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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 E1414C4338F for ; Sun, 15 Aug 2021 14:39:23 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2C2D561151 for ; Sun, 15 Aug 2021 14:39:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2C2D561151 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Gng0n2gntz3bhl for ; Mon, 16 Aug 2021 00:39:21 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=alien8.de header.i=@alien8.de header.a=rsa-sha256 header.s=dkim header.b=Ynjh7QDJ; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=alien8.de (client-ip=5.9.137.197; helo=mail.skyhub.de; envelope-from=bp@alien8.de; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=alien8.de header.i=@alien8.de header.a=rsa-sha256 header.s=dkim header.b=Ynjh7QDJ; dkim-atps=neutral Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Gng0066rfz302N for ; Mon, 16 Aug 2021 00:38:39 +1000 (AEST) Received: from zn.tnic (p200300ec2f26310039d0ba97aac93c10.dip0.t-ipconnect.de [IPv6:2003:ec:2f26:3100:39d0:ba97:aac9:3c10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 5FF7A1EC0505; Sun, 15 Aug 2021 16:38:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1629038311; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=jL5qXq5tPSUlQog/FJ5eZ1GT2YpJvvVnQmTTUk0cbrA=; b=Ynjh7QDJnobQuRzRBtXZMflPEf0vTQxZ/1e/DI2MnZmP0BU3+0pTK5ZZQ5Gk5RnrPuYHa6 IdpdAyOEUiLJZd8HI6wSzceOtBbAWAY0K9LHdKOg+Qfc/RBmkhxNql4Enc7Gc4LTKOJnaI 0ETWtaeGc2m89ri2xInjGo/yEh1iYis= Date: Sun, 15 Aug 2021 16:39:09 +0200 From: Borislav Petkov To: Tom Lendacky Subject: Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has() Message-ID: References: <7d55bac0cf2e73f53816bce3a3097877ed9663f3.1628873970.git.thomas.lendacky@amd.com> <4710eb91-d054-7b31-5106-09e3e54bba9e@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4710eb91-d054-7b31-5106-09e3e54bba9e@amd.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sathyanarayanan Kuppuswamy , linux-efi@vger.kernel.org, Brijesh Singh , kvm@vger.kernel.org, Peter Zijlstra , Dave Hansen , dri-devel@lists.freedesktop.org, platform-driver-x86@vger.kernel.org, linux-s390@vger.kernel.org, Andi Kleen , Joerg Roedel , x86@kernel.org, amd-gfx@lists.freedesktop.org, Ingo Molnar , linux-graphics-maintainer@vmware.com, Joerg Roedel , Tianyu Lan , Andy Lutomirski , Thomas Gleixner , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Sun, Aug 15, 2021 at 08:53:31AM -0500, Tom Lendacky wrote: > It's not a cross-vendor thing as opposed to a KVM or other hypervisor > thing where the family doesn't have to be reported as AMD or HYGON. What would be the use case? A HV starts a guest which is supposed to be encrypted using the AMD's confidential guest technology but the HV tells the guest that it is not running on an AMD SVM HV but something else? Is that even an actual use case? Or am I way off? I know we have talked about this in the past but this still sounds insane. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette