hw/kvm/ioapic.c

   1 /*
   2  * KVM in-kernel IOPIC 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 "hw/pc.h"
  14 #include "hw/ioapic_internal.h"
  15 #include "hw/apic_internal.h"
  16 #include "kvm.h"
  17
  18 typedef struct KVMIOAPICState KVMIOAPICState;
  19
  20 struct KVMIOAPICState {
  21     IOAPICCommonState ioapic;
  22     uint32_t kvm_gsi_base;
  23 };
  24
  25 static void kvm_ioapic_get(IOAPICCommonState *s)
  26 {
  27     struct kvm_irqchip chip;
  28     struct kvm_ioapic_state *kioapic;
  29     int ret, i;
  30
  31     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  32     ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
  33     if (ret < 0) {
  34         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  35         abort();
  36     }
  37
  38     kioapic = &chip.chip.ioapic;
  39
  40     s->id = kioapic->id;
  41     s->ioregsel = kioapic->ioregsel;
  42     s->irr = kioapic->irr;
  43     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  44         s->ioredtbl[i] = kioapic->redirtbl[i].bits;
  45     }
  46 }
  47
  48 static void kvm_ioapic_put(IOAPICCommonState *s)
  49 {
  50     struct kvm_irqchip chip;
  51     struct kvm_ioapic_state *kioapic;
  52     int ret, i;
  53
  54     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  55     kioapic = &chip.chip.ioapic;
  56
  57     kioapic->id = s->id;
  58     kioapic->ioregsel = s->ioregsel;
  59     kioapic->base_address = s->busdev.mmio[0].addr;
  60     kioapic->irr = s->irr;
  61     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  62         kioapic->redirtbl[i].bits = s->ioredtbl[i];
  63     }
  64
  65     ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
  66     if (ret < 0) {
  67         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  68         abort();
  69     }
  70 }
  71
  72 static void kvm_ioapic_reset(DeviceState *dev)
  73 {
  74     IOAPICCommonState *s = DO_UPCAST(IOAPICCommonState, busdev.qdev, dev);
  75
  76     ioapic_reset_common(dev);
  77     kvm_ioapic_put(s);
  78 }
  79
  80 static void kvm_ioapic_set_irq(void *opaque, int irq, int level)
  81 {
  82     KVMIOAPICState *s = opaque;
  83     int delivered;
  84
  85     delivered = kvm_irqchip_set_irq(kvm_state, s->kvm_gsi_base + irq, level);
  86     apic_report_irq_delivered(delivered);
  87 }
  88
  89 static void kvm_ioapic_init(IOAPICCommonState *s, int instance_no)
  90 {
  91     memory_region_init_reservation(&s->io_memory, "kvm-ioapic", 0x1000);
  92
  93     qdev_init_gpio_in(&s->busdev.qdev, kvm_ioapic_set_irq, IOAPIC_NUM_PINS);
  94 }
  95
  96 static void kvm_ioapic_class_init(ObjectClass *klass, void *data)
  97 {
  98     IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
  99
 100     k->init      = kvm_ioapic_init;
 101     k->pre_save  = kvm_ioapic_get;
 102     k->post_load = kvm_ioapic_put;
 103 }
 104
 105 static DeviceInfo kvm_ioapic_info = {
 106     .name  = "kvm-ioapic",
 107     .size = sizeof(KVMIOAPICState),
 108     .reset = kvm_ioapic_reset,
 109     .class_init = kvm_ioapic_class_init,
 110     .props = (Property[]) {
 111         DEFINE_PROP_UINT32("gsi_base", KVMIOAPICState, kvm_gsi_base, 0),
 112         DEFINE_PROP_END_OF_LIST()
 113     },
 114 };
 115
 116 static void kvm_ioapic_register_device(void)
 117 {
 118     ioapic_qdev_register(&kvm_ioapic_info);
 119 }
 120
 121 device_init(kvm_ioapic_register_device)