vmm_dev.c revision 270159
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 270159 2014-08-19 01:20:24Z grehan $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_dev.c 270159 2014-08-19 01:20:24Z grehan $"); 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 62struct vmmdev_softc { 63 struct vm *vm; /* vm instance cookie */ 64 struct cdev *cdev; 65 SLIST_ENTRY(vmmdev_softc) link; 66 int flags; 67}; 68#define VSC_LINKED 0x01 69 70static SLIST_HEAD(, vmmdev_softc) head; 71 72static struct mtx vmmdev_mtx; 73 74static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev"); 75 76SYSCTL_DECL(_hw_vmm); 77 78static struct vmmdev_softc * 79vmmdev_lookup(const char *name) 80{ 81 struct vmmdev_softc *sc; 82 83#ifdef notyet /* XXX kernel is not compiled with invariants */ 84 mtx_assert(&vmmdev_mtx, MA_OWNED); 85#endif 86 87 SLIST_FOREACH(sc, &head, link) { 88 if (strcmp(name, vm_name(sc->vm)) == 0) 89 break; 90 } 91 92 return (sc); 93} 94 95static struct vmmdev_softc * 96vmmdev_lookup2(struct cdev *cdev) 97{ 98 99 return (cdev->si_drv1); 100} 101 102static int 103vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags) 104{ 105 int error, off, c, prot; 106 vm_paddr_t gpa; 107 void *hpa, *cookie; 108 struct vmmdev_softc *sc; 109 110 static char zerobuf[PAGE_SIZE]; 111 112 error = 0; 113 sc = vmmdev_lookup2(cdev); 114 if (sc == NULL) 115 error = ENXIO; 116 117 prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ); 118 while (uio->uio_resid > 0 && error == 0) { 119 gpa = uio->uio_offset; 120 off = gpa & PAGE_MASK; 121 c = min(uio->uio_resid, PAGE_SIZE - off); 122 123 /* 124 * The VM has a hole in its physical memory map. If we want to 125 * use 'dd' to inspect memory beyond the hole we need to 126 * provide bogus data for memory that lies in the hole. 127 * 128 * Since this device does not support lseek(2), dd(1) will 129 * read(2) blocks of data to simulate the lseek(2). 130 */ 131 hpa = vm_gpa_hold(sc->vm, gpa, c, prot, &cookie); 132 if (hpa == NULL) { 133 if (uio->uio_rw == UIO_READ) 134 error = uiomove(zerobuf, c, uio); 135 else 136 error = EFAULT; 137 } else { 138 error = uiomove(hpa, c, uio); 139 vm_gpa_release(cookie); 140 } 141 } 142 return (error); 143} 144 145static int 146vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag, 147 struct thread *td) 148{ 149 int error, vcpu, state_changed, size; 150 cpuset_t *cpuset; 151 struct vmmdev_softc *sc; 152 struct vm_memory_segment *seg; 153 struct vm_register *vmreg; 154 struct vm_seg_desc *vmsegdesc; 155 struct vm_run *vmrun; 156 struct vm_exception *vmexc; 157 struct vm_lapic_irq *vmirq; 158 struct vm_lapic_msi *vmmsi; 159 struct vm_ioapic_irq *ioapic_irq; 160 struct vm_isa_irq *isa_irq; 161 struct vm_isa_irq_trigger *isa_irq_trigger; 162 struct vm_capability *vmcap; 163 struct vm_pptdev *pptdev; 164 struct vm_pptdev_mmio *pptmmio; 165 struct vm_pptdev_msi *pptmsi; 166 struct vm_pptdev_msix *pptmsix; 167 struct vm_nmi *vmnmi; 168 struct vm_stats *vmstats; 169 struct vm_stat_desc *statdesc; 170 struct vm_x2apic *x2apic; 171 struct vm_gpa_pte *gpapte; 172 struct vm_suspend *vmsuspend; 173 struct vm_gla2gpa *gg; 174 struct vm_activate_cpu *vac; 175 struct vm_cpuset *vm_cpuset; 176 struct vm_intinfo *vmii; 177 178 sc = vmmdev_lookup2(cdev); 179 if (sc == NULL) 180 return (ENXIO); 181 182 error = 0; 183 vcpu = -1; 184 state_changed = 0; 185 186 /* 187 * Some VMM ioctls can operate only on vcpus that are not running. 