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: releng/10.1/sys/amd64/vmm/vmm_dev.c 270159 2014-08-19 01:20:24Z grehan $
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/10.1/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
62 struct 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
70 static SLIST_HEAD(, vmmdev_softc) head;
71
72 static struct mtx vmmdev_mtx;
73
74 static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev");
75
76 SYSCTL_DECL(_hw_vmm);
77
78 static struct vmmdev_softc *
79 vmmdev_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
95 static struct vmmdev_softc *
96 vmmdev_lookup2(struct cdev *cdev)
97 {
98
99 return (cdev->si_drv1);
100 }
101
102 static int
103 vmmdev_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
145 static int
146 vmmdev_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
497 done:
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
503 static int
504 vmmdev_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
519 static void
520 vmmdev_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
540 static int
541 sysctl_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 }
581 SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW,
582 NULL, 0, sysctl_vmm_destroy, "A", NULL);
583
584 static 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
593 static int
594 sysctl_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 }
651 SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW,
652 NULL, 0, sysctl_vmm_create, "A", NULL);
653
654 void
655 vmmdev_init(void)
656 {
657 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF);
658 }
659
660 int
661 vmmdev_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 }
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