2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 NetApp, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/kernel.h>
37 #include <sys/queue.h>
39 #include <sys/mutex.h>
40 #include <sys/malloc.h>
42 #include <sys/sysctl.h>
43 #include <sys/libkern.h>
44 #include <sys/ioccom.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
54 #include <machine/vmparam.h>
55 #include <machine/vmm.h>
56 #include <machine/vmm_instruction_emul.h>
57 #include <machine/vmm_dev.h>
59 #include "vmm_lapic.h"
63 #include "io/vatpic.h"
64 #include "io/vioapic.h"
72 struct vmmdev_softc *sc;
73 SLIST_ENTRY(devmem_softc) link;
77 struct vm *vm; /* vm instance cookie */
79 SLIST_ENTRY(vmmdev_softc) link;
80 SLIST_HEAD(, devmem_softc) devmem;
83 #define VSC_LINKED 0x01
85 static SLIST_HEAD(, vmmdev_softc) head;
87 static unsigned pr_allow_flag;
88 static struct mtx vmmdev_mtx;
90 static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev");
94 static int vmm_priv_check(struct ucred *ucred);
95 static int devmem_create_cdev(const char *vmname, int id, char *devmem);
96 static void devmem_destroy(void *arg);
99 vmm_priv_check(struct ucred *ucred)
103 !(ucred->cr_prison->pr_allow & pr_allow_flag))
110 vcpu_lock_one(struct vmmdev_softc *sc, int vcpu)
114 if (vcpu < 0 || vcpu >= vm_get_maxcpus(sc->vm))
117 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true);
122 vcpu_unlock_one(struct vmmdev_softc *sc, int vcpu)
124 enum vcpu_state state;
126 state = vcpu_get_state(sc->vm, vcpu, NULL);
127 if (state != VCPU_FROZEN) {
128 panic("vcpu %s(%d) has invalid state %d", vm_name(sc->vm),
132 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false);
136 vcpu_lock_all(struct vmmdev_softc *sc)
141 maxcpus = vm_get_maxcpus(sc->vm);
142 for (vcpu = 0; vcpu < maxcpus; vcpu++) {
143 error = vcpu_lock_one(sc, vcpu);
150 vcpu_unlock_one(sc, vcpu);
157 vcpu_unlock_all(struct vmmdev_softc *sc)
162 maxcpus = vm_get_maxcpus(sc->vm);
163 for (vcpu = 0; vcpu < maxcpus; vcpu++)
164 vcpu_unlock_one(sc, vcpu);
167 static struct vmmdev_softc *
168 vmmdev_lookup(const char *name)
170 struct vmmdev_softc *sc;
172 #ifdef notyet /* XXX kernel is not compiled with invariants */
173 mtx_assert(&vmmdev_mtx, MA_OWNED);
176 SLIST_FOREACH(sc, &head, link) {
177 if (strcmp(name, vm_name(sc->vm)) == 0)
184 static struct vmmdev_softc *
185 vmmdev_lookup2(struct cdev *cdev)
188 return (cdev->si_drv1);
192 vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags)
194 int error, off, c, prot;
195 vm_paddr_t gpa, maxaddr;
197 struct vmmdev_softc *sc;
200 error = vmm_priv_check(curthread->td_ucred);
204 sc = vmmdev_lookup2(cdev);
209 * Get a read lock on the guest memory map by freezing any vcpu.
211 lastcpu = vm_get_maxcpus(sc->vm) - 1;
212 error = vcpu_lock_one(sc, lastcpu);
216 prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ);
217 maxaddr = vmm_sysmem_maxaddr(sc->vm);
218 while (uio->uio_resid > 0 && error == 0) {
219 gpa = uio->uio_offset;
220 off = gpa & PAGE_MASK;
221 c = min(uio->uio_resid, PAGE_SIZE - off);
224 * The VM has a hole in its physical memory map. If we want to
225 * use 'dd' to inspect memory beyond the hole we need to
226 * provide bogus data for memory that lies in the hole.
228 * Since this device does not support lseek(2), dd(1) will
229 * read(2) blocks of data to simulate the lseek(2).
