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