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KVM: x86: Remove return code from enable_irq/nmi_window
It's no longer possible to enter enable_irq_window in guest mode when L1 intercepts external interrupts and we are entering L2. This is now caught in vcpu_enter_guest. So we can remove the check from the VMX version of enable_irq_window, thus the need to return an error code from both enable_irq_window and enable_nmi_window. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -729,8 +729,8 @@ struct kvm_x86_ops {
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int (*nmi_allowed)(struct kvm_vcpu *vcpu);
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bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
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void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
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int (*enable_nmi_window)(struct kvm_vcpu *vcpu);
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int (*enable_irq_window)(struct kvm_vcpu *vcpu);
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void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
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void (*enable_irq_window)(struct kvm_vcpu *vcpu);
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void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
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int (*vm_has_apicv)(struct kvm *kvm);
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void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
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@ -3650,7 +3650,7 @@ static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
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return ret;
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}
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static int enable_irq_window(struct kvm_vcpu *vcpu)
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static void enable_irq_window(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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@ -3664,16 +3664,15 @@ static int enable_irq_window(struct kvm_vcpu *vcpu)
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svm_set_vintr(svm);
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svm_inject_irq(svm, 0x0);
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}
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return 0;
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}
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static int enable_nmi_window(struct kvm_vcpu *vcpu)
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static void enable_nmi_window(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
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== HF_NMI_MASK)
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return 0; /* IRET will cause a vm exit */
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return; /* IRET will cause a vm exit */
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/*
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* Something prevents NMI from been injected. Single step over possible
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@ -3682,7 +3681,6 @@ static int enable_nmi_window(struct kvm_vcpu *vcpu)
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svm->nmi_singlestep = true;
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svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
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update_db_bp_intercept(vcpu);
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return 0;
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}
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static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
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@ -4514,39 +4514,28 @@ static bool nested_exit_on_nmi(struct kvm_vcpu *vcpu)
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PIN_BASED_NMI_EXITING;
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}
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static int enable_irq_window(struct kvm_vcpu *vcpu)
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static void enable_irq_window(struct kvm_vcpu *vcpu)
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{
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u32 cpu_based_vm_exec_control;
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if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
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/*
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* We get here if vmx_interrupt_allowed() said we can't
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* inject to L1 now because L2 must run. The caller will have
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* to make L2 exit right after entry, so we can inject to L1
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* more promptly.
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*/
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return -EBUSY;
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cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
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cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
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vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
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return 0;
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}
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static int enable_nmi_window(struct kvm_vcpu *vcpu)
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static void enable_nmi_window(struct kvm_vcpu *vcpu)
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{
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u32 cpu_based_vm_exec_control;
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if (!cpu_has_virtual_nmis())
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return enable_irq_window(vcpu);
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if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI)
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return enable_irq_window(vcpu);
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if (!cpu_has_virtual_nmis() ||
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vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
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enable_irq_window(vcpu);
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return;
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}
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cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
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cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
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vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
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return 0;
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}
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static void vmx_inject_irq(struct kvm_vcpu *vcpu)
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@ -5976,11 +5976,9 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
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req_immediate_exit = true;
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/* enable NMI/IRQ window open exits if needed */
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else if (vcpu->arch.nmi_pending)
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req_immediate_exit =
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kvm_x86_ops->enable_nmi_window(vcpu) != 0;
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kvm_x86_ops->enable_nmi_window(vcpu);
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else if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win)
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req_immediate_exit =
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kvm_x86_ops->enable_irq_window(vcpu) != 0;
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kvm_x86_ops->enable_irq_window(vcpu);
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if (kvm_lapic_enabled(vcpu)) {
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/*
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