1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Adjunct processor matrix VFIO device driver callbacks. 4 * 5 * Copyright IBM Corp. 2018 6 * 7 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com> 8 * Halil Pasic <pasic@linux.ibm.com> 9 * Pierre Morel <pmorel@linux.ibm.com> 10 */ 11 #include <linux/string.h> 12 #include <linux/vfio.h> 13 #include <linux/device.h> 14 #include <linux/list.h> 15 #include <linux/ctype.h> 16 #include <linux/bitops.h> 17 #include <linux/kvm_host.h> 18 #include <linux/module.h> 19 #include <linux/uuid.h> 20 #include <asm/kvm.h> 21 #include <asm/zcrypt.h> 22 23 #include "vfio_ap_private.h" 24 #include "vfio_ap_debug.h" 25 26 #define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough" 27 #define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device" 28 29 #define AP_QUEUE_ASSIGNED "assigned" 30 #define AP_QUEUE_UNASSIGNED "unassigned" 31 #define AP_QUEUE_IN_USE "in use" 32 33 #define MAX_RESET_CHECK_WAIT 200 /* Sleep max 200ms for reset check */ 34 #define AP_RESET_INTERVAL 20 /* Reset sleep interval (20ms) */ 35 36 static int vfio_ap_mdev_reset_queues(struct ap_queue_table *qtable); 37 static struct vfio_ap_queue *vfio_ap_find_queue(int apqn); 38 static const struct vfio_device_ops vfio_ap_matrix_dev_ops; 39 static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q); 40 41 /** 42 * get_update_locks_for_kvm: Acquire the locks required to dynamically update a 43 * KVM guest's APCB in the proper order. 44 * 45 * @kvm: a pointer to a struct kvm object containing the KVM guest's APCB. 46 * 47 * The proper locking order is: 48 * 1. matrix_dev->guests_lock: required to use the KVM pointer to update a KVM 49 * guest's APCB. 50 * 2. kvm->lock: required to update a guest's APCB 51 * 3. matrix_dev->mdevs_lock: required to access data stored in a matrix_mdev 52 * 53 * Note: If @kvm is NULL, the KVM lock will not be taken. 54 */ 55 static inline void get_update_locks_for_kvm(struct kvm *kvm) 56 { 57 mutex_lock(&matrix_dev->guests_lock); 58 if (kvm) 59 mutex_lock(&kvm->lock); 60 mutex_lock(&matrix_dev->mdevs_lock); 61 } 62 63 /** 64 * release_update_locks_for_kvm: Release the locks used to dynamically update a 65 * KVM guest's APCB in the proper order. 66 * 67 * @kvm: a pointer to a struct kvm object containing the KVM guest's APCB. 68 * 69 * The proper unlocking order is: 70 * 1. matrix_dev->mdevs_lock 71 * 2. kvm->lock 72 * 3. matrix_dev->guests_lock 73 * 74 * Note: If @kvm is NULL, the KVM lock will not be released. 75 */ 76 static inline void release_update_locks_for_kvm(struct kvm *kvm) 77 { 78 mutex_unlock(&matrix_dev->mdevs_lock); 79 if (kvm) 80 mutex_unlock(&kvm->lock); 81 mutex_unlock(&matrix_dev->guests_lock); 82 } 83 84 /** 85 * get_update_locks_for_mdev: Acquire the locks required to dynamically update a 86 * KVM guest's APCB in the proper order. 87 * 88 * @matrix_mdev: a pointer to a struct ap_matrix_mdev object containing the AP 89 * configuration data to use to update a KVM guest's APCB. 90 * 91 * The proper locking order is: 92 * 1. matrix_dev->guests_lock: required to use the KVM pointer to update a KVM 93 * guest's APCB. 94 * 2. matrix_mdev->kvm->lock: required to update a guest's APCB 95 * 3. matrix_dev->mdevs_lock: required to access data stored in a matrix_mdev 96 * 97 * Note: If @matrix_mdev is NULL or is not attached to a KVM guest, the KVM 98 * lock will not be taken. 