vmm_dev.c revision 270071
1158115Sume/*- 2158115Sume * Copyright (c) 2011 NetApp, Inc. 3158115Sume * All rights reserved. 4158115Sume * 5158115Sume * Redistribution and use in source and binary forms, with or without 6158115Sume * modification, are permitted provided that the following conditions 7158115Sume * are met: 8158115Sume * 1. Redistributions of source code must retain the above copyright 9158115Sume * notice, this list of conditions and the following disclaimer. 10158115Sume * 2. Redistributions in binary form must reproduce the above copyright 11158115Sume * notice, this list of conditions and the following disclaimer in the 12158115Sume * documentation and/or other materials provided with the distribution. 13158115Sume * 14158115Sume * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15158115Sume * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16158115Sume * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17158115Sume * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18158115Sume * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19158115Sume * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20158115Sume * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21158115Sume * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22158115Sume * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23158115Sume * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24158115Sume * SUCH DAMAGE. 25158115Sume * 26158115Sume * $FreeBSD: stable/10/sys/amd64/vmm/vmm_dev.c 270071 2014-08-17 01:00:42Z grehan $ 27158115Sume */ 28158115Sume 29158115Sume#include <sys/cdefs.h> 30158115Sume__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_dev.c 270071 2014-08-17 01:00:42Z grehan $"); 31158115Sume 32194093Sdes#include <sys/param.h> 33158115Sume#include <sys/kernel.h> 34194093Sdes#include <sys/queue.h> 35158115Sume#include <sys/lock.h> 36158115Sume#include <sys/mutex.h> 37158115Sume#include <sys/malloc.h> 38158115Sume#include <sys/conf.h> 39158115Sume#include <sys/sysctl.h> 40158115Sume#include <sys/libkern.h> 41158115Sume#include <sys/ioccom.h> 42158115Sume#include <sys/mman.h> 43158115Sume#include <sys/uio.h> 44158115Sume 45158115Sume#include <vm/vm.h> 46158115Sume#include <vm/pmap.h> 47158115Sume#include <vm/vm_map.h> 48158115Sume 49158115Sume#include <machine/vmparam.h> 50158115Sume#include <machine/vmm.h> 51158115Sume#include <machine/vmm_instruction_emul.h> 52158115Sume#include <machine/vmm_dev.h> 53158115Sume 54158115Sume#include "vmm_lapic.h" 55158115Sume#include "vmm_stat.h" 56158115Sume#include "vmm_mem.h" 57158115Sume#include "io/ppt.h" 58158115Sume#include "io/vatpic.h" 59194087Sdes#include "io/vioapic.h" 60158115Sume#include "io/vhpet.h" 61158115Sume 62158115Sumestruct vmmdev_softc { 63158115Sume struct vm *vm; /* vm instance cookie */ 64194104Sdes struct cdev *cdev; 65158115Sume SLIST_ENTRY(vmmdev_softc) link; 66158115Sume int flags; 67158115Sume}; 68158115Sume#define VSC_LINKED 0x01 69158115Sume 70158115Sumestatic SLIST_HEAD(, vmmdev_softc) head; 71158115Sume 72158115Sumestatic struct mtx vmmdev_mtx; 73158115Sume 74158115Sumestatic MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev"); 75158115Sume 76158115SumeSYSCTL_DECL(_hw_vmm); 77158115Sume 78158115Sumestatic struct vmmdev_softc * 79158115Sumevmmdev_lookup(const char *name) 80158115Sume{ 81194104Sdes struct vmmdev_softc *sc; 82158115Sume 83158115Sume#ifdef notyet /* XXX kernel is