Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/vmm_dev.c
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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/10.0/sys/amd64/vmm/vmm_dev.c 256651 2013-10-16 21:52:54Z neel $ 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/10.0/sys/amd64/vmm/vmm_dev.c 256651 2013-10-16 21:52:54Z neel $"); 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/pmap.h> 50 #include <machine/vmparam.h> 51 52 #include <machine/vmm.h> 53 #include "vmm_lapic.h" 54 #include "vmm_stat.h" 55 #include "vmm_mem.h" 56 #include "io/ppt.h" 57 #include <machine/vmm_dev.h> 58 59 struct vmmdev_softc { 60 struct vm *vm; /* vm instance cookie */ 61 struct cdev *cdev; 62 SLIST_ENTRY(vmmdev_softc) link; 63 int flags; 64 }; 65 #define VSC_LINKED 0x01 66 67 static SLIST_HEAD(, vmmdev_softc) head; 68 69 static struct mtx vmmdev_mtx; 70 71 static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev"); 72 73 SYSCTL_DECL(_hw_vmm); 74 75 static struct vmmdev_softc * 76 vmmdev_lookup(const char *name) 77 { 78 struct vmmdev_softc *sc; 79 80 #ifdef notyet /* XXX kernel is not compiled with invariants */ 81 mtx_assert(&vmmdev_mtx, MA_OWNED); 82 #endif 83 84 SLIST_FOREACH(sc, &head, link) { 85 if (strcmp(name, vm_name(sc->vm)) == 0) 86 break; 87 } 88 89 return (sc); 90 } 91 92 static struct vmmdev_softc * 93 vmmdev_lookup2(struct cdev *cdev) 94 { 95 96 return (cdev->si_drv1); 97 } 98 99 static int 100 vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags) 101 { 102 int error, off, c, prot; 103 vm_paddr_t gpa; 104 void *hpa, *cookie; 105 struct vmmdev_softc *sc; 106 107 static char zerobuf[PAGE_SIZE]; 108 109 error = 0; 110 sc = vmmdev_lookup2(cdev); 111 if (sc == NULL) 112 error = ENXIO; 113 114 prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ); 115 while (uio->uio_resid > 0 && error == 0) { 116 gpa = uio->uio_offset; 117 off = gpa & PAGE_MASK; 118 c = min(uio->uio_resid, PAGE_SIZE - off); 119 120 /* 121 * The VM has a hole in its physical memory map. If we want to 122 * use 'dd' to inspect memory beyond the hole we need to 123 * provide bogus data for memory that lies in the hole. 124 * 125 * Since this device does not support lseek(2), dd(1) will 126 * read(2) blocks of data to simulate the lseek(2). 127 */ 128 hpa = vm_gpa_hold(sc->vm, gpa, c, prot, &cookie); 129 if (hpa == NULL) { 130 if (uio->uio_rw == UIO_READ) 131 error = uiomove(zerobuf, c, uio); 132 else 133 error = EFAULT; 134 } else { 135 error = uiomove(hpa, c, uio); 136 vm_gpa_release(cookie); 137 } 138 } 139 return (error); 140 } 141 142 static int 143 vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag, 144 struct thread *td) 145 { 146 int error, vcpu, state_changed; 147 struct vmmdev_softc *sc; 148 struct vm_memory_segment *seg; 149 struct vm_register *vmreg; 150 struct vm_seg_desc* vmsegdesc; 151 struct vm_run *vmrun; 152 struct vm_event *vmevent; 153 struct vm_lapic_irq *vmirq; 154 struct vm_capability *vmcap; 155 struct vm_pptdev *pptdev; 156 struct vm_pptdev_mmio *pptmmio; 157 struct vm_pptdev_msi *pptmsi; 158 struct vm_pptdev_msix *pptmsix; 159 struct vm_nmi *vmnmi; 160 struct vm_stats *vmstats; 161 struct vm_stat_desc *statdesc; 162 struct vm_x2apic *x2apic; 163 struct vm_gpa_pte *gpapte; 164 165 sc = vmmdev_lookup2(cdev); 166 if (sc == NULL) 167 return (ENXIO); 168 169 vcpu = -1; 170 state_changed = 0; 171 172 /* 173 * Some VMM ioctls can operate only on vcpus that are not running. 