99 */ 100 static inline void get_update_locks_for_mdev(struct ap_matrix_mdev *matrix_mdev) 101 { 102 mutex_lock(&matrix_dev->guests_lock); 103 if (matrix_mdev && matrix_mdev->kvm) 104 mutex_lock(&matrix_mdev->kvm->lock); 105 mutex_lock(&matrix_dev->mdevs_lock); 106 } 107 108 /** 109 * release_update_locks_for_mdev: Release the locks used to dynamically update a 110 * KVM guest's APCB in the proper order. 111 * 112 * @matrix_mdev: a pointer to a struct ap_matrix_mdev object containing the AP 113 * configuration data to use to update a KVM guest's APCB. 114 * 115 * The proper unlocking order is: 116 * 1. matrix_dev->mdevs_lock 117 * 2. matrix_mdev->kvm->lock 118 * 3. matrix_dev->guests_lock 119 * 120 * Note: If @matrix_mdev is NULL or is not attached to a KVM guest, the KVM 121 * lock will not be released. 122 */ 123 static inline void release_update_locks_for_mdev(struct ap_matrix_mdev *matrix_mdev) 124 { 125 mutex_unlock(&matrix_dev->mdevs_lock); 126 if (matrix_mdev && matrix_mdev->kvm) 127 mutex_unlock(&matrix_mdev->kvm->lock); 128 mutex_unlock(&matrix_dev->guests_lock); 129 } 130 131 /** 132 * get_update_locks_by_apqn: Find the mdev to which an APQN is assigned and 133 * acquire the locks required to update the APCB of 134 * the KVM guest to which the mdev is attached. 135 * 136 * @apqn: the APQN of a queue device. 137 * 138 * The proper locking order is: 139 * 1. matrix_dev->guests_lock: required to use the KVM pointer to update a KVM 140 * guest's APCB. 141 * 2. matrix_mdev->kvm->lock: required to update a guest's APCB 142 * 3. matrix_dev->mdevs_lock: required to access data stored in a matrix_mdev 143 * 144 * Note: If @apqn is not assigned to a matrix_mdev, the matrix_mdev->kvm->lock 145 * will not be taken. 146 * 147 * Return: the ap_matrix_mdev object to which @apqn is assigned or NULL if @apqn 148 * is not assigned to an ap_matrix_mdev. 149 */ 150 static struct ap_matrix_mdev *get_update_locks_by_apqn(int apqn) 151 { 152 struct ap_matrix_mdev *matrix_mdev; 153 154 mutex_lock(&matrix_dev->guests_lock); 155 156 list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { 157 if (test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm) && 158 test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm)) { 159 if (matrix_mdev->kvm) 160 mutex_lock(&matrix_mdev->kvm->lock); 161 162 mutex_lock(&matrix_dev->mdevs_lock); 163 164 return matrix_mdev; 165 } 166 } 167 168 mutex_lock(&matrix_dev->mdevs_lock); 169 170 return NULL; 171 } 172 173 /** 174 * get_update_locks_for_queue: get the locks required to update the APCB of the 175 * KVM guest to which the matrix mdev linked to a 176 * vfio_ap_queue object is attached. 177 * 178 * @q: a pointer to a vfio_ap_queue object. 179 * 180 * The proper locking order is: 181 * 1. q->matrix_dev->guests_lock: required to use the KVM pointer to update a 182 * KVM guest's APCB. 183 * 2. q->matrix_mdev->kvm->lock: required to update a guest's APCB 184 * 3. matrix_dev->mdevs_lock: required to access data stored in matrix_mdev 185 * 186 * Note: if @queue is not linked to an ap_matrix_mdev object, the KVM lock 187 * will not be taken. 