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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 E96BEC4338F for ; Mon, 16 Aug 2021 07:14:18 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 97F496023E for ; Mon, 16 Aug 2021 07:14:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 97F496023E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9F67489C85; Mon, 16 Aug 2021 07:14:13 +0000 (UTC) X-Greylist: delayed 70227 seconds by postgrey-1.36 at gabe; Sun, 15 Aug 2021 14:38:49 UTC Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by gabe.freedesktop.org (Postfix) with ESMTPS id 04E8C897D7; Sun, 15 Aug 2021 14:38:37 +0000 (UTC) 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 Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-graphics-maintainer@vmware.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, Brijesh Singh , Joerg Roedel , Andi Kleen , Sathyanarayanan Kuppuswamy , Tianyu Lan , Thomas Gleixner , Ingo Molnar , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Joerg Roedel 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-Mailman-Approved-At: Mon, 16 Aug 2021 07:13:00 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" 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