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 X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3481C433DB for ; Wed, 3 Feb 2021 17:47:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 55C2364E4F for ; Wed, 3 Feb 2021 17:47:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231274AbhBCRqt (ORCPT ); Wed, 3 Feb 2021 12:46:49 -0500 Received: from mga04.intel.com ([192.55.52.120]:12562 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231236AbhBCRqs (ORCPT ); Wed, 3 Feb 2021 12:46:48 -0500 IronPort-SDR: jUKXGgUlyfMZ+sxN9PB5vmpcb1WJ0dpcOmPItZfxjuMDAmcDqP+TsX4S0zU7wZtI6AOKeQBMqF AbIXLXCitl+Q== X-IronPort-AV: E=McAfee;i="6000,8403,9884"; a="178524484" X-IronPort-AV: E=Sophos;i="5.79,399,1602572400"; d="scan'208";a="178524484" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2021 09:46:08 -0800 IronPort-SDR: f/RpxycFolcEOcNgYjhr+Zd72520VG3ZUcAutWmuHfwYm0SIhNHtjfAT77fCuoTVswihDcWagN ahPFSTN0w09A== X-IronPort-AV: E=Sophos;i="5.79,399,1602572400"; d="scan'208";a="356099374" Received: from pmehra-mobl.amr.corp.intel.com (HELO [10.255.230.38]) ([10.255.230.38]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2021 09:46:06 -0800 Subject: Re: [RFC PATCH v3 00/27] KVM SGX virtualization support To: Paolo Bonzini , Sean Christopherson Cc: "Edgecombe, Rick P" , "linux-sgx@vger.kernel.org" , "kvm@vger.kernel.org" , "Huang, Kai" , "x86@kernel.org" , "corbet@lwn.net" , "luto@kernel.org" , "jethro@fortanix.com" , "wanpengli@tencent.com" , "mingo@redhat.com" , "b.thiel@posteo.de" , "tglx@linutronix.de" , "jarkko@kernel.org" , "joro@8bytes.org" , "hpa@zytor.com" , "jmattson@google.com" , "vkuznets@redhat.com" , "bp@alien8.de" , "Huang, Haitao" References: <4b4b9ed1d7756e8bccf548fc41d05c7dd8367b33.camel@intel.com> <99135352-8e10-fe81-f0dc-8d552d73e3d3@intel.com> <475c5f8b-efb7-629d-b8d2-2916ee150e4f@redhat.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <475c5f8b-efb7-629d-b8d2-2916ee150e4f@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org On 2/3/21 9:43 AM, Paolo Bonzini wrote: > On 03/02/21 18:36, Sean Christopherson wrote: >> I'm not at all opposed to preventing KVM from accessing EPC, but I >> really don't want to add a special check in KVM to avoid reading EPC. >> KVM generally isn't aware of physical backings, and the relevant KVM >> code is shared between all architectures. > > Yeah, special casing KVM is almost always the wrong thing to do. > Anything that KVM can do, other subsystems will do as well. Agreed. Thwarting ioremap itself seems like the right way to go.