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     if (kvm_has_x2apic_api() && s->apicbase & MSR_IA32_APICBASE_EXTD) {
  38         kvm_apic_set_reg(kapic, 0x2, s->initial_apic_id);
  39     } else {
  40         kvm_apic_set_reg(kapic, 0x2, s->id << 24);
  41     }
  42     kvm_apic_set_reg(kapic, 0x8, s->tpr);
  43     kvm_apic_set_reg(kapic, 0xd, s->log_dest << 24);
  44     kvm_apic_set_reg(kapic, 0xe, s->dest_mode << 28 | 0x0fffffff);
  45     kvm_apic_set_reg(kapic, 0xf, s->spurious_vec);
  46     for (i = 0; i < 8; i++) {
  47         kvm_apic_set_reg(kapic, 0x10 + i, s->isr[i]);
  48         kvm_apic_set_reg(kapic, 0x18 + i, s->tmr[i]);
  49         kvm_apic_set_reg(kapic, 0x20 + i, s->irr[i]);
  50     }
  51     kvm_apic_set_reg(kapic, 0x28, s->esr);
  52     kvm_apic_set_reg(kapic, 0x30, s->icr[0]);
  53     kvm_apic_set_reg(kapic, 0x31, s->icr[1]);
  54     for (i = 0; i < APIC_LVT_NB; i++) {
  55         kvm_apic_set_reg(kapic, 0x32 + i, s->lvt[i]);
  56     }
  57     kvm_apic_set_reg(kapic, 0x38, s->initial_count);
  58     kvm_apic_set_reg(kapic, 0x3e, s->divide_conf);
  59 }
  60
  61 void kvm_get_apic_state(DeviceState *dev, struct kvm_lapic_state *kapic)
  62 {
  63     APICCommonState *s = APIC_COMMON(dev);
  64     int i, v;
  65
  66     if (kvm_has_x2apic_api() && s->apicbase & MSR_IA32_APICBASE_EXTD) {
  67         assert(kvm_apic_get_reg(kapic, 0x2) == s->initial_apic_id);
  68     } else {
  69         s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
  70     }
  71     s->tpr = kvm_apic_get_reg(kapic, 0x8);
  72     s->arb_id = kvm_apic_get_reg(kapic, 0x9);
  73     s->log_dest = kvm_apic_get_reg(kapic, 0xd) >> 24;
  74     s->dest_mode = kvm_apic_get_reg(kapic, 0xe) >> 28;
  75     s->spurious_vec = kvm_apic_get_reg(kapic, 0xf);
  76     for (i = 0; i < 8; i++) {
  77         s->isr[i] = kvm_apic_get_reg(kapic, 0x10 + i);
  78         s->tmr[i] = kvm_apic_get_reg(kapic, 0x18 + i);
  79         s->irr[i] = kvm_apic_get_reg(kapic, 0x20 + i);
  80     }
  81     s->esr = kvm_apic_get_reg(kapic, 0x28);
  82     s->icr[0] = kvm_apic_get_reg(kapic, 0x30);
  83     s->icr[1] = kvm_apic_get_reg(kapic, 0x31);
  84     for (i = 0; i < APIC_LVT_NB; i++) {
  85         s->lvt[i] = kvm_apic_get_reg(kapic, 0x32 + i);
  86     }
  87     s->initial_count = kvm_apic_get_reg(kapic, 0x38);
  88     s->divide_conf = kvm_apic_get_reg(kapic, 0x3e);
  89
  90     v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
  91     s->count_shift = (v + 1) & 7;
  92
  93     s->initial_count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
  94     apic_next_timer(s, s->initial_count_load_time);
  95 }
  96
  97 static void kvm_apic_set_base(APICCommonState *s, uint64_t val)
  98 {
  99     s->apicbase = val;
 100 }
 101
 102 static void kvm_apic_set_tpr(APICCommonState *s, uint8_t val)
 103 {
 104     s->tpr = (val & 0x0f) << 4;
 105 }
 106
 107 static uint8_t kvm_apic_get_tpr(APICCommonState *s)
 108 {
 109     return s->tpr >> 4;
 110 }
 111
 112 static void kvm_apic_enable_tpr_reporting(APICCommonState *s, bool enable)
 113 {
 114     struct kvm_tpr_access_ctl ctl = {
 115         .enabled = enable
 116     };
 117
 118     kvm_vcpu_ioctl(CPU(s->cpu), KVM_TPR_ACCESS_REPORTING, &ctl);
 119 }
 120
 121 static void kvm_apic_vapic_base_update(APICCommonState *s)
 122 {
 123     struct kvm_vapic_addr vapid_addr = {
 124         .vapic_addr = s->vapic_paddr,
 125     };
 126     int ret;
 127
 128     ret = kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_VAPIC_ADDR, &vapid_addr);
 129     if (ret < 0) {
 130         fprintf(stderr, "KVM: setting VAPIC address failed (%s)\n",
 131                 strerror(-ret));
 132         abort();
 133     }
 134 }
 135
 136 static void kvm_apic_put(CPUState *cs, void *data)
 137 {
