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