vmm_dev.c revision 270070
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 270070 2014-08-17 00:52:07Z grehan $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_dev.c 270070 2014-08-17 00:52:07Z 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; 176 177 sc = vmmdev_lookup2(cdev); 178 if (sc == NULL) 179 return (ENXIO); 180 181 error = 0; 182 vcpu = -1; 183 state_changed = 0; 184 185 /* 186 * Some VMM ioctls can operate only on vcpus that are not running. 187 */ 188 switch (cmd) { 189 case VM_RUN: 190 case VM_GET_REGISTER: 191 case VM_SET_REGISTER: 192 case VM_GET_SEGMENT_DESCRIPTOR: 193 case VM_SET_SEGMENT_DESCRIPTOR: 194 case VM_INJECT_EXCEPTION: 195 case VM_GET_CAPABILITY: 196 case VM_SET_CAPABILITY: 197 case VM_PPTDEV_MSI: 198 case VM_PPTDEV_MSIX: 199 case VM_SET_X2APIC_STATE: 200 case VM_GLA2GPA: 201 case VM_ACTIVATE_CPU: 202 /* 203 * XXX fragile, handle with care 204 * Assumes that the first field of the ioctl data is the vcpu. 205 */ 206 vcpu = *(int *)data; 207 if (vcpu < 0 || vcpu >= VM_MAXCPU) { 208 error = EINVAL; 209 goto done; 210 } 211 212 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 213 if (error) 214 goto done; 215 216 state_changed = 1; 217 break; 218 219 case VM_MAP_PPTDEV_MMIO: 220 case VM_BIND_PPTDEV: 221 case VM_UNBIND_PPTDEV: 222 case VM_MAP_MEMORY: 223 /* 224 * ioctls that operate on the entire virtual machine must 225 * prevent all vcpus from running. 226 */ 227 error = 0; 228 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) { 229 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 230 if (error) 231 break; 232 } 233 234 if (error) { 235 while (--vcpu >= 0) 236 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 237 goto done; 238 } 239 240 state_changed = 2; 241 break; 242 243 default: 244 break; 245 } 246 247 switch(cmd) { 248 case VM_RUN: 249 vmrun = (struct vm_run *)data; 250 error = vm_run(sc->vm, vmrun); 251 break; 252 case VM_SUSPEND: 253 vmsuspend = (struct vm_suspend *)data; 254 error = vm_suspend(sc->vm, vmsuspend->how); 255 break; 256 case VM_STAT_DESC: { 257 statdesc = (struct vm_stat_desc *)data; 258 error = vmm_stat_desc_copy(statdesc->index, 259 statdesc->desc, sizeof(statdesc->desc)); 260 break; 261 } 262 case VM_STATS: { 263 CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS); 264 vmstats = (struct vm_stats *)data; 265 getmicrotime(&vmstats->tv); 266 error = vmm_stat_copy(sc->vm, vmstats->cpuid, 267 &vmstats->num_entries, vmstats->statbuf); 268 break; 269 } 270 case VM_PPTDEV_MSI: 271 pptmsi = (struct vm_pptdev_msi *)data; 272 error = ppt_setup_msi(sc->vm, pptmsi->vcpu, 273 pptmsi->bus, pptmsi->slot, pptmsi->func, 274 pptmsi->addr, pptmsi->msg, 275 pptmsi->numvec); 276 break; 277 case VM_PPTDEV_MSIX: 278 pptmsix = (struct vm_pptdev_msix *)data; 279 error = ppt_setup_msix(sc->vm, pptmsix->vcpu, 280 pptmsix->bus, pptmsix->slot, 281 pptmsix->func, pptmsix->idx, 282 pptmsix->addr, pptmsix->msg, 283 pptmsix->vector_control); 284 break; 285 case VM_MAP_PPTDEV_MMIO: 286 pptmmio = (struct vm_pptdev_mmio *)data; 287 error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot, 288 pptmmio->func, pptmmio->gpa, pptmmio->len, 289 pptmmio->hpa); 290 break; 291 case VM_BIND_PPTDEV: 292 pptdev = (struct vm_pptdev *)data; 293 error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 294 pptdev->func); 295 break; 296 case VM_UNBIND_PPTDEV: 