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 "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_io(&s->base_io, OBJECT(dev), NULL, NULL, "kvm-pic", 2);
 125     memory_region_init_io(&s->elcr_io, OBJECT(dev), NULL, 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     device_class_set_parent_realize(dc, kvm_pic_realize, &kpc->parent_realize);
 146     k->pre_save   = kvm_pic_get;
 147     k->post_load  = kvm_pic_put;
 148 }
 149
 150 static const TypeInfo kvm_i8259_info = {
 151     .name = TYPE_KVM_I8259,
 152     .parent = TYPE_PIC_COMMON,
 153     .instance_size = sizeof(PICCommonState),
 154     .class_init = kvm_i8259_class_init,
 155     .class_size = sizeof(KVMPICClass),
 156 };
 157
 158 static void kvm_pic_register_types(void)
 159 {
 160     type_register_static(&kvm_i8259_info);
 161 }
 162
 163 type_init(kvm_pic_register_types)