231 hpa = vm_gpa_hold(sc->vm, lastcpu, gpa, c,
234 if (uio->uio_rw == UIO_READ && gpa < maxaddr)
235 error = uiomove(__DECONST(void *, zero_region),
240 error = uiomove(hpa, c, uio);
241 vm_gpa_release(cookie);
244 vcpu_unlock_one(sc, lastcpu);
248 CTASSERT(sizeof(((struct vm_memseg *)0)->name) >= VM_MAX_SUFFIXLEN + 1);
251 get_memseg(struct vmmdev_softc *sc, struct vm_memseg *mseg)
253 struct devmem_softc *dsc;
257 error = vm_get_memseg(sc->vm, mseg->segid, &mseg->len, &sysmem, NULL);
258 if (error || mseg->len == 0)
262 SLIST_FOREACH(dsc, &sc->devmem, link) {
263 if (dsc->segid == mseg->segid)
266 KASSERT(dsc != NULL, ("%s: devmem segment %d not found",
267 __func__, mseg->segid));
268 error = copystr(dsc->name, mseg->name, sizeof(mseg->name),
271 bzero(mseg->name, sizeof(mseg->name));
278 alloc_memseg(struct vmmdev_softc *sc, struct vm_memseg *mseg)
289 * The allocation is lengthened by 1 to hold a terminating NUL. It'll
290 * by stripped off when devfs processes the full string.
292 if (VM_MEMSEG_NAME(mseg)) {
294 name = malloc(sizeof(mseg->name), M_VMMDEV, M_WAITOK);
295 error = copystr(mseg->name, name, sizeof(mseg->name), NULL);
300 error = vm_alloc_memseg(sc->vm, mseg->segid, mseg->len, sysmem);
304 if (VM_MEMSEG_NAME(mseg)) {
305 error = devmem_create_cdev(vm_name(sc->vm), mseg->segid, name);
307 vm_free_memseg(sc->vm, mseg->segid);
309 name = NULL; /* freed when 'cdev' is destroyed */
312 free(name, M_VMMDEV);
317 vm_get_register_set(struct vm *vm, int vcpu, unsigned int count, int *regnum,
323 for (i = 0; i < count; i++) {
324 error = vm_get_register(vm, vcpu, regnum[i], ®val[i]);
332 vm_set_register_set(struct vm *vm, int vcpu, unsigned int count, int *regnum,
338 for (i = 0; i < count; i++) {
339 error = vm_set_register(vm, vcpu, regnum[i], regval[i]);
347 vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
350 int error, vcpu, state_changed, size;
352 struct vmmdev_softc *sc;
353 struct vm_register *vmreg;
354 struct vm_seg_desc *vmsegdesc;
355 struct vm_register_set *vmregset;
356 struct vm_run *vmrun;
357 struct vm_exception *vmexc;
358 struct vm_lapic_irq *vmirq;
359 struct vm_lapic_msi *vmmsi;
360 struct vm_ioapic_irq *ioapic_irq;
361 struct vm_isa_irq *isa_irq;
362 struct vm_isa_irq_trigger *isa_irq_trigger;
363 struct vm_capability *vmcap;
364 struct vm_pptdev *pptdev;
365 struct vm_pptdev_mmio *pptmmio;
366 struct vm_pptdev_msi *pptmsi;
367 struct vm_pptdev_msix *pptmsix;
368 struct vm_nmi *vmnmi;
369 struct vm_stats *vmstats;
370 struct vm_stat_desc *statdesc;
371 struct vm_x2apic *x2apic;
372 struct vm_gpa_pte *gpapte;
373 struct vm_suspend *vmsuspend;
374 struct vm_gla2gpa *gg;
375 struct vm_activate_cpu *vac;
376 struct vm_cpuset *vm_cpuset;
377 struct vm_intinfo *vmii;
378 struct vm_rtc_time *rtctime;
379 struct vm_rtc_data *rtcdata;
380 struct vm_memmap *mm;
381 struct vm_cpu_topology *topology;
385 error = vmm_priv_check(curthread->td_ucred);
389 sc = vmmdev_lookup2(cdev);
397 * Some VMM ioctls can operate only on vcpus that are not running.
401 case VM_GET_REGISTER:
402 case VM_SET_REGISTER:
403 case VM_GET_SEGMENT_DESCRIPTOR:
404 case VM_SET_SEGMENT_DESCRIPTOR:
405 case VM_GET_REGISTER_SET:
406 case VM_SET_REGISTER_SET:
407 case VM_INJECT_EXCEPTION:
408 case VM_GET_CAPABILITY:
409 case VM_SET_CAPABILITY:
412 case VM_SET_X2APIC_STATE:
414 case VM_GLA2GPA_NOFAULT:
415 case VM_ACTIVATE_CPU:
418 case VM_RESTART_INSTRUCTION:
420 * XXX fragile, handle with care
421 * Assumes that the first field of the ioctl data is the vcpu.