188 */ 189 static inline void get_update_locks_for_queue(struct vfio_ap_queue *q) 190 { 191 mutex_lock(&matrix_dev->guests_lock); 192 if (q->matrix_mdev && q->matrix_mdev->kvm) 193 mutex_lock(&q->matrix_mdev->kvm->lock); 194 mutex_lock(&matrix_dev->mdevs_lock); 195 } 196 197 /** 198 * vfio_ap_mdev_get_queue - retrieve a queue with a specific APQN from a 199 * hash table of queues assigned to a matrix mdev 200 * @matrix_mdev: the matrix mdev 201 * @apqn: The APQN of a queue device 202 * 203 * Return: the pointer to the vfio_ap_queue struct representing the queue or 204 * NULL if the queue is not assigned to @matrix_mdev 205 */ 206 static struct vfio_ap_queue *vfio_ap_mdev_get_queue( 207 struct ap_matrix_mdev *matrix_mdev, 208 int apqn) 209 { 210 struct vfio_ap_queue *q; 211 212 hash_for_each_possible(matrix_mdev->qtable.queues, q, mdev_qnode, 213 apqn) { 214 if (q && q->apqn == apqn) 215 return q; 216 } 217 218 return NULL; 219 } 220 221 /** 222 * vfio_ap_wait_for_irqclear - clears the IR bit or gives up after 5 tries 223 * @apqn: The AP Queue number 224 * 225 * Checks the IRQ bit for the status of this APQN using ap_tapq. 226 * Returns if the ap_tapq function succeeded and the bit is clear. 227 * Returns if ap_tapq function failed with invalid, deconfigured or 228 * checkstopped AP. 229 * Otherwise retries up to 5 times after waiting 20ms. 230 */ 231 static void vfio_ap_wait_for_irqclear(int apqn) 232 { 233 struct ap_queue_status status; 234 int retry = 5; 235 236 do { 237 status = ap_tapq(apqn, NULL); 238 switch (status.response_code) { 239 case AP_RESPONSE_NORMAL: 240 case AP_RESPONSE_RESET_IN_PROGRESS: 241 if (!status.irq_enabled) 242 return; 243 fallthrough; 244 case AP_RESPONSE_BUSY: 245 msleep(20); 246 break; 247 case AP_RESPONSE_Q_NOT_AVAIL: 248 case AP_RESPONSE_DECONFIGURED: 249 case AP_RESPONSE_CHECKSTOPPED: 250 default: 251 WARN_ONCE(1, "%s: tapq rc %02x: %04x\n", __func__, 252 status.response_code, apqn); 253 return; 254 } 255 } while (--retry); 256 257 WARN_ONCE(1, "%s: tapq rc %02x: %04x could not clear IR bit\n", 258 __func__, status.response_code, apqn); 259 } 260 261 /** 262 * vfio_ap_free_aqic_resources - free vfio_ap_queue resources 263 * @q: The vfio_ap_queue 264 * 265 * Unregisters the ISC in the GIB when the saved ISC not invalid. 266 * Unpins the guest's page holding the NIB when it exists. 267 * Resets the saved_iova and saved_isc to invalid values. 268 */ 269 static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q) 270 { 271 if (!q) 272 return; 273 if (q->saved_isc != VFIO_AP_ISC_INVALID && 274 !WARN_ON(!(q->matrix_mdev && q->matrix_mdev->kvm))) { 275 kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc); 276 q->saved_isc = VFIO_AP_ISC_INVALID; 277 } 278 if (q->saved_iova && !WARN_ON(!q->matrix_mdev)) { 279 vfio_unpin_pages(&q->matrix_mdev->vdev, q->saved_iova, 1); 280 q->saved_iova = 0; 281 } 282 } 283 284 /** 285 * vfio_ap_irq_disable - disables and clears an ap_queue interrupt 286 * @q: The vfio_ap_queue 287 * 288 * Uses ap_aqic to disable the interruption and in case of success, reset 289 * in progress or IRQ disable command already proceeded: calls 290 * vfio_ap_wait_for_irqclear() to check for the IRQ bit to be clear 291 * and calls vfio_ap_free_aqic_resources() to free the resources associated 292 * with the AP interrupt handling. 293 * 294 * In the case the AP is busy, or a reset is in progress, 295 * retries after 20ms, up to 5 times. 