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