target-arm/kvm.c

   1 /*
   2  * ARM implementation of KVM hooks
   3  *
   4  * Copyright Christoffer Dall 2009-2010
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #include <stdio.h>
  12 #include <sys/types.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/mman.h>
  15
  16 #include <linux/kvm.h>
  17
  18 #include "qemu-common.h"
  19 #include "qemu/timer.h"
  20 #include "sysemu/sysemu.h"
  21 #include "sysemu/kvm.h"
  22 #include "kvm_arm.h"
  23 #include "cpu.h"
  24 #include "hw/arm-misc.h"
  25
  26 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  27     KVM_CAP_LAST_INFO
  28 };
  29
  30 int kvm_arch_init(KVMState *s)
  31 {
  32     /* For ARM interrupt delivery is always asynchronous,
  33      * whether we are using an in-kernel VGIC or not.
  34      */
  35     kvm_async_interrupts_allowed = true;
  36     return 0;
  37 }
  38
  39 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
  40 {
  41     return cpu->cpu_index;
  42 }
  43
  44 int kvm_arch_init_vcpu(CPUState *cs)
  45 {
  46     struct kvm_vcpu_init init;
  47     int ret;
  48     uint64_t v;
  49     struct kvm_one_reg r;
  50
  51     init.target = KVM_ARM_TARGET_CORTEX_A15;
  52     memset(init.features, 0, sizeof(init.features));
  53     ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
  54     if (ret) {
  55         return ret;
  56     }
  57     /* Query the kernel to make sure it supports 32 VFP
  58      * registers: QEMU's "cortex-a15" CPU is always a
  59      * VFP-D32 core. The simplest way to do this is just
  60      * to attempt to read register d31.
  61      */
  62     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP | 31;
  63     r.addr = (uintptr_t)(&v);
  64     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
  65     if (ret == ENOENT) {
  66         return EINVAL;
  67     }
  68     return ret;
  69 }
  70
  71 /* We track all the KVM devices which need their memory addresses
  72  * passing to the kernel in a list of these structures.
  73  * When board init is complete we run through the list and
  74  * tell the kernel the base addresses of the memory regions.
  75  * We use a MemoryListener to track mapping and unmapping of
  76  * the regions during board creation, so the board models don't
  77  * need to do anything special for the KVM case.
  78  */
  79 typedef struct KVMDevice {
  80     struct kvm_arm_device_addr kda;
  81     MemoryRegion *mr;
  82     QSLIST_ENTRY(KVMDevice) entries;
  83 } KVMDevice;
  84
  85 static QSLIST_HEAD(kvm_devices_head, KVMDevice) kvm_devices_head;
  86
  87 static void kvm_arm_devlistener_add(MemoryListener *listener,
  88                                     MemoryRegionSection *section)
  89 {
  90     KVMDevice *kd;
  91
  92     QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
  93         if (section->mr == kd->mr) {
  94             kd->kda.addr = section->offset_within_address_space;
  95         }
  96     }
  97 }
  98
  99 static void kvm_arm_devlistener_del(MemoryListener *listener,
 100                                     MemoryRegionSection *section)
 101 {
 102     KVMDevice *kd;
 103
 104     QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
 105         if (section->mr == kd->mr) {
 106             kd->kda.addr = -1;
 107         }
 108     }
 109 }
 110
 111 static MemoryListener devlistener = {
 112     .region_add = kvm_arm_devlistener_add,
 113     .region_del = kvm_arm_devlistener_del,
 114 };
 115
 116 static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
 117 {
 118     KVMDevice *kd, *tkd;
 119
 120     memory_listener_unregister(&devlistener);
 121     QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) {
 122         if (kd->kda.addr != -1) {
 123             if (kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR,
 124                              &kd->kda) < 0) {
 125                 fprintf(stderr, "KVM_ARM_SET_DEVICE_ADDRESS failed: %s\n",
 126                         strerror(errno));
 127                 abort();
 128             }