297 pptdev = (struct vm_pptdev *)data; 298 error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 299 pptdev->func); 300 break; 301 case VM_INJECT_EXCEPTION: 302 vmexc = (struct vm_exception *)data; 303 error = vm_inject_exception(sc->vm, vmexc->cpuid, vmexc); 304 break; 305 case VM_INJECT_NMI: 306 vmnmi = (struct vm_nmi *)data; 307 error = vm_inject_nmi(sc->vm, vmnmi->cpuid); 308 break; 309 case VM_LAPIC_IRQ: 310 vmirq = (struct vm_lapic_irq *)data; 311 error = lapic_intr_edge(sc->vm, vmirq->cpuid, vmirq->vector); 312 break; 313 case VM_LAPIC_LOCAL_IRQ: 314 vmirq = (struct vm_lapic_irq *)data; 315 error = lapic_set_local_intr(sc->vm, vmirq->cpuid, 316 vmirq->vector); 317 break; 318 case VM_LAPIC_MSI: 319 vmmsi = (struct vm_lapic_msi *)data; 320 error = lapic_intr_msi(sc->vm, vmmsi->addr, vmmsi->msg); 321 break; 322 case VM_IOAPIC_ASSERT_IRQ: 323 ioapic_irq = (struct vm_ioapic_irq *)data; 324 error = vioapic_assert_irq(sc->vm, ioapic_irq->irq); 325 break; 326 case VM_IOAPIC_DEASSERT_IRQ: 327 ioapic_irq = (struct vm_ioapic_irq *)data; 328 error = vioapic_deassert_irq(sc->vm, ioapic_irq->irq); 329 break; 330 case VM_IOAPIC_PULSE_IRQ: 331 ioapic_irq = (struct vm_ioapic_irq *)data; 332 error = vioapic_pulse_irq(sc->vm, ioapic_irq->irq); 333 break; 334 case VM_IOAPIC_PINCOUNT: 335 *(int *)data = vioapic_pincount(sc->vm); 336 break; 337 case VM_ISA_ASSERT_IRQ: 338 isa_irq = (struct vm_isa_irq *)data; 339 error = vatpic_assert_irq(sc->vm, isa_irq->atpic_irq); 340 if (error == 0 && isa_irq->ioapic_irq != -1) 341 error = vioapic_assert_irq(sc->vm, 342 isa_irq->ioapic_irq); 343 break; 344 case VM_ISA_DEASSERT_IRQ: 345 isa_irq = (struct vm_isa_irq *)data; 346 error = vatpic_deassert_irq(sc->vm, isa_irq->atpic_irq); 347 if (error == 0 && isa_irq->ioapic_irq != -1) 348 error = vioapic_deassert_irq(sc->vm, 349 isa_irq->ioapic_irq); 350 break; 351 case VM_ISA_PULSE_IRQ: 352 isa_irq = (struct vm_isa_irq *)data; 353 error = vatpic_pulse_irq(sc->vm, isa_irq->atpic_irq); 354 if (error == 0 && isa_irq->ioapic_irq != -1) 355 error = vioapic_pulse_irq(sc->vm, isa_irq->ioapic_irq); 356 break; 357 case VM_ISA_SET_IRQ_TRIGGER: 358 isa_irq_trigger = (struct vm_isa_irq_trigger *)data; 359 error = vatpic_set_irq_trigger(sc->vm, 360 isa_irq_trigger->atpic_irq, isa_irq_trigger->trigger); 361 break; 362 case VM_MAP_MEMORY: 363 seg = (struct vm_memory_segment *)data; 364 error = vm_malloc(sc->vm, seg->gpa, seg->len); 365 break; 366 case VM_GET_MEMORY_SEG: 367 seg = (struct vm_memory_segment *)data; 368 seg->len = 0; 369 (void)vm_gpabase2memseg(sc->vm, seg->gpa, seg); 370 error = 0; 371 break; 372 case VM_GET_REGISTER: 373 vmreg = (struct vm_register *)data; 374 error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum, 375 &vmreg->regval); 376 break; 377 case VM_SET_REGISTER: 378 vmreg = (struct vm_register *)data; 379 error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum, 380 vmreg->regval); 381 break; 382 case VM_SET_SEGMENT_DESCRIPTOR: 383 vmsegdesc = (struct vm_seg_desc *)data; 384 error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid, 385 vmsegdesc->regnum, 386 &vmsegdesc->desc); 387 break; 388 case VM_GET_SEGMENT_DESCRIPTOR: 389 vmsegdesc = (struct vm_seg_desc *)data; 390 error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid, 391 vmsegdesc->regnum, 392 &vmsegdesc->desc); 393 break; 394 