424 error = vcpu_lock_one(sc, vcpu);
430 case VM_MAP_PPTDEV_MMIO:
432 case VM_UNBIND_PPTDEV:
433 case VM_ALLOC_MEMSEG:
437 * ioctls that operate on the entire virtual machine must
438 * prevent all vcpus from running.
440 error = vcpu_lock_all(sc);
447 case VM_MMAP_GETNEXT:
449 * Lock a vcpu to make sure that the memory map cannot be
450 * modified while it is being inspected.
452 vcpu = vm_get_maxcpus(sc->vm) - 1;
453 error = vcpu_lock_one(sc, vcpu);
465 vmrun = (struct vm_run *)data;
466 error = vm_run(sc->vm, vmrun);
469 vmsuspend = (struct vm_suspend *)data;
470 error = vm_suspend(sc->vm, vmsuspend->how);
473 error = vm_reinit(sc->vm);
476 statdesc = (struct vm_stat_desc *)data;
477 error = vmm_stat_desc_copy(statdesc->index,
478 statdesc->desc, sizeof(statdesc->desc));
482 CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS);
483 vmstats = (struct vm_stats *)data;
484 getmicrotime(&vmstats->tv);
485 error = vmm_stat_copy(sc->vm, vmstats->cpuid,
486 &vmstats->num_entries, vmstats->statbuf);
490 pptmsi = (struct vm_pptdev_msi *)data;
491 error = ppt_setup_msi(sc->vm, pptmsi->vcpu,
492 pptmsi->bus, pptmsi->slot, pptmsi->func,
493 pptmsi->addr, pptmsi->msg,
497 pptmsix = (struct vm_pptdev_msix *)data;
498 error = ppt_setup_msix(sc->vm, pptmsix->vcpu,
499 pptmsix->bus, pptmsix->slot,
500 pptmsix->func, pptmsix->idx,
501 pptmsix->addr, pptmsix->msg,
502 pptmsix->vector_control);
504 case VM_MAP_PPTDEV_MMIO:
505 pptmmio = (struct vm_pptdev_mmio *)data;
506 error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot,
507 pptmmio->func, pptmmio->gpa, pptmmio->len,
511 pptdev = (struct vm_pptdev *)data;
512 error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot,
515 case VM_UNBIND_PPTDEV:
516 pptdev = (struct vm_pptdev *)data;
517 error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot,
520 case VM_INJECT_EXCEPTION:
521 vmexc = (struct vm_exception *)data;
522 error = vm_inject_exception(sc->vm, vmexc->cpuid,
523 vmexc->vector, vmexc->error_code_valid, vmexc->error_code,
524 vmexc->restart_instruction);
527 vmnmi = (struct vm_nmi *)data;
528 error = vm_inject_nmi(sc->vm, vmnmi->cpuid);
531 vmirq = (struct vm_lapic_irq *)data;
532 error = lapic_intr_edge(sc->vm, vmirq->cpuid, vmirq->vector);
534 case VM_LAPIC_LOCAL_IRQ:
535 vmirq = (struct vm_lapic_irq *)data;
536 error = lapic_set_local_intr(sc->vm, vmirq->cpuid,
540 vmmsi = (struct vm_lapic_msi *)data;
541 error = lapic_intr_msi(sc->vm, vmmsi->addr, vmmsi->msg);
543 case VM_IOAPIC_ASSERT_IRQ:
544 ioapic_irq = (struct vm_ioapic_irq *)data;
545 error = vioapic_assert_irq(sc->vm, ioapic_irq->irq);
547 case VM_IOAPIC_DEASSERT_IRQ:
548 ioapic_irq = (struct vm_ioapic_irq *)data;
549 error = vioapic_deassert_irq(sc->vm, ioapic_irq->irq);
551 case VM_IOAPIC_PULSE_IRQ:
552 ioapic_irq = (struct vm_ioapic_irq *)data;
553 error = vioapic_pulse_irq(sc->vm, ioapic_irq->irq);
555 case VM_IOAPIC_PINCOUNT:
556 *(int *)data = vioapic_pincount(sc->vm);
558 case VM_ISA_ASSERT_IRQ:
559 isa_irq = (struct vm_isa_irq *)data;
560 error = vatpic_assert_irq(sc->vm, isa_irq->atpic_irq);
561 if (error == 0 && isa_irq->ioapic_irq != -1)
562 error = vioapic_assert_irq(sc->vm,
563 isa_irq->ioapic_irq);
565 case VM_ISA_DEASSERT_IRQ:
566 isa_irq = (struct vm_isa_irq *)data;
567 error = vatpic_deassert_irq(sc->vm, isa_irq->atpic_irq);
568 if (error == 0 && isa_irq->ioapic_irq != -1)
