From patchwork Thu Jul 8 00:54:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaku Yamahata X-Patchwork-Id: 12364369 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 0034EC07E95 for ; Thu, 8 Jul 2021 01:11:59 +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 A853A61CD4 for ; Thu, 8 Jul 2021 01:11:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A853A61CD4 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]:56596 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1Ia6-0000fm-Rl for qemu-devel@archiver.kernel.org; Wed, 07 Jul 2021 21:11:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38166) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKt-0002B3-0X for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:17 -0400 Received: from mga03.intel.com ([134.134.136.65]:19099) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKq-0007Mo-II for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:14 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10038"; a="209461999" X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="209461999" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:54 -0700 X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="423770010" 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 17:55:54 -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 07/44] i386/kvm: Squash getting/putting guest state for TDX VMs Date: Wed, 7 Jul 2021 17:54:37 -0700 Message-Id: <7194a76cfb8541d4f7a5b6a04fb3496bc14eab15.1625704980.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=134.134.136.65; envelope-from=isaku.yamahata@intel.com; helo=mga03.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_NONE=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, Sean Christopherson , isaku.yamahata@gmail.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Sean Christopherson Ignore get/put state of TDX VMs as accessing/mutating guest state of producation TDs is not supported. Allow kvm_arch_get_registers() to run as normal, except for MSRs, for debug TDs, and silently ignores attempts to read guest state for non-debug TDs. Signed-off-by: Sean Christopherson Signed-off-by: Isaku Yamahata --- target/i386/kvm/kvm.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index a3d5b334d1..27b64dedc2 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -2641,6 +2641,11 @@ void kvm_put_apicbase(X86CPU *cpu, uint64_t value) { int ret; + /* TODO: Allow accessing guest state for debug TDs. */ + if (vm_type == KVM_X86_TDX_VM) { + return; + } + ret = kvm_put_one_msr(cpu, MSR_IA32_APICBASE, value); assert(ret == 1); } @@ -4099,6 +4104,11 @@ int kvm_arch_put_registers(CPUState *cpu, int level) assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu)); + /* TODO: Allow accessing guest state for debug TDs. */ + if (vm_type == KVM_X86_TDX_VM) { + return 0; + } + /* must be before kvm_put_nested_state so that EFER.SVME is set */ ret = kvm_put_sregs(x86_cpu); if (ret < 0) { @@ -4209,9 +4219,11 @@ int kvm_arch_get_registers(CPUState *cs) if (ret < 0) { goto out; } - ret = kvm_get_msrs(cpu); - if (ret < 0) { - goto out; + if (vm_type != KVM_X86_TDX_VM) { + ret = kvm_get_msrs(cpu); + if (ret < 0) { + goto out; + } } ret = kvm_get_apic(cpu); if (ret < 0) {