188 */ 189 switch (cmd) { 190 case VM_RUN: 191 case VM_GET_REGISTER: 192 case VM_SET_REGISTER: 193 case VM_GET_SEGMENT_DESCRIPTOR: 194 case VM_SET_SEGMENT_DESCRIPTOR: 195 case VM_INJECT_EXCEPTION: 196 case VM_GET_CAPABILITY: 197 case VM_SET_CAPABILITY: 198 case VM_PPTDEV_MSI: 199 case VM_PPTDEV_MSIX: 200 case VM_SET_X2APIC_STATE: 201 case VM_GLA2GPA: 202 case VM_ACTIVATE_CPU: 203 case VM_SET_INTINFO: 204 case VM_GET_INTINFO: 205 /* 206 * XXX fragile, handle with care 207 * Assumes that the first field of the ioctl data is the vcpu. 208 */ 209 vcpu = *(int *)data; 210 if (vcpu < 0 || vcpu >= VM_MAXCPU) { 211 error = EINVAL; 212 goto done; 213 } 214 215 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 216 if (error) 217 goto done; 218 219 state_changed = 1; 220 break; 221 222 case VM_MAP_PPTDEV_MMIO: 223 case VM_BIND_PPTDEV: 224 case VM_UNBIND_PPTDEV: 225 case VM_MAP_MEMORY: 226 case VM_REINIT: 227 /* 228 * ioctls that operate on the entire virtual machine must 229 * prevent all vcpus from running. 230 */ 231 error = 0; 232 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) { 233 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 234 if (error) 235 break; 236 } 237 238 if (error) { 239 while (--vcpu >= 0) 240 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 241 goto done; 242 } 243 244 state_changed = 2; 245 break; 246 247 default: 248 break; 249 } 250 251 switch(cmd) { 252 case VM_RUN: 253 vmrun = (struct vm_run *)data; 254 error = vm_run(sc->vm, vmrun); 255 break; 256 case VM_SUSPEND: 257 vmsuspend = (struct vm_suspend *)data; 258 error = vm_suspend(sc->vm, vmsuspend->how); 259 break; 260 case VM_REINIT: 261 error = vm_reinit(sc->vm); 262 break; 263 case VM_STAT_DESC: { 264 statdesc = (struct vm_stat_desc *)data; 265 error = vmm_stat_desc_copy(statdesc->index, 266 statdesc->desc, sizeof(statdesc->desc)); 267 break; 268 } 269 case VM_STATS: { 270 CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS); 271 vmstats = (struct vm_stats *)data; 272 getmicrotime(&vmstats->tv); 273 error = vmm_stat_copy(sc->vm, vmstats->cpuid, 274 &vmstats->num_entries, vmstats->statbuf); 275 break; 276 } 277 case VM_PPTDEV_MSI: 278 pptmsi = (struct vm_pptdev_msi *)data; 279 error = ppt_setup_msi(sc->vm, pptmsi->vcpu, 280 pptmsi->bus, pptmsi->slot, pptmsi->func, 281 pptmsi->addr, pptmsi->msg, 282 pptmsi->numvec); 283 break; 284 case VM_PPTDEV_MSIX: 285 pptmsix = (struct vm_pptdev_msix *)data; 286 error = ppt_setup_msix(sc->vm, pptmsix->vcpu, 287 pptmsix->bus, pptmsix->slot, 288 pptmsix->func, pptmsix->idx, 289 pptmsix->addr, pptmsix->msg, 290 pptmsix->vector_control); 291 break; 292 case VM_MAP_PPTDEV_MMIO: 293 pptmmio = (struct vm_pptdev_mmio *)data; 294 error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot, 295 pptmmio->func, pptmmio->gpa, pptmmio->len, 296 pptmmio->hpa); 297 break; 298 case VM_BIND_PPTDEV: 299 pptdev = (struct vm_pptdev *)data; 300 error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 301 pptdev->func); 302 break; 303 case VM_UNBIND_PPTDEV: 304 pptdev = (struct vm_pptdev *)data; 305 error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 306 pptdev->func); 307 break; 308 case VM_INJECT_EXCEPTION: 309 vmexc = (struct vm_exception *)data; 310 error = vm_inject_exception(sc->vm, vmexc->cpuid, vmexc); 