qemu/hw/i386/kvm/i8259.c

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