not compiled with invariants */ 84158115Sume mtx_assert(&vmmdev_mtx, MA_OWNED); 85158115Sume#endif 86158115Sume 87158115Sume SLIST_FOREACH(sc, &head, link) { 88158115Sume if (strcmp(name, vm_name(sc->vm)) == 0) 89158115Sume break; 90158115Sume } 91158115Sume 92158115Sume return (sc); 93158115Sume} 94158115Sume 95158115Sumestatic struct vmmdev_softc * 96158115Sumevmmdev_lookup2(struct cdev *cdev) 97158115Sume{ 98158115Sume 99158115Sume return (cdev->si_drv1); 100158115Sume} 101158115Sume 102158115Sumestatic int 103158115Sumevmmdev_rw(struct cdev *cdev, struct uio *uio, int flags) 104158115Sume{ 105158115Sume int error, off, c, prot; 106158115Sume vm_paddr_t gpa; 107158115Sume void *hpa, *cookie; 108158115Sume struct vmmdev_softc *sc; 109158115Sume 110158115Sume static char zerobuf[PAGE_SIZE]; 111158115Sume 112158115Sume error = 0; 113158115Sume sc = vmmdev_lookup2(cdev); 114158115Sume if (sc == NULL) 115158115Sume error = ENXIO; 116158115Sume 117158115Sume prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ); 118158115Sume while (uio->uio_resid > 0 && error == 0) { 119158115Sume gpa = uio->uio_offset; 120158115Sume off = gpa & PAGE_MASK; 121158115Sume c = min(uio->uio_resid, PAGE_SIZE - off); 122158115Sume 123158115Sume /* 124158115Sume * The VM has a hole in its physical memory map. If we want to 125158115Sume * use 'dd' to inspect memory beyond the hole we need to 126158115Sume * provide bogus data for memory that lies in the hole. 127158115Sume * 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 case VM_REINIT: 224 /* 225 * ioctls that operate on the entire virtual machine must 226 * prevent all vcpus from running. 227 */ 228 error = 0; 229 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) { 230 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true); 231 if (error) 232 break; 233 } 234 235 if (error) { 236 while (--vcpu >= 0) 237 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 238 goto done; 239 } 240 241 state_changed = 2; 242 break; 243 244 default: 245 break; 246 } 247 248 switch(cmd) { 249 case VM_RUN: 250 vmrun = (struct vm_run *)data; 251 error = vm_run(sc->vm, vmrun); 252 break; 253 case VM_SUSPEND: 254 vmsuspend = (struct vm_suspend *)data; 255 error = vm_suspend(sc->vm, vmsuspend->how); 256 break; 257 case VM_REINIT: 258 error = vm_reinit(sc->vm); 259 break; 260 case VM_STAT_DESC: { 261 statdesc = (struct vm_stat_desc *)data; 262 error = vmm_stat_desc_copy(statdesc->index, 263 statdesc->desc, sizeof(statdesc->desc)); 264 break; 265 } 266 case VM_STATS: { 267 CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS); 268 vmstats = (struct vm_stats *)data; 269 getmicrotime(&vmstats->tv); 270 error = vmm_stat_copy(sc->vm, vmstats->cpuid, 271 &vmstats->num_entries, vmstats->statbuf); 272 break; 273 } 274 case VM_PPTDEV_MSI: 275 pptmsi = (struct vm_pptdev_msi *)data; 276 error = ppt_setup_msi(sc->vm, pptmsi->vcpu, 277 pptmsi->bus, pptmsi->slot, pptmsi->func, 278 pptmsi->addr, pptmsi->msg, 279 pptmsi->numvec); 280 break; 281 case VM_PPTDEV_MSIX: 282 pptmsix = (struct vm_pptdev_msix *)data; 283 error = ppt_setup_msix(sc->vm, pptmsix->vcpu, 284 pptmsix->bus, pptmsix->slot, 285 pptmsix->func, pptmsix->idx, 286 pptmsix->addr, pptmsix->msg, 287 pptmsix->vector_control); 288 break; 289 case VM_MAP_PPTDEV_MMIO: 290 pptmmio = (struct vm_pptdev_mmio *)data; 291 error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot, 292 pptmmio->func, pptmmio->gpa, pptmmio->len, 