569 error = vioapic_deassert_irq(sc->vm,
570 isa_irq->ioapic_irq);
572 case VM_ISA_PULSE_IRQ:
573 isa_irq = (struct vm_isa_irq *)data;
574 error = vatpic_pulse_irq(sc->vm, isa_irq->atpic_irq);
575 if (error == 0 && isa_irq->ioapic_irq != -1)
576 error = vioapic_pulse_irq(sc->vm, isa_irq->ioapic_irq);
578 case VM_ISA_SET_IRQ_TRIGGER:
579 isa_irq_trigger = (struct vm_isa_irq_trigger *)data;
580 error = vatpic_set_irq_trigger(sc->vm,
581 isa_irq_trigger->atpic_irq, isa_irq_trigger->trigger);
583 case VM_MMAP_GETNEXT:
584 mm = (struct vm_memmap *)data;
585 error = vm_mmap_getnext(sc->vm, &mm->gpa, &mm->segid,
586 &mm->segoff, &mm->len, &mm->prot, &mm->flags);
589 mm = (struct vm_memmap *)data;
590 error = vm_mmap_memseg(sc->vm, mm->gpa, mm->segid, mm->segoff,
591 mm->len, mm->prot, mm->flags);
593 case VM_ALLOC_MEMSEG:
594 error = alloc_memseg(sc, (struct vm_memseg *)data);
597 error = get_memseg(sc, (struct vm_memseg *)data);
599 case VM_GET_REGISTER:
600 vmreg = (struct vm_register *)data;
601 error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum,
604 case VM_SET_REGISTER:
605 vmreg = (struct vm_register *)data;
606 error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum,
609 case VM_SET_SEGMENT_DESCRIPTOR:
610 vmsegdesc = (struct vm_seg_desc *)data;
611 error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid,
615 case VM_GET_SEGMENT_DESCRIPTOR:
616 vmsegdesc = (struct vm_seg_desc *)data;
617 error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid,
621 case VM_GET_REGISTER_SET:
622 vmregset = (struct vm_register_set *)data;
623 if (vmregset->count > VM_REG_LAST) {
627 regvals = malloc(sizeof(regvals[0]) * vmregset->count, M_VMMDEV,
629 regnums = malloc(sizeof(regnums[0]) * vmregset->count, M_VMMDEV,
631 error = copyin(vmregset->regnums, regnums, sizeof(regnums[0]) *
634 error = vm_get_register_set(sc->vm, vmregset->cpuid,
635 vmregset->count, regnums, regvals);
637 error = copyout(regvals, vmregset->regvals,
638 sizeof(regvals[0]) * vmregset->count);
639 free(regvals, M_VMMDEV);
640 free(regnums, M_VMMDEV);
642 case VM_SET_REGISTER_SET:
643 vmregset = (struct vm_register_set *)data;
644 if (vmregset->count > VM_REG_LAST) {
648 regvals = malloc(sizeof(regvals[0]) * vmregset->count, M_VMMDEV,
650 regnums = malloc(sizeof(regnums[0]) * vmregset->count, M_VMMDEV,
652 error = copyin(vmregset->regnums, regnums, sizeof(regnums[0]) *
655 error = copyin(vmregset->regvals, regvals,
656 sizeof(regvals[0]) * vmregset->count);
658 error = vm_set_register_set(sc->vm, vmregset->cpuid,
659 vmregset->count, regnums, regvals);
660 free(regvals, M_VMMDEV);
661 free(regnums, M_VMMDEV);
663 case VM_GET_CAPABILITY:
664 vmcap = (struct vm_capability *)data;
665 error = vm_get_capability(sc->vm, vmcap->cpuid,
669 case VM_SET_CAPABILITY:
670 vmcap = (struct vm_capability *)data;
671 error = vm_set_capability(sc->vm, vmcap->cpuid,
675 case VM_SET_X2APIC_STATE:
676 x2apic = (struct vm_x2apic *)data;
677 error = vm_set_x2apic_state(sc->vm,
678 x2apic->cpuid, x2apic->state);
680 case VM_GET_X2APIC_STATE:
681 x2apic = (struct vm_x2apic *)data;
682 error = vm_get_x2apic_state(sc->vm,
683 x2apic->cpuid, &x2apic->state);
685 case VM_GET_GPA_PMAP:
686 gpapte = (struct vm_gpa_pte *)data;
687 pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)),
688 gpapte->gpa, gpapte->pte, &gpapte->ptenum);
