vmm_dev.c revision 284894
1/*- 2 * Copyright (c) 2011 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/10/sys/amd64/vmm/vmm_dev.c 284894 2015-06-27 22:48:22Z neel $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_dev.c 284894 2015-06-27 22:48:22Z neel $"); 31 32#include <sys/param.h> 33#include <sys/kernel.h> 34#include <sys/queue.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/malloc.h> 38#include <sys/conf.h> 39#include <sys/sysctl.h> 40#include <sys/libkern.h> 41#include <sys/ioccom.h> 42#include <sys/mman.h> 43#include <sys/uio.h> 44 45#include <vm/vm.h> 46#include <vm/pmap.h> 47#include <vm/vm_map.h> 48 49#include <machine/vmparam.h> 50#include <machine/vmm.h> 51#include <machine/vmm_instruction_emul.h> 52#include <machine/vmm_dev.h> 53 54#include "vmm_lapic.h" 55#include "vmm_stat.h" 56#include "vmm_mem.h" 57#include "io/ppt.h" 58#include "io/vatpic.h" 59#include "io/vioapic.h" 60#include "io/vhpet.h" 61#include "io/vrtc.h" 62 63struct vmmdev_softc { 64 struct vm *vm; /* vm instance cookie */ 65 struct cdev *cdev; 66 SLIST_ENTRY(vmmdev_softc) link; 67 int flags; 68}; 69#define VSC_LINKED 0x01 70 71static SLIST_HEAD(, vmmdev_softc) head; 72 73static struct mtx vmmdev_mtx; 74 75static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev"); 76 77SYSCTL_DECL(_hw_vmm); 78 79static struct vmmdev_softc * 80vmmdev_lookup(const char *name) 81{ 82 struct vmmdev_softc *sc; 83 84#ifdef notyet /* XXX kernel is not compiled with invariants */ 85 mtx_assert(&vmmdev_mtx, MA_OWNED); 86#endif 87 88 SLIST_FOREACH(sc, &head, link) { 89 if (strcmp(name, vm_name(sc->vm)) == 0) 90 break; 91 } 92 93 return (sc); 94} 95 96static struct vmmdev_softc * 97vmmdev_lookup2(struct cdev *cdev) 98{ 99 100 return (cdev->si_drv1); 101} 102 103static int 104vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags) 105{ 106 int error, off, c, prot; 107 vm_paddr_t gpa; 108 void *hpa, *cookie; 109 struct vmmdev_softc *sc; 110 111 static char zerobuf[PAGE_SIZE]; 112 113 error = 0; 114 sc = vmmdev_lookup2(cdev); 115 if (sc == NULL) 116 error = ENXIO; 117 118 prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ); 119 while (uio->uio_resid > 0 && error == 0) { 120 gpa = uio->uio_offset; 121 off = gpa & PAGE_MASK; 122 c = min(uio->uio_resid, PAGE_SIZE - off); 123 124 /* 125 * The VM has a hole in its physical memory map. If we want to 126 * use 'dd' to inspect memory beyond the hole we need to 127 * provide bogus data for memory that lies in the hole. 128 * 129 * Since this device does not support lseek(2), dd(1) will 130 * read(2) blocks of data to simulate the lseek(2). 