293 pptmmio->hpa); 294 break; 295 case VM_BIND_PPTDEV: 296 pptdev = (struct vm_pptdev *)data; 297 error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 298 pptdev->func); 299 break; 300 case VM_UNBIND_PPTDEV: 301 pptdev = (struct vm_pptdev *)data; 302 error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 303 pptdev->func); 304 break; 305 case VM_INJECT_EXCEPTION: 306 vmexc = (struct vm_exception *)data; 307 error = vm_inject_exception(sc->vm, vmexc->cpuid, vmexc); 308 break; 309 case VM_INJECT_NMI: 310 vmnmi = (struct vm_nmi *)data; 311 error = vm_inject_nmi(sc->vm, vmnmi->cpuid); 312 break; 313 case VM_LAPIC_IRQ: 314 vmirq = (struct vm_lapic_irq *)data; 315 error = lapic_intr_edge(sc->vm, vmirq->cpuid, vmirq->vector); 316 break; 317 case VM_LAPIC_LOCAL_IRQ: 318 vmirq = (struct vm_lapic_irq *)data; 319 error = lapic_set_local_intr(sc->vm, vmirq->cpuid, 320 vmirq->vector); 321 break; 322 case VM_LAPIC_MSI: 323 vmmsi = (struct vm_lapic_msi *)data; 324 error = lapic_intr_msi(sc->vm, vmmsi->addr, vmmsi->msg); 325 break; 326 case VM_IOAPIC_ASSERT_IRQ: 327 ioapic_irq = (struct vm_ioapic_irq *)data; 328 error = vioapic_assert_irq(sc->vm, ioapic_irq->irq); 329 break; 330 case VM_IOAPIC_DEASSERT_IRQ: 331 ioapic_irq = (struct vm_ioapic_irq *)data; 332 error = vioapic_deassert_irq(sc->vm, ioapic_irq->irq); 333 break; 334 case VM_IOAPIC_PULSE_IRQ: 335 ioapic_irq = (struct vm_ioapic_irq *)data; 336 error = vioapic_pulse_irq(sc->vm, ioapic_irq->irq); 337 break; 338 case VM_IOAPIC_PINCOUNT: 339 *(int *)data = vioapic_pincount(sc->vm); 340 break; 341 case VM_ISA_ASSERT_IRQ: 342 isa_irq = (struct vm_isa_irq *)data; 343 error = vatpic_assert_irq(sc->vm, isa_irq->atpic_irq); 344 if (error == 0 && isa_irq->ioapic_irq != -1) 345 error = vioapic_assert_irq(sc->vm, 346 isa_irq->ioapic_irq); 347 break; 348 case VM_ISA_DEASSERT_IRQ: 349 isa_irq = (struct vm_isa_irq *)data; 350 error = vatpic_deassert_irq(sc->vm, isa_irq->atpic_irq); 351 if (error == 0 && isa_irq->ioapic_irq != -1) 352 error = vioapic_deassert_irq(sc->vm, 353 isa_irq->ioapic_irq); 354 break; 355 case VM_ISA_PULSE_IRQ: 356 isa_irq = (struct vm_isa_irq *)data; 357 error = vatpic_pulse_irq(sc->vm, isa_irq->atpic_irq); 358 if (error == 0 && isa_irq->ioapic_irq != -1) 359 error = vioapic_pulse_irq(sc->vm, isa_irq->ioapic_irq); 360 break; 361 case VM_ISA_SET_IRQ_TRIGGER: 362 isa_irq_trigger = (struct vm_isa_irq_trigger *)data; 363 error = vatpic_set_irq_trigger(sc->vm, 364 isa_irq_trigger->atpic_irq, isa_irq_trigger->trigger); 365 break; 366 case VM_MAP_MEMORY: 367 seg = (struct vm_memory_segment *)data; 368 error = vm_malloc(sc->vm, seg->gpa, seg->len); 369 break; 370 case VM_GET_MEMORY_SEG: 371 seg = (struct vm_memory_segment *)data; 372 seg->len = 0; 373 (void)vm_gpabase2memseg(sc->vm, seg->gpa, seg); 374 error = 0; 375 break; 376 case VM_GET_REGISTER: 377 vmreg = (struct vm_register *)data; 378 error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum, 379 &vmreg->regval); 380 break; 381 case VM_SET_REGISTER: 382 vmreg = (struct vm_register *)data; 383 error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum, 384 vmreg->regval); 385 break; 386 case VM_SET_SEGMENT_DESCRIPTOR: 387 vmsegdesc = (struct vm_seg_desc *)data; 388 error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid, 389 vmsegdesc->regnum, 390 &vmsegdesc->desc); 391 break; 392 case VM_GET_SEGMENT_DESCRIPTOR: 393 vmsegdesc = (struct