hw/i386/kvm/apic.c

   1 /*
   2  * KVM in-kernel APIC support
   3  *
   4  * Copyright (c) 2011 Siemens AG
   5  *
   6  * Authors:
   7  *  Jan Kiszka          <[email protected]>
   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/i386/apic_internal.h"
  13 #include "hw/pci/msi.h"
  14 #include "sysemu/kvm.h"
  15
  16 static inline void kvm_apic_set_reg(struct kvm_lapic_state *kapic,
  17                                     int reg_id, uint32_t val)
  18 {
  19     *((uint32_t *)(kapic->regs + (reg_id << 4))) = val;
  20 }
  21
  22 static inline uint32_t kvm_apic_get_reg(struct kvm_lapic_state *kapic,
  23                                         int reg_id)
  24 {
  25     return *((uint32_t *)(kapic->regs + (reg_id << 4)));
  26 }
  27
  28 void kvm_put_apic_state(DeviceState *dev, struct kvm_lapic_state *kapic)
  29 {
  30     APICCommonState *s = APIC_COMMON(dev);
  31     int i;
  32
  33     memset(kapic, 0, sizeof(*kapic));
  34     kvm_apic_set_reg(kapic, 0x2, s->id << 24);
  35     kvm_apic_set_reg(kapic, 0x8, s->tpr);
  36     kvm_apic_set_reg(kapic, 0xd, s->log_dest << 24);
  37     kvm_apic_set_reg(kapic, 0xe, s->dest_mode << 28 | 0x0fffffff);
  38     kvm_apic_set_reg(kapic, 0xf, s->spurious_vec);
  39     for (i = 0; i < 8; i++) {
  40         kvm_apic_set_reg(kapic, 0x10 + i, s->isr[i]);
  41         kvm_apic_set_reg(kapic, 0x18 + i, s->tmr[i]);
  42         kvm_apic_set_reg(kapic, 0x20 + i, s->irr[i]);
  43     }
  44     kvm_apic_set_reg(kapic, 0x28, s->esr);
  45     kvm_apic_set_reg(kapic, 0x30, s->icr[0]);
  46     kvm_apic_set_reg(kapic, 0x31, s->icr[1]);
  47     for (i = 0; i < APIC_LVT_NB; i++) {
  48         kvm_apic_set_reg(kapic, 0x32 + i, s->lvt[i]);
  49     }
  50     kvm_apic_set_reg(kapic, 0x38, s->initial_count);
  51     kvm_apic_set_reg(kapic, 0x3e, s->divide_conf);
  52 }
  53
  54 void kvm_get_apic_state(DeviceState *dev, struct kvm_lapic_state *kapic)
  55 {
  56     APICCommonState *s = APIC_COMMON(dev);
  57     int i, v;
  58
  59     s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
  60     s->tpr = kvm_apic_get_reg(kapic, 0x8);
  61     s->arb_id = kvm_apic_get_reg(kapic, 0x9);
  62     s->log_dest = kvm_apic_get_reg(kapic, 0xd) >> 24;
  63     s->dest_mode = kvm_apic_get_reg(kapic, 0xe) >> 28;
  64     s->spurious_vec = kvm_apic_get_reg(kapic, 0xf);
  65     for (i = 0; i < 8; i++) {
  66         s->isr[i] = kvm_apic_get_reg(kapic, 0x10 + i);
  67         s->tmr[i] = kvm_apic_get_reg(kapic, 0x18 + i);
  68         s->irr[i] = kvm_apic_get_reg(kapic, 0x20 + i);
  69     }
  70     s->esr = kvm_apic_get_reg(kapic, 0x28);
  71     s->icr[0] = kvm_apic_get_reg(kapic, 0x30);
  72     s->icr[1] = kvm_apic_get_reg(kapic, 0x31);
  73     for (i = 0; i < APIC_LVT_NB; i++) {
  74         s->lvt[i] = kvm_apic_get_reg(kapic, 0x32 + i);
  75     }
  76     s->initial_count = kvm_apic_get_reg(kapic, 0x38);
  77     s->divide_conf = kvm_apic_get_reg(kapic, 0x3e);
  78
  79     v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
  80     s->count_shift = (v + 1) & 7;
  81
  82     s->initial_count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
  83     apic_next_timer(s, s->initial_count_load_time);
  84 }
  85
  86 static void kvm_apic_set_base(APICCommonState *s, uint64_t val)
  87 {
  88     s->apicbase = val;
  89 }
  90
  91 static void kvm_apic_set_tpr(APICCommonState *s, uint8_t val)
  92 {
  93     s->tpr = (val & 0x0f) << 4;
  94 }
  95
  96 static uint8_t kvm_apic_get_tpr(APICCommonState *s)
  97 {
  98     return s->tpr >> 4;
  99 }
