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          <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 #include "qemu/osdep.h"
  13 #include "qemu-common.h"
  14 #include "cpu.h"
  15 #include "hw/i386/apic_internal.h"
  16 #include "hw/pci/msi.h"
  17 #include "sysemu/kvm.h"
  18 #include "target-i386/kvm_i386.h"
  19
  20 static inline void kvm_apic_set_reg(struct kvm_lapic_state *kapic,
  21                                     int reg_id, uint32_t val)
  22 {
  23     *((uint32_t *)(kapic->regs + (reg_id << 4))) = val;
  24 }
  25
  26 static inline uint32_t kvm_apic_get_reg(struct kvm_lapic_state *kapic,
  27                                         int reg_id)
  28 {
  29     return *((uint32_t *)(kapic->regs + (reg_id << 4)));
  30 }
  31
  32 static void kvm_put_apic_state(APICCommonState *s, struct kvm_lapic_state *kapic)
  33 {
  34     int i;
  35
  36     memset(kapic, 0, sizeof(*kapic));
  37     kvm_apic_set_reg(kapic, 0x2, s->id << 24);
  38     kvm_apic_set_reg(kapic, 0x8, s->tpr);
  39     kvm_apic_set_reg(kapic, 0xd, s->log_dest << 24);
  40     kvm_apic_set_reg(kapic, 0xe, s->dest_mode << 28 | 0x0fffffff);
  41     kvm_apic_set_reg(kapic, 0xf, s->spurious_vec);
  42     for (i = 0; i < 8; i++) {
  43         kvm_apic_set_reg(kapic, 0x10 + i, s->isr[i]);
  44         kvm_apic_set_reg(kapic, 0x18 + i, s->tmr[i]);
  45         kvm_apic_set_reg(kapic, 0x20 + i, s->irr[i]);
  46     }
  47     kvm_apic_set_reg(kapic, 0x28, s->esr);
  48     kvm_apic_set_reg(kapic, 0x30, s->icr[0]);
  49     kvm_apic_set_reg(kapic, 0x31, s->icr[1]);
  50     for (i = 0; i < APIC_LVT_NB; i++) {
  51         kvm_apic_set_reg(kapic, 0x32 + i, s->lvt[i]);
  52     }
  53     kvm_apic_set_reg(kapic, 0x38, s->initial_count);
  54     kvm_apic_set_reg(kapic, 0x3e, s->divide_conf);
  55 }
  56
  57 void kvm_get_apic_state(DeviceState *dev, struct kvm_lapic_state *kapic)
  58 {
  59     APICCommonState *s = APIC_COMMON(dev);
  60     int i, v;
  61
  62     s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
  63     s->tpr = kvm_apic_get_reg(kapic, 0x8);
  64     s->arb_id = kvm_apic_get_reg(kapic, 0x9);
  65     s->log_dest = kvm_apic_get_reg(kapic, 0xd) >> 24;
  66     s->dest_mode = kvm_apic_get_reg(kapic, 0xe) >> 28;
  67     s->spurious_vec = kvm_apic_get_reg(kapic, 0xf);
  68     for (i = 0; i < 8; i++) {
  69         s->isr[i] = kvm_apic_get_reg(kapic, 0x10 + i);
  70         s->tmr[i] = kvm_apic_get_reg(kapic, 0x18 + i);
  71         s->irr[i] = kvm_apic_get_reg(kapic, 0x20 + i);
  72     }
  73     s->esr = kvm_apic_get_reg(kapic, 0x28);
  74     s->icr[0] = kvm_apic_get_reg(kapic, 0x30);
  75     s->icr[1] = kvm_apic_get_reg(kapic, 0x31);
  76     for (i = 0; i < APIC_LVT_NB; i++) {
  77         s->lvt[i] = kvm_apic_get_reg(kapic, 0x32 + i);
  78     }
  79     s->initial_count = kvm_apic_get_reg(kapic, 0x38);
  80     s->divide_conf = kvm_apic_get_reg(kapic, 0x3e);
  81
  82     v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
  83     s->count_shift = (v + 1) & 7;
  84
  85     s->initial_count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
  86     apic_next_timer(s, s->initial_count_load_time);
  87 }
  88
  89 static void kvm_apic_set_base(APICCommonState *s, uint64_t val)
  90 {
  91     s->apicbase = val;
  92 }
  93
  94 static void kvm_apic_set_tpr(APICCommonState *s, uint8_t val)
  95 {
  96     s->tpr = (val & 0x0f) << 4;
  97 }
  98
  99 static uint8_t kvm_apic_get_tpr(APICCommonState *s)
 100 {
 101     return s->tpr >> 4;
 102 }
 103
 104 static void kvm_apic_enable_tpr_reporting(APICCommonState *s, bool enable)
 105 {
 106     struct kvm_tpr_access_ctl ctl = {
 107         .enabled = enable
 108     };
 109
 110     kvm_vcpu_ioctl(CPU(s->cpu), KVM_TPR_ACCESS_REPORTING, &ctl);
 111 }
 112
 113 static void kvm_apic_vapic_base_update(APICCommonState *s)
 114 {
 115     struct kvm_vapic_addr vapid_addr = {
 116         .vapic_addr = s->vapic_paddr,
 117     };
 118     int ret;
 119
 120     ret = kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_VAPIC_ADDR, &vapid_addr);
