFTwCBJCyquMXO5IChMJjYcCGhWm+7RkJAyyn2qZK7lRKa0tBENwhJH8 ZnPd7HxGvnvDFg3Kl8dJk1LSLB52Q7xeZC2jEc4LYsmR5219OQZW+kkbw p+zhGYLxCdUqllB58GKfd6JnI8i6kAp5k7wudyGt9I6JiJqMCPmnw+N/p GcXFgRMmvLcNh1qJu99ymP9Ul9trGQh0u/pBmBZtPf1tHRNGboGvBIgBC A==; X-IronPort-AV: E=McAfee;i="6200,9189,10295"; a="319099860" X-IronPort-AV: E=Sophos;i="5.90,207,1643702400"; d="scan'208";a="319099860" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2022 07:36:57 -0700 X-IronPort-AV: E=Sophos;i="5.90,207,1643702400"; d="scan'208";a="561397107" Received: from xiaoyaol-hp-g830.ccr.corp.intel.com (HELO [10.255.29.242]) ([10.255.29.242]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2022 07:36:53 -0700 Message-ID: Date: Thu, 24 Mar 2022 22:36:51 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 Thunderbird/91.6.1 Subject: Re: [RFC PATCH v3 12/36] i386/tdx: Add property sept-ve-disable for tdx-guest object Content-Language: en-US To: Gerd Hoffmann References: <20220317135913.2166202-1-xiaoyao.li@intel.com> <20220317135913.2166202-13-xiaoyao.li@intel.com> <20220322090238.6job2whybu6ntor7@sirius.home.kraxel.org> <20220324075703.7ha44rd463uwnl55@sirius.home.kraxel.org> <4fc788e8-1805-c7cd-243d-ccd2a6314a68@intel.com> <20220324093725.hs3kpcehsbklacnj@sirius.home.kraxel.org> From: Xiaoyao Li In-Reply-To: <20220324093725.hs3kpcehsbklacnj@sirius.home.kraxel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=134.134.136.31; envelope-from=xiaoyao.li@intel.com; helo=mga06.intel.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_RANDOM_ENVFROM=0.998, HK_RANDOM_FROM=0.998, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, 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: , Cc: isaku.yamahata@intel.com, Marcelo Tosatti , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , kvm@vger.kernel.org, "Michael S. Tsirkin" , Connor Kuehl , Eric Blake , Cornelia Huck , Richard Henderson , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , qemu-devel@nongnu.org, seanjc@google.com, erdemaktas@google.com, Paolo Bonzini , Laszlo Ersek Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/24/2022 5:37 PM, Gerd Hoffmann wrote: > Hi, > >> #VE can be triggered in various situations. e.g., CPUID on some leaves, and >> RD/WRMSR on some MSRs. #VE on pending page is just one of the sources, Linux >> just wants to disable this kind of #VE since it wants to prevent unexpected >> #VE during SYSCALL gap. > > Linux guests can't disable those on their own? Requiring this being > configured on the host looks rather fragile to me ... Yes, current TDX architecture doesn't allow TD guest to do so. Maybe in the future, it can be allowed, maybe. > take care, > Gerd >