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 "qemu/osdep.h"
  14 #include "monitor/monitor.h"
  15 #include "hw/i386/pc.h"
  16 #include "hw/i386/ioapic_internal.h"
  17 #include "hw/i386/apic_internal.h"
  18 #include "sysemu/kvm.h"
  19
  20 /* PC Utility function */
  21 void kvm_pc_setup_irq_routing(bool pci_enabled)
  22 {
  23     KVMState *s = kvm_state;
  24     int i;
  25
  26     if (kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
  27         for (i = 0; i < 8; ++i) {
  28             if (i == 2) {
  29                 continue;
  30             }
  31             kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_PIC_MASTER, i);
  32         }
  33         for (i = 8; i < 16; ++i) {
  34             kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_PIC_SLAVE, i - 8);
  35         }
  36         if (pci_enabled) {
  37             for (i = 0; i < 24; ++i) {
  38                 if (i == 0) {
  39                     kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_IOAPIC, 2);
  40                 } else if (i != 2) {
  41                     kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_IOAPIC, i);
  42                 }
  43             }
  44         }
  45         kvm_irqchip_commit_routes(s);
  46     }
  47 }
  48
  49 void kvm_pc_gsi_handler(void *opaque, int n, int level)
  50 {
  51     GSIState *s = opaque;
  52
  53     if (n < ISA_NUM_IRQS) {
  54         /* Kernel will forward to both PIC and IOAPIC */
  55         qemu_set_irq(s->i8259_irq[n], level);
  56     } else {
  57         qemu_set_irq(s->ioapic_irq[n], level);
  58     }
  59 }
  60
  61 typedef struct KVMIOAPICState KVMIOAPICState;
  62
  63 struct KVMIOAPICState {
  64     IOAPICCommonState ioapic;
  65     uint32_t kvm_gsi_base;
  66 };
  67
  68 static void kvm_ioapic_get(IOAPICCommonState *s)
  69 {
  70     struct kvm_irqchip chip;
  71     struct kvm_ioapic_state *kioapic;
  72     int ret, i;
  73
  74     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  75     ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
  76     if (ret < 0) {
  77         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
  78         abort();
  79     }
  80
  81     kioapic = &chip.chip.ioapic;
  82
  83     s->id = kioapic->id;
  84     s->ioregsel = kioapic->ioregsel;
  85     s->irr = kioapic->irr;
  86     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  87         s->ioredtbl[i] = kioapic->redirtbl[i].bits;
  88     }
  89 }
  90
  91 static void kvm_ioapic_put(IOAPICCommonState *s)
  92 {
  93     struct kvm_irqchip chip;
  94     struct kvm_ioapic_state *kioapic;
  95     int ret, i;
  96
  97     chip.chip_id = KVM_IRQCHIP_IOAPIC;
  98     kioapic = &chip.chip.ioapic;
  99
 100     kioapic->id = s->id;
 101     kioapic->ioregsel = s->ioregsel;
 102     kioapic->base_address = s->busdev.mmio[0].addr;
 103     kioapic->irr = s->irr;
 104     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 105         kioapic->redirtbl[i].bits = s->ioredtbl[i];
 106     }
 107
 108     ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
 109     if (ret < 0) {
 110         fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
 111         abort();
 112     }
 113 }
 114
 115 static void kvm_ioapic_reset(DeviceState *dev)
 116 {
 117     IOAPICCommonState *s = IOAPIC_COMMON(dev);
 118
 119     ioapic_reset_common(dev);
 120     kvm_ioapic_put(s);
 121 }
 122
 123 static void kvm_ioapic_set_irq(void *opaque, int irq, int level)
 124 {
 125     KVMIOAPICState *s = opaque;
 126     IOAPICCommonState *common = IOAPIC_COMMON(s);
 127     int delivered;
 128
 129     ioapic_stat_update_irq(common, irq, level);
 130     delivered = kvm_set_irq(kvm_state, s->kvm_gsi_base + irq, level);
 131     apic_report_irq_delivered(delivered);
 132 }
 133
 134 static void kvm_ioapic_realize(DeviceState *dev, Error **errp)
 135 {
 136     IOAPICCommonState *s = IOAPIC_COMMON(dev);
 137
 138     memory_region_init_io(&s->io_memory, OBJECT(dev), NULL, NULL, "kvm-ioapic", 0x1000);
 139     /*
 140      * KVM ioapic only supports 0x11 now. This will only be used when
 141      * we want to dump ioapic version.
 142      */
 143     s->version = 0x11;
 144
 145     qdev_init_gpio_in(dev, kvm_ioapic_set_irq, IOAPIC_NUM_PINS);
 146 }
 147
 148 static Property kvm_ioapic_properties[] = {
 149     DEFINE_PROP_UINT32("gsi_base", KVMIOAPICState, kvm_gsi_base, 0),
 150     DEFINE_PROP_END_OF_LIST()
 151 };
 152
 153 static void kvm_ioapic_class_init(ObjectClass *klass, void *data)
 154 {
 155     IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
 156     DeviceClass *dc = DEVICE_CLASS(klass);
 157
 158     k->realize   = kvm_ioapic_realize;
 159     k->pre_save  = kvm_ioapic_get;
 160     k->post_load = kvm_ioapic_put;
 161     dc->reset    = kvm_ioapic_reset;
 162     dc->props    = kvm_ioapic_properties;
 163 }
 164
 165 static const TypeInfo kvm_ioapic_info = {
 166     .name  = "kvm-ioapic",
 167     .parent = TYPE_IOAPIC_COMMON,
 168     .instance_size = sizeof(KVMIOAPICState),
 169     .class_init = kvm_ioapic_class_init,
 170 };
 171
 172 static void kvm_ioapic_register_types(void)
 173 {
 174     type_register_static(&kvm_ioapic_info);
 175 }
 176
 177 type_init(kvm_ioapic_register_types)