1 /* 2 * KVM in-kernel PIC (i8259) support 3 * 4 * Copyright (c) 2011 Siemens AG 5 * 6 * Authors: 7 * Jan Kiszka <jan.kiszka@siemens.com> 8 * 9 * This work is licensed under the terms of the GNU GPL version 2. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "hw/isa/i8259_internal.h" 15 #include "qemu/module.h" 16 #include "hw/i386/apic_internal.h" 17 #include "hw/irq.h" 18 #include "sysemu/kvm.h" 19 20 #define TYPE_KVM_I8259 "kvm-i8259" 21 #define KVM_PIC_CLASS(class) \ 22 OBJECT_CLASS_CHECK(KVMPICClass, (class), TYPE_KVM_I8259) 23 #define KVM_PIC_GET_CLASS(obj) \ 24 OBJECT_GET_CLASS(KVMPICClass, (obj), TYPE_KVM_I8259) 25 26 /** 27 * KVMPICClass: 28 * @parent_realize: The parent's realizefn. 29 */ 30 typedef struct KVMPICClass { 31 PICCommonClass parent_class; 32 33 DeviceRealize parent_realize; 34 } KVMPICClass; 35 36 static void kvm_pic_get(PICCommonState *s) 37 { 38 struct kvm_irqchip chip; 39 struct kvm_pic_state *kpic; 40 int ret; 41 42 chip.chip_id = s->master ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE; 43 ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip); 44 if (ret < 0) { 45 fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret)); 46 abort(); 47 } 48 49 kpic = &chip.chip.pic; 50 51 s->last_irr = kpic->last_irr; 52 s->irr = kpic->irr; 53 s->imr = kpic->imr; 54 s->isr = kpic->isr; 55 s->priority_add = kpic->priority_add; 56 s->irq_base = kpic->irq_base; 57 s->read_reg_select = kpic->read_reg_select; 58 s->poll = kpic->poll; 59 s->special_mask = kpic->special_mask; 60 s->init_state = kpic->init_state; 61 s->auto_eoi = kpic->auto_eoi; 62 s->rotate_on_auto_eoi = kpic->rotate_on_auto_eoi; 63 s->special_fully_nested_mode = kpic->special_fully_nested_mode; 64 s->init4 = kpic->init4; 65 s->elcr = kpic->elcr; 66 s->elcr_mask = kpic->elcr_mask; 67 } 68 69 static void kvm_pic_put(PICCommonState *s) 70 { 71 struct kvm_irqchip chip; 72 struct kvm_pic_state *kpic; 73 int ret; 74 75 chip.chip_id = s->master ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE; 76 77 kpic = &chip.chip.pic; 78 79 kpic->last_irr = s->last_irr; 80 kpic->irr = s->irr; 81 kpic->imr = s->imr; 82 kpic->isr = s->isr; 83 kpic->priority_add = s->priority_add; 84 kpic->irq_base = s->irq_base; 85 kpic->read_reg_select = s->read_reg_select; 86 kpic->poll = s->poll; 87 kpic->special_mask = s->special_mask; 88 kpic->init_state = s->init_state; 89 kpic->auto_eoi = s->auto_eoi; 90 kpic->rotate_on_auto_eoi = s->rotate_on_auto_eoi; 91 kpic->special_fully_nested_mode = s->special_fully_nested_mode; 92 kpic->init4 = s->init4; 93 kpic->elcr = s->elcr; 94 kpic->elcr_mask = s->elcr_mask; 95 96 ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip); 97 if (ret < 0) { 98 fprintf(stderr, "KVM_SET_IRQCHIP failed: %s\n", strerror(ret)); 99 abort(); 100 } 101 } 102 103 static void kvm_pic_reset(DeviceState *dev) 104 { 105 PICCommonState *s = PIC_COMMON(dev); 106 107 s->elcr = 0; 108 pic_reset_common(s); 109 110 kvm_pic_put(s); 111 } 112 113 static void kvm_pic_set_irq(void *opaque, int irq, int level) 114 { 115 int delivered; 116 117 pic_stat_update_irq(irq, level); 118 delivered = kvm_set_irq(kvm_state, irq, level); 119 apic_report_irq_delivered(delivered); 120 } 121 122 static void kvm_pic_realize(DeviceState *dev, Error **errp) 123 { 124 PICCommonState *s = PIC_COMMON(dev); 125 KVMPICClass *kpc = KVM_PIC_GET_CLASS(dev); 126 127 memory_region_init_io(&s->base_io, OBJECT(dev), NULL, NULL, "kvm-pic", 2); 128 memory_region_init_io(&s->elcr_io, OBJECT(dev), NULL, NULL, "kvm-elcr", 1); 129 130 kpc->parent_realize(dev, errp); 131 } 132 133 qemu_irq *kvm_i8259_init(ISABus *bus) 134 { 135 i8259_init_chip(TYPE_KVM_I8259, bus, true); 136 i8259_init_chip(TYPE_KVM_I8259, bus, false); 137 138 return qemu_allocate_irqs(kvm_pic_set_irq, NULL, ISA_NUM_IRQS); 139 } 140 141 static void kvm_i8259_class_init(ObjectClass *klass, void *data) 142 { 143 KVMPICClass *kpc = KVM_PIC_CLASS(klass); 144 PICCommonClass *k = PIC_COMMON_CLASS(klass); 145 DeviceClass *dc = DEVICE_CLASS(klass); 146 147 dc->reset = kvm_pic_reset; 148 device_class_set_parent_realize(dc, kvm_pic_realize, &kpc->parent_realize); 149 k->pre_save = kvm_pic_get; 150 k->post_load = kvm_pic_put; 151 } 152 153 static const TypeInfo kvm_i8259_info = { 154 .name = TYPE_KVM_I8259, 155 .parent = TYPE_PIC_COMMON, 156 .instance_size = sizeof(PICCommonState), 157 .class_init = kvm_i8259_class_init, 158 .class_size = sizeof(KVMPICClass), 159 }; 160 161 static void kvm_pic_register_types(void) 162 { 163 type_register_static(&kvm_i8259_info); 164 } 165 166 type_init(kvm_pic_register_types) 167