From patchwork Tue Jul 31 15:32:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 10550941 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F299913B8 for ; Tue, 31 Jul 2018 15:32:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E24E528F03 for ; Tue, 31 Jul 2018 15:32:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D6AF8295FA; Tue, 31 Jul 2018 15:32:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 72D8628F03 for ; Tue, 31 Jul 2018 15:32:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732454AbeGaRN2 (ORCPT ); Tue, 31 Jul 2018 13:13:28 -0400 Received: from mga03.intel.com ([134.134.136.65]:23684 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732425AbeGaRN2 (ORCPT ); Tue, 31 Jul 2018 13:13:28 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 31 Jul 2018 08:32:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,427,1526367600"; d="scan'208";a="79342630" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.132]) by orsmga002.jf.intel.com with ESMTP; 31 Jul 2018 08:32:20 -0700 From: Sean Christopherson To: kvm@vger.kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com Cc: jmattson@google.com, Sean Christopherson Subject: [PATCH 06/16] KVM: nVMX: try to set EFER bits correctly when init'ing entry controls Date: Tue, 31 Jul 2018 08:32:05 -0700 Message-Id: <20180731153215.31794-7-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180731153215.31794-1-sean.j.christopherson@intel.com> References: <20180731153215.31794-1-sean.j.christopherson@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP VM_ENTRY_IA32E_MODE and VM_{ENTRY,EXIT}_LOAD_IA32_EFER will be explicitly set/cleared as needed by vmx_set_efer(), but attempt to get the bits set correctly when intializing the control fields. Setting the value correctly can avoid multiple VMWrites. Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx.c | 44 ++++++++++++++++++++++++++++++-------------- 1 file changed, 30 insertions(+), 14 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 51726276e71d..24a25e7d4b40 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -11146,6 +11146,17 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool ne return 0; } +static u64 nested_vmx_calc_efer(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12) +{ + if (vmx->nested.nested_run_pending && + (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) + return vmcs12->guest_ia32_efer; + else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) + return vmx->vcpu.arch.efer | (EFER_LMA | EFER_LME); + else + return vmx->vcpu.arch.efer & ~(EFER_LMA | EFER_LME); +} + static void prepare_vmcs02_full(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { struct vcpu_vmx *vmx = to_vmx(vcpu); @@ -11284,6 +11295,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, { struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exec_control, vmcs12_exec_ctrl; + u64 guest_efer; if (vmx->nested.dirty_vmcs12) { prepare_vmcs02_full(vcpu, vmcs12); @@ -11438,13 +11450,23 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, */ vm_exit_controls_init(vmx, vmcs_config.vmexit_ctrl); - /* vmcs12's VM_ENTRY_LOAD_IA32_EFER and VM_ENTRY_IA32E_MODE are - * emulated by vmx_set_efer(), below. + /* + * vmcs12's VM_{ENTRY,EXIT}_LOAD_IA32_EFER and VM_ENTRY_IA32E_MODE + * are emulated by vmx_set_efer(), below, but speculate on the + * related bits (if supported by the CPU) in the hope that we can + * avoid VMWrites during vmx_set_efer(). */ - vm_entry_controls_init(vmx, - (vmcs12->vm_entry_controls & ~VM_ENTRY_LOAD_IA32_EFER & - ~VM_ENTRY_IA32E_MODE) | - (vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE)); + exec_control = (vmcs12->vm_entry_controls | vmcs_config.vmentry_ctrl) & + ~VM_ENTRY_IA32E_MODE & ~VM_ENTRY_LOAD_IA32_EFER; + + guest_efer = nested_vmx_calc_efer(vmx, vmcs12); + if (cpu_has_load_ia32_efer) { + if (guest_efer & EFER_LMA) + exec_control |= VM_ENTRY_IA32E_MODE; + if (guest_efer != host_efer) + exec_control |= VM_ENTRY_LOAD_IA32_EFER; + } + vm_entry_controls_init(vmx, exec_control); if (vmx->nested.nested_run_pending && (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)) { @@ -11510,14 +11532,8 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, vmx_set_cr4(vcpu, vmcs12->guest_cr4); vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12)); - if (vmx->nested.nested_run_pending && - (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) - vcpu->arch.efer = vmcs12->guest_ia32_efer; - else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) - vcpu->arch.efer |= (EFER_LMA | EFER_LME); - else - vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); - /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ + vcpu->arch.efer = guest_efer; + /* Note: may modify VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ vmx_set_efer(vcpu, vcpu->arch.efer); /*