311 break; 312 case VM_INJECT_NMI: 313 vmnmi = (struct vm_nmi *)data; 314 error = vm_inject_nmi(sc->vm, vmnmi->cpuid); 315 break; 316 case VM_LAPIC_IRQ: 317 vmirq = (struct vm_lapic_irq *)data; 318 error = lapic_intr_edge(sc->vm, vmirq->cpuid, vmirq->vector); 319 break; 320 case VM_LAPIC_LOCAL_IRQ: 321 vmirq = (struct vm_lapic_irq *)data; 322 error = lapic_set_local_intr(sc->vm, vmirq->cpuid, 323 vmirq->vector); 324 break; 325 case VM_LAPIC_MSI: 326 vmmsi = (struct vm_lapic_msi *)data; 327 error = lapic_intr_msi(sc->vm, vmmsi->addr, vmmsi->msg); 328 break; 329 case VM_IOAPIC_ASSERT_IRQ: 330 ioapic_irq = (struct vm_ioapic_irq *)data; 331 error = vioapic_assert_irq(sc->vm, ioapic_irq->irq); 332 break; 333 case VM_IOAPIC_DEASSERT_IRQ: 334 ioapic_irq = (struct vm_ioapic_irq *)data; 335 error = vioapic_deassert_irq(sc->vm, ioapic_irq->irq); 336 break; 337 case VM_IOAPIC_PULSE_IRQ: 338 ioapic_irq = (struct vm_ioapic_irq *)data; 339 error = vioapic_pulse_irq(sc->vm, ioapic_irq->irq); 340 break; 341 case VM_IOAPIC_PINCOUNT: 342 *(int *)data = vioapic_pincount(sc->vm); 343 break; 344 case VM_ISA_ASSERT_IRQ: 345 isa_irq = (struct vm_isa_irq *)data; 346 error = vatpic_assert_irq(sc->vm, isa_irq->atpic_irq); 347 if (error == 0 && isa_irq->ioapic_irq != -1) 348 error = vioapic_assert_irq(sc->vm, 349 isa_irq->ioapic_irq); 350 break; 351 case VM_ISA_DEASSERT_IRQ: 352 isa_irq = (struct vm_isa_irq *)data; 353 error = vatpic_deassert_irq(sc->vm, isa_irq->atpic_irq); 354 if (error == 0 && isa_irq->ioapic_irq != -1) 355 error = vioapic_deassert_irq(sc->vm, 356 isa_irq->ioapic_irq); 357 break; 358 case VM_ISA_PULSE_IRQ: 359 isa_irq = (struct vm_isa_irq *)data; 360 error = vatpic_pulse_irq(sc->vm, isa_irq->atpic_irq); 361 if (error == 0 && isa_irq->ioapic_irq != -1) 362 error = vioapic_pulse_irq(sc->vm, isa_irq->ioapic_irq); 363 break; 364 case VM_ISA_SET_IRQ_TRIGGER: 365 isa_irq_trigger = (struct vm_isa_irq_trigger *)data; 366 error = vatpic_set_irq_trigger(sc->vm, 367 isa_irq_trigger->atpic_irq, isa_irq_trigger->trigger); 368 break; 369 case VM_MAP_MEMORY: 370 seg = (struct vm_memory_segment *)data; 371 error = vm_malloc(sc->vm, seg->gpa, seg->len); 372 break; 373 case VM_GET_MEMORY_SEG: 374 seg = (struct vm_memory_segment *)data; 375 seg->len = 0; 376 (void)vm_gpabase2memseg(sc->vm, seg->gpa, seg); 377 error = 0; 378 break; 379 case VM_GET_REGISTER: 380 vmreg = (struct vm_register *)data; 381 error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum, 382 &vmreg->regval); 383 break; 384 case VM_SET_REGISTER: 385 vmreg = (struct vm_register *)data; 386 error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum, 387 vmreg->regval); 388 break; 389 case VM_SET_SEGMENT_DESCRIPTOR: 390 vmsegdesc = (struct vm_seg_desc *)data; 391 error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid, 392 vmsegdesc->regnum, 393 &vmsegdesc->desc); 394 break; 395 case VM_GET_SEGMENT_DESCRIPTOR: 396 vmsegdesc = (struct vm_seg_desc *)data; 397 error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid, 398 vmsegdesc->regnum, 399 &vmsegdesc->desc); 400 break; 401 case VM_GET_CAPABILITY: 402 vmcap = (struct vm_capability *)data; 403 error = vm_get_capability(sc->vm, vmcap->cpuid, 404 vmcap->captype, 405 &vmcap->capval); 406 break; 407 case VM_SET_CAPABILITY: 408 vmcap = (struct vm_capability *)data; 409 error = vm_set_capability(sc->vm, vmcap->cpuid, 