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|
/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
#include <sys/libkern.h>
#include <sys/ioccom.h>
#include <sys/mman.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#include <machine/vmparam.h>
#include <machine/vmm.h>
#include "vmm_lapic.h"
#include "vmm_stat.h"
#include "vmm_mem.h"
#include "io/ppt.h"
#include <machine/vmm_dev.h>
struct vmmdev_softc {
struct vm *vm; /* vm instance cookie */
struct cdev *cdev;
SLIST_ENTRY(vmmdev_softc) link;
};
static SLIST_HEAD(, vmmdev_softc) head;
static struct mtx vmmdev_mtx;
static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev");
SYSCTL_DECL(_hw_vmm);
static struct vmmdev_softc *
vmmdev_lookup(const char *name)
{
struct vmmdev_softc *sc;
#ifdef notyet /* XXX kernel is not compiled with invariants */
mtx_assert(&vmmdev_mtx, MA_OWNED);
#endif
SLIST_FOREACH(sc, &head, link) {
if (strcmp(name, vm_name(sc->vm)) == 0)
break;
}
return (sc);
}
static struct vmmdev_softc *
vmmdev_lookup2(struct cdev *cdev)
{
return (cdev->si_drv1);
}
static int
vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags)
{
int error, off, c;
vm_paddr_t hpa, gpa;
struct vmmdev_softc *sc;
static char zerobuf[PAGE_SIZE];
error = 0;
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup2(cdev);
if (sc == NULL)
error = ENXIO;
while (uio->uio_resid > 0 && error == 0) {
gpa = uio->uio_offset;
off = gpa & PAGE_MASK;
c = min(uio->uio_resid, PAGE_SIZE - off);
/*
* The VM has a hole in its physical memory map. If we want to
* use 'dd' to inspect memory beyond the hole we need to
* provide bogus data for memory that lies in the hole.
*
* Since this device does not support lseek(2), dd(1) will
* read(2) blocks of data to simulate the lseek(2).
*/
hpa = vm_gpa2hpa(sc->vm, gpa, c);
if (hpa == (vm_paddr_t)-1) {
if (uio->uio_rw == UIO_READ)
error = uiomove(zerobuf, c, uio);
else
error = EFAULT;
} else
error = uiomove((void *)PHYS_TO_DMAP(hpa), c, uio);
}
mtx_unlock(&vmmdev_mtx);
return (error);
}
static int
vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
int error, vcpu, state_changed;
enum vcpu_state new_state;
struct vmmdev_softc *sc;
struct vm_memory_segment *seg;
struct vm_register *vmreg;
struct vm_seg_desc* vmsegdesc;
struct vm_run *vmrun;
struct vm_event *vmevent;
struct vm_lapic_irq *vmirq;
struct vm_capability *vmcap;
struct vm_pptdev *pptdev;
struct vm_pptdev_mmio *pptmmio;
struct vm_pptdev_msi *pptmsi;
struct vm_pptdev_msix *pptmsix;
struct vm_nmi *vmnmi;
struct vm_stats *vmstats;
struct vm_stat_desc *statdesc;
struct vm_x2apic *x2apic;
sc = vmmdev_lookup2(cdev);
if (sc == NULL)
return (ENXIO);
vcpu = -1;
state_changed = 0;
/*
* Some VMM ioctls can operate only on vcpus that are not running.
*/
switch (cmd) {
case VM_RUN:
case VM_GET_REGISTER:
case VM_SET_REGISTER:
case VM_GET_SEGMENT_DESCRIPTOR:
case VM_SET_SEGMENT_DESCRIPTOR:
case VM_INJECT_EVENT:
case VM_GET_CAPABILITY:
case VM_SET_CAPABILITY:
case VM_PPTDEV_MSI:
case VM_PPTDEV_MSIX:
case VM_SET_X2APIC_STATE:
/*
* XXX fragile, handle with care
* Assumes that the first field of the ioctl data is the vcpu.
*/
vcpu = *(int *)data;
if (vcpu < 0 || vcpu >= VM_MAXCPU) {
error = EINVAL;
goto done;
}
if (cmd == VM_RUN)
new_state = VCPU_RUNNING;
else
new_state = VCPU_CANNOT_RUN;
error = vcpu_set_state(sc->vm, vcpu, new_state);
if (error)
goto done;
state_changed = 1;
break;
case VM_MAP_PPTDEV_MMIO:
case VM_BIND_PPTDEV:
case VM_UNBIND_PPTDEV:
case VM_MAP_MEMORY:
/*
* ioctls that operate on the entire virtual machine must
* prevent all vcpus from running.
