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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 57A32C433EF for ; Mon, 13 Sep 2021 15:57:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3CE6261209 for ; Mon, 13 Sep 2021 15:57:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343720AbhIMP5k (ORCPT ); Mon, 13 Sep 2021 11:57:40 -0400 Received: from 8bytes.org ([81.169.241.247]:56836 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235050AbhIMP5g (ORCPT ); Mon, 13 Sep 2021 11:57:36 -0400 Received: from cap.home.8bytes.org (p549ad441.dip0.t-ipconnect.de [84.154.212.65]) (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 733CA364; Mon, 13 Sep 2021 17:56:17 +0200 (CEST) From: Joerg Roedel To: x86@kernel.org Cc: Eric Biederman , kexec@lists.infradead.org, Joerg Roedel , stable@vger.kernel.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 , Joerg Roedel , linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v2 02/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest Date: Mon, 13 Sep 2021 17:55:53 +0200 Message-Id: <20210913155603.28383-3-joro@8bytes.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913155603.28383-1-joro@8bytes.org> References: <20210913155603.28383-1-joro@8bytes.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Joerg Roedel For now, kexec is not supported when running as an SEV-ES guest. Doing so requires additional hypervisor support and special code to hand over the CPUs to the new kernel in a safe way. Until this is implemented, do not support kexec in SEV-ES guests. Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Joerg Roedel --- arch/x86/kernel/machine_kexec_64.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index 131f30fdcfbd..a8e16a411b40 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -591,3 +591,11 @@ void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) */ set_memory_encrypted((unsigned long)vaddr, pages); } + +/* + * Kexec is not supported in SEV-ES guests yet + */ +bool arch_kexec_supported(void) +{ + return !sev_es_active(); +} -- 2.33.0