1 /* 2 * irq.c: API for in kernel interrupt controller 3 * Copyright (c) 2007, Intel Corporation. 4 * Copyright 2009 Red Hat, Inc. and/or its affiliates. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 17 * Place - Suite 330, Boston, MA 02111-1307 USA. 18 * Authors: 19 * Yaozu (Eddie) Dong <Eddie.dong@intel.com> 20 * 21 */ 22 23 #include <linux/export.h> 24 #include <linux/kvm_host.h> 25 26 #include "irq.h" 27 #include "i8254.h" 28 #include "x86.h" 29 30 /* 31 * check if there are pending timer events 32 * to be processed. 33 */ 34 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 35 { 36 if (lapic_in_kernel(vcpu)) 37 return apic_has_pending_timer(vcpu); 38 39 return 0; 40 } 41 EXPORT_SYMBOL(kvm_cpu_has_pending_timer); 42 43 /* 44 * check if there is a pending userspace external interrupt 45 */ 46 static int pending_userspace_extint(struct kvm_vcpu *v) 47 { 48 return v->arch.pending_external_vector != -1; 49 } 50 51 /* 52 * check if there is pending interrupt from 53 * non-APIC source without intack. 54 */ 55 static int kvm_cpu_has_extint(struct kvm_vcpu *v) 56 { 57 u8 accept = kvm_apic_accept_pic_intr(v); 58 59 if (accept) { 60 if (irqchip_split(v->kvm)) 61 return pending_userspace_extint(v); 62 else 63 return pic_irqchip(v->kvm)->output; 64 } else 65 return 0; 66 } 67 68 /* 69 * check if there is injectable interrupt: 70 * when virtual interrupt delivery enabled, 71 * interrupt from apic will handled by hardware, 72 * we don't need to check it here. 73 */ 74 int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v) 75 { 76 if (!lapic_in_kernel(v)) 77 return v->arch.interrupt.pending; 78 79 if (kvm_cpu_has_extint(v)) 80 return 1; 81 82 if (kvm_vcpu_apicv_active(v)) 83 return 0; 84 85 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */ 86 } 87 88 /* 89 * check if there is pending interrupt without 90 * intack. 91 */ 92 int kvm_cpu_has_interrupt(struct kvm_vcpu *v) 93 { 94 if (!lapic_in_kernel(v)) 95 return v->arch.interrupt.pending; 96 97 if (kvm_cpu_has_extint(v)) 98 return 1; 99 100 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */ 101 } 102 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt); 103 104 /* 105 * Read pending interrupt(from non-APIC source) 106 * vector and intack. 107 */ 108 static int kvm_cpu_get_extint(struct kvm_vcpu *v) 109 { 110 if (kvm_cpu_has_extint(v)) { 111 if (irqchip_split(v->kvm)) { 112 int vector = v->arch.pending_external_vector; 113 114 v->arch.pending_external_vector = -1; 115 return vector; 116 } else 117 return kvm_pic_read_irq(v->kvm); /* PIC */ 118 } else 119 return -1; 120 } 121 122 /* 123 * Read pending interrupt vector and intack. 124 */ 125 int kvm_cpu_get_interrupt(struct kvm_vcpu *v) 126 { 127 int vector; 128 129 if (!lapic_in_kernel(v)) 130 return v->arch.interrupt.nr; 131 132 vector = kvm_cpu_get_extint(v); 133 134 if (vector != -1) 135 return vector; /* PIC */ 136 137 return kvm_get_apic_interrupt(v); /* APIC */ 138 } 139 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt); 140 141 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu) 142 { 143 if (lapic_in_kernel(vcpu)) 144 kvm_inject_apic_timer_irqs(vcpu); 145 } 146 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs); 147 148 void __kvm_migrate_timers(struct kvm_vcpu *vcpu) 149 { 150 __kvm_migrate_apic_timer(vcpu); 151 __kvm_migrate_pit_timer(vcpu); 152 } 153