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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 20A6BC43214 for ; Sat, 14 Aug 2021 18:32:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 009A6604D7 for ; Sat, 14 Aug 2021 18:32:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238997AbhHNScp (ORCPT ); Sat, 14 Aug 2021 14:32:45 -0400 Received: from mail.skyhub.de ([5.9.137.197]:59380 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233713AbhHNSco (ORCPT ); Sat, 14 Aug 2021 14:32:44 -0400 Received: from zn.tnic (p200300ec2f1db90092f0c5d5424adff0.dip0.t-ipconnect.de [IPv6:2003:ec:2f1d:b900:92f0:c5d5:424a:dff0]) (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 18F4D1EC03D5; Sat, 14 Aug 2021 20:32:10 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1628965930; 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=wF+abY2BQsJbjTrcR+vEXegmF8fSVZNnTVHwv8EJcnQ=; b=E4Qk5UWHuniXg4G1qquKyzpgwZxdDOaCXRqHrAIJykq2qzFHsvToSzhtSszwEfmGfSV6v2 I5QqIZa+pz8OAA9XFKUyZCM9wxA5OIK4n52a7NMv/GJIh9ii9QfkxahlKZf58K1pY/P4Uq 2W5ojEdMC06o3XDrAinHQLW8qtTO9aY= Date: Sat, 14 Aug 2021 20:32:48 +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 , Joerg Roedel Subject: Re: [PATCH v2 02/12] mm: Introduce a function to check for virtualization protection features Message-ID: References: <482fe51f1671c1cd081039801b03db7ec0036332.1628873970.git.thomas.lendacky@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <482fe51f1671c1cd081039801b03db7ec0036332.1628873970.git.thomas.lendacky@amd.com> Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org On Fri, Aug 13, 2021 at 11:59:21AM -0500, Tom Lendacky wrote: > In prep for other protected virtualization technologies, introduce a > generic helper function, prot_guest_has(), that can be used to check > for specific protection attributes, like memory encryption. This is > intended to eliminate having to add multiple technology-specific checks > to the code (e.g. if (sev_active() || tdx_active())). > > Reviewed-by: Joerg Roedel > Co-developed-by: Andi Kleen > Signed-off-by: Andi Kleen > Co-developed-by: Kuppuswamy Sathyanarayanan > Signed-off-by: Kuppuswamy Sathyanarayanan > Signed-off-by: Tom Lendacky > --- > arch/Kconfig | 3 +++ > include/linux/protected_guest.h | 35 +++++++++++++++++++++++++++++++++ > 2 files changed, 38 insertions(+) > create mode 100644 include/linux/protected_guest.h > > diff --git a/arch/Kconfig b/arch/Kconfig > index 98db63496bab..bd4f60c581f1 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -1231,6 +1231,9 @@ config RELR > config ARCH_HAS_MEM_ENCRYPT > bool > > +config ARCH_HAS_PROTECTED_GUEST > + bool > + > config HAVE_SPARSE_SYSCALL_NR > bool > help > diff --git a/include/linux/protected_guest.h b/include/linux/protected_guest.h > new file mode 100644 > index 000000000000..43d4dde94793 > --- /dev/null > +++ b/include/linux/protected_guest.h > @@ -0,0 +1,35 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Protected Guest (and Host) Capability checks > + * > + * Copyright (C) 2021 Advanced Micro Devices, Inc. > + * > + * Author: Tom Lendacky > + */ > + > +#ifndef _PROTECTED_GUEST_H > +#define _PROTECTED_GUEST_H > + > +#ifndef __ASSEMBLY__ ^^^^^^^^^^^^^ Do you really need that guard? It builds fine without it too. Or something coming later does need it...? -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette