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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 9D65FC433DB for ; Fri, 12 Feb 2021 16:18:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2AF0564E77 for ; Fri, 12 Feb 2021 16:18:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2AF0564E77 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id ABDC38D006A; Fri, 12 Feb 2021 11:18:53 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A471B8D0060; Fri, 12 Feb 2021 11:18:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 95CDA8D006A; Fri, 12 Feb 2021 11:18:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0193.hostedemail.com [216.40.44.193]) by kanga.kvack.org (Postfix) with ESMTP id 7BC978D0060 for ; Fri, 12 Feb 2021 11:18:53 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3F7491DFF for ; Fri, 12 Feb 2021 16:18:53 +0000 (UTC) X-FDA: 77810124546.07.57C0DD0 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf20.hostedemail.com (Postfix) with ESMTP id 23391DC for ; Fri, 12 Feb 2021 16:18:50 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 622D6AC90; Fri, 12 Feb 2021 16:18:51 +0000 (UTC) Date: Fri, 12 Feb 2021 17:18:49 +0100 From: Joerg Roedel To: Peter Zijlstra Cc: David Rientjes , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , "Kirill A. Shutemov" , Andi Kleen , Brijesh Singh , Tom Lendacky , Jon Grimm , Thomas Gleixner , Christoph Hellwig , Paolo Bonzini , Ingo Molnar , x86@kernel.org, linux-mm@kvack.org Subject: Re: AMD SEV-SNP/Intel TDX: validation of memory pages Message-ID: <20210212161849.GB28884@suse.de> References: <7515a81a-19e-b063-2081-3f5e79f0f7a8@google.com> <20210212131907.GI5453@suse.de> <20210212145318.GK5453@suse.de> <20210212152813.GA28884@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 23391DC X-Stat-Signature: p3mwg1fdsxe51xm516xhgcndsunwzwj1 Received-SPF: none (suse.de>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=mx2.suse.de; client-ip=195.135.220.15 X-HE-DKIM-Result: none/none X-HE-Tag: 1613146730-117305 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 Fri, Feb 12, 2021 at 05:12:41PM +0100, Peter Zijlstra wrote: > On Fri, Feb 12, 2021 at 04:28:13PM +0100, Joerg Roedel wrote: > > I don't know the details about TDX and #VE, but could a malicious HV not > > trigger a #VE basically everywhere by mapping around pages? So 'fail' > > means panic() in this case, right? > > Right. To fail reliably, doesn't that mean the #VE vector needs to be IST? "Everywhere" could also be in the SYSCALL entry path before there is a trusted stack. Regards, Joerg