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Fri, 2 Mar 2018 16:17:57 +0000 From: Babu Moger To: joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: babu.moger@amd.com, pbonzini@redhat.com, rkrcmar@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC 3/3] arch/x86/kvm: SVM: Introduce pause loop exit logic in SVM Date: Fri, 2 Mar 2018 11:17:36 -0500 Message-Id: <1520007456-85293-4-git-send-email-babu.moger@amd.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1520007456-85293-1-git-send-email-babu.moger@amd.com> References: <1520007456-85293-1-git-send-email-babu.moger@amd.com> MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: BN6PR14CA0041.namprd14.prod.outlook.com (10.171.172.155) To BN6PR12MB1761.namprd12.prod.outlook.com (10.175.101.22) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: c22a8aef-8911-46f9-5a29-08d5805929c9 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(2017052603307)(7153060)(7193020); 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We have noticed it help in situations where numerous pauses are generated due to spinlock or other scenarios. Tested it with idle=poll and noticed pause interceptions go down considerably. Signed-off-by: Babu Moger --- arch/x86/kvm/svm.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++- arch/x86/kvm/x86.h | 1 + 2 files changed, 114 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 50a4e95..30bc851 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -263,6 +263,55 @@ struct amd_svm_iommu_ir { static bool npt_enabled; #endif +/* + * These 2 parameters are used to config the controls for Pause-Loop Exiting: + * pause_filter_thresh: On processors that support Pause filtering(indicated + * by CPUID Fn8000_000A_EDX), the VMCB provides a 16 bit pause filter + * count value. On VMRUN this value is loaded into an internal counter. + * Each time a pause instruction is executed, this counter is decremented + * until it reaches zero at which time a #VMEXIT is generated if pause + * intercept is enabled. Refer to AMD APM Vol 2 Section 15.14.4 Pause + * Intercept Filtering for more details. + * This also indicate if ple logic enabled. + * + * pause_filter_count: In addition, some processor families support advanced + * pause filtering (indicated by CPUID Fn8000_000A_EDX) upper bound on + * the amount of time a guest is allowed to execute in a pause loop. + * In this mode, a 16-bit pause filter threshold field is added in the + * VMCB. The threshold value is a cycle count that is used to reset the + * pause counter. As with simple pause filtering, VMRUN loads the pause + * count value from VMCB into an internal counter. Then, on each pause + * instruction the hardware checks the elapsed number of cycles since + * the most recent pause instruction against the pause filter threshold. + * If the elapsed cycle count is greater than the pause filter threshold, + * then the internal pause count is reloaded from the VMCB and execution + * continues. If the elapsed cycle count is less than the pause filter + * threshold, then the internal pause count is decremented. If the count + * value is less than zero and PAUSE intercept is enabled, a #VMEXIT is + * triggered. If advanced pause filtering is supported and pause filter + * threshold field is set to zero, the filter will operate in the simpler, + * count only mode. + */ + +static int pause_filter_thresh = KVM_DEFAULT_PLE_GAP; +module_param(pause_filter_thresh, int, S_IRUGO); + +static int pause_filter_count = KVM_DEFAULT_PLE_WINDOW; +module_param(pause_filter_count, int, S_IRUGO); + +/* Default doubles per-vcpu window every exit. */ +static int ple_window_grow = KVM_DEFAULT_PLE_WINDOW_GROW; +module_param(ple_window_grow, int, S_IRUGO); + +/* Default resets per-vcpu window every exit to ple_window. */ +static int ple_window_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK; +module_param(ple_window_shrink, int, S_IRUGO); + +/* Default is to compute the maximum so we can never overflow. */ +static int ple_window_actual_max = KVM_SVM_DEFAULT_PLE_WINDOW_MAX; +static int ple_window_max = KVM_SVM_DEFAULT_PLE_WINDOW_MAX; +module_param(ple_window_max, int, S_IRUGO); + /* allow nested paging (virtualized MMU) for all guests */ static int npt = true; module_param(npt, int, S_IRUGO); @@ -1046,6 +1095,58 @@ static int avic_ga_log_notifier(u32 ga_tag) return 0; } +static void grow_ple_window(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + struct vmcb_control_area *control = &svm->vmcb->control; + int old = control->pause_filter_count; + + control->pause_filter_count = __grow_ple_window(old, + pause_filter_count, + ple_window_grow, + ple_window_actual_max); + + if (control->pause_filter_count != old) + mark_dirty(svm->vmcb, VMCB_INTERCEPTS); + + trace_kvm_ple_window_grow(vcpu->vcpu_id, + control->pause_filter_count, old); +} + +static void shrink_ple_window(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + struct vmcb_control_area *control = &svm->vmcb->control; + int old = control->pause_filter_count; + + control->pause_filter_count = __shrink_ple_window(old, + pause_filter_count, + ple_window_shrink, + pause_filter_count); + + if (control->pause_filter_count != old) + mark_dirty(svm->vmcb, VMCB_INTERCEPTS); + + trace_kvm_ple_window_shrink(vcpu->vcpu_id, + control->pause_filter_count, old); +} + +/* + * ple_window_actual_max is computed to be one grow_ple_window() below + * ple_window_max. (See __grow_ple_window for the reason.) + * This prevents overflows, because ple_window_max is int. + * ple_window_max effectively rounded down to a multiple of ple_window_grow in + * this process. + * ple_window_max is also prevented from setting control->pause_filter_count < + * pause_filter_count. + */ +static void update_ple_window_actual_max(void) +{ + ple_window_actual_max = + __shrink_ple_window(max(ple_window_max, pause_filter_count), + pause_filter_count, + ple_window_grow, SHRT_MIN); +} static __init int svm_hardware_setup(void) { int cpu; @@ -1101,6 +1202,8 @@ static __init int svm_hardware_setup(void) } else kvm_disable_tdp(); + update_ple_window_actual_max(); + if (avic) { if (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC) || @@ -1309,7 +1412,11 @@ static void init_vmcb(struct vcpu_svm *svm) svm->vcpu.arch.hflags = 0; if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) { - control->pause_filter_count = 3000; + control->pause_filter_count = pause_filter_count; + if (boot_cpu_has(X86_FEATURE_PFTHRESHOLD)) + control->pause_filter_thresh = pause_filter_thresh; + else + pause_filter_thresh = 0; set_intercept(svm, INTERCEPT_PAUSE); } @@ -3802,6 +3909,9 @@ static int pause_interception(struct vcpu_svm *svm) struct kvm_vcpu *vcpu = &svm->vcpu; bool in_kernel = (svm_get_cpl(vcpu) == 0); + if (pause_filter_thresh) + grow_ple_window(vcpu); + kvm_vcpu_on_spin(vcpu, in_kernel); return 1; } @@ -5424,6 +5534,8 @@ static void svm_handle_external_intr(struct kvm_vcpu *vcpu) static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu) { + if (pause_filter_thresh) + shrink_ple_window(vcpu); } static inline void avic_post_state_restore(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index d1fb7bb..4c4f6b8 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -15,6 +15,7 @@ #define KVM_DEFAULT_PLE_WINDOW_SHRINK 0 #define KVM_VMX_DEFAULT_PLE_WINDOW_MAX \ (INT_MAX / KVM_DEFAULT_PLE_WINDOW_GROW) +#define KVM_SVM_DEFAULT_PLE_WINDOW_MAX USHRT_MAX static inline int __grow_ple_window(int val, int base, int modifier, int max) {