174 */ 175 switch (cmd) { 176 case VM_RUN: 177 case VM_GET_REGISTER: 178 case VM_SET_REGISTER: 179 case VM_GET_SEGMENT_DESCRIPTOR: 180 case VM_SET_SEGMENT_DESCRIPTOR: 181 case VM_INJECT_EVENT: 182 case VM_GET_CAPABILITY: 183 case VM_SET_CAPABILITY: 184 case VM_PPTDEV_MSI: 185 case VM_PPTDEV_MSIX: 186 case VM_SET_X2APIC_STATE: 187 /* 188 * XXX fragile, handle with care 189 * Assumes that the first field of the ioctl data is the vcpu. 190 */ 191 vcpu = *(int *)data; 192 if (vcpu < 0 || vcpu >= VM_MAXCPU) { 193 error = EINVAL; 194 goto done; 195 } 196 197 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN); 198 if (error) 199 goto done; 200 201 state_changed = 1; 202 break; 203 204 case VM_MAP_PPTDEV_MMIO: 205 case VM_BIND_PPTDEV: 206 case VM_UNBIND_PPTDEV: 207 case VM_MAP_MEMORY: 208 /* 209 * ioctls that operate on the entire virtual machine must 210 * prevent all vcpus from running. 211 */ 212 error = 0; 213 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) { 214 error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN); 215 if (error) 216 break; 217 } 218 219 if (error) { 220 while (--vcpu >= 0) 221 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE); 222 goto done; 223 } 224 225 state_changed = 2; 226 break; 227 228 default: 229 break; 230 } 231 232 switch(cmd) { 233 case VM_RUN: 234 vmrun = (struct vm_run *)data; 235 error = vm_run(sc->vm, vmrun); 236 break; 237 case VM_STAT_DESC: { 238 statdesc = (struct vm_stat_desc *)data; 239 error = vmm_stat_desc_copy(statdesc->index, 240 statdesc->desc, sizeof(statdesc->desc)); 241 break; 242 } 243 case VM_STATS: { 244 CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS); 245 vmstats = (struct vm_stats *)data; 246 getmicrotime(&vmstats->tv); 247 error = vmm_stat_copy(sc->vm, vmstats->cpuid, 248 &vmstats->num_entries, vmstats->statbuf); 249 break; 250 } 251 case VM_PPTDEV_MSI: 252 pptmsi = (struct vm_pptdev_msi *)data; 253 error = ppt_setup_msi(sc->vm, pptmsi->vcpu, 254 pptmsi->bus, pptmsi->slot, pptmsi->func, 255 pptmsi->destcpu, pptmsi->vector, 256 pptmsi->numvec); 257 break; 258 case VM_PPTDEV_MSIX: 259 pptmsix = (struct vm_pptdev_msix *)data; 260 error = ppt_setup_msix(sc->vm, pptmsix->vcpu, 261 pptmsix->bus, pptmsix->slot, 262 pptmsix->func, pptmsix->idx, 263 pptmsix->msg, pptmsix->vector_control, 264 pptmsix->addr); 265 break; 266 case VM_MAP_PPTDEV_MMIO: 267 pptmmio = (struct vm_pptdev_mmio *)data; 268 error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot, 269 pptmmio->func, pptmmio->gpa, pptmmio->len, 270 pptmmio->hpa); 271 break; 272 case VM_BIND_PPTDEV: 273 pptdev = (struct vm_pptdev *)data; 274 error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 275 pptdev->func); 276 break; 277 case VM_UNBIND_PPTDEV: 278 pptdev = (struct vm_pptdev *)data; 279 error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot, 280 pptdev->func); 281 break; 282 case VM_INJECT_EVENT: 283 vmevent = (struct vm_event *)data; 284 error = vm_inject_event(sc->vm, vmevent->cpuid, vmevent->type, 285 vmevent->vector, 286 vmevent->error_code, 287 vmevent->error_code_valid); 288 break; 289 case VM_INJECT_NMI: 290 vmnmi = (struct vm_nmi *)data; 291 error = vm_inject_nmi(sc->vm, vmnmi->cpuid); 292 break; 293 case VM_LAPIC_IRQ: 294 vmirq = (struct vm_lapic_irq *)data; 295 error = lapic_set_intr(sc->vm, vmirq->cpuid, vmirq->vector); 296 break; 297 case VM_MAP_MEMORY: 298 seg = (struct vm_memory_segment *)data; 299 error = vm_malloc(sc->vm, seg->gpa, seg->len); 300 break; 301 case VM_GET_MEMORY_SEG: 302 seg = (struct vm_memory_segment *)data; 303 seg->len = 0; 304 (void)vm_gpabase2memseg(sc->vm, seg->gpa, seg); 305 error = 0; 306 break; 307 case VM_GET_REGISTER: 308 vmreg = (struct vm_register *)data; 309 error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum, 310 &vmreg->regval); 311 break; 312 case VM_SET_REGISTER: 313 vmreg = (struct vm_register *)data; 314 error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum, 315 vmreg->regval); 316 break; 317 case VM_SET_SEGMENT_DESCRIPTOR: 318 vmsegdesc = (struct vm_seg_desc *)data; 319 error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid, 320 vmsegdesc->regnum, 321 &vmsegdesc->desc); 322 break; 323 case VM_GET_SEGMENT_DESCRIPTOR: 324 vmsegdesc = (struct vm_seg_desc *)data; 325 error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid, 326 vmsegdesc->regnum, 327 &vmsegdesc->desc); 328 break; 329 case VM_GET_CAPABILITY: 330 vmcap = (struct vm_capability *)data; 331 error = vm_get_capability(sc->vm, vmcap->cpuid, 332 vmcap->captype, 333 &vmcap->capval); 334 break; 335 case VM_SET_CAPABILITY: 336 vmcap = (struct vm_capability *)data; 337 error = vm_set_capability(sc->vm, vmcap->cpuid, 338 vmcap->captype, 339 vmcap->capval); 340 break; 341 case VM_SET_X2APIC_STATE: 342 x2apic = (struct vm_x2apic *)data; 343 error = vm_set_x2apic_state(sc->vm, 344 x2apic->cpuid, x2apic->state); 345 break; 346 case VM_GET_X2APIC_STATE: 347 x2apic = (struct vm_x2apic *)data; 348 error = vm_get_x2apic_state(sc->vm, 349 x2apic->cpuid, &x2apic->state); 350 break; 351 case VM_GET_GPA_PMAP: 352 gpapte = (struct vm_gpa_pte *)data; 353 pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)), 354 gpapte->gpa, gpapte->pte, &gpapte->ptenum); 355 error = 0; 356 break; 357 default: 358 error = ENOTTY; 359 break; 360 } 361 362 if (state_changed == 1) { 363 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE); 364 } else if (state_changed == 2) { 365 for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) 366 vcpu_set_state(sc->vm, vcpu, VCPU_IDLE); 367 } 368 369 done: 370 /* Make sure that no handler returns a bogus value like ERESTART */ 371 KASSERT(error >= 0, ("vmmdev_ioctl: invalid error return %d", error)); 372 return (error); 373 } 374 375 static int 376 vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, 377 vm_size_t size, struct vm_object **object, int nprot) 378 { 379 int error; 380 struct vmmdev_softc *sc; 381 382 sc = vmmdev_lookup2(cdev); 383 if (sc != NULL && (nprot & PROT_EXEC) == 0) 384 error = vm_get_memobj(sc->vm, *offset, size, offset, object); 385 else 386 error = EINVAL; 387 388 return (error); 389 } 390 391 static void 392 vmmdev_destroy(void *arg) 393 { 394 395 struct vmmdev_softc *sc = arg; 396 397 if (sc->cdev != NULL) 398 destroy_dev(sc->cdev); 399 400 if (sc->vm != NULL) 401 vm_destroy(sc->vm); 402 403 if ((sc->flags & VSC_LINKED) != 0) { 404 mtx_lock(&vmmdev_mtx); 405 SLIST_REMOVE(&head, sc, vmmdev_softc, link); 