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 /* PC Utility function */
  19 void kvm_pc_setup_irq_routing(bool pci_enabled)
  20 {
  21     KVMState *s = kvm_state;
  22     int i;
  23
  24     if (kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
  25         for (i = 0; i < 8; ++i) {
  26             if (i == 2) {
  27                 continue;
  28             }
  29             kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_PIC_MASTER, i);
  30         }
  31         for (i = 8; i < 16; ++i) {
  32             kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_PIC_SLAVE, i - 8);
  33         }
  34         if (pci_enabled) {
  35             for (i = 0; i < 24; ++i) {
  36                 if (i == 0) {
  37                     kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_IOAPIC, 2);
  38                 } else if (i != 2) {
  39                     kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_IOAPIC, i);
  40                 }
  41             }
  42         }
  43     }
  44 }
  45
  46 void kvm_pc_gsi_handler(void *opaque, int n, int level)
  47 {
  48     GSIState *s = opaque;
  49
  50     if (n < ISA_NUM_IRQS) {
  51         /* Kernel will forward to both PIC and IOAPIC */
  52         qemu_set_irq(s->i8259_irq[n], level);
  53     } else {
  54         qemu_set_irq(s->ioapic_irq[n], level);
  55     }
  56 }
  57
  58 typedef struct KVMIOAPICState KVMIOAPICState;
  59
  60 struct KVMIOAPICState {
  61     IOAPICCommonState ioapic;
  62     uint32_t kvm_gsi_base;
  63 };
  64
  65 static void kvm_ioapic_get(IOAPICCommonState *s)
  66 {
  67     struct kvm_irqchip chip;
  68     struct kvm_ioapic_state *kioapic;
  69     int ret, i;
  70
  71     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  72     ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
  73     if (ret < 0) {
  74         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  75         abort();
  76     }
  77
  78     kioapic = &chip.chip.ioapic;
  79
  80     s->id = kioapic->id;
  81     s->ioregsel = kioapic->ioregsel;
  82     s->irr = kioapic->irr;
  83     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  84         s->ioredtbl[i] = kioapic->redirtbl[i].bits;
  85     }
  86 }
  87
  88 static void kvm_ioapic_put(IOAPICCommonState *s)
  89 {
  90     struct kvm_irqchip chip;
  91     struct kvm_ioapic_state *kioapic;
  92     int ret, i;
  93
  94     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  95     kioapic = &chip.chip.ioapic;
  96
  97     kioapic->id = s->id;
  98     kioapic->ioregsel = s->ioregsel;
  99     kioapic->base_address = s->busdev.mmio[0].addr;
 100     kioapic->irr = s->irr;
 101     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 102         kioapic->redirtbl[i].bits = s->ioredtbl[i];
 103     }
 104
 105     ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
 106     if (ret < 0) {
 107         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
 108         abort();
 109     }
 110 }
 111
 112 static void kvm_ioapic_reset(DeviceState *dev)
 113 {
 114     IOAPICCommonState *s = DO_UPCAST(IOAPICCommonState, busdev.qdev, dev);
 115
 116     ioapic_reset_common(dev);
 117     kvm_ioapic_put(s);
 118 }
 119
 120 static void kvm_ioapic_set_irq(void *opaque, int irq, int level)
 121 {
 122     KVMIOAPICState *s = opaque;
 123     int delivered;
 124
 125     delivered = kvm_set_irq(kvm_state, s->kvm_gsi_base + irq, level);
 126     apic_report_irq_delivered(delivered);
 127 }
 128
 129 static void kvm_ioapic_init(IOAPICCommonState *s, int instance_no)
 130 {
 131     memory_region_init_reservation(&s->io_memory, "kvm-ioapic", 0x1000);
 132
 133     qdev_init_gpio_in(&s->busdev.qdev, kvm_ioapic_set_irq, IOAPIC_NUM_PINS);
 134 }
 135
 136 static Property kvm_ioapic_properties[] = {
 137     DEFINE_PROP_UINT32("gsi_base", KVMIOAPICState, kvm_gsi_base, 0),
 138     DEFINE_PROP_END_OF_LIST()
 139 };
 140
 141 static void kvm_ioapic_class_init(ObjectClass *klass, void *data)
 142 {
 143     IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
 144     DeviceClass *dc = DEVICE_CLASS(klass);
 145
 146     k->init      = kvm_ioapic_init;
 147     k->pre_save  = kvm_ioapic_get;
 148     k->post_load = kvm_ioapic_put;
 149     dc->reset    = kvm_ioapic_reset;
 150     dc->props    = kvm_ioapic_properties;
 151 }
 152
 153 static TypeInfo kvm_ioapic_info = {
 154     .name  = "kvm-ioapic",
 155     .parent = TYPE_IOAPIC_COMMON,
 156     .instance_size = sizeof(KVMIOAPICState),
 157     .class_init = kvm_ioapic_class_init,
 158 };
 159
 160 static void kvm_ioapic_register_types(void)
 161 {
 162     type_register_static(&kvm_ioapic_info);
 163 }
 164
 165 type_init(kvm_ioapic_register_types)