296 * 297 * Returns if ap_aqic function failed with invalid, deconfigured or 298 * checkstopped AP. 299 * 300 * Return: &struct ap_queue_status 301 */ 302 static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q) 303 { 304 union ap_qirq_ctrl aqic_gisa = { .value = 0 }; 305 struct ap_queue_status status; 306 int retries = 5; 307 308 do { 309 status = ap_aqic(q->apqn, aqic_gisa, 0); 310 switch (status.response_code) { 311 case AP_RESPONSE_OTHERWISE_CHANGED: 312 case AP_RESPONSE_NORMAL: 313 vfio_ap_wait_for_irqclear(q->apqn); 314 goto end_free; 315 case AP_RESPONSE_RESET_IN_PROGRESS: 316 case AP_RESPONSE_BUSY: 317 msleep(20); 318 break; 319 case AP_RESPONSE_Q_NOT_AVAIL: 320 case AP_RESPONSE_DECONFIGURED: 321 case AP_RESPONSE_CHECKSTOPPED: 322 case AP_RESPONSE_INVALID_ADDRESS: 323 default: 324 /* All cases in default means AP not operational */ 325 WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__, 326 status.response_code); 327 goto end_free; 328 } 329 } while (retries--); 330 331 WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__, 332 status.response_code); 333 end_free: 334 vfio_ap_free_aqic_resources(q); 335 return status; 336 } 337 338 /** 339 * vfio_ap_validate_nib - validate a notification indicator byte (nib) address. 340 * 341 * @vcpu: the object representing the vcpu executing the PQAP(AQIC) instruction. 342 * @nib: the location for storing the nib address. 343 * 344 * When the PQAP(AQIC) instruction is executed, general register 2 contains the 345 * address of the notification indicator byte (nib) used for IRQ notification. 346 * This function parses and validates the nib from gr2. 347 * 348 * Return: returns zero if the nib address is a valid; otherwise, returns 349 * -EINVAL. 350 */ 351 static int vfio_ap_validate_nib(struct kvm_vcpu *vcpu, dma_addr_t *nib) 352 { 353 *nib = vcpu->run->s.regs.gprs[2]; 354 355 if (!*nib) 356 return -EINVAL; 357 if (kvm_is_error_hva(gfn_to_hva(vcpu->kvm, *nib >> PAGE_SHIFT))) 358 return -EINVAL; 359 360 return 0; 361 } 362 363 /** 364 * vfio_ap_irq_enable - Enable Interruption for a APQN 365 * 366 * @q: the vfio_ap_queue holding AQIC parameters 367 * @isc: the guest ISC to register with the GIB interface 368 * @vcpu: the vcpu object containing the registers specifying the parameters 369 * passed to the PQAP(AQIC) instruction. 370 * 371 * Pin the NIB saved in *q 372 * Register the guest ISC to GIB interface and retrieve the 373 * host ISC to issue the host side PQAP/AQIC 374 * 375 * Response.status may be set to AP_RESPONSE_INVALID_ADDRESS in case the 376 * vfio_pin_pages failed. 377 * 378 * Otherwise return the ap_queue_status returned by the ap_aqic(), 379 * all retry handling will be done by the guest. 380 * 381 * Return: &struct ap_queue_status 382 */ 383 static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q, 384 int isc, 385 struct kvm_vcpu *vcpu) 386 { 387 union ap_qirq_ctrl aqic_gisa = { .value = 0 }; 388 struct ap_queue_status status = {}; 389 struct kvm_s390_gisa *gisa; 390 struct page *h_page; 391 int nisc; 392 struct kvm *kvm; 393 phys_addr_t h_nib; 394 dma_addr_t nib; 395 int ret; 396 397 /* Verify that the notification indicator byte address is valid */ 398 if (vfio_ap_validate_nib(vcpu, &nib)) { 399 VFIO_AP_DBF_WARN("%s: invalid NIB address: nib=%pad, apqn=%#04x\n", 400 __func__, &nib, q->apqn); 401 402 status.response_code = AP_RESPONSE_INVALID_ADDRESS; 403 return status; 404 } 405 406 ret = vfio_pin_pages(&q->matrix_mdev->vdev, nib, 1, 407 IOMMU_READ | IOMMU_WRITE, &h_page); 408 switch (ret) { 409 case 1: 410 break; 411 default: 412 VFIO_AP_DBF_WARN("%s: vfio_pin_pages failed: rc=%d," 413 "nib=%pad, apqn=%#04x\n", 414 __func__, ret, &nib, q->apqn); 415 416 status.response_code = AP_RESPONSE_INVALID_ADDRESS; 417 return status; 