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