691 case VM_GET_HPET_CAPABILITIES:
692 error = vhpet_getcap((struct vm_hpet_cap *)data);
695 CTASSERT(PROT_READ == VM_PROT_READ);
696 CTASSERT(PROT_WRITE == VM_PROT_WRITE);
697 CTASSERT(PROT_EXEC == VM_PROT_EXECUTE);
698 gg = (struct vm_gla2gpa *)data;
699 error = vm_gla2gpa(sc->vm, gg->vcpuid, &gg->paging, gg->gla,
700 gg->prot, &gg->gpa, &gg->fault);
701 KASSERT(error == 0 || error == EFAULT,
702 ("%s: vm_gla2gpa unknown error %d", __func__, error));
705 case VM_GLA2GPA_NOFAULT:
706 gg = (struct vm_gla2gpa *)data;
707 error = vm_gla2gpa_nofault(sc->vm, gg->vcpuid, &gg->paging,
708 gg->gla, gg->prot, &gg->gpa, &gg->fault);
709 KASSERT(error == 0 || error == EFAULT,
710 ("%s: vm_gla2gpa unknown error %d", __func__, error));
712 case VM_ACTIVATE_CPU:
713 vac = (struct vm_activate_cpu *)data;
714 error = vm_activate_cpu(sc->vm, vac->vcpuid);
718 vm_cpuset = (struct vm_cpuset *)data;
719 size = vm_cpuset->cpusetsize;
720 if (size < sizeof(cpuset_t) || size > CPU_MAXSIZE / NBBY) {
724 cpuset = malloc(size, M_TEMP, M_WAITOK | M_ZERO);
725 if (vm_cpuset->which == VM_ACTIVE_CPUS)
726 *cpuset = vm_active_cpus(sc->vm);
727 else if (vm_cpuset->which == VM_SUSPENDED_CPUS)
728 *cpuset = vm_suspended_cpus(sc->vm);
729 else if (vm_cpuset->which == VM_DEBUG_CPUS)
730 *cpuset = vm_debug_cpus(sc->vm);
734 error = copyout(cpuset, vm_cpuset->cpus, size);
735 free(cpuset, M_TEMP);
738 vac = (struct vm_activate_cpu *)data;
739 error = vm_suspend_cpu(sc->vm, vac->vcpuid);
742 vac = (struct vm_activate_cpu *)data;
743 error = vm_resume_cpu(sc->vm, vac->vcpuid);
746 vmii = (struct vm_intinfo *)data;
747 error = vm_exit_intinfo(sc->vm, vmii->vcpuid, vmii->info1);
750 vmii = (struct vm_intinfo *)data;
751 error = vm_get_intinfo(sc->vm, vmii->vcpuid, &vmii->info1,
755 rtcdata = (struct vm_rtc_data *)data;
756 error = vrtc_nvram_write(sc->vm, rtcdata->offset,
760 rtcdata = (struct vm_rtc_data *)data;
761 error = vrtc_nvram_read(sc->vm, rtcdata->offset,
765 rtctime = (struct vm_rtc_time *)data;
766 error = vrtc_set_time(sc->vm, rtctime->secs);
770 rtctime = (struct vm_rtc_time *)data;
771 rtctime->secs = vrtc_get_time(sc->vm);
773 case VM_RESTART_INSTRUCTION:
774 error = vm_restart_instruction(sc->vm, vcpu);
776 case VM_SET_TOPOLOGY:
777 topology = (struct vm_cpu_topology *)data;
778 error = vm_set_topology(sc->vm, topology->sockets,
779 topology->cores, topology->threads, topology->maxcpus);
781 case VM_GET_TOPOLOGY:
782 topology = (struct vm_cpu_topology *)data;
783 vm_get_topology(sc->vm, &topology->sockets, &topology->cores,
784 &topology->threads, &topology->maxcpus);
792 if (state_changed == 1)
793 vcpu_unlock_one(sc, vcpu);
794 else if (state_changed == 2)
798 /* Make sure that no handler returns a bogus value like ERESTART */
799 KASSERT(error >= 0, ("vmmdev_ioctl: invalid error return %d", error));
804 vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t mapsize,
805 struct vm_object **objp, int nprot)
807 struct vmmdev_softc *sc;
810 vm_ooffset_t segoff, first, last;
811 int error, found, segid;
815 error = vmm_priv_check(curthread->td_ucred);
820 last = first + mapsize;
821 if ((nprot & PROT_EXEC) || first < 0 || first >= last)
824 sc = vmmdev_lookup2(cdev);
826 /* virtual machine is in the process of being created */
831 * Get a read lock on the guest memory map by freezing any vcpu.
