From patchwork Thu Jul 8 00:55:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaku Yamahata X-Patchwork-Id: 12364371 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=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 6BE57C07E9B for ; Thu, 8 Jul 2021 01:12:02 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 0FCBC61CC4 for ; Thu, 8 Jul 2021 01:12:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0FCBC61CC4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56876 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1Ia9-0000sN-7A for qemu-devel@archiver.kernel.org; Wed, 07 Jul 2021 21:12:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38012) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKn-0001xj-5l for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:09 -0400 Received: from mga12.intel.com ([192.55.52.136]:57600) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKk-0007Kk-KI for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:08 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10038"; a="189101727" X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="189101727" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:58 -0700 X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="423770101" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:58 -0700 From: isaku.yamahata@gmail.com To: qemu-devel@nongnu.org, pbonzini@redhat.com, alistair@alistair23.me, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, mst@redhat.com, cohuck@redhat.com, mtosatti@redhat.com, xiaoyao.li@intel.com, seanjc@google.com, erdemaktas@google.com Subject: [RFC PATCH v2 34/44] target/i386/tdx: set reboot action to shutdown when tdx Date: Wed, 7 Jul 2021 17:55:04 -0700 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=192.55.52.136; envelope-from=isaku.yamahata@intel.com; helo=mga12.intel.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NML_ADSP_CUSTOM_MED=0.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Isaku Yamahata In TDX CPU state is also protected, thus vcpu state can't be reset by VMM. It assumes -action reboot=shutdown instead of silently ignoring vcpu reset. TDX module spec version 344425-002US doesn't support vcpu reset by VMM. VM needs to be destroyed and created again to emulate REBOOT_ACTION_RESET. For simplicity, put its responsibility to management system like libvirt because it's difficult for the current qemu implementation to destroy and re-create KVM VM resources with keeping other resources. If management system wants reboot behavior for its users, it needs to - set reboot_action to REBOOT_ACTION_SHUTDOWN, - set shutdown_action to SHUTDOWN_ACTION_PAUSE optionally and, - subscribe VM state change and on reboot, (destroy qemu if SHUTDOWN_ACTION_PAUSE and) start new qemu. Signed-off-by: Isaku Yamahata --- target/i386/kvm/tdx.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index 1316d95209..0621317b0a 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -25,6 +25,7 @@ #include "qapi/qapi-types-misc-target.h" #include "standard-headers/asm-x86/kvm_para.h" #include "sysemu/sysemu.h" +#include "sysemu/runstate-action.h" #include "sysemu/kvm.h" #include "sysemu/kvm_int.h" #include "sysemu/tdx.h" @@ -363,6 +364,19 @@ static void tdx_guest_init(Object *obj) qemu_mutex_init(&tdx->lock); + /* + * TDX module spec version 344425-002US doesn't support reset of vcpu by + * VMM. VM needs to be destroyed and created again to emulate + * REBOOT_ACTION_RESET. For simplicity, put its responsibility to + * management system like libvirt. + * + * Management system should + * - set reboot_action to REBOOT_ACTION_SHUTDOWN + * - set shutdown_action to SHUTDOWN_ACTION_PAUSE + * - subscribe VM state and on reboot, destroy qemu and start new qemu + */ + reboot_action = REBOOT_ACTION_SHUTDOWN; + tdx->debug = false; object_property_add_bool(obj, "debug", tdx_guest_get_debug, tdx_guest_set_debug);