vm_seg_desc *)data; 394 error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid, 395 vmsegdesc->regnum, 396 &vmsegdesc->desc); 397 break; 398 case VM_GET_CAPABILITY: 399 vmcap = (struct vm_capability *)data; 400 error = vm_get_capability(sc->vm, vmcap->cpuid, 401 vmcap->captype, 402 &vmcap->capval); 403 break; 404 case VM_SET_CAPABILITY: 405 vmcap = (struct vm_capability *)data; 406 error = vm_set_capability(sc->vm, vmcap->cpuid, 407 vmcap->captype, 408 vmcap->capval); 409 break; 410 case VM_SET_X2APIC_STATE: 411 x2apic = (struct vm_x2apic *)data; 412 error = vm_set_x2apic_state(sc->vm, 413 x2apic->cpuid, x2apic->state); 414 break; 415 case VM_GET_X2APIC_STATE: 416 x2apic = (struct vm_x2apic *)data; 417 error = vm_get_x2apic_state(sc->vm, 418 x2apic->cpuid, &x2apic->state); 419 break; 420 case VM_GET_GPA_PMAP: 421 gpapte = (struct vm_gpa_pte *)data; 422 pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)), 423 gpapte->gpa, gpapte->pte, &gpapte->ptenum); 424 error = 0; 425 break; 426 case VM_GET_HPET_CAPABILITIES: 427 error = vhpet_getcap((struct vm_hpet_cap *)data); 428 break; 429 case VM_GLA2GPA: { 430 CTASSERT(PROT_READ == VM_PROT_READ); 431 CTASSERT(PROT_WRITE == VM_PROT_WRITE); 432 CTASSERT(PROT_EXEC == VM_PROT_EXECUTE); 433 gg = (struct vm_gla2gpa *)data; 434 error = vmm_gla2gpa(sc->vm, gg->vcpuid, &gg->paging, gg->gla, 435 gg->prot, &gg->gpa); 436 KASSERT(error == 0 || error == 1 || error == -1, 437 ("%s: vmm_gla2gpa unknown error %d", __func__, error)); 438 if (error >= 0) { 439 /* 440 * error = 0: the translation was successful 441 * error = 1: a fault was injected into the guest 442 */ 443 gg->fault = error; 444 error = 0; 445 } else { 446 error = EFAULT; 447 } 448 break; 449 } 450 case VM_ACTIVATE_CPU: 451 vac = (struct vm_activate_cpu *)data; 452 error = vm_activate_cpu(sc->vm, vac->vcpuid); 453 break; 454 case VM_GET_CPUS: 455 error = 0; 456 vm_cpuset = (struct vm_cpuset *)data; 457 size = vm_cpuset->cpusetsize; 458 if (size < sizeof(cpuset_t) || size > CPU_MAXSIZE / NBBY) { 459 error = ERANGE; 460 break; 461 } 462 cpuset = malloc(size, M_TEMP, M_WAITOK | M_ZERO); 463 if (vm_cpuset->which == VM_ACTIVE_CPUS) 464 *cpuset = vm_active_cpus(sc->vm); 465 else if (vm_cpuset->which == VM_SUSPENDED_CPUS) 466 *cpuset = vm_suspended_cpus(sc->vm); 467 else 468 error = EINVAL; 469 if (error == 0) 470 error = copyout(cpuset, vm_cpuset->cpus, size); 471 free(cpuset, M_TEMP); 472 break; 473 default: 474 error = ENOTTY; 475 break; 476 } 477 478 if (state_changed == 1) { 479 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 480 } else if (state_changed == 2) { 481 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) 482 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false); 483 } 484 485done: 486 /* Make sure that no handler returns a bogus value like ERESTART */ 487 KASSERT(error >= 0, ("vmmdev_ioctl: invalid error return %d", error)); 488 return (error); 489} 490 491static int 492vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, 493 vm_size_t size, struct vm_object **object, int nprot) 494{ 495 int error; 496 struct vmmdev_softc *sc; 497 498 sc = vmmdev_lookup2(cdev); 499 if (sc != NULL && (nprot & PROT_EXEC) == 0) 500 error = vm_get_memobj(sc->vm, *offset, size, offset, object); 501 else 502 error = EINVAL; 503 504 return (error); 505} 506 507static void 508vmmdev_destroy(void *arg) 509{ 510 511 struct vmmdev_softc *sc = arg; 512 513 if (sc->cdev != NULL) 514 destroy_dev(sc->cdev); 515 516 if (sc->vm != NULL) 517 vm_destroy(sc->vm); 518 519 if ((sc->flags & VSC_LINKED) != 0) { 520 mtx_lock(&vmmdev_mtx); 521 SLIST_REMOVE(&head, sc, vmmdev_softc, link); 522 mtx_unlock(&vmmdev_mtx); 523 } 524 525 free(sc, M_VMMDEV); 526} 527 528static int 529sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS) 530{ 531 int error; 532 char buf[VM_MAX_NAMELEN]; 533 struct vmmdev_softc *sc; 534 struct cdev *cdev; 535 536 strlcpy(buf, "beavis", sizeof(buf)); 537 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 538 if (error != 0 || req->newptr == NULL) 539 return (error); 540 541 mtx_lock(&vmmdev_mtx); 542 sc = vmmdev_lookup(buf); 543 if (sc == NULL || sc->cdev == NULL) { 544 mtx_unlock(&vmmdev_mtx); 545 return (EINVAL); 546 } 547 548 /* 549 * The 'cdev' will be destroyed asynchronously when 'si_threadcount' 550 * goes down to 0 so we should not do it again in the callback. 551 */ 552 cdev = sc->cdev; 553 sc->cdev = NULL; 554 mtx_unlock(&vmmdev_mtx); 555 556 /* 557 * Schedule the 'cdev' to be destroyed: 558 * 559 * - any new operations on this 'cdev' will return an error (ENXIO). 560 * 561 * - when the 'si_threadcount' dwindles down to zero the 'cdev' will 562 * be destroyed and the callback will be invoked in a taskqueue 563 * context. 564 */ 565 destroy_dev_sched_cb(cdev, vmmdev_destroy, sc); 566 567 return (0); 568} 569SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW, 570 NULL, 0, sysctl_vmm_destroy, "A", NULL); 571 572static struct cdevsw vmmdevsw = { 573 .d_name = "vmmdev", 574 .d_version = D_VERSION, 575 .d_ioctl = vmmdev_ioctl, 576 .d_mmap_single = vmmdev_mmap_single, 577 .d_read = vmmdev_rw, 578 .d_write = vmmdev_rw, 579}; 580 581static int 582sysctl_vmm_create(SYSCTL_HANDLER_ARGS) 583{ 584 int error; 585 struct vm *vm; 586 struct cdev *cdev; 587 struct vmmdev_softc *sc, *sc2; 588 char buf[VM_MAX_NAMELEN]; 589 590 strlcpy(buf, "beavis", sizeof(buf)); 591 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 592 if (error != 0 || req->newptr == NULL) 593 return (error); 594 595 mtx_lock(&vmmdev_mtx); 596 sc = vmmdev_lookup(buf); 597 mtx_unlock(&vmmdev_mtx); 598 if (sc != NULL) 599 return (EEXIST); 600 601 error = vm_create(buf, &vm); 602 if (error != 0) 603 return (error); 604 605 sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO); 606 sc->vm = vm; 607 608 /* 609 * Lookup the name again just in case somebody sneaked in when we 610 * dropped the lock. 611 */ 612 mtx_lock(&vmmdev_mtx); 613 sc2 = vmmdev_lookup(buf); 614 if (sc2 == NULL) { 615 SLIST_INSERT_HEAD(&head, sc, link); 616 sc->flags |= VSC_LINKED; 617 } 618 mtx_unlock(&vmmdev_mtx); 619 620 if (sc2 != NULL) { 621 vmmdev_destroy(sc); 622 return (EEXIST); 623 } 624 625 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL, 626 UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf); 627 if (error != 0) { 628 vmmdev_destroy(sc); 629 return (error); 630 } 631 632 mtx_lock(&vmmdev_mtx); 633 sc->cdev = cdev; 634 sc->cdev->si_drv1 = sc; 635 mtx_unlock(&vmmdev_mtx); 636 637 return (0); 638} 639SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW, 640 NULL, 0, sysctl_vmm_create, "A", NULL); 641 642void 643vmmdev_init(void) 644{ 645 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF); 646} 647 648int 649vmmdev_cleanup(void) 650{ 651 int error; 652 653 if (SLIST_EMPTY(&head)) 654 error = 0; 655 else 656 error = EBUSY; 657 658 return (error); 659} 660