case VM_GET_CAPABILITY: 395 vmcap = (struct vm_capability *)data; 396 error = vm_get_capability(sc->vm, vmcap->cpuid, 397 vmcap->captype, 398 &vmcap->capval); 399 break; 400 case VM_SET_CAPABILITY: 401 vmcap = (struct vm_capability *)data; 402 error = vm_set_capability(sc->vm, vmcap->cpuid, 403 vmcap->captype, 404 vmcap->capval); 405 break; 406 case VM_SET_X2APIC_STATE: 407 x2apic = (struct vm_x2apic *)data; 408 error = vm_set_x2apic_state(sc->vm, 409 x2apic->cpuid, x2apic->state); 410 break; 411 case VM_GET_X2APIC_STATE: 412 x2apic = (struct vm_x2apic *)data; 413 error = vm_get_x2apic_state(sc->vm, 414 x2apic->cpuid, &x2apic->state); 415 break; 416 case VM_GET_GPA_PMAP: 417 gpapte = (struct vm_gpa_pte *)data; 418 pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)), 419 gpapte->gpa, gpapte->pte, &gpapte->ptenum); 420 error = 0; 421 break; 422 case VM_GET_HPET_CAPABILITIES: 423 error = vhpet_getcap((struct vm_hpet_cap *)data); 424 break; 425 case VM_GLA2GPA: { 426 CTASSERT(PROT_READ == VM_PROT_READ); 427 CTASSERT(PROT_WRITE == VM_PROT_WRITE); 428 CTASSERT(PROT_EXEC == VM_PROT_EXECUTE); 429 gg = (struct vm_gla2gpa *)data; 430 error = vmm_gla2gpa(sc->vm, gg->vcpuid, &gg->paging, gg->gla, 431 gg->prot, &gg->gpa); 432 KASSERT(error == 0 || error == 1 || error == -1, 433 ("%s: vmm_gla2gpa unknown error %d", __func__, error)); 434 if (error >= 0) { 435 /* 436 * error = 0: the translation was successful 437 * error = 1: a fault was injected into the guest 438 */ 439 gg->fault = error; 440 error = 0; 441 } else { 442 error = EFAULT; 443 } 444 break; 445 } 446 case VM_ACTIVATE_CPU: 447 vac = (struct vm_activate_cpu *)data; 448 error = vm_activate_cpu(sc->vm, vac->vcpuid); 449 break; 450 case VM_GET_CPUS: 451 error = 0; 452 vm_cpuset = (struct vm_cpuset *)data; 453 size = vm_cpuset->cpusetsize; 454 if (size < sizeof(cpuset_t) || size > CPU_MAXSIZE / NBBY) { 455 error = ERANGE; 456 break; 457 } 458 cpuset = malloc(size, M_TEMP, M_WAITOK | M_ZERO); 459 if (vm_cpuset->which == VM_ACTIVE_CPUS) 460 *cpuset = vm_active_cpus(sc->vm); 461 else if (vm_cpuset->which == VM_SUSPENDED_CPUS) 462 *cpuset = vm_suspended_cpus(sc->vm); 463 else 464 error = EINVAL; 465 if (error == 0) 466 error = copyout(cpuset, vm_cpuset->cpus, size); 467 free(cpuset, M_TEMP); 468 break; 469 default: 470 error = ENOTTY; 471 break; 472 } 473 474 if (state_changed == 1) { 475 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 476 } else if (state_changed == 2) { 477 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) 478 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 479 } 480 481done: 482 /* Make sure that no handler returns a bogus value like ERESTART */ 483 KASSERT(error >= 0, ("vmmdev_ioctl: invalid error return %d", error)); 484 return (error); 485} 486 487static int 488vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, 489 vm_size_t size, struct vm_object **object, int nprot) 490{ 491 int error; 492 struct vmmdev_softc *sc; 493 494 sc = vmmdev_lookup2(cdev); 495 if (sc != NULL && (nprot & PROT_EXEC) == 0) 496 error = vm_get_memobj(sc->vm, *offset, size, offset, object); 497 else 498 error = EINVAL; 499 500 return (error); 501} 502 503static void 504vmmdev_destroy(void *arg) 505{ 506 507 struct vmmdev_softc *sc = arg; 508 509 if (sc->cdev != NULL) 510 destroy_dev(sc->cdev); 511 512 if (sc->vm != NULL) 513 