hw/intc/xics_kvm.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * PAPR Virtualized Interrupt System, aka ICS/ICP aka xics, in-kernel emulation
   5  *
   6  * Copyright (c) 2013 David Gibson, IBM Corporation.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qapi/error.h"
  30 #include "qemu-common.h"
  31 #include "cpu.h"
  32 #include "hw/hw.h"
  33 #include "trace.h"
  34 #include "hw/ppc/spapr.h"
  35 #include "hw/ppc/xics.h"
  36 #include "kvm_ppc.h"
  37 #include "qemu/config-file.h"
  38 #include "qemu/error-report.h"
  39
  40 #include <sys/ioctl.h>
  41
  42 typedef struct KVMXICSState {
  43     XICSState parent_obj;
  44
  45     int kernel_xics_fd;
  46 } KVMXICSState;
  47
  48 /*
  49  * ICP-KVM
  50  */
  51 static void icp_get_kvm_state(ICPState *ss)
  52 {
  53     uint64_t state;
  54     struct kvm_one_reg reg = {
  55         .id = KVM_REG_PPC_ICP_STATE,
  56         .addr = (uintptr_t)&state,
  57     };
  58     int ret;
  59
  60     /* ICP for this CPU thread is not in use, exiting */
  61     if (!ss->cs) {
  62         return;
  63     }
  64
  65     ret = kvm_vcpu_ioctl(ss->cs, KVM_GET_ONE_REG, &reg);
  66     if (ret != 0) {
  67         error_report("Unable to retrieve KVM interrupt controller state"
  68                 " for CPU %ld: %s", kvm_arch_vcpu_id(ss->cs), strerror(errno));
  69         exit(1);
  70     }
  71
  72     ss->xirr = state >> KVM_REG_PPC_ICP_XISR_SHIFT;
  73     ss->mfrr = (state >> KVM_REG_PPC_ICP_MFRR_SHIFT)
  74         & KVM_REG_PPC_ICP_MFRR_MASK;
  75     ss->pending_priority = (state >> KVM_REG_PPC_ICP_PPRI_SHIFT)
  76         & KVM_REG_PPC_ICP_PPRI_MASK;
  77 }
  78
  79 static int icp_set_kvm_state(ICPState *ss, int version_id)
  80 {
  81     uint64_t state;
  82     struct kvm_one_reg reg = {
  83         .id = KVM_REG_PPC_ICP_STATE,
  84         .addr = (uintptr_t)&state,
  85     };
  86     int ret;
  87
  88     /* ICP for this CPU thread is not in use, exiting */
  89     if (!ss->cs) {
  90         return 0;
  91     }
  92
  93     state = ((uint64_t)ss->xirr << KVM_REG_PPC_ICP_XISR_SHIFT)
  94         | ((uint64_t)ss->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
  95         | ((uint64_t)ss->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);
  96
  97     ret = kvm_vcpu_ioctl(ss->cs, KVM_SET_ONE_REG, &reg);
  98     if (ret != 0) {
  99         error_report("Unable to restore KVM interrupt controller state (0x%"
 100                 PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(ss->cs),
 101                 strerror(errno));
 102         return ret;
 103     }
 104
 105     return 0;
 106 }
 107
 108 static void icp_kvm_reset(DeviceState *dev)
 109 {
 110     ICPState *icp = ICP(dev);
 111
 112     icp->xirr = 0;
 113     icp->pending_priority = 0xff;
 114     icp->mfrr = 0xff;
 115
 116     /* Make all outputs are deasserted */
 117     qemu_set_irq(icp->output, 0);
 118
 119     icp_set_kvm_state(icp, 1);
 120 }
 121
 122 static void icp_kvm_class_init(ObjectClass *klass, void *data)
 123 {
 124     DeviceClass *dc = DEVICE_CLASS(klass);
 125     ICPStateClass *icpc = ICP_CLASS(klass);
 126
 127     dc->reset = icp_kvm_reset;
 128     icpc->pre_save = icp_get_kvm_state;
 129     icpc->post_load = icp_set_kvm_state;
 130 }
 131
 132 static const TypeInfo icp_kvm_info = {
 133     .name = TYPE_KVM_ICP,
 134     .parent = TYPE_ICP,
 135     .instance_size = sizeof(ICPState),
 136     .class_init = icp_kvm_class_init,
 137     .class_size = sizeof(ICPStateClass),
 138 };
 139
 140 /*
 141  * ICS-KVM
 142  */
 143 static void ics_get_kvm_state(ICSState *ics)
 144 {
 145     KVMXICSState *icpkvm = KVM_XICS(ics->icp);
 146     uint64_t state;
 147     struct kvm_device_attr attr = {
 148         .flags = 0,
 149         .group = KVM_DEV_XICS_GRP_SOURCES,
 150         .addr = (uint64_t)(uintptr_t)&state,
 151     };
 152     int i;
 153
 154     for (i = 0; i < ics->nr_irqs; i++) {
 155         ICSIRQState *irq = &ics->irqs[i];
 156         int ret;
 157
 158         attr.attr = i + ics->offset;
 159
 160         ret = ioctl(icpkvm->kernel_xics_fd, KVM_GET_DEVICE_ATTR, &attr);
 161         if (ret != 0) {
 162             error_report("Unable to retrieve KVM interrupt controller state"
 163                     " for IRQ %d: %s", i + ics->offset, strerror(errno));
 164             exit(1);
 165         }
 166
 167         irq->server = state & KVM_XICS_DESTINATION_MASK;
 168         irq->saved_priority = (state >> KVM_XICS_PRIORITY_SHIFT)
 169             & KVM_XICS_PRIORITY_MASK;
 170         /*
 171          * To be consistent with the software emulation in xics.c, we
 172          * split out the masked state + priority that we get from the
 173          * kernel into 'current priority' (0xff if masked) and
 174          * 'saved priority' (if masked, this is the priority the
 175          * interrupt had before it was masked).  Masking and unmasking
 176          * are done with the ibm,int-off and ibm,int-on RTAS calls.