410 vmcap->captype, 411 vmcap->capval); 412 break; 413 case VM_SET_X2APIC_STATE: 414 x2apic = (struct vm_x2apic *)data; 415 error = vm_set_x2apic_state(sc->vm, 416 x2apic->cpuid, x2apic->state); 417 break; 418 case VM_GET_X2APIC_STATE: 419 x2apic = (struct vm_x2apic *)data; 420 error = vm_get_x2apic_state(sc->vm, 421 x2apic->cpuid, &x2apic->state); 422 break; 423 case VM_GET_GPA_PMAP: 424 gpapte = (struct vm_gpa_pte *)data; 425 pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)), 426 gpapte->gpa, gpapte->pte, &gpapte->ptenum); 427 error = 0; 428 break; 429 case VM_GET_HPET_CAPABILITIES: 430 error = vhpet_getcap((struct vm_hpet_cap *)data); 431 break; 432 case VM_GLA2GPA: { 433 CTASSERT(PROT_READ == VM_PROT_READ); 434 CTASSERT(PROT_WRITE == VM_PROT_WRITE); 435 CTASSERT(PROT_EXEC == VM_PROT_EXECUTE); 436 gg = (struct vm_gla2gpa *)data; 437 error = vmm_gla2gpa(sc->vm, gg->vcpuid, &gg->paging, gg->gla, 438 gg->prot, &gg->gpa); 439 KASSERT(error == 0 || error == 1 || error == -1, 440 ("%s: vmm_gla2gpa unknown error %d", __func__, error)); 441 if (error >= 0) { 442 /* 443 * error = 0: the translation was successful 444 * error = 1: a fault was injected into the guest 445 */ 446 gg->fault = error; 447 error = 0; 448 } else { 449 error = EFAULT; 450 } 451 break; 452 } 453 case VM_ACTIVATE_CPU: 454 vac = (struct vm_activate_cpu *)data; 455 error = vm_activate_cpu(sc->vm, vac->vcpuid); 456 break; 457 case VM_GET_CPUS: 458 error = 0; 459 vm_cpuset = (struct vm_cpuset *)data; 460 size = vm_cpuset->cpusetsize; 461 if (size < sizeof(cpuset_t) || size > CPU_MAXSIZE / NBBY) { 462 error = ERANGE; 463 break; 464 } 465 cpuset = malloc(size, M_TEMP, M_WAITOK | M_ZERO); 466 if (vm_cpuset->which == VM_ACTIVE_CPUS) 467 *cpuset = vm_active_cpus(sc->vm); 468 else if (vm_cpuset->which == VM_SUSPENDED_CPUS) 469 *cpuset = vm_suspended_cpus(sc->vm); 470 else 471 error = EINVAL; 472 if (error == 0) 473 error = copyout(cpuset, vm_cpuset->cpus, size); 474 free(cpuset, M_TEMP); 475 break; 476 case VM_SET_INTINFO: 477 vmii = (struct vm_intinfo *)data; 478 error = vm_exit_intinfo(sc->vm, vmii->vcpuid, vmii->info1); 479 break; 480 case VM_GET_INTINFO: 481 vmii = (struct vm_intinfo *)data; 482 error = vm_get_intinfo(sc->vm, vmii->vcpuid, &vmii->info1, 483 &vmii->info2); 484 break; 485 default: 486 error = ENOTTY; 487 break; 488 } 489 490 if (state_changed == 1) { 491 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 492 } else if (state_changed == 2) { 493 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) 494 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 495 } 496 497done: 498 /* Make sure that no handler returns a bogus value like ERESTART */ 499 KASSERT(error >= 0, ("vmmdev_ioctl: invalid error return %d", error)); 500 return (error); 501} 502 503static int 504vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, 505 vm_size_t size, struct vm_object **object, int nprot) 506{ 507 int error; 508 struct vmmdev_softc *sc; 509 510 sc = vmmdev_lookup2(cdev); 511 if (sc != NULL && (nprot & PROT_EXEC) == 0) 512 error = vm_get_memobj(sc->vm, *offset, size, offset, object); 513 else 514 error = EINVAL; 515 516 return (error); 517} 518 519static void 520vmmdev_destroy(void *arg) 521{ 522 523 struct vmmdev_softc *sc = arg; 524 525 if (sc->cdev != NULL) 526 destroy_dev(sc->cdev); 527 528 if (sc->vm != NULL) 529 