131 */ 132 hpa = vm_gpa_hold(sc->vm, gpa, c, prot, &cookie); 133 if (hpa == NULL) { 134 if (uio->uio_rw == UIO_READ) 135 error = uiomove(zerobuf, c, uio); 136 else 137 error = EFAULT; 138 } else { 139 error = uiomove(hpa, c, uio); 140 vm_gpa_release(cookie); 141 } 142 } 143 return (error); 144} 145 146static int 147vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag, 148 struct thread *td) 149{ 150 int error, vcpu, state_changed, size; 151 cpuset_t *cpuset; 152 struct vmmdev_softc *sc; 153 struct vm_memory_segment *seg; 154 struct vm_register *vmreg; 155 struct vm_seg_desc *vmsegdesc; 156 struct vm_run *vmrun; 157 struct vm_exception *vmexc; 158 struct vm_lapic_irq *vmirq; 159 struct vm_lapic_msi *vmmsi; 160 struct vm_ioapic_irq *ioapic_irq; 161 struct vm_isa_irq *isa_irq; 162 struct vm_isa_irq_trigger *isa_irq_trigger; 163 struct vm_capability *vmcap; 164 struct vm_pptdev *pptdev; 165 struct vm_pptdev_mmio *pptmmio; 166 struct vm_pptdev_msi *pptmsi; 167 struct vm_pptdev_msix *pptmsix; 168 struct vm_nmi *vmnmi; 169 struct vm_stats *vmstats; 170 struct vm_stat_desc *statdesc; 171 struct vm_x2apic *x2apic; 172 struct vm_gpa_pte *gpapte; 173 struct vm_suspend *vmsuspend; 174 struct vm_gla2gpa *gg; 175 struct vm_activate_cpu *vac; 176 struct vm_cpuset *vm_cpuset; 177 struct vm_intinfo *vmii; 178 struct vm_rtc_time *rtctime; 179 struct vm_rtc_data *rtcdata; 180 181 sc = vmmdev_lookup2(cdev); 182 if (sc == NULL) 183 return (ENXIO); 184 185 error = 0; 186 vcpu = -1; 187 state_changed = 0; 188 189 /* 190 * Some VMM ioctls can operate only on vcpus that are not running. 191 */ 192 switch (cmd) { 193 case VM_RUN: 194 case VM_GET_REGISTER: 195 case VM_SET_REGISTER: 196 case VM_GET_SEGMENT_DESCRIPTOR: 197 case VM_SET_SEGMENT_DESCRIPTOR: 198 case VM_INJECT_EXCEPTION: 199 case VM_GET_CAPABILITY: 200 case VM_SET_CAPABILITY: 201 case VM_PPTDEV_MSI: 202 case VM_PPTDEV_MSIX: 203 case VM_SET_X2APIC_STATE: 204 case VM_GLA2GPA: 205 case VM_ACTIVATE_CPU: 206 case VM_SET_INTINFO: 207 case VM_GET_INTINFO: 208 case VM_RESTART_INSTRUCTION: 209 /* 210 * XXX fragile, handle with care 211 * Assumes that the first field of the ioctl data is the vcpu. 212 */ 213 vcpu = *(int *)data; 214 if (vcpu < 0 || vcpu >= VM_MAXCPU) { 215 error = EINVAL; 216 goto done; 217 } 218 219 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 220 if (error) 221 goto done; 222 223 state_changed = 1; 224 break; 225 226 case VM_MAP_PPTDEV_MMIO: 227 case VM_BIND_PPTDEV: 228 case VM_UNBIND_PPTDEV: 229 case VM_MAP_MEMORY: 230 case VM_REINIT: 231 /* 232 * ioctls that operate on the entire virtual machine must 233 * prevent all vcpus from running. 234 */ 235 error = 0; 236 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) { 237 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 238 if (error) 239 break; 240 } 241 242 if (error) { 243 while (--vcpu >= 0) 244 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 245 goto done; 246 } 247 248 state_changed = 2; 249 break; 250 251 default: 252 break; 253 } 254 255 switch(cmd) { 256 case VM_RUN: 257 vmrun = (struct vm_run *)data; 258 error = vm_run(sc->vm, vmrun); 259 break; 260 case VM_SUSPEND: 261 vmsuspend = (struct vm_suspend *)data; 262 error = vm_suspend(sc->vm, vmsuspend->how); 263 break; 264 case VM_REINIT: 265 error = vm_reinit(sc->vm); 266 break; 267 case VM_STAT_DESC: { 268 statdesc = (struct vm_stat_desc *)data; 269 error = vmm_stat_desc_copy(statdesc->index, 270 statdesc->desc, sizeof(statdesc->desc)); 271 break; 272 } 273 case VM_STATS: { 274 CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS); 275 vmstats = (struct vm_stats *)data; 276 getmicrotime(&vmstats->tv); 277 error = vmm_stat_copy(sc->vm, vmstats->cpuid, 278 &vmstats->num_entries, vmstats->statbuf); 279 break; 280 } 281 case VM_PPTDEV_MSI: 282 pptmsi = (struct vm_pptdev_msi *)data; 283 error = ppt_setup_msi(sc->vm, pptmsi->vcpu, 284 pptmsi->bus, pptmsi->slot, pptmsi->func, 285 pptmsi->addr, pptmsi->msg, 286 pptmsi->numvec); 287 break; 288 case VM_PPTDEV_MSIX: 289 pptmsix = (struct vm_pptdev_msix *)data; 290 error = ppt_setup_msix(sc->vm, pptmsix->vcpu, 291 pptmsix->bus, pptmsix->slot, 292 pptmsix->func, pptmsix->idx, 293 pptmsix->addr, pptmsix->msg, 294 pptmsix->vector_control); 295 break; 296 case VM_MAP_PPTDEV_MMIO: 297 pptmmio = (struct vm_pptdev_mmio *)data; 298 error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot, 299 pptmmio->func, pptmmio->gpa, pptmmio->len, 300 pptmmio->hpa); 301 break; 302 case VM_BIND_PPTDEV: 303 pptdev = (struct vm_pptdev *)data; 304 error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 305 pptdev->func); 306 break; 307 case VM_UNBIND_PPTDEV: 308 pptdev = (struct vm_pptdev *)data; 309 error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 310 pptdev->func); 311 break; 312 case VM_INJECT_EXCEPTION: 313 vmexc = (struct vm_exception *)data; 314 error = vm_inject_exception(sc->vm, vmexc->cpuid, 315 vmexc->vector, vmexc->error_code_valid, vmexc->error_code, 316 vmexc->restart_instruction); 317 break; 318 case VM_INJECT_NMI: 319 vmnmi = (struct vm_nmi *)data; 320 error = vm_inject_nmi(sc->vm, vmnmi->cpuid); 321 break; 322 case VM_LAPIC_IRQ: 323 vmirq = (struct vm_lapic_irq *)data; 324 error = lapic_intr_edge(sc->vm, vmirq->cpuid, vmirq->vector); 325 break; 326 case VM_LAPIC_LOCAL_IRQ: 327 vmirq = (struct vm_lapic_irq *)data; 328 error = lapic_set_local_intr(sc->vm, vmirq->cpuid, 329 vmirq->vector); 330 break; 331 case VM_LAPIC_MSI: 332 vmmsi = (struct vm_lapic_msi *)data; 333 error = lapic_intr_msi(sc->vm, vmmsi->addr, vmmsi->msg); 334 break; 335 case VM_IOAPIC_ASSERT_IRQ: 336 ioapic_irq = (struct vm_ioapic_irq *)data; 337 error = vioapic_assert_irq(sc->vm, ioapic_irq->irq); 338 break; 339 case VM_IOAPIC_DEASSERT_IRQ: 340 ioapic_irq = (struct vm_ioapic_irq *)data; 341 error = vioapic_deassert_irq(sc->vm, ioapic_irq->irq); 342 break; 343 case VM_IOAPIC_PULSE_IRQ: 344 ioapic_irq = (struct vm_ioapic_irq *)data; 345 error = vioapic_pulse_irq(sc->vm, ioapic_irq->irq); 346 break; 347 case VM_IOAPIC_PINCOUNT: 348 *(int *)data = vioapic_pincount(sc->vm); 349 break; 350 case VM_ISA_ASSERT_IRQ: 351 isa_irq = (struct vm_isa_irq *)data; 352 error = vatpic_assert_irq(sc->vm, isa_irq->atpic_irq); 353 if (error == 0 && isa_irq->ioapic_irq != -1) 354 error = vioapic_assert_irq(sc->vm, 355 isa_irq->ioapic_irq); 356 break; 357 case VM_ISA_DEASSERT_IRQ: 358 isa_irq = (struct vm_isa_irq *)data; 359 error = vatpic_deassert_irq(sc->vm, isa_irq->atpic_irq); 360 if (error == 0 && isa_irq->ioapic_irq != -1) 361 error = vioapic_deassert_irq(sc->vm, 362 