 177          */
 178         if (state & KVM_XICS_MASKED) {
 179             irq->priority = 0xff;
 180         } else {
 181             irq->priority = irq->saved_priority;
 182         }
 183
 184         if (state & KVM_XICS_PENDING) {
 185             if (state & KVM_XICS_LEVEL_SENSITIVE) {
 186                 irq->status |= XICS_STATUS_ASSERTED;
 187             } else {
 188                 /*
 189                  * A pending edge-triggered interrupt (or MSI)
 190                  * must have been rejected previously when we
 191                  * first detected it and tried to deliver it,
 192                  * so mark it as pending and previously rejected
 193                  * for consistency with how xics.c works.
 194                  */
 195                 irq->status |= XICS_STATUS_MASKED_PENDING
 196                     | XICS_STATUS_REJECTED;
 197             }
 198         }
 199     }
 200 }
 201
 202 static int ics_set_kvm_state(ICSState *ics, int version_id)
 203 {
 204     KVMXICSState *icpkvm = KVM_XICS(ics->icp);
 205     uint64_t state;
 206     struct kvm_device_attr attr = {
 207         .flags = 0,
 208         .group = KVM_DEV_XICS_GRP_SOURCES,
 209         .addr = (uint64_t)(uintptr_t)&state,
 210     };
 211     int i;
 212
 213     for (i = 0; i < ics->nr_irqs; i++) {
 214         ICSIRQState *irq = &ics->irqs[i];
 215         int ret;
 216
 217         attr.attr = i + ics->offset;
 218
 219         state = irq->server;
 220         state |= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
 221             << KVM_XICS_PRIORITY_SHIFT;
 222         if (irq->priority != irq->saved_priority) {
 223             assert(irq->priority == 0xff);
 224             state |= KVM_XICS_MASKED;
 225         }
 226
 227         if (ics->irqs[i].flags & XICS_FLAGS_IRQ_LSI) {
 228             state |= KVM_XICS_LEVEL_SENSITIVE;
 229             if (irq->status & XICS_STATUS_ASSERTED) {
 230                 state |= KVM_XICS_PENDING;
 231             }
 232         } else {
 233             if (irq->status & XICS_STATUS_MASKED_PENDING) {
 234                 state |= KVM_XICS_PENDING;
 235             }
 236         }
 237
 238         ret = ioctl(icpkvm->kernel_xics_fd, KVM_SET_DEVICE_ATTR, &attr);
 239         if (ret != 0) {
 240             error_report("Unable to restore KVM interrupt controller state"
 241                     " for IRQs %d: %s", i + ics->offset, strerror(errno));
 242             return ret;
 243         }
 244     }
 245
 246     return 0;
 247 }
 248
 249 static void ics_kvm_set_irq(void *opaque, int srcno, int val)
 250 {
 251     ICSState *ics = opaque;
 252     struct kvm_irq_level args;
 253     int rc;
 254
 255     args.irq = srcno + ics->offset;
 256     if (ics->irqs[srcno].flags & XICS_FLAGS_IRQ_MSI) {
 257         if (!val) {
 258             return;
 259         }
 260         args.level = KVM_INTERRUPT_SET;
 261     } else {
 262         args.level = val ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;
 263     }
 264     rc = kvm_vm_ioctl(kvm_state, KVM_IRQ_LINE, &args);
 265     if (rc < 0) {
 266         perror("kvm_irq_line");
 267     }
 268 }
 269
 270 static void ics_kvm_reset(DeviceState *dev)
 271 {
 272     ICSState *ics = ICS(dev);
 273     int i;
 274     uint8_t flags[ics->nr_irqs];
 275
 276     for (i = 0; i < ics->nr_irqs; i++) {
 277         flags[i] = ics->irqs[i].flags;
 278     }
 279
 280     memset(ics->irqs, 0, sizeof(ICSIRQState) * ics->nr_irqs);
 281
 282     for (i = 0; i < ics->nr_irqs; i++) {
 283         ics->irqs[i].priority = 0xff;
 284         ics->irqs[i].saved_priority = 0xff;
 285         ics->irqs[i].flags = flags[i];
 286     }
 287
 288     ics_set_kvm_state(ics, 1);
 289 }
 290
