From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752309AbaHDK6g (ORCPT ); Mon, 4 Aug 2014 06:58:36 -0400 Received: from mga11.intel.com ([192.55.52.93]:37373 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751598AbaHDK6e (ORCPT ); Mon, 4 Aug 2014 06:58:34 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,797,1400050800"; d="scan'208";a="571395339" From: Wanpeng Li To: Paolo Bonzini , Jan Kiszka Cc: Marcelo Tosatti , Gleb Natapov , Bandan Das , Zhang Yang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Wanpeng Li Subject: [PATCH v3] KVM: nVMX: nested TPR shadow/threshold emulation Date: Mon, 4 Aug 2014 18:58:27 +0800 Message-Id: <1407149907-13483-1-git-send-email-wanpeng.li@linux.intel.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch fix bug https://bugzilla.kernel.org/show_bug.cgi?id=61411 TPR shadow/threshold feature is important to speed up the Windows guest. Besides, it is a must feature for certain VMM. We map virtual APIC page address and TPR threshold from L1 VMCS. If TPR_BELOW_THRESHOLD VM exit is triggered by L2 guest and L1 interested in, we inject it into L1 VMM for handling. Signed-off-by: Wanpeng Li --- v2 -> v3: * nested vm entry failure if both tpr shadow and cr8 exiting bits are not set v1 -> v2: * don't take L0's "virtualize APIC accesses" setting into account * virtual_apic_page do exactly the same thing that is done for apic_access_page * add the tpr threshold field to the read-write fields for shadow VMCS arch/x86/kvm/vmx.c | 38 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index c604f3c..7a56e2c 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -379,6 +379,7 @@ struct nested_vmx { * we must keep them pinned while L2 runs. */ struct page *apic_access_page; + struct page *virtual_apic_page; u64 msr_ia32_feature_control; struct hrtimer preemption_timer; @@ -533,6 +534,7 @@ static int max_shadow_read_only_fields = ARRAY_SIZE(shadow_read_only_fields); static unsigned long shadow_read_write_fields[] = { + TPR_THRESHOLD, GUEST_RIP, GUEST_RSP, GUEST_CR0, @@ -2330,7 +2332,7 @@ static __init void nested_vmx_setup_ctls_msrs(void) CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING | CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING | CPU_BASED_RDPMC_EXITING | CPU_BASED_RDTSC_EXITING | - CPU_BASED_PAUSE_EXITING | + CPU_BASED_PAUSE_EXITING | CPU_BASED_TPR_SHADOW | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; /* * We can allow some features even when not supported by the @@ -6148,6 +6150,10 @@ static void free_nested(struct vcpu_vmx *vmx) nested_release_page(vmx->nested.apic_access_page); vmx->nested.apic_access_page = 0; } + if (vmx->nested.virtual_apic_page) { + nested_release_page(vmx->nested.virtual_apic_page); + vmx->nested.virtual_apic_page = 0; + } nested_free_all_saved_vmcss(vmx); } @@ -6936,7 +6942,7 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu) case EXIT_REASON_MCE_DURING_VMENTRY: return 0; case EXIT_REASON_TPR_BELOW_THRESHOLD: - return 1; + return nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW); case EXIT_REASON_APIC_ACCESS: return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES); @@ -7057,6 +7063,9 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu) static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) { + if (is_guest_mode(vcpu)) + return; + if (irr == -1 || tpr < irr) { vmcs_write32(TPR_THRESHOLD, 0); return; @@ -8024,6 +8033,27 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; exec_control &= ~CPU_BASED_TPR_SHADOW; exec_control |= vmcs12->cpu_based_vm_exec_control; + + if (exec_control & CPU_BASED_TPR_SHADOW) { + if (vmx->nested.virtual_apic_page) + nested_release_page(vmx->nested.virtual_apic_page); + vmx->nested.virtual_apic_page = + nested_get_page(vcpu, vmcs12->virtual_apic_page_addr); + if (!vmx->nested.virtual_apic_page) + exec_control &= + ~CPU_BASED_TPR_SHADOW; + else + vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, + page_to_phys(vmx->nested.virtual_apic_page)); + + if (!(exec_control & CPU_BASED_TPR_SHADOW) && + !((exec_control & CPU_BASED_CR8_LOAD_EXITING) && + (exec_control & CPU_BASED_CR8_STORE_EXITING))) + nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); + + vmcs_write32(TPR_THRESHOLD, vmcs12->tpr_threshold); + } + /* * Merging of IO and MSR bitmaps not currently supported. * Rather, exit every time. @@ -8802,6 +8832,10 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, nested_release_page(vmx->nested.apic_access_page); vmx->nested.apic_access_page = 0; } + if (vmx->nested.virtual_apic_page) { + nested_release_page(vmx->nested.virtual_apic_page); + vmx->nested.virtual_apic_page = 0; + } /* * Exiting from L2 to L1, we're now back to L1 which thinks it just -- 1.9.1