isa_irq->ioapic_irq); 363 break; 364 case VM_ISA_PULSE_IRQ: 365 isa_irq = (struct vm_isa_irq *)data; 366 error = vatpic_pulse_irq(sc->vm, isa_irq->atpic_irq); 367 if (error == 0 && isa_irq->ioapic_irq != -1) 368 error = vioapic_pulse_irq(sc->vm, isa_irq->ioapic_irq); 369 break; 370 case VM_ISA_SET_IRQ_TRIGGER: 371 isa_irq_trigger = (struct vm_isa_irq_trigger *)data; 372 error = vatpic_set_irq_trigger(sc->vm, 373 isa_irq_trigger->atpic_irq, isa_irq_trigger->trigger); 374 break; 375 case VM_MAP_MEMORY: 376 seg = (struct vm_memory_segment *)data; 377 error = vm_malloc(sc->vm, seg->gpa, seg->len); 378 break; 379 case VM_GET_MEMORY_SEG: 380 seg = (struct vm_memory_segment *)data; 381 seg->len = 0; 382 (void)vm_gpabase2memseg(sc->vm, seg->gpa, seg); 383 error = 0; 384 break; 385 case VM_GET_REGISTER: 386 vmreg = (struct vm_register *)data; 387 error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum, 388 &vmreg->regval); 389 break; 390 case VM_SET_REGISTER: 391 vmreg = (struct vm_register *)data; 392 error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum, 393 vmreg->regval); 394 break; 395 case VM_SET_SEGMENT_DESCRIPTOR: 396 vmsegdesc = (struct vm_seg_desc *)data; 397 error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid, 398 vmsegdesc->regnum, 399 &vmsegdesc->desc); 400 break; 401 case VM_GET_SEGMENT_DESCRIPTOR: 402 vmsegdesc = (struct vm_seg_desc *)data; 403 error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid, 404 vmsegdesc->regnum, 405 &vmsegdesc->desc); 406 break; 407 case VM_GET_CAPABILITY: 408 vmcap = (struct vm_capability *)data; 409 error = vm_get_capability(sc->vm, vmcap->cpuid, 410 vmcap->captype, 411 &vmcap->capval); 412 break; 413 case VM_SET_CAPABILITY: 414 vmcap = (struct vm_capability *)data; 415 error = vm_set_capability(sc->vm, vmcap->cpuid, 416 vmcap->captype, 417 vmcap->capval); 418 break; 419 case VM_SET_X2APIC_STATE: 420 x2apic = (struct vm_x2apic *)data; 421 error = vm_set_x2apic_state(sc->vm, 422 x2apic->cpuid, x2apic->state); 423 break; 424 case VM_GET_X2APIC_STATE: 425 x2apic = (struct vm_x2apic *)data; 426 error = vm_get_x2apic_state(sc->vm, 427 x2apic->cpuid, &x2apic->state); 428 break; 429 case VM_GET_GPA_PMAP: 430 gpapte = (struct vm_gpa_pte *)data; 431 pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)), 432 gpapte->gpa, gpapte->pte, &gpapte->ptenum); 433 error = 0; 434 break; 435 case VM_GET_HPET_CAPABILITIES: 436 error = vhpet_getcap((struct vm_hpet_cap *)data); 437 break; 438 case VM_GLA2GPA: { 439 CTASSERT(PROT_READ == VM_PROT_READ); 440 CTASSERT(PROT_WRITE == VM_PROT_WRITE); 441 CTASSERT(PROT_EXEC == VM_PROT_EXECUTE); 442 gg = (struct vm_gla2gpa *)data; 443 error = vmm_gla2gpa(sc->vm, gg->vcpuid, &gg->paging, gg->gla, 444 gg->prot, &gg->gpa); 445 KASSERT(error == 0 || error == 1 || error == -1, 446 ("%s: vmm_gla2gpa unknown error %d", __func__, error)); 447 if (error >= 0) { 448 /* 449 * error = 0: the translation was successful 450 * error = 1: a fault was injected into the guest 451 */ 452 gg->fault = error; 453 error = 0; 454 } else { 455 error = EFAULT; 456 } 457 break; 458 } 459 case VM_ACTIVATE_CPU: 460 vac = (struct vm_activate_cpu *)data; 461 error = vm_activate_cpu(sc->vm, vac->vcpuid); 462 break; 463 case VM_GET_CPUS: 464 error = 0; 465 vm_cpuset = (struct vm_cpuset *)data; 466 size = vm_cpuset->cpusetsize; 467 if (size < sizeof(cpuset_t) || size > CPU_MAXSIZE / NBBY) { 468 error = ERANGE; 469 break; 470 } 471 cpuset = malloc(size, M_TEMP, M_WAITOK | M_ZERO); 472 if (vm_cpuset->which == VM_ACTIVE_CPUS) 473 *cpuset = vm_active_cpus(sc->vm); 474 else if (vm_cpuset->which == VM_SUSPENDED_CPUS) 475 *cpuset = vm_suspended_cpus(sc->vm); 476 else 477 error = EINVAL; 478 if (error == 0) 479 error = copyout(cpuset, vm_cpuset->cpus, size); 480 free(cpuset, M_TEMP); 481 break; 482 case VM_SET_INTINFO: 483 vmii = (struct vm_intinfo *)data; 484 error = vm_exit_intinfo(sc->vm, vmii->vcpuid, vmii->info1); 485 break; 486 case VM_GET_INTINFO: 487 vmii = (struct vm_intinfo *)data; 488 error = vm_get_intinfo(sc->vm, vmii->vcpuid, &vmii->info1, 489 &vmii->info2); 490 break; 491 case VM_RTC_WRITE: 492 rtcdata = (struct vm_rtc_data *)data; 493 error = vrtc_nvram_write(sc->vm, rtcdata->offset, 494 rtcdata->value); 495 break; 496 case VM_RTC_READ: 497 rtcdata = (struct vm_rtc_data *)data; 498 error = vrtc_nvram_read(sc->vm, rtcdata->offset, 499 &rtcdata->value); 500 break; 501 case VM_RTC_SETTIME: 502 rtctime = (struct vm_rtc_time *)data; 503 error = vrtc_set_time(sc->vm, rtctime->secs); 504 break; 505 case VM_RTC_GETTIME: 506 error = 0; 507 rtctime = (struct vm_rtc_time *)data; 508 rtctime->secs = vrtc_get_time(sc->vm); 509 break; 510 case VM_RESTART_INSTRUCTION: 511 error = vm_restart_instruction(sc->vm, vcpu); 512 break; 513 default: 514 error = ENOTTY; 515 break; 516 } 517 518 if (state_changed == 1) { 519 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 520 } else if (state_changed == 2) { 521 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) 522 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 523 } 524 525done: 526 /* Make sure that no handler returns a bogus value like ERESTART */ 527 KASSERT(error >= 0, ("vmmdev_ioctl: invalid error return %d", error)); 528 return (error); 529} 530 531static int 532vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, 533 vm_size_t size, struct vm_object **object, int nprot) 534{ 535 int error; 536 struct vmmdev_softc *sc; 537 538 sc = vmmdev_lookup2(cdev); 539 if (sc != NULL && (nprot & PROT_EXEC) == 0) 540 error = vm_get_memobj(sc->vm, *offset, size, offset, object); 541 else 542 error = EINVAL; 543 544 return (error); 545} 546 547static void 548vmmdev_destroy(void *arg) 549{ 550 551 struct vmmdev_softc *sc = arg; 552 553 if (sc->cdev != NULL) 554 destroy_dev(sc->cdev); 555 556 if (sc->vm != NULL) 557 vm_destroy(sc->vm); 558 559 if ((sc->flags & VSC_LINKED) != 0) { 560 mtx_lock(&vmmdev_mtx); 561 SLIST_REMOVE(&head, sc, vmmdev_softc, link); 562 mtx_unlock(&vmmdev_mtx); 563 } 564 565 free(sc, M_VMMDEV); 566} 567 568static int 569sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS) 570{ 571 int