 291 static void ics_kvm_realize(DeviceState *dev, Error **errp)
 292 {
 293     ICSState *ics = ICS(dev);
 294
 295     if (!ics->nr_irqs) {
 296         error_setg(errp, "Number of interrupts needs to be greater 0");
 297         return;
 298     }
 299     ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
 300     ics->qirqs = qemu_allocate_irqs(ics_kvm_set_irq, ics, ics->nr_irqs);
 301 }
 302
 303 static void ics_kvm_class_init(ObjectClass *klass, void *data)
 304 {
 305     DeviceClass *dc = DEVICE_CLASS(klass);
 306     ICSStateClass *icsc = ICS_CLASS(klass);
 307
 308     dc->realize = ics_kvm_realize;
 309     dc->reset = ics_kvm_reset;
 310     icsc->pre_save = ics_get_kvm_state;
 311     icsc->post_load = ics_set_kvm_state;
 312 }
 313
 314 static const TypeInfo ics_kvm_info = {
 315     .name = TYPE_KVM_ICS,
 316     .parent = TYPE_ICS,
 317     .instance_size = sizeof(ICSState),
 318     .class_init = ics_kvm_class_init,
 319 };
 320
 321 /*
 322  * XICS-KVM
 323  */
 324 static void xics_kvm_cpu_setup(XICSState *icp, PowerPCCPU *cpu)
 325 {
 326     CPUState *cs;
 327     ICPState *ss;
 328     KVMXICSState *icpkvm = KVM_XICS(icp);
 329
 330     cs = CPU(cpu);
 331     ss = &icp->ss[cs->cpu_index];
 332
 333     assert(cs->cpu_index < icp->nr_servers);
 334     if (icpkvm->kernel_xics_fd == -1) {
 335         abort();
 336     }
 337
 338     /*
 339      * If we are reusing a parked vCPU fd corresponding to the CPU
 340      * which was hot-removed earlier we don't have to renable
 341      * KVM_CAP_IRQ_XICS capability again.
 342      */
 343     if (ss->cap_irq_xics_enabled) {
 344         return;
 345     }
 346
 347     if (icpkvm->kernel_xics_fd != -1) {
 348         int ret;
 349
 350         ss->cs = cs;
 351
 352         ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0,
 353                                   icpkvm->kernel_xics_fd, kvm_arch_vcpu_id(cs));
 354         if (ret < 0) {
 355             error_report("Unable to connect CPU%ld to kernel XICS: %s",
 356                     kvm_arch_vcpu_id(cs), strerror(errno));
 357             exit(1);
 358         }
 359         ss->cap_irq_xics_enabled = true;
 360     }
 361 }
 362
 363 static void xics_kvm_set_nr_irqs(XICSState *icp, uint32_t nr_irqs, Error **errp)
 364 {
 365     icp->nr_irqs = icp->ics->nr_irqs = nr_irqs;
 366 }
 367
 368 static void xics_kvm_set_nr_servers(XICSState *icp, uint32_t nr_servers,
 369                                     Error **errp)
 370 {
 371     int i;
 372
 373     icp->nr_servers = nr_servers;
 374
 375     icp->ss = g_malloc0(icp->nr_servers*sizeof(ICPState));
 376     for (i = 0; i < icp->nr_servers; i++) {
 377         char buffer[32];
 378         object_initialize(&icp->ss[i], sizeof(icp->ss[i]), TYPE_KVM_ICP);
 379         snprintf(buffer, sizeof(buffer), "icp[%d]", i);
 380         object_property_add_child(OBJECT(icp), buffer, OBJECT(&icp->ss[i]),
 381                                   errp);
 382     }
 383 }
 384
 385 static void rtas_dummy(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 386                        uint32_t token,
 387                        uint32_t nargs, target_ulong args,
 388                        uint32_t nret, target_ulong rets)
 389 {
 390     error_report("pseries: %s must never be called for in-kernel XICS",
 391                  __func__);
 392 }
 393
 394 static void xics_kvm_realize(DeviceState *dev, Error **errp)
 395 {
 396     KVMXICSState *icpkvm = KVM_XICS(dev);
 397     XICSState *icp = XICS_COMMON(dev);
 398     int i, rc;
 399     Error *error = NULL;
 400     struct kvm_create_device xics_create_device = {
 401         .type = KVM_DEV_TYPE_XICS,
 402         .flags = 0,
 403     };
 404
 405     if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_IRQ_XICS)) {