833 lastcpu = vm_get_maxcpus(sc->vm) - 1;
834 error = vcpu_lock_one(sc, lastcpu);
841 error = vm_mmap_getnext(sc->vm, &gpa, &segid, &segoff, &len,
846 if (first >= gpa && last <= gpa + len)
853 error = vm_get_memseg(sc->vm, segid, &len, &sysmem, objp);
854 KASSERT(error == 0 && *objp != NULL,
855 ("%s: invalid memory segment %d", __func__, segid));
857 vm_object_reference(*objp);
858 *offset = segoff + (first - gpa);
863 vcpu_unlock_one(sc, lastcpu);
868 vmmdev_destroy(void *arg)
870 struct vmmdev_softc *sc = arg;
871 struct devmem_softc *dsc;
874 error = vcpu_lock_all(sc);
875 KASSERT(error == 0, ("%s: error %d freezing vcpus", __func__, error));
877 while ((dsc = SLIST_FIRST(&sc->devmem)) != NULL) {
878 KASSERT(dsc->cdev == NULL, ("%s: devmem not free", __func__));
879 SLIST_REMOVE_HEAD(&sc->devmem, link);
880 free(dsc->name, M_VMMDEV);
884 if (sc->cdev != NULL)
885 destroy_dev(sc->cdev);
890 if ((sc->flags & VSC_LINKED) != 0) {
891 mtx_lock(&vmmdev_mtx);
892 SLIST_REMOVE(&head, sc, vmmdev_softc, link);
893 mtx_unlock(&vmmdev_mtx);
900 sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS)
902 struct devmem_softc *dsc;
903 struct vmmdev_softc *sc;
908 error = vmm_priv_check(req->td->td_ucred);
912 buflen = VM_MAX_NAMELEN + 1;
913 buf = malloc(buflen, M_VMMDEV, M_WAITOK | M_ZERO);
914 strlcpy(buf, "beavis", buflen);
915 error = sysctl_handle_string(oidp, buf, buflen, req);
916 if (error != 0 || req->newptr == NULL)
919 mtx_lock(&vmmdev_mtx);
920 sc = vmmdev_lookup(buf);
921 if (sc == NULL || sc->cdev == NULL) {
922 mtx_unlock(&vmmdev_mtx);
928 * The 'cdev' will be destroyed asynchronously when 'si_threadcount'
929 * goes down to 0 so we should not do it again in the callback.
931 * Setting 'sc->cdev' to NULL is also used to indicate that the VM
932 * is scheduled for destruction.
936 mtx_unlock(&vmmdev_mtx);
939 * Schedule all cdevs to be destroyed:
941 * - any new operations on the 'cdev' will return an error (ENXIO).