*/
error = 0;
for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) {
error = vcpu_set_state(sc->vm, vcpu, VCPU_CANNOT_RUN);
if (error)
break;
}
if (error) {
while (--vcpu >= 0)
vcpu_set_state(sc->vm, vcpu, VCPU_IDLE);
goto done;
}
state_changed = 2;
break;
default:
break;
}
switch(cmd) {
case VM_RUN:
vmrun = (struct vm_run *)data;
error = vm_run(sc->vm, vmrun);
break;
case VM_STAT_DESC: {
const char *desc;
statdesc = (struct vm_stat_desc *)data;
desc = vmm_stat_desc(statdesc->index);
if (desc != NULL) {
error = 0;
strlcpy(statdesc->desc, desc, sizeof(statdesc->desc));
} else
error = EINVAL;
break;
}
case VM_STATS: {
CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_TYPES);
vmstats = (struct vm_stats *)data;
getmicrotime(&vmstats->tv);
error = vmm_stat_copy(sc->vm, vmstats->cpuid,
&vmstats->num_entries, vmstats->statbuf);
break;
}
case VM_PPTDEV_MSI:
pptmsi = (struct vm_pptdev_msi *)data;
error = ppt_setup_msi(sc->vm, pptmsi->vcpu,
pptmsi->bus, pptmsi->slot, pptmsi->func,
pptmsi->destcpu, pptmsi->vector,
pptmsi->numvec);
break;
case VM_PPTDEV_MSIX:
pptmsix = (struct vm_pptdev_msix *)data;
error = ppt_setup_msix(sc->vm, pptmsix->vcpu,
pptmsix->bus, pptmsix->slot,
pptmsix->func, pptmsix->idx,
pptmsix->msg, pptmsix->vector_control,
pptmsix->addr);
break;
case VM_MAP_PPTDEV_MMIO:
pptmmio = (struct vm_pptdev_mmio *)data;
error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot,
pptmmio->func, pptmmio->gpa, pptmmio->len,
pptmmio->hpa);
break;
case VM_BIND_PPTDEV:
pptdev = (struct vm_pptdev *)data;
error = ppt_assign_device(sc->vm, pptdev->bus, pptdev->slot,
pptdev->func);
break;
case VM_UNBIND_PPTDEV:
pptdev = (struct vm_pptdev *)data;
error = ppt_unassign_device(sc->vm, pptdev->bus, pptdev->slot,
pptdev->func);
break;
case VM_INJECT_EVENT:
vmevent = (struct vm_event *)data;
error = vm_inject_event(sc->vm, vmevent->cpuid, vmevent->type,
vmevent->vector,
vmevent->error_code,
vmevent->error_code_valid);
break;
case VM_INJECT_NMI:
vmnmi = (struct vm_nmi *)data;
error = vm_inject_nmi(sc->vm, vmnmi->cpuid);
break;
case VM_LAPIC_IRQ:
vmirq = (struct vm_lapic_irq *)data;
error = lapic_set_intr(sc->vm, vmirq->cpuid, vmirq->vector);
break;
case VM_MAP_MEMORY:
seg = (struct vm_memory_segment *)data;
error = vm_malloc(sc->vm, seg->gpa, seg->len);
break;
case VM_GET_MEMORY_SEG:
seg = (struct vm_memory_segment *)data;
seg->len = 0;
(void)vm_gpabase2memseg(sc->vm, seg->gpa, seg);
error = 0;
break;
case VM_GET_REGISTER:
vmreg = (struct vm_register *)data;
error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum,
&vmreg->regval);
break;
case VM_SET_REGISTER:
vmreg = (struct vm_register *)data;
error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum,
vmreg->regval);
break;
case VM_SET_SEGMENT_DESCRIPTOR:
vmsegdesc = (struct vm_seg_desc *)data;
error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid,
vmsegdesc->regnum,
&vmsegdesc->desc);
break;
case VM_GET_SEGMENT_DESCRIPTOR:
vmsegdesc = (struct vm_seg_desc *)data;
error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid,
vmsegdesc->regnum,
&vmsegdesc->desc);
break;
case VM_GET_CAPABILITY:
vmcap = (struct vm_capability *)data;
error = vm_get_capability(sc->vm, vmcap->cpuid,
vmcap->captype,
&vmcap->capval);
break;
case VM_SET_CAPABILITY:
vmcap = (struct vm_capability *)data;
error = vm_set_capability(sc->vm, vmcap->cpuid,
vmcap->captype,
vmcap->capval);
break;
