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=-10.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 72062C433EF for ; Thu, 2 Sep 2021 18:41:57 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 11DB0610E8 for ; Thu, 2 Sep 2021 18:41:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 11DB0610E8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 86BD16B0072; Thu, 2 Sep 2021 14:41:56 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 81BE76B0073; Thu, 2 Sep 2021 14:41:56 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6BD6E8D0001; Thu, 2 Sep 2021 14:41:56 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0249.hostedemail.com [216.40.44.249]) by kanga.kvack.org (Postfix) with ESMTP id 5F4DF6B0072 for ; Thu, 2 Sep 2021 14:41:56 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 190D81823021E for ; Thu, 2 Sep 2021 18:41:56 +0000 (UTC) X-FDA: 78543502632.25.082FF9D Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf15.hostedemail.com (Postfix) with ESMTP id CA2F2D000096 for ; Thu, 2 Sep 2021 18:41:55 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 1EF57610A2; Thu, 2 Sep 2021 18:41:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1630608115; bh=6BoMcP5chkSrsK2RXEOXpWWeA5RODkgv0ciR/OeFF8g=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=axDU97TcWl+9FSZON5idbTgysIzP76JnTwD2j70wq7tXEJG584bESMkUgODDcoXmG 6h0E9pFLwN4xCMh7eji6pPQPs/K2m/m43kPVPem6kHCDQ7tk9Mlyhx++NPF3AcwXBs Kv3O0fGOGSPHbSOxgSBAdKOr4PG+KVRhtYEGdZBymVGSGOamZbyVNJwF6K2X+twFOl +FX0hC6Zsg5AfnH/DBVHfjJRIM8hYa8aVX/yf3WbDBFMM8KLCPx5Ypg05oUoyCZS9U BhweFV3VPwGpbLXpsnRi2iyaHG5zy3mF+GOn5ZoZ8byw5L6VBaDpcqBE7qp1TsQQNa 4esShkL525PWA== Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory To: Joerg Roedel Cc: Yu Zhang , David Hildenbrand , Sean Christopherson , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm list , Linux Kernel Mailing List , Borislav Petkov , Andrew Morton , Andi Kleen , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , "Peter Zijlstra (Intel)" , Ingo Molnar , Varad Gautam , Dario Faggioli , the arch/x86 maintainers , linux-mm@kvack.org, linux-coco@lists.linux.dev, "Kirill A. Shutemov" , "Kirill A . Shutemov" , Sathyanarayanan Kuppuswamy , Dave Hansen References: <20210824005248.200037-1-seanjc@google.com> <307d385a-a263-276f-28eb-4bc8dd287e32@redhat.com> <20210827023150.jotwvom7mlsawjh4@linux.intel.com> <8f3630ff-bd6d-4d57-8c67-6637ea2c9560@www.fastmail.com> <20210901102437.g5wrgezmrjqn3mvy@linux.intel.com> From: Andy Lutomirski Message-ID: Date: Thu, 2 Sep 2021 11:41:53 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=axDU97Tc; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf15.hostedemail.com: domain of luto@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=luto@kernel.org X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: CA2F2D000096 X-Stat-Signature: 4usjw4e6o15p3zj3umrfzgewgg91zuhq X-HE-Tag: 1630608115-300481 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: On 9/2/21 2:27 AM, Joerg Roedel wrote: > On Wed, Sep 01, 2021 at 09:07:59AM -0700, Andy Lutomirski wrote: >> In principle, you could actually initialize a TDX guest with all of its >> memory shared and all of it mapped in the host IOMMU. > > Not sure how this works in TDX, but in SEV code fetches are always > treated as encrypted. So this approach would not work with SEV, not to > speak about attestation, which will not work with this approach either > :) > Oof.