418 } 419 420 kvm = q->matrix_mdev->kvm; 421 gisa = kvm->arch.gisa_int.origin; 422 423 h_nib = page_to_phys(h_page) | (nib & ~PAGE_MASK); 424 aqic_gisa.gisc = isc; 425 426 nisc = kvm_s390_gisc_register(kvm, isc); 427 if (nisc < 0) { 428 VFIO_AP_DBF_WARN("%s: gisc registration failed: nisc=%d, isc=%d, apqn=%#04x\n", 429 __func__, nisc, isc, q->apqn); 430 431 status.response_code = AP_RESPONSE_INVALID_GISA; 432 return status; 433 } 434 435 aqic_gisa.isc = nisc; 436 aqic_gisa.ir = 1; 437 aqic_gisa.gisa = virt_to_phys(gisa) >> 4; 438 439 status = ap_aqic(q->apqn, aqic_gisa, h_nib); 440 switch (status.response_code) { 441 case AP_RESPONSE_NORMAL: 442 /* See if we did clear older IRQ configuration */ 443 vfio_ap_free_aqic_resources(q); 444 q->saved_iova = nib; 445 q->saved_isc = isc; 446 break; 447 case AP_RESPONSE_OTHERWISE_CHANGED: 448 /* We could not modify IRQ settings: clear new configuration */ 449 vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1); 450 kvm_s390_gisc_unregister(kvm, isc); 451 break; 452 default: 453 pr_warn("%s: apqn %04x: response: %02x\n", __func__, q->apqn, 454 status.response_code); 455 vfio_ap_irq_disable(q); 456 break; 457 } 458 459 if (status.response_code != AP_RESPONSE_NORMAL) { 460 VFIO_AP_DBF_WARN("%s: PQAP(AQIC) failed with status=%#02x: " 461 "zone=%#x, ir=%#x, gisc=%#x, f=%#x," 462 "gisa=%#x, isc=%#x, apqn=%#04x\n", 463 __func__, status.response_code, 464 aqic_gisa.zone, aqic_gisa.ir, aqic_gisa.gisc, 465 aqic_gisa.gf, aqic_gisa.gisa, aqic_gisa.isc, 466 q->apqn); 467 } 468 469 return status; 470 } 471 472 /** 473 * vfio_ap_le_guid_to_be_uuid - convert a little endian guid array into an array 474 * of big endian elements that can be passed by 475 * value to an s390dbf sprintf event function to 476 * format a UUID string. 477 * 478 * @guid: the object containing the little endian guid 479 * @uuid: a six-element array of long values that can be passed by value as 480 * arguments for a formatting string specifying a UUID. 481 * 482 * The S390 Debug Feature (s390dbf) allows the use of "%s" in the sprintf 483 * event functions if the memory for the passed string is available as long as 484 * the debug feature exists. Since a mediated device can be removed at any 485 * time, it's name can not be used because %s passes the reference to the string 486 * in memory and the reference will go stale once the device is removed . 487 * 488 * The s390dbf string formatting function allows a maximum of 9 arguments for a 489 * message to be displayed in the 'sprintf' view. In order to use the bytes 490 * comprising the mediated device's UUID to display the mediated device name, 491 * they will have to be converted into an array whose elements can be passed by 492 * value to sprintf. For example: 493 * 494 * guid array: { 83, 78, 17, 62, bb, f1, f0, 47, 91, 4d, 32, a2, 2e, 3a, 88, 04 } 495 * mdev name: 62177883-f1bb-47f0-914d-32a22e3a8804 496 * array returned: { 62177883, f1bb, 47f0, 914d, 32a2, 2e3a8804 } 497 * formatting string: "%08lx-%04lx-%04lx-%04lx-%02lx%04lx" 498 */ 499 static void vfio_ap_le_guid_to_be_uuid(guid_t *guid, unsigned long *uuid) 500 { 501 /* 502 * The input guid is ordered in little endian, so it needs to be 503 * reordered for displaying a UUID as a string. This specifies the 504 * guid indices in proper order. 