vm_destroy(sc->vm); 514 515 if ((sc->flags & VSC_LINKED) != 0) { 516 mtx_lock(&vmmdev_mtx); 517 SLIST_REMOVE(&head, sc, vmmdev_softc, link); 518 mtx_unlock(&vmmdev_mtx); 519 } 520 521 free(sc, M_VMMDEV); 522} 523 524static int 525sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS) 526{ 527 int error; 528 char buf[VM_MAX_NAMELEN]; 529 struct vmmdev_softc *sc; 530 struct cdev *cdev; 531 532 strlcpy(buf, "beavis", sizeof(buf)); 533 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 534 if (error != 0 || req->newptr == NULL) 535 return (error); 536 537 mtx_lock(&vmmdev_mtx); 538 sc = vmmdev_lookup(buf); 539 if (sc == NULL || sc->cdev == NULL) { 540 mtx_unlock(&vmmdev_mtx); 541 return (EINVAL); 542 } 543 544 /* 545 * The 'cdev' will be destroyed asynchronously when 'si_threadcount' 546 * goes down to 0 so we should not do it again in the callback. 547 */ 548 cdev = sc->cdev; 549 sc->cdev = NULL; 550 mtx_unlock(&vmmdev_mtx); 551 552 /* 553 * Schedule the 'cdev' to be destroyed: 554 * 555 * - any new operations on this 'cdev' will return an error (ENXIO). 556 * 557 * - when the 'si_threadcount' dwindles down to zero the 'cdev' will 558 * be destroyed and the callback will be invoked in a taskqueue 559 * context. 560 */ 561 destroy_dev_sched_cb(cdev, vmmdev_destroy, sc); 562 563 return (0); 564} 565SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW, 566 NULL, 0, sysctl_vmm_destroy, "A", NULL); 567 568static struct cdevsw vmmdevsw = { 569 .d_name = "vmmdev", 570 .d_version = D_VERSION, 571 .d_ioctl = vmmdev_ioctl, 572 .d_mmap_single = vmmdev_mmap_single, 573 .d_read = vmmdev_rw, 574 .d_write = vmmdev_rw, 575}; 576 577static int 578sysctl_vmm_create(SYSCTL_HANDLER_ARGS) 579{ 580 int error; 581 struct vm *vm; 582 struct cdev *cdev; 583 struct vmmdev_softc *sc, *sc2; 584 char buf[VM_MAX_NAMELEN]; 585 586 strlcpy(buf, "beavis", sizeof(buf)); 587 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 588 if (error != 0 || req->newptr == NULL) 589 return (error); 590 591 mtx_lock(&vmmdev_mtx); 592 sc = vmmdev_lookup(buf); 593 mtx_unlock(&vmmdev_mtx); 594 if (sc != NULL) 595 return (EEXIST); 596 597 error = vm_create(buf, &vm); 598 if (error != 0) 599 return (error); 600 601 sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO); 602 sc->vm = vm; 603 604 /* 605 * Lookup the name again just in case somebody sneaked in when we 606 * dropped the lock. 607 */ 608 mtx_lock(&vmmdev_mtx); 609 sc2 = vmmdev_lookup(buf); 610 if (sc2 == NULL) { 611 SLIST_INSERT_HEAD(&head, sc, link); 612 sc->flags |= VSC_LINKED; 613 } 614 mtx_unlock(&vmmdev_mtx); 615 616 if (sc2 != NULL) { 617 vmmdev_destroy(sc); 618 return (EEXIST); 619 } 620 621 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL, 622 UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf); 623 if (error != 0) { 624 vmmdev_destroy(sc); 625 return (error); 626 } 627 628 mtx_lock(&vmmdev_mtx); 629 sc->cdev = cdev; 630 sc->cdev->si_drv1 = sc; 631 mtx_unlock(&vmmdev_mtx); 632 633 return (0); 634} 635SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW, 636 NULL, 0, sysctl_vmm_create, "A", NULL); 637 638void 639vmmdev_init(void) 640{ 641 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF); 642} 643 644int 645vmmdev_cleanup(void) 646{ 647 int error; 648 649 if (SLIST_EMPTY(&head)) 650 error = 0; 651 else 652 error = EBUSY; 653 654 return (error); 655} 656