 129         }
 130         g_free(kd);
 131     }
 132 }
 133
 134 static Notifier notify = {
 135     .notify = kvm_arm_machine_init_done,
 136 };
 137
 138 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid)
 139 {
 140     KVMDevice *kd;
 141
 142     if (!kvm_irqchip_in_kernel()) {
 143         return;
 144     }
 145
 146     if (QSLIST_EMPTY(&kvm_devices_head)) {
 147         memory_listener_register(&devlistener, NULL);
 148         qemu_add_machine_init_done_notifier(&notify);
 149     }
 150     kd = g_new0(KVMDevice, 1);
 151     kd->mr = mr;
 152     kd->kda.id = devid;
 153     kd->kda.addr = -1;
 154     QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
 155 }
 156
 157 typedef struct Reg {
 158     uint64_t id;
 159     int offset;
 160 } Reg;
 161
 162 #define COREREG(KERNELNAME, QEMUFIELD)                       \
 163     {                                                        \
 164         KVM_REG_ARM | KVM_REG_SIZE_U32 |                     \
 165         KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(KERNELNAME), \
 166         offsetof(CPUARMState, QEMUFIELD)                     \
 167     }
 168
 169 #define CP15REG(CRN, CRM, OPC1, OPC2, QEMUFIELD) \
 170     {                                            \
 171         KVM_REG_ARM | KVM_REG_SIZE_U32 |         \
 172         (15 << KVM_REG_ARM_COPROC_SHIFT) |       \
 173         ((CRN) << KVM_REG_ARM_32_CRN_SHIFT) |    \
 174         ((CRM) << KVM_REG_ARM_CRM_SHIFT) |       \
 175         ((OPC1) << KVM_REG_ARM_OPC1_SHIFT) |     \
 176         ((OPC2) << KVM_REG_ARM_32_OPC2_SHIFT),   \
 177         offsetof(CPUARMState, QEMUFIELD)         \
 178     }
 179
 180 #define VFPSYSREG(R)                                       \
 181     {                                                      \
 182         KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP | \
 183         KVM_REG_ARM_VFP_##R,                               \
 184         offsetof(CPUARMState, vfp.xregs[ARM_VFP_##R])      \
 185     }
 186
 187 static const Reg regs[] = {
 188     /* R0_usr .. R14_usr */
 189     COREREG(usr_regs.uregs[0], regs[0]),
 190     COREREG(usr_regs.uregs[1], regs[1]),
 191     COREREG(usr_regs.uregs[2], regs[2]),
 192     COREREG(usr_regs.uregs[3], regs[3]),
 193     COREREG(usr_regs.uregs[4], regs[4]),
 194     COREREG(usr_regs.uregs[5], regs[5]),
 195     COREREG(usr_regs.uregs[6], regs[6]),
 196     COREREG(usr_regs.uregs[7], regs[7]),
 197     COREREG(usr_regs.uregs[8], usr_regs[0]),
 198     COREREG(usr_regs.uregs[9], usr_regs[1]),
 199     COREREG(usr_regs.uregs[10], usr_regs[2]),
 200     COREREG(usr_regs.uregs[11], usr_regs[3]),
 201     COREREG(usr_regs.uregs[12], usr_regs[4]),
 202     COREREG(usr_regs.uregs[13], banked_r13[0]),
 203     COREREG(usr_regs.uregs[14], banked_r14[0]),
 204     /* R13, R14, SPSR for SVC, ABT, UND, IRQ banks */
 205     COREREG(svc_regs[0], banked_r13[1]),
 206     COREREG(svc_regs[1], banked_r14[1]),
 207     COREREG(svc_regs[2], banked_spsr[1]),
 208     COREREG(abt_regs[0], banked_r13[2]),
 209     COREREG(abt_regs[1], banked_r14[2]),
 210     COREREG(abt_regs[2], banked_spsr[2]),
 211     COREREG(und_regs[0], banked_r13[3]),
 212     COREREG(und_regs[1], banked_r14[3]),
 213     COREREG(und_regs[2], banked_spsr[3]),
 214     COREREG(irq_regs[0], banked_r13[4]),
 215     COREREG(irq_regs[1], banked_r14[4]),
 216     COREREG(irq_regs[2], banked_spsr[4]),
 217     /* R8_fiq .. R14_fiq and SPSR_fiq */
 218     COREREG(fiq_regs[0], fiq_regs[0]),
 219     COREREG(fiq_regs[1], fiq_regs[1]),
 220     COREREG(fiq_regs[2], fiq_regs[2]),
 221     COREREG(fiq_regs[3], fiq_regs[3]),
 222     COREREG(fiq_regs[4], fiq_regs[4]),
 223     COREREG(fiq_regs[5], banked_r13[5]),
 224     COREREG(fiq_regs[6], banked_r14[5]),
 225     COREREG(fiq_regs[7], banked_spsr[5]),
 226     /* R15 */
 227     COREREG(usr_regs.uregs[15], regs[15]),
 228     /* A non-comprehensive set of cp15 registers.
 229      * TODO: drive this from the cp_regs hashtable instead.
 230      */
 231     CP15REG(1, 0, 0, 0, cp15.c1_sys), /* SCTLR */
 232     CP15REG(2, 0, 0, 2, cp15.c2_control), /* TTBCR */
 233     CP15REG(3, 0, 0, 0, cp15.c3), /* DACR */
 234     /* VFP system registers */
 235     VFPSYSREG(FPSID),
 236     VFPSYSREG(MVFR1),
 237     VFPSYSREG(MVFR0),
 238     VFPSYSREG(FPEXC),
 239     VFPSYSREG(FPINST),
 240     VFPSYSREG(FPINST2),
 241 };
 242
 243 int kvm_arch_put_registers(CPUState *cs, int level)
 244 {
 245     ARMCPU *cpu = ARM_CPU(cs);
 246     CPUARMState *env = &cpu->env;
 247     struct kvm_one_reg r;
 248     int mode, bn;
 249     int ret, i;
 250     uint32_t cpsr, fpscr;
 251     uint64_t ttbr;
 252
 253     /* Make sure the banked regs are properly set */
 254     mode = env->uncached_cpsr & CPSR_M;
 255     bn = bank_number(mode);
 256     if (mode == ARM_CPU_MODE_FIQ) {
 257         memcpy(env->fiq_regs, env->regs + 8, 5 * sizeof(uint32_t));
 258     } else {
 259         memcpy(env->usr_regs, env->regs + 8, 5 * sizeof(uint32_t));
 260     }
 261     env->banked_r13[bn] = env->regs[13];
 262     env->banked_r14[bn] = env->regs[14];
 263     env->banked_spsr[bn] = env->spsr;
 264
 265     /* Now we can safely copy stuff down to the kernel */
 266     for (i = 0; i < ARRAY_SIZE(regs); i++) {
 267         r.id = regs[i].id;
 268         r.addr = (uintptr_t)(env) + regs[i].offset;
 269         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 270         if (ret) {
 271             return ret;
 272         }
 273     }
 274
 275     /* Special cases which aren't a single CPUARMState field */
 276     cpsr = cpsr_read(env);
 277     r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 |
 278         KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr);
 279     r.addr = (uintptr_t)(&cpsr);
 280     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 281     if (ret) {
 282         return ret;
 283     }
 284
 285     /* TTBR0: cp15 crm=2 opc1=0 */
 286     ttbr = ((uint64_t)env->cp15.c2_base0_hi << 32) | env->cp15.c2_base0;
 287     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | (15 << KVM_REG_ARM_COPROC_SHIFT) |
 288         (2 << KVM_REG_ARM_CRM_SHIFT) | (0 << KVM_REG_ARM_OPC1_SHIFT);
 289     r.addr = (uintptr_t)(&ttbr);
 290     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 291     if (ret) {
 292         return ret;
 293     }
 294
 295     /* TTBR1: cp15 crm=2 opc1=1 */
 296     ttbr = ((uint64_t)env->cp15.c2_base1_hi << 32) | env->cp15.c2_base1;
 297     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | (15 << KVM_REG_ARM_COPROC_SHIFT) |
 298         (2 << KVM_REG_ARM_CRM_SHIFT) | (1 << KVM_REG_ARM_OPC1_SHIFT);
 299     r.addr = (uintptr_t)(&ttbr);
 300     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 301     if (ret) {
 302         return ret;
 303     }
 304
 305     /* VFP registers */
 306     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP;
 307     for (i = 0; i < 32; i++) {
 308         r.addr = (uintptr_t)(&env->vfp.regs[i]);
 309         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 310         if (ret) {
 311             return ret;
 312         }
 313         r.id++;
 314     }
 315
 316     r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP |
 317         KVM_REG_ARM_VFP_FPSCR;
 318     fpscr = vfp_get_fpscr(env);
 319     r.addr = (uintptr_t)&fpscr;
 320     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 321
 322     return ret;
 323 }
 324
 325 int kvm_arch_get_registers(CPUState *cs)
 326 {
 327     ARMCPU *cpu = ARM_CPU(cs);
 328     CPUARMState *env = &cpu->env;
 329     struct kvm_one_reg r;
 330     int mode, bn;
 331     int ret, i;
 332     uint32_t cpsr, fpscr;
 333     uint64_t ttbr;
 334
 335     for (i = 0; i < ARRAY_SIZE(regs); i++) {
 336         r.id = regs[i].id;
 337         r.addr = (uintptr_t)(env) + regs[i].offset;
 338         ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 339         if (ret) {
 340             return ret;
 341         }
 342     }
 343
 344     /* Special cases which aren't a single CPUARMState field */
 345     r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 |
 346         KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr);
 347     r.addr = (uintptr_t)(&cpsr);
 348     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 349     if (ret) {
 350         return ret;
 351     }
 352     cpsr_write(env, cpsr, 0xffffffff);
 353
 354     /* TTBR0: cp15 crm=2 opc1=0 */
 355     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | (15 << KVM_REG_ARM_COPROC_SHIFT) |
 356         (2 << KVM_REG_ARM_CRM_SHIFT) | (0 << KVM_REG_ARM_OPC1_SHIFT);
 357     r.addr = (uintptr_t)(&ttbr);
 358     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 359     if (ret) {
 360         return ret;
 361     }
 362     env->cp15.c2_base0_hi = ttbr >> 32;
 363     env->cp15.c2_base0 = ttbr;
 364
 365     /* TTBR1: cp15 crm=2 opc1=1 */
 366     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | (15 << KVM_REG_ARM_COPROC_SHIFT) |
 367         (2 << KVM_REG_ARM_CRM_SHIFT) | (1 << KVM_REG_ARM_OPC1_SHIFT);
 368     r.addr = (uintptr_t)(&ttbr);
 369     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 370     if (ret) {
 371         return ret;
 372     }
 373     env->cp15.c2_base1_hi = ttbr >> 32;
 374     env->cp15.c2_base1 = ttbr;
 375
 376     /* Make sure the current mode regs are properly set */
 377     mode = env->uncached_cpsr & CPSR_M;
 378     bn = bank_number(mode);
 379     if (mode == ARM_CPU_MODE_FIQ) {
 380         memcpy(env->regs + 8, env->fiq_regs, 5 * sizeof(uint32_t));
 381     } else {
 382         memcpy(env->regs + 8, env->usr_regs, 5 * sizeof(uint32_t));
 383     }
 384     env->regs[13] = env->banked_r13[bn];
 385     env->regs[14] = env->banked_r14[bn];
 386     env->spsr = env->banked_spsr[bn];
 387
 388     /* The main GET_ONE_REG loop above set c2_control, but we need to
 389      * update some extra cached precomputed values too.
 390      * When this is driven from the cp_regs hashtable then this ugliness
 391      * can disappear because we'll use the access function which sets
 392      * these values automatically.
 393      */
 394     env->cp15.c2_mask = ~(0xffffffffu >> env->cp15.c2_control);
 395     env->cp15.c2_base_mask = ~(0x3fffu >> env->cp15.c2_control);
 396
 397     /* VFP registers */
 398     r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP;
 399     for (i = 0; i < 32; i++) {
 400         r.addr = (uintptr_t)(&env->vfp.regs[i]);
 401         ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 402         if (ret) {
 403             return ret;
 404         }
 405         r.id++;
 406     }
 407
 408     r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP |
 409         KVM_REG_ARM_VFP_FPSCR;
 410     r.addr = (uintptr_t)&fpscr;
 411     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 412     if (ret) {
 413         return ret;
 414     }
 415     vfp_set_fpscr(env, fpscr);
 416
 417     return 0;
 418 }
 419
 420 void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
 421 {
 422 }
 423
 424 void kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
 425 {
 426 }
 427
 428 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 429 {
 430     return 0;
 431 }
 432
 433 void kvm_arch_reset_vcpu(CPUState *cs)
 434 {
 435 }
 436
 437 bool kvm_arch_stop_on_emulation_error(CPUState *cs)
 438 {
 439     return true;
 440 }
 441
 442 int kvm_arch_process_async_events(CPUState *cs)
 443 {
 444     return 0;
 445 }
 446
 447 int kvm_arch_on_sigbus_vcpu(CPUState *cs, int code, void *addr)
 448 {
 449     return 1;
 450 }
 451
 452 int kvm_arch_on_sigbus(int code, void *addr)
 453 {
 454     return 1;
 455 }
 456
 457 void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
 458 {
 459     qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
 460 }
 461
 462 int kvm_arch_insert_sw_breakpoint(CPUState *cs,
 463                                   struct kvm_sw_breakpoint *bp)
 464 {
 465     qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
 466     return -EINVAL;
 467 }
 468
 469 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
 470                                   target_ulong len, int type)
 471 {
 472     qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
 473     return -EINVAL;
 474 }
 475
 476 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
 477                                   target_ulong len, int type)
 478 {
 479     qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
 480     return -EINVAL;
 481 }
 482
 483 int kvm_arch_remove_sw_breakpoint(CPUState *cs,
 484                                   struct kvm_sw_breakpoint *bp)
 485 {
 486     qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
 487     return -EINVAL;
 488 }
 489
 490 void kvm_arch_remove_all_hw_breakpoints(void)
 491 {
 492     qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
 493 }