406 mtx_unlock(&vmmdev_mtx); 407 } 408 409 free(sc, M_VMMDEV); 410 } 411 412 static int 413 sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS) 414 { 415 int error; 416 char buf[VM_MAX_NAMELEN]; 417 struct vmmdev_softc *sc; 418 struct cdev *cdev; 419 420 strlcpy(buf, "beavis", sizeof(buf)); 421 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 422 if (error != 0 || req->newptr == NULL) 423 return (error); 424 425 mtx_lock(&vmmdev_mtx); 426 sc = vmmdev_lookup(buf); 427 if (sc == NULL || sc->cdev == NULL) { 428 mtx_unlock(&vmmdev_mtx); 429 return (EINVAL); 430 } 431 432 /* 433 * The 'cdev' will be destroyed asynchronously when 'si_threadcount' 434 * goes down to 0 so we should not do it again in the callback. 435 */ 436 cdev = sc->cdev; 437 sc->cdev = NULL; 438 mtx_unlock(&vmmdev_mtx); 439 440 /* 441 * Schedule the 'cdev' to be destroyed: 442 * 443 * - any new operations on this 'cdev' will return an error (ENXIO). 444 * 445 * - when the 'si_threadcount' dwindles down to zero the 'cdev' will 446 * be destroyed and the callback will be invoked in a taskqueue 447 * context. 448 */ 449 destroy_dev_sched_cb(cdev, vmmdev_destroy, sc); 450 451 return (0); 452 } 453 SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW, 454 NULL, 0, sysctl_vmm_destroy, "A", NULL); 455 456 static struct cdevsw vmmdevsw = { 457 .d_name = "vmmdev", 458 .d_version = D_VERSION, 459 .d_ioctl = vmmdev_ioctl, 460 .d_mmap_single = vmmdev_mmap_single, 461 .d_read = vmmdev_rw, 462 .d_write = vmmdev_rw, 463 }; 464 465 static int 466 sysctl_vmm_create(SYSCTL_HANDLER_ARGS) 467 { 468 int error; 469 struct vm *vm; 470 struct cdev *cdev; 471 struct vmmdev_softc *sc, *sc2; 472 char buf[VM_MAX_NAMELEN]; 473 474 strlcpy(buf, "beavis", sizeof(buf)); 475 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 476 if (error != 0 || req->newptr == NULL) 477 return (error); 478 479 mtx_lock(&vmmdev_mtx); 480 sc = vmmdev_lookup(buf); 481 mtx_unlock(&vmmdev_mtx); 482 if (sc != NULL) 483 return (EEXIST); 484 485 error = vm_create(buf, &vm); 486 if (error != 0) 487 return (error); 488 489 sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO); 490 sc->vm = vm; 491 492 /* 493 * Lookup the name again just in case somebody sneaked in when we 494 * dropped the lock. 495 */ 496 mtx_lock(&vmmdev_mtx); 497 sc2 = vmmdev_lookup(buf); 498 if (sc2 == NULL) { 499 SLIST_INSERT_HEAD(&head, sc, link); 500 sc->flags |= VSC_LINKED; 501 } 502 mtx_unlock(&vmmdev_mtx); 503 504 if (sc2 != NULL) { 505 vmmdev_destroy(sc); 506 return (EEXIST); 507 } 508 509 error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL, 510 UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf); 511 if (error != 0) { 512 vmmdev_destroy(sc); 513 return (error); 514 } 515 516 mtx_lock(&vmmdev_mtx); 517 sc->cdev = cdev; 518 sc->cdev->si_drv1 = sc; 519 mtx_unlock(&vmmdev_mtx); 520 521 return (0); 522 } 523 SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW, 524 NULL, 0, sysctl_vmm_create, "A", NULL); 525 526 void 527 vmmdev_init(void) 528 { 529 mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF); 530 } 531 532 int 533 vmmdev_cleanup(void) 534 { 535 int error; 536 537 if (SLIST_EMPTY(&head)) 538 error = 0; 539 else 540 error = EBUSY; 541 542 return (error); 543 }
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