From patchwork Thu Jan 27 10:10:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joerg Roedel X-Patchwork-Id: 537955 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DE82C433FE for ; Thu, 27 Jan 2022 10:11:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231360AbiA0KLY (ORCPT ); Thu, 27 Jan 2022 05:11:24 -0500 Received: from 8bytes.org ([81.169.241.247]:47880 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238926AbiA0KLX (ORCPT ); Thu, 27 Jan 2022 05:11:23 -0500 Received: from cap.home.8bytes.org (p549ad610.dip0.t-ipconnect.de [84.154.214.16]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by theia.8bytes.org (Postfix) with ESMTPSA id 0B61F3E6; Thu, 27 Jan 2022 11:11:19 +0100 (CET) From: Joerg Roedel To: x86@kernel.org Cc: Joerg Roedel , Joerg Roedel , stable@vger.kernel.org, Eric Biederman , kexec@lists.infradead.org, hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , David Rientjes , Cfir Cohen , Erdem Aktas , Masami Hiramatsu , Mike Stunes , Sean Christopherson , Martin Radev , Arvind Sankar , linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v3 01/10] x86/kexec/64: Disable kexec when SEV-ES is active Date: Thu, 27 Jan 2022 11:10:35 +0100 Message-Id: <20220127101044.13803-2-joro@8bytes.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220127101044.13803-1-joro@8bytes.org> References: <20220127101044.13803-1-joro@8bytes.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Joerg Roedel SEV-ES needs special handling to support kexec. Disable it when SEV-ES is active until support is implemented. Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Joerg Roedel --- arch/x86/kernel/machine_kexec_64.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index f5da4a18070a..5079a75f8944 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -269,11 +269,22 @@ static void load_segments(void) ); } +static bool machine_kexec_supported(void) +{ + if (cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) + return false; + + return true; +} + int machine_kexec_prepare(struct kimage *image) { unsigned long start_pgtable; int result; + if (!machine_kexec_supported()) + return -ENOSYS; + /* Calculate the offsets */ start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;