 121     if (ret < 0) {
 122         fprintf(stderr, "KVM: setting VAPIC address failed (%s)\n",
 123                 strerror(-ret));
 124         abort();
 125     }
 126 }
 127
 128 static void kvm_apic_put(CPUState *cs, void *data)
 129 {
 130     APICCommonState *s = data;
 131     struct kvm_lapic_state kapic;
 132     int ret;
 133
 134     kvm_put_apicbase(s->cpu, s->apicbase);
 135     kvm_put_apic_state(s, &kapic);
 136
 137     ret = kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_LAPIC, &kapic);
 138     if (ret < 0) {
 139         fprintf(stderr, "KVM_SET_LAPIC failed: %s\n", strerror(ret));
 140         abort();
 141     }
 142 }
 143
 144 static void kvm_apic_post_load(APICCommonState *s)
 145 {
 146     run_on_cpu(CPU(s->cpu), kvm_apic_put, s);
 147 }
 148
 149 static void do_inject_external_nmi(CPUState *cpu, void *data)
 150 {
 151     APICCommonState *s = data;
 152     uint32_t lvt;
 153     int ret;
 154
 155     cpu_synchronize_state(cpu);
 156
 157     lvt = s->lvt[APIC_LVT_LINT1];
 158     if (!(lvt & APIC_LVT_MASKED) && ((lvt >> 8) & 7) == APIC_DM_NMI) {
 159         ret = kvm_vcpu_ioctl(cpu, KVM_NMI);
 160         if (ret < 0) {
 161             fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
 162                     strerror(-ret));
 163         }
 164     }
 165 }
 166
 167 static void kvm_apic_external_nmi(APICCommonState *s)
 168 {
 169     run_on_cpu(CPU(s->cpu), do_inject_external_nmi, s);
 170 }
 171
 172 static void kvm_send_msi(MSIMessage *msg)
 173 {
 174     int ret;
 175
 176     ret = kvm_irqchip_send_msi(kvm_state, *msg);
 177     if (ret < 0) {
 178         fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
 179                 strerror(-ret));
 180     }
 181 }
 182
 183 static uint64_t kvm_apic_mem_read(void *opaque, hwaddr addr,
 184                                   unsigned size)
 185 {
 186     return ~(uint64_t)0;
 187 }
 188
 189 static void kvm_apic_mem_write(void *opaque, hwaddr addr,
 190                                uint64_t data, unsigned size)
 191 {
 192     MSIMessage msg = { .address = addr, .data = data };
 193
 194     kvm_send_msi(&msg);
 195 }
 196
 197 static const MemoryRegionOps kvm_apic_io_ops = {
 198     .read = kvm_apic_mem_read,
 199     .write = kvm_apic_mem_write,
 200     .endianness = DEVICE_NATIVE_ENDIAN,
 201 };
 202
 203 static void kvm_apic_reset(APICCommonState *s)
 204 {
 205     /* Not used by KVM, which uses the CPU mp_state instead.  */
 206     s->wait_for_sipi = 0;
 207
 208     run_on_cpu(CPU(s->cpu), kvm_apic_put, s);
 209 }
 210
 211 static void kvm_apic_realize(DeviceState *dev, Error **errp)
 212 {
 213     APICCommonState *s = APIC_COMMON(dev);
 214
 215     memory_region_init_io(&s->io_memory, OBJECT(s), &kvm_apic_io_ops, s,
 216                           "kvm-apic-msi", APIC_SPACE_SIZE);
 217
 218     if (kvm_has_gsi_routing()) {
 219         msi_nonbroken = true;
 220     }
 221 }
 222
 223 static void kvm_apic_unrealize(DeviceState *dev, Error **errp)
 224 {
 225 }
 226
 227 static void kvm_apic_class_init(ObjectClass *klass, void *data)
 228 {
 229     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 230
 231     k->realize = kvm_apic_realize;
 232     k->unrealize = kvm_apic_unrealize;
 233     k->reset = kvm_apic_reset;
 234     k->set_base = kvm_apic_set_base;
 235     k->set_tpr = kvm_apic_set_tpr;
 236     k->get_tpr = kvm_apic_get_tpr;
 237     k->post_load = kvm_apic_post_load;
 238     k->enable_tpr_reporting = kvm_apic_enable_tpr_reporting;
 239     k->vapic_base_update = kvm_apic_vapic_base_update;
 240     k->external_nmi = kvm_apic_external_nmi;
 241     k->send_msi = kvm_send_msi;
 242 }
 243
 244 static const TypeInfo kvm_apic_info = {
 245     .name = "kvm-apic",
 246     .parent = TYPE_APIC_COMMON,
 247     .instance_size = sizeof(APICCommonState),
 248     .class_init = kvm_apic_class_init,
 249 };
 250
 251 static void kvm_apic_register_types(void)
 252 {
 253     type_register_static(&kvm_apic_info);
 254 }
 255
 256 type_init(kvm_apic_register_types)