 406         error_setg(errp,
 407                    "KVM and IRQ_XICS capability must be present for in-kernel XICS");
 408         goto fail;
 409     }
 410
 411     spapr_rtas_register(RTAS_IBM_SET_XIVE, "ibm,set-xive", rtas_dummy);
 412     spapr_rtas_register(RTAS_IBM_GET_XIVE, "ibm,get-xive", rtas_dummy);
 413     spapr_rtas_register(RTAS_IBM_INT_OFF, "ibm,int-off", rtas_dummy);
 414     spapr_rtas_register(RTAS_IBM_INT_ON, "ibm,int-on", rtas_dummy);
 415
 416     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_SET_XIVE, "ibm,set-xive");
 417     if (rc < 0) {
 418         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,set-xive");
 419         goto fail;
 420     }
 421
 422     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_GET_XIVE, "ibm,get-xive");
 423     if (rc < 0) {
 424         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,get-xive");
 425         goto fail;
 426     }
 427
 428     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_ON, "ibm,int-on");
 429     if (rc < 0) {
 430         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-on");
 431         goto fail;
 432     }
 433
 434     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_OFF, "ibm,int-off");
 435     if (rc < 0) {
 436         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-off");
 437         goto fail;
 438     }
 439
 440     /* Create the kernel ICP */
 441     rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &xics_create_device);
 442     if (rc < 0) {
 443         error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
 444         goto fail;
 445     }
 446
 447     icpkvm->kernel_xics_fd = xics_create_device.fd;
 448
 449     object_property_set_bool(OBJECT(icp->ics), true, "realized", &error);
 450     if (error) {
 451         error_propagate(errp, error);
 452         goto fail;
 453     }
 454
 455     assert(icp->nr_servers);
 456     for (i = 0; i < icp->nr_servers; i++) {
 457         object_property_set_bool(OBJECT(&icp->ss[i]), true, "realized", &error);
 458         if (error) {
 459             error_propagate(errp, error);
 460             goto fail;
 461         }
 462     }
 463
 464     kvm_kernel_irqchip = true;
 465     kvm_msi_via_irqfd_allowed = true;
 466     kvm_gsi_direct_mapping = true;
 467
 468     return;
 469
 470 fail:
 471     kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
 472     kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");
 473     kvmppc_define_rtas_kernel_token(0, "ibm,int-on");
 474     kvmppc_define_rtas_kernel_token(0, "ibm,int-off");
 475 }
 476
 477 static void xics_kvm_initfn(Object *obj)
 478 {
 479     XICSState *xics = XICS_COMMON(obj);
 480
 481     xics->ics = ICS(object_new(TYPE_KVM_ICS));
 482     object_property_add_child(obj, "ics", OBJECT(xics->ics), NULL);
 483     xics->ics->icp = xics;
 484 }
 485
 486 static void xics_kvm_class_init(ObjectClass *oc, void *data)
 487 {
 488     DeviceClass *dc = DEVICE_CLASS(oc);
 489     XICSStateClass *xsc = XICS_COMMON_CLASS(oc);
 490
 491     dc->realize = xics_kvm_realize;
 492     xsc->cpu_setup = xics_kvm_cpu_setup;
 493     xsc->set_nr_irqs = xics_kvm_set_nr_irqs;
 494     xsc->set_nr_servers = xics_kvm_set_nr_servers;
 495 }
 496
 497 static const TypeInfo xics_kvm_info = {
 498     .name          = TYPE_KVM_XICS,
 499     .parent        = TYPE_XICS_COMMON,
 500     .instance_size = sizeof(KVMXICSState),
 501     .class_init    = xics_kvm_class_init,
 502     .instance_init = xics_kvm_initfn,
 503 };
 504
 505 static void xics_kvm_register_types(void)
 506 {
 507     type_register_static(&xics_kvm_info);
 508     type_register_static(&ics_kvm_info);
 509     type_register_static(&icp_kvm_info);
 510 }
 511
 512 type_init(xics_kvm_register_types)