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