943 * - when the 'si_threadcount' dwindles down to zero the 'cdev' will
944 * be destroyed and the callback will be invoked in a taskqueue
947 * - the 'devmem' cdevs are destroyed before the virtual machine 'cdev'
949 SLIST_FOREACH(dsc, &sc->devmem, link) {
950 KASSERT(dsc->cdev != NULL, ("devmem cdev already destroyed"));
951 destroy_dev_sched_cb(dsc->cdev, devmem_destroy, dsc);
953 destroy_dev_sched_cb(cdev, vmmdev_destroy, sc);
960 SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy,
961 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
962 NULL, 0, sysctl_vmm_destroy, "A", NULL);
964 static struct cdevsw vmmdevsw = {
966 .d_version = D_VERSION,
967 .d_ioctl = vmmdev_ioctl,
968 .d_mmap_single = vmmdev_mmap_single,
970 .d_write = vmmdev_rw,
974 sysctl_vmm_create(SYSCTL_HANDLER_ARGS)
978 struct vmmdev_softc *sc, *sc2;
982 error = vmm_priv_check(req->td->td_ucred);
986 buflen = VM_MAX_NAMELEN + 1;
987 buf = malloc(buflen, M_VMMDEV, M_WAITOK | M_ZERO);
988 strlcpy(buf, "beavis", buflen);
989 error = sysctl_handle_string(oidp, buf, buflen, req);
990 if (error != 0 || req->newptr == NULL)
993 mtx_lock(&vmmdev_mtx);
994 sc = vmmdev_lookup(buf);
995 mtx_unlock(&vmmdev_mtx);
1001 error = vm_create(buf, &vm);
1005 sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO);
1007 SLIST_INIT(&sc->devmem);
1010 * Lookup the name again just in case somebody sneaked in when we
1013 mtx_lock(&vmmdev_mtx);
1014 sc2 = vmmdev_lookup(buf);
1016 SLIST_INSERT_HEAD(&head, sc, link);
1017 sc->flags |= VSC_LINKED;
1019 mtx_unlock(&vmmdev_mtx);
1027 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL,
1028 UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf);
1034 mtx_lock(&vmmdev_mtx);
1036 sc->cdev->si_drv1 = sc;
1037 mtx_unlock(&vmmdev_mtx);
1040 free(buf, M_VMMDEV);
1043 SYSCTL_PROC(_hw_vmm, OID_AUTO, create,
1044 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
1045 NULL, 0, sysctl_vmm_create, "A", NULL);
1050 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF);
1051 pr_allow_flag = prison_add_allow(NULL, "vmm", NULL,
1052 "Allow use of vmm in a jail.");
1056 vmmdev_cleanup(void)
1060 if (SLIST_EMPTY(&head))
1069 devmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t len,
1070 struct vm_object **objp, int nprot)
1072 struct devmem_softc *dsc;
1073 vm_ooffset_t first, last;
1079 dsc = cdev->si_drv1;
1081 /* 'cdev' has been created but is not ready for use */
1086 last = *offset + len;
1087 if ((nprot & PROT_EXEC) || first < 0 || first >= last)
1090 lastcpu = vm_get_maxcpus(dsc->sc->vm) - 1;
1091 error = vcpu_lock_one(dsc->sc, lastcpu);
1095 error = vm_get_memseg(dsc->sc->vm, dsc->segid, &seglen, &sysmem, objp);
1096 KASSERT(error == 0 && !sysmem && *objp != NULL,
1097 ("%s: invalid devmem segment %d", __func__, dsc->segid));
1099 vcpu_unlock_one(dsc->sc, lastcpu);
1101 if (seglen >= last) {
1102 vm_object_reference(*objp);
1109 static struct cdevsw devmemsw = {
1111 .d_version = D_VERSION,
1112 .d_mmap_single = devmem_mmap_single,
1116 devmem_create_cdev(const char *vmname, int segid, char *devname)
1118 struct devmem_softc *dsc;
1119 struct vmmdev_softc *sc;
1123 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &devmemsw, NULL,
1124 UID_ROOT, GID_WHEEL, 0600, "vmm.io/%s.%s", vmname, devname);
1128 dsc = malloc(sizeof(struct devmem_softc), M_VMMDEV, M_WAITOK | M_ZERO);
1130 mtx_lock(&vmmdev_mtx);
1131 sc = vmmdev_lookup(vmname);
1132 KASSERT(sc != NULL, ("%s: vm %s softc not found", __func__, vmname));
1133 if (sc->cdev == NULL) {
1134 /* virtual machine is being created or destroyed */
1135 mtx_unlock(&vmmdev_mtx);
1136 free(dsc, M_VMMDEV);
1137 destroy_dev_sched_cb(cdev, NULL, 0);
1142 dsc->name = devname;
1145 SLIST_INSERT_HEAD(&sc->devmem, dsc, link);
1146 mtx_unlock(&vmmdev_mtx);
1148 /* The 'cdev' is ready for use after 'si_drv1' is initialized */
1149 cdev->si_drv1 = dsc;
1154 devmem_destroy(void *arg)
1156 struct devmem_softc *dsc = arg;
1158 KASSERT(dsc->cdev, ("%s: devmem cdev already destroyed", __func__));