case VM_SET_X2APIC_STATE:
x2apic = (struct vm_x2apic *)data;
error = vm_set_x2apic_state(sc->vm,
x2apic->cpuid, x2apic->state);
break;
case VM_GET_X2APIC_STATE:
x2apic = (struct vm_x2apic *)data;
error = vm_get_x2apic_state(sc->vm,
x2apic->cpuid, &x2apic->state);
break;
default:
error = ENOTTY;
break;
}
if (state_changed == 1) {
vcpu_set_state(sc->vm, vcpu, VCPU_IDLE);
} else if (state_changed == 2) {
for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++)
vcpu_set_state(sc->vm, vcpu, VCPU_IDLE);
}
done:
return (error);
}
static int
vmmdev_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
int nprot, vm_memattr_t *memattr)
{
int error;
struct vmmdev_softc *sc;
error = -1;
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup2(cdev);
if (sc != NULL && (nprot & PROT_EXEC) == 0) {
*paddr = vm_gpa2hpa(sc->vm, (vm_paddr_t)offset, PAGE_SIZE);
if (*paddr != (vm_paddr_t)-1)
error = 0;
}
mtx_unlock(&vmmdev_mtx);
return (error);
}
static void
vmmdev_destroy(struct vmmdev_softc *sc, boolean_t unlink)
{
/*
* XXX must stop virtual machine instances that may be still
* running and cleanup their state.
*/
if (sc->cdev)
destroy_dev(sc->cdev);
if (sc->vm)
vm_destroy(sc->vm);
if (unlink) {
mtx_lock(&vmmdev_mtx);
SLIST_REMOVE(&head, sc, vmmdev_softc, link);
mtx_unlock(&vmmdev_mtx);
}
free(sc, M_VMMDEV);
}
static int
sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS)
{
int error;
char buf[VM_MAX_NAMELEN];
struct vmmdev_softc *sc;
strlcpy(buf, "beavis", sizeof(buf));
error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
if (error != 0 || req->newptr == NULL)
return (error);
/*
* XXX TODO if any process has this device open then fail
*/
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup(buf);
if (sc == NULL) {
mtx_unlock(&vmmdev_mtx);
return (EINVAL);
}
sc->cdev->si_drv1 = NULL;
mtx_unlock(&vmmdev_mtx);
vmmdev_destroy(sc, TRUE);
return (0);
}
SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW,
NULL, 0, sysctl_vmm_destroy, "A", NULL);
static struct cdevsw vmmdevsw = {
.d_name = "vmmdev",
.d_version = D_VERSION,
.d_ioctl = vmmdev_ioctl,
.d_mmap = vmmdev_mmap,
.d_read = vmmdev_rw,
.d_write = vmmdev_rw,
};
static int
sysctl_vmm_create(SYSCTL_HANDLER_ARGS)
{
int error;
struct vm *vm;
struct vmmdev_softc *sc, *sc2;
char buf[VM_MAX_NAMELEN];
strlcpy(buf, "beavis", sizeof(buf));
error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
if (error != 0 || req->newptr == NULL)
return (error);
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup(buf);
mtx_unlock(&vmmdev_mtx);
if (sc != NULL)
return (EEXIST);
vm = vm_create(buf);
if (vm == NULL)
return (EINVAL);
sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO);
sc->vm = vm;
/*
* Lookup the name again just in case somebody sneaked in when we
* dropped the lock.
*/
mtx_lock(&vmmdev_mtx);
sc2 = vmmdev_lookup(buf);
if (sc2 == NULL)
SLIST_INSERT_HEAD(&head, sc, link);
mtx_unlock(&vmmdev_mtx);
if (sc2 != NULL) {
vmmdev_destroy(sc, FALSE);
return (EEXIST);
}
sc->cdev = make_dev(&vmmdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
"vmm/%s", buf);
sc->cdev->si_drv1 = sc;
return (0);
}
SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW,
NULL, 0, sysctl_vmm_create, "A", NULL);
void
vmmdev_init(void)
{
mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF);
}
int
vmmdev_cleanup(void)
{
int error;
if (SLIST_EMPTY(&head))
error = 0;
else
error = EBUSY;
return (error);
}
|