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
  18 static void kvm_pic_get(PICCommonState *s)
  19 {
  20     struct kvm_irqchip chip;
  21     struct kvm_pic_state *kpic;
  22     int ret;
  23
  24     chip.chip_id = s->master ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE;
  25     ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
  26     if (ret < 0) {
  27         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  28         abort();
  29     }
  30
  31     kpic = &chip.chip.pic;
  32
  33     s->last_irr = kpic->last_irr;
  34     s->irr = kpic->irr;
  35     s->imr = kpic->imr;
  36     s->isr = kpic->isr;
  37     s->priority_add = kpic->priority_add;
  38     s->irq_base = kpic->irq_base;
  39     s->read_reg_select = kpic->read_reg_select;
  40     s->poll = kpic->poll;
  41     s->special_mask = kpic->special_mask;
  42     s->init_state = kpic->init_state;
  43     s->auto_eoi = kpic->auto_eoi;
  44     s->rotate_on_auto_eoi = kpic->rotate_on_auto_eoi;
  45     s->special_fully_nested_mode = kpic->special_fully_nested_mode;
  46     s->init4 = kpic->init4;
  47     s->elcr = kpic->elcr;
  48     s->elcr_mask = kpic->elcr_mask;
  49 }
  50
  51 static void kvm_pic_put(PICCommonState *s)
  52 {
  53     struct kvm_irqchip chip;
  54     struct kvm_pic_state *kpic;
  55     int ret;
  56
  57     chip.chip_id = s->master ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE;
  58
  59     kpic = &chip.chip.pic;
  60
  61     kpic->last_irr = s->last_irr;
  62     kpic->irr = s->irr;
  63     kpic->imr = s->imr;
  64     kpic->isr = s->isr;
  65     kpic->priority_add = s->priority_add;
  66     kpic->irq_base = s->irq_base;
  67     kpic->read_reg_select = s->read_reg_select;
  68     kpic->poll = s->poll;
  69     kpic->special_mask = s->special_mask;
  70     kpic->init_state = s->init_state;
  71     kpic->auto_eoi = s->auto_eoi;
  72     kpic->rotate_on_auto_eoi = s->rotate_on_auto_eoi;
  73     kpic->special_fully_nested_mode = s->special_fully_nested_mode;
  74     kpic->init4 = s->init4;
  75     kpic->elcr = s->elcr;
  76     kpic->elcr_mask = s->elcr_mask;
  77
  78     ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
  79     if (ret < 0) {
  80         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  81         abort();
  82     }
  83 }
  84
  85 static void kvm_pic_reset(DeviceState *dev)
  86 {
  87     PICCommonState *s = PIC_COMMON(dev);
  88
  89     s->elcr = 0;
  90     pic_reset_common(s);
  91
  92     kvm_pic_put(s);
  93 }
  94
  95 static void kvm_pic_set_irq(void *opaque, int irq, int level)
  96 {
  97     int delivered;
  98
  99     delivered = kvm_set_irq(kvm_state, irq, level);
 100     apic_report_irq_delivered(delivered);
 101 }
 102
 103 static void kvm_pic_init(PICCommonState *s)
 104 {
 105     memory_region_init_reservation(&s->base_io, "kvm-pic", 2);
 106     memory_region_init_reservation(&s->elcr_io, "kvm-elcr", 1);
 107 }
 108
 109 qemu_irq *kvm_i8259_init(ISABus *bus)
 110 {
 111     i8259_init_chip(TYPE_KVM_I8259, bus, true);
 112     i8259_init_chip(TYPE_KVM_I8259, bus, false);
 113
 114     return qemu_allocate_irqs(kvm_pic_set_irq, NULL, ISA_NUM_IRQS);
 115 }
 116
 117 static void kvm_i8259_class_init(ObjectClass *klass, void *data)
 118 {
 119     PICCommonClass *k = PIC_COMMON_CLASS(klass);
 120     DeviceClass *dc = DEVICE_CLASS(klass);
 121
 122     dc->reset     = kvm_pic_reset;
 123     k->init       = kvm_pic_init;
 124     k->pre_save   = kvm_pic_get;
 125     k->post_load  = kvm_pic_put;
 126 }
 127
 128 static const TypeInfo kvm_i8259_info = {
 129     .name = TYPE_KVM_I8259,
 130     .parent = TYPE_PIC_COMMON,
 131     .instance_size = sizeof(PICCommonState),
 132     .class_init = kvm_i8259_class_init,
 133 };
 134
 135 static void kvm_pic_register_types(void)
 136 {
 137     type_register_static(&kvm_i8259_info);
 138 }
 139
 140 type_init(kvm_pic_register_types)