hw/i386/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/i386/pc.h"
  14 #include "hw/i386/ioapic_internal.h"
  15 #include "hw/i386/apic_internal.h"
  16 #include "sysemu/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         kvm_irqchip_commit_routes(s);
  44     }
  45 }
  46
  47 void kvm_pc_gsi_handler(void *opaque, int n, int level)
  48 {
  49     GSIState *s = opaque;
  50
  51     if (n < ISA_NUM_IRQS) {
  52         /* Kernel will forward to both PIC and IOAPIC */
  53         qemu_set_irq(s->i8259_irq[n], level);
  54     } else {
  55         qemu_set_irq(s->ioapic_irq[n], level);
  56     }
  57 }
  58
  59 typedef struct KVMIOAPICState KVMIOAPICState;
  60
  61 struct KVMIOAPICState {
  62     IOAPICCommonState ioapic;
  63     uint32_t kvm_gsi_base;
  64 };
  65
  66 static void kvm_ioapic_get(IOAPICCommonState *s)
  67 {
  68     struct kvm_irqchip chip;
  69     struct kvm_ioapic_state *kioapic;
  70     int ret, i;
  71
  72     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  73     ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
  74     if (ret < 0) {
  75         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  76         abort();
  77     }
  78
  79     kioapic = &chip.chip.ioapic;
  80
  81     s->id = kioapic->id;
  82     s->ioregsel = kioapic->ioregsel;
  83     s->irr = kioapic->irr;
  84     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  85         s->ioredtbl[i] = kioapic->redirtbl[i].bits;
  86     }
  87 }
  88
  89 static void kvm_ioapic_put(IOAPICCommonState *s)
  90 {
  91     struct kvm_irqchip chip;
  92     struct kvm_ioapic_state *kioapic;
  93     int ret, i;
  94
  95     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  96     kioapic = &chip.chip.ioapic;
  97
  98     kioapic->id = s->id;
  99     kioapic->ioregsel = s->ioregsel;
 100     kioapic->base_address = s->busdev.mmio[0].addr;
 101     kioapic->irr = s->irr;
 102     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 103         kioapic->redirtbl[i].bits = s->ioredtbl[i];
 104     }
 105
 106     ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
 107     if (ret < 0) {
 108         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
 109         abort();
 110     }
 111 }
 112
 113 static void kvm_ioapic_reset(DeviceState *dev)
 114 {
 115     IOAPICCommonState *s = DO_UPCAST(IOAPICCommonState, busdev.qdev, dev);
 116
 117     ioapic_reset_common(dev);
 118     kvm_ioapic_put(s);
 119 }
 120
 121 static void kvm_ioapic_set_irq(void *opaque, int irq, int level)
 122 {
 123     KVMIOAPICState *s = opaque;
 124     int delivered;
 125
 126     delivered = kvm_set_irq(kvm_state, s->kvm_gsi_base + irq, level);
 127     apic_report_irq_delivered(delivered);
 128 }
 129
 130 static void kvm_ioapic_init(IOAPICCommonState *s, int instance_no)
 131 {
 132     memory_region_init_reservation(&s->io_memory, "kvm-ioapic", 0x1000);
 133
 134     qdev_init_gpio_in(&s->busdev.qdev, kvm_ioapic_set_irq, IOAPIC_NUM_PINS);
 135 }
 136
 137 static Property kvm_ioapic_properties[] = {
 138     DEFINE_PROP_UINT32("gsi_base", KVMIOAPICState, kvm_gsi_base, 0),
 139     DEFINE_PROP_END_OF_LIST()
 140 };
 141
 142 static void kvm_ioapic_class_init(ObjectClass *klass, void *data)
 143 {
 144     IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
 145     DeviceClass *dc = DEVICE_CLASS(klass);
 146
 147     k->init      = kvm_ioapic_init;
 148     k->pre_save  = kvm_ioapic_get;
 149     k->post_load = kvm_ioapic_put;
 150     dc->reset    = kvm_ioapic_reset;
 151     dc->props    = kvm_ioapic_properties;
 152 }
 153
 154 static const TypeInfo kvm_ioapic_info = {
 155     .name  = "kvm-ioapic",
 156     .parent = TYPE_IOAPIC_COMMON,
 157     .instance_size = sizeof(KVMIOAPICState),
 158     .class_init = kvm_ioapic_class_init,
 159 };
 160
 161 static void kvm_ioapic_register_types(void)
 162 {
 163     type_register_static(&kvm_ioapic_info);
 164 }
 165
 166 type_init(kvm_ioapic_register_types)