 100
 101 static void kvm_apic_enable_tpr_reporting(APICCommonState *s, bool enable)
 102 {
 103     struct kvm_tpr_access_ctl ctl = {
 104         .enabled = enable
 105     };
 106
 107     kvm_vcpu_ioctl(CPU(s->cpu), KVM_TPR_ACCESS_REPORTING, &ctl);
 108 }
 109
 110 static void kvm_apic_vapic_base_update(APICCommonState *s)
 111 {
 112     struct kvm_vapic_addr vapid_addr = {
 113         .vapic_addr = s->vapic_paddr,
 114     };
 115     int ret;
 116
 117     ret = kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_VAPIC_ADDR, &vapid_addr);
 118     if (ret < 0) {
 119         fprintf(stderr, "KVM: setting VAPIC address failed (%s)\n",
 120                 strerror(-ret));
 121         abort();
 122     }
 123 }
 124
 125 static void do_inject_external_nmi(void *data)
 126 {
 127     APICCommonState *s = data;
 128     CPUState *cpu = CPU(s->cpu);
 129     uint32_t lvt;
 130     int ret;
 131
 132     cpu_synchronize_state(cpu);
 133
 134     lvt = s->lvt[APIC_LVT_LINT1];
 135     if (!(lvt & APIC_LVT_MASKED) && ((lvt >> 8) & 7) == APIC_DM_NMI) {
 136         ret = kvm_vcpu_ioctl(cpu, KVM_NMI);
 137         if (ret < 0) {
 138             fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
 139                     strerror(-ret));
 140         }
 141     }
 142 }
 143
 144 static void kvm_apic_external_nmi(APICCommonState *s)
 145 {
 146     run_on_cpu(CPU(s->cpu), do_inject_external_nmi, s);
 147 }
 148
 149 static uint64_t kvm_apic_mem_read(void *opaque, hwaddr addr,
 150                                   unsigned size)
 151 {
 152     return ~(uint64_t)0;
 153 }
 154
 155 static void kvm_apic_mem_write(void *opaque, hwaddr addr,
 156                                uint64_t data, unsigned size)
 157 {
 158     MSIMessage msg = { .address = addr, .data = data };
 159     int ret;
 160
 161     ret = kvm_irqchip_send_msi(kvm_state, msg);
 162     if (ret < 0) {
 163         fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
 164                 strerror(-ret));
 165     }
 166 }
 167
 168 static const MemoryRegionOps kvm_apic_io_ops = {
 169     .read = kvm_apic_mem_read,
 170     .write = kvm_apic_mem_write,
 171     .endianness = DEVICE_NATIVE_ENDIAN,
 172 };
 173
 174 static void kvm_apic_realize(DeviceState *dev, Error **errp)
 175 {
 176     APICCommonState *s = APIC_COMMON(dev);
 177
 178     /* Not used by KVM, which uses the CPU mp_state instead.  */
 179     s->wait_for_sipi = 0;
 180
 181     memory_region_init_io(&s->io_memory, NULL, &kvm_apic_io_ops, s, "kvm-apic-msi",
 182                           APIC_SPACE_SIZE);
 183
 184     if (kvm_has_gsi_routing()) {
 185         msi_supported = true;
 186     }
 187 }
 188
 189 static void kvm_apic_class_init(ObjectClass *klass, void *data)
 190 {
 191     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 192
 193     k->realize = kvm_apic_realize;
 194     k->set_base = kvm_apic_set_base;
 195     k->set_tpr = kvm_apic_set_tpr;
 196     k->get_tpr = kvm_apic_get_tpr;
 197     k->enable_tpr_reporting = kvm_apic_enable_tpr_reporting;
 198     k->vapic_base_update = kvm_apic_vapic_base_update;
 199     k->external_nmi = kvm_apic_external_nmi;
 200 }
 201
 202 static const TypeInfo kvm_apic_info = {
 203     .name = "kvm-apic",
 204     .parent = TYPE_APIC_COMMON,
 205     .instance_size = sizeof(APICCommonState),
 206     .class_init = kvm_apic_class_init,
 207 };
 208
 209 static void kvm_apic_register_types(void)
 210 {
 211     type_register_static(&kvm_apic_info);
 212 }
 213
 214 type_init(kvm_apic_register_types)