 138     APICCommonState *s = data;
 139     struct kvm_lapic_state kapic;
 140     int ret;
 141
 142     kvm_put_apicbase(s->cpu, s->apicbase);
 143     kvm_put_apic_state(s, &kapic);
 144
 145     ret = kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_LAPIC, &kapic);
 146     if (ret < 0) {
 147         fprintf(stderr, "KVM_SET_LAPIC failed: %s\n", strerror(ret));
 148         abort();
 149     }
 150 }
 151
 152 static void kvm_apic_post_load(APICCommonState *s)
 153 {
 154     run_on_cpu(CPU(s->cpu), kvm_apic_put, s);
 155 }
 156
 157 static void do_inject_external_nmi(CPUState *cpu, void *data)
 158 {
 159     APICCommonState *s = data;
 160     uint32_t lvt;
 161     int ret;
 162
 163     cpu_synchronize_state(cpu);
 164
 165     lvt = s->lvt[APIC_LVT_LINT1];
 166     if (!(lvt & APIC_LVT_MASKED) && ((lvt >> 8) & 7) == APIC_DM_NMI) {
 167         ret = kvm_vcpu_ioctl(cpu, KVM_NMI);
 168         if (ret < 0) {
 169             fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
 170                     strerror(-ret));
 171         }
 172     }
 173 }
 174
 175 static void kvm_apic_external_nmi(APICCommonState *s)
 176 {
 177     run_on_cpu(CPU(s->cpu), do_inject_external_nmi, s);
 178 }
 179
 180 static void kvm_send_msi(MSIMessage *msg)
 181 {
 182     int ret;
 183
 184     ret = kvm_irqchip_send_msi(kvm_state, *msg);
 185     if (ret < 0) {
 186         fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
 187                 strerror(-ret));
 188     }
 189 }
 190
 191 static uint64_t kvm_apic_mem_read(void *opaque, hwaddr addr,
 192                                   unsigned size)
 193 {
 194     return ~(uint64_t)0;
 195 }
 196
 197 static void kvm_apic_mem_write(void *opaque, hwaddr addr,
 198                                uint64_t data, unsigned size)
 199 {
 200     MSIMessage msg = { .address = addr, .data = data };
 201
 202     kvm_send_msi(&msg);
 203 }
 204
 205 static const MemoryRegionOps kvm_apic_io_ops = {
 206     .read = kvm_apic_mem_read,
 207     .write = kvm_apic_mem_write,
 208     .endianness = DEVICE_NATIVE_ENDIAN,
 209 };
 210
 211 static void kvm_apic_reset(APICCommonState *s)
 212 {
 213     /* Not used by KVM, which uses the CPU mp_state instead.  */
 214     s->wait_for_sipi = 0;
 215
 216     run_on_cpu(CPU(s->cpu), kvm_apic_put, s);
 217 }
 218
 219 static void kvm_apic_realize(DeviceState *dev, Error **errp)
 220 {
 221     APICCommonState *s = APIC_COMMON(dev);
 222
 223     memory_region_init_io(&s->io_memory, OBJECT(s), &kvm_apic_io_ops, s,
 224                           "kvm-apic-msi", APIC_SPACE_SIZE);
 225
 226     if (kvm_has_gsi_routing()) {
 227         msi_nonbroken = true;
 228     }
 229 }
 230
 231 static void kvm_apic_unrealize(DeviceState *dev, Error **errp)
 232 {
 233 }
 234
 235 static void kvm_apic_class_init(ObjectClass *klass, void *data)
 236 {
 237     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 238
 239     k->realize = kvm_apic_realize;
 240     k->unrealize = kvm_apic_unrealize;
 241     k->reset = kvm_apic_reset;
 242     k->set_base = kvm_apic_set_base;
 243     k->set_tpr = kvm_apic_set_tpr;
 244     k->get_tpr = kvm_apic_get_tpr;
 245     k->post_load = kvm_apic_post_load;
 246     k->enable_tpr_reporting = kvm_apic_enable_tpr_reporting;
 247     k->vapic_base_update = kvm_apic_vapic_base_update;
 248     k->external_nmi = kvm_apic_external_nmi;
 249     k->send_msi = kvm_send_msi;
 250 }
 251
 252 static const TypeInfo kvm_apic_info = {
 253     .name = "kvm-apic",
 254     .parent = TYPE_APIC_COMMON,
 255     .instance_size = sizeof(APICCommonState),
 256     .class_init = kvm_apic_class_init,
 257 };
 258
 259 static void kvm_apic_register_types(void)
 260 {
 261     type_register_static(&kvm_apic_info);
 262 }
 263
 264 type_init(kvm_apic_register_types)