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KVM: X86: Provide a capability to disable PAUSE intercepts
Allow to disable pause loop exit/pause filtering on a per VM basis. If some VMs have dedicated host CPUs, they won't be negatively affected due to needlessly intercepted PAUSE instructions. Thanks to Jan H. Schönherr's initial patch. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Jan H. Schönherr <jschoenh@amazon.de> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -813,6 +813,7 @@ struct kvm_arch {
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bool mwait_in_guest;
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bool hlt_in_guest;
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bool pause_in_guest;
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bool ept_identity_pagetable_done;
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gpa_t ept_identity_map_addr;
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@ -1460,7 +1460,8 @@ static void init_vmcb(struct vcpu_svm *svm)
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svm->nested.vmcb = 0;
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svm->vcpu.arch.hflags = 0;
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if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
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if (boot_cpu_has(X86_FEATURE_PAUSEFILTER) &&
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!kvm_pause_in_guest(svm->vcpu.kvm)) {
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control->pause_filter_count = 3000;
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set_intercept(svm, INTERCEPT_PAUSE);
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}
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@ -5595,7 +5595,7 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
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}
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if (!enable_unrestricted_guest)
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exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
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if (!ple_gap)
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if (kvm_pause_in_guest(vmx->vcpu.kvm))
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exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
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if (!kvm_vcpu_apicv_active(vcpu))
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exec_control &= ~(SECONDARY_EXEC_APIC_REGISTER_VIRT |
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@ -5758,7 +5758,7 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
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vmcs_write64(POSTED_INTR_DESC_ADDR, __pa((&vmx->pi_desc)));
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}
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if (ple_gap) {
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if (!kvm_pause_in_guest(vmx->vcpu.kvm)) {
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vmcs_write32(PLE_GAP, ple_gap);
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vmx->ple_window = ple_window;
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vmx->ple_window_dirty = true;
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@ -7207,7 +7207,7 @@ static __exit void hardware_unsetup(void)
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*/
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static int handle_pause(struct kvm_vcpu *vcpu)
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{
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if (ple_gap)
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if (!kvm_pause_in_guest(vcpu->kvm))
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grow_ple_window(vcpu);
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/*
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@ -9903,6 +9903,13 @@ free_vcpu:
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return ERR_PTR(err);
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}
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static int vmx_vm_init(struct kvm *kvm)
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{
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if (!ple_gap)
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kvm->arch.pause_in_guest = true;
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return 0;
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}
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static void __init vmx_check_processor_compat(void *rtn)
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{
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struct vmcs_config vmcs_conf;
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@ -12052,7 +12059,7 @@ static void vmx_cancel_hv_timer(struct kvm_vcpu *vcpu)
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static void vmx_sched_in(struct kvm_vcpu *vcpu, int cpu)
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{
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if (ple_gap)
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if (!kvm_pause_in_guest(vcpu->kvm))
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shrink_ple_window(vcpu);
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}
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@ -12412,6 +12419,8 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
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.cpu_has_accelerated_tpr = report_flexpriority,
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.cpu_has_high_real_mode_segbase = vmx_has_high_real_mode_segbase,
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.vm_init = vmx_vm_init,
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.vcpu_create = vmx_create_vcpu,
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.vcpu_free = vmx_free_vcpu,
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.vcpu_reset = vmx_vcpu_reset,
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@ -2878,7 +2878,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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r = KVM_CLOCK_TSC_STABLE;
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break;
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case KVM_CAP_X86_DISABLE_EXITS:
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r |= KVM_X86_DISABLE_EXITS_HTL;
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r |= KVM_X86_DISABLE_EXITS_HTL | KVM_X86_DISABLE_EXITS_PAUSE;
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if(kvm_can_mwait_in_guest())
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r |= KVM_X86_DISABLE_EXITS_MWAIT;
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break;
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@ -4235,6 +4235,8 @@ split_irqchip_unlock:
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kvm->arch.mwait_in_guest = true;
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if (cap->args[0] & KVM_X86_DISABLE_EXITS_HTL)
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kvm->arch.hlt_in_guest = true;
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if (cap->args[0] & KVM_X86_DISABLE_EXITS_PAUSE)
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kvm->arch.pause_in_guest = true;
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r = 0;
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break;
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default:
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@ -266,8 +266,10 @@ static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
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#define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0)
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#define KVM_X86_DISABLE_EXITS_HTL (1 << 1)
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#define KVM_X86_DISABLE_EXITS_PAUSE (1 << 2)
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#define KVM_X86_DISABLE_VALID_EXITS (KVM_X86_DISABLE_EXITS_MWAIT | \
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KVM_X86_DISABLE_EXITS_HTL)
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KVM_X86_DISABLE_EXITS_HTL | \
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KVM_X86_DISABLE_EXITS_PAUSE)
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static inline bool kvm_mwait_in_guest(struct kvm *kvm)
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{
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@ -279,4 +281,9 @@ static inline bool kvm_hlt_in_guest(struct kvm *kvm)
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return kvm->arch.hlt_in_guest;
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}
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static inline bool kvm_pause_in_guest(struct kvm *kvm)
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{
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return kvm->arch.pause_in_guest;
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}
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#endif
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