vm_destroy(sc->vm); 530 531 if ((sc->flags & VSC_LINKED) != 0) { 532 mtx_lock(&vmmdev_mtx); 533 SLIST_REMOVE(&head, sc, vmmdev_softc, link); 534 mtx_unlock(&vmmdev_mtx); 535 } 536 537 free(sc, M_VMMDEV); 538} 539 540static int 541sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS) 542{ 543 int error; 544 char buf[VM_MAX_NAMELEN]; 545 struct vmmdev_softc *sc; 546 struct cdev *cdev; 547 548 strlcpy(buf, "beavis", sizeof(buf)); 549 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 550 if (error != 0 || req->newptr == NULL) 551 return (error); 552 553 mtx_lock(&vmmdev_mtx); 554 sc = vmmdev_lookup(buf); 555 if (sc == NULL || sc->cdev == NULL) { 556 mtx_unlock(&vmmdev_mtx); 557 return (EINVAL); 558 } 559 560 /* 561 * The 'cdev' will be destroyed asynchronously when 'si_threadcount' 562 * goes down to 0 so we should not do it again in the callback. 563 */ 564 cdev = sc->cdev; 565 sc->cdev = NULL; 566 mtx_unlock(&vmmdev_mtx); 567 568 /* 569 * Schedule the 'cdev' to be destroyed: 570 * 571 * - any new operations on this 'cdev' will return an error (ENXIO). 572 * 573 * - when the 'si_threadcount' dwindles down to zero the 'cdev' will 574 * be destroyed and the callback will be invoked in a taskqueue 575 * context. 576 */ 577 destroy_dev_sched_cb(cdev, vmmdev_destroy, sc); 578 579 return (0); 580} 581SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW, 582 NULL, 0, sysctl_vmm_destroy, "A", NULL); 583 584static struct cdevsw vmmdevsw = { 585 .d_name = "vmmdev", 586 .d_version = D_VERSION, 587 .d_ioctl = vmmdev_ioctl, 588 .d_mmap_single = vmmdev_mmap_single, 589 .d_read = vmmdev_rw, 590 .d_write = vmmdev_rw, 591}; 592 593static int 594sysctl_vmm_create(SYSCTL_HANDLER_ARGS) 595{ 596 int error; 597 struct vm *vm; 598 struct cdev *cdev; 599 struct vmmdev_softc *sc, *sc2; 600 char buf[VM_MAX_NAMELEN]; 601 602 strlcpy(buf, "beavis", sizeof(buf)); 603 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 604 if (error != 0 || req->newptr == NULL) 605 return (error); 606 607 mtx_lock(&vmmdev_mtx); 608 sc = vmmdev_lookup(buf); 609 mtx_unlock(&vmmdev_mtx); 610 if (sc != NULL) 611 return (EEXIST); 612 613 error = vm_create(buf, &vm); 614 if (error != 0) 615 return (error); 616 617 sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO); 618 sc->vm = vm; 619 620 /* 621 * Lookup the name again just in case somebody sneaked in when we 622 * dropped the lock. 623 */ 624 mtx_lock(&vmmdev_mtx); 625 sc2 = vmmdev_lookup(buf); 626 if (sc2 == NULL) { 627 SLIST_INSERT_HEAD(&head, sc, link); 628 sc->flags |= VSC_LINKED; 629 } 630 mtx_unlock(&vmmdev_mtx); 631 632 if (sc2 != NULL) { 633 vmmdev_destroy(sc); 634 return (EEXIST); 635 } 636 637 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL, 638 UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf); 639 if (error != 0) { 640 vmmdev_destroy(sc); 641 return (error); 642 } 643 644 mtx_lock(&vmmdev_mtx); 645 sc->cdev = cdev; 646 sc->cdev->si_drv1 = sc; 647 mtx_unlock(&vmmdev_mtx); 648 649 return (0); 650} 651SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW, 652 NULL, 0, sysctl_vmm_create, "A", NULL); 653 654void 655vmmdev_init(void) 656{ 657 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF); 658} 659 660int 661vmmdev_cleanup(void) 662{ 663 int error; 664 665 if (SLIST_EMPTY(&head)) 666 error = 0; 667 else 668 error = EBUSY; 669 670 return (error); 671} 672