505 */ 506 uuid[0] = le32_to_cpup((__le32 *)guid); 507 uuid[1] = le16_to_cpup((__le16 *)&guid->b[4]); 508 uuid[2] = le16_to_cpup((__le16 *)&guid->b[6]); 509 uuid[3] = *((__u16 *)&guid->b[8]); 510 uuid[4] = *((__u16 *)&guid->b[10]); 511 uuid[5] = *((__u32 *)&guid->b[12]); 512 } 513 514 /** 515 * handle_pqap - PQAP instruction callback 516 * 517 * @vcpu: The vcpu on which we received the PQAP instruction 518 * 519 * Get the general register contents to initialize internal variables. 520 * REG[0]: APQN 521 * REG[1]: IR and ISC 522 * REG[2]: NIB 523 * 524 * Response.status may be set to following Response Code: 525 * - AP_RESPONSE_Q_NOT_AVAIL: if the queue is not available 526 * - AP_RESPONSE_DECONFIGURED: if the queue is not configured 527 * - AP_RESPONSE_NORMAL (0) : in case of success 528 * Check vfio_ap_setirq() and vfio_ap_clrirq() for other possible RC. 529 * We take the matrix_dev lock to ensure serialization on queues and 530 * mediated device access. 531 * 532 * Return: 0 if we could handle the request inside KVM. 533 * Otherwise, returns -EOPNOTSUPP to let QEMU handle the fault. 534 */ 535 static int handle_pqap(struct kvm_vcpu *vcpu) 536 { 537 uint64_t status; 538 uint16_t apqn; 539 unsigned long uuid[6]; 540 struct vfio_ap_queue *q; 541 struct ap_queue_status qstatus = { 542 .response_code = AP_RESPONSE_Q_NOT_AVAIL, }; 543 struct ap_matrix_mdev *matrix_mdev; 544 545 apqn = vcpu->run->s.regs.gprs[0] & 0xffff; 546 547 /* If we do not use the AIV facility just go to userland */ 548 if (!(vcpu->arch.sie_block->eca & ECA_AIV)) { 549 VFIO_AP_DBF_WARN("%s: AIV facility not installed: apqn=0x%04x, eca=0x%04x\n", 550 __func__, apqn, vcpu->arch.sie_block->eca); 551 552 return -EOPNOTSUPP; 553 } 554 555 mutex_lock(&matrix_dev->mdevs_lock); 556 557 if (!vcpu->kvm->arch.crypto.pqap_hook) { 558 VFIO_AP_DBF_WARN("%s: PQAP(AQIC) hook not registered with the vfio_ap driver: apqn=0x%04x\n", 559 __func__, apqn); 560 561 goto out_unlock; 562 } 563 564 matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook, 565 struct ap_matrix_mdev, pqap_hook); 566 567 /* If the there is no guest using the mdev, there is nothing to do */ 568 if (!matrix_mdev->kvm) { 569 vfio_ap_le_guid_to_be_uuid(&matrix_mdev->mdev->uuid, uuid); 570 VFIO_AP_DBF_WARN("%s: mdev %08lx-%04lx-%04lx-%04lx-%04lx%08lx not in use: apqn=0x%04x\n", 571 __func__, uuid[0], uuid[1], uuid[2], 572 uuid[3], uuid[4], uuid[5], apqn); 573 goto out_unlock; 574 } 575 576 q = vfio_ap_mdev_get_queue(matrix_mdev, apqn); 577 if (!q) { 578 VFIO_AP_DBF_WARN("%s: Queue %02x.%04x not bound to the vfio_ap driver\n", 579 __func__, AP_QID_CARD(apqn), 580 AP_QID_QUEUE(apqn)); 581 goto out_unlock; 582 } 583 584 status = vcpu->run->s.regs.gprs[1]; 585 586 /* If IR bit(16) is set we enable the interrupt */ 587 if ((status >> (63 - 16)) & 0x01) 588 qstatus = vfio_ap_irq_enable(q, status & 0x07, vcpu); 589 else 590 qstatus = vfio_ap_irq_disable(q); 591 592 out_unlock: 593 memcpy(&vcpu->run->s.regs.gprs[1], &qstatus, sizeof(qstatus)); 594 vcpu->run->s.regs.gprs[1] >>= 32; 595 mutex_unlock(&matrix_dev->mdevs_lock); 596 return 0; 597 } 598 599 static void vfio_ap_matrix_init(struct ap_config_info *info, 600 struct ap_matrix *matrix) 601 { 602 matrix->apm_max = info->apxa ? info->na : 63; 603 matrix->aqm_max = info->apxa ? info->nd : 15; 604 matrix->adm_max = info->apxa ? info->nd : 15; 605 } 606 607 static void vfio_ap_mdev_update_guest_apcb(struct ap_matrix_mdev *matrix_mdev) 608 { 609 if (matrix_mdev->kvm) 610 kvm_arch_crypto_set_masks(matrix_mdev->kvm, 611 matrix_