error; 572 char buf[VM_MAX_NAMELEN]; 573 struct vmmdev_softc *sc; 574 struct cdev *cdev; 575 576 strlcpy(buf, "beavis", sizeof(buf)); 577 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 578 if (error != 0 || req->newptr == NULL) 579 return (error); 580 581 mtx_lock(&vmmdev_mtx); 582 sc = vmmdev_lookup(buf); 583 if (sc == NULL || sc->cdev == NULL) { 584 mtx_unlock(&vmmdev_mtx); 585 return (EINVAL); 586 } 587 588 /* 589 * The 'cdev' will be destroyed asynchronously when 'si_threadcount' 590 * goes down to 0 so we should not do it again in the callback. 591 */ 592 cdev = sc->cdev; 593 sc->cdev = NULL; 594 mtx_unlock(&vmmdev_mtx); 595 596 /* 597 * Schedule the 'cdev' to be destroyed: 598 * 599 * - any new operations on this 'cdev' will return an error (ENXIO). 600 * 601 * - when the 'si_threadcount' dwindles down to zero the 'cdev' will 602 * be destroyed and the callback will be invoked in a taskqueue 603 * context. 604 */ 605 destroy_dev_sched_cb(cdev, vmmdev_destroy, sc); 606 607 return (0); 608} 609SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW, 610 NULL, 0, sysctl_vmm_destroy, "A", NULL); 611 612static struct cdevsw vmmdevsw = { 613 .d_name = "vmmdev", 614 .d_version = D_VERSION, 615 .d_ioctl = vmmdev_ioctl, 616 .d_mmap_single = vmmdev_mmap_single, 617 .d_read = vmmdev_rw, 618 .d_write = vmmdev_rw, 619}; 620 621static int 622sysctl_vmm_create(SYSCTL_HANDLER_ARGS) 623{ 624 int error; 625 struct vm *vm; 626 struct cdev *cdev; 627 struct vmmdev_softc *sc, *sc2; 628 char buf[VM_MAX_NAMELEN]; 629 630 strlcpy(buf, "beavis", sizeof(buf)); 631 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 632 if (error != 0 || req->newptr == NULL) 633 return (error); 634 635 mtx_lock(&vmmdev_mtx); 636 sc = vmmdev_lookup(buf); 637 mtx_unlock(&vmmdev_mtx); 638 if (sc != NULL) 639 return (EEXIST); 640 641 error = vm_create(buf, &vm); 642 if (error != 0) 643 return (error); 644 645 sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO); 646 sc->vm = vm; 647 648 /* 649 * Lookup the name again just in case somebody sneaked in when we 650 * dropped the lock. 651 */ 652 mtx_lock(&vmmdev_mtx); 653 sc2 = vmmdev_lookup(buf); 654 if (sc2 == NULL) { 655 SLIST_INSERT_HEAD(&head, sc, link); 656 sc->flags |= VSC_LINKED; 657 } 658 mtx_unlock(&vmmdev_mtx); 659 660 if (sc2 != NULL) { 661 vmmdev_destroy(sc); 662 return (EEXIST); 663 } 664 665 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL, 666 UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf); 667 if (error != 0) { 668 vmmdev_destroy(sc); 669 return (error); 670 } 671 672 mtx_lock(&vmmdev_mtx); 673 sc->cdev = cdev; 674 sc->cdev->si_drv1 = sc; 675 mtx_unlock(&vmmdev_mtx); 676 677 return (0); 678} 679SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW, 680 NULL, 0, sysctl_vmm_create, "A", NULL); 681 682void 683vmmdev_init(void) 684{ 685 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF); 686} 687 688int 689vmmdev_cleanup(void) 690{ 691 int error; 692 693 if (SLIST_EMPTY(&head)) 694 error = 0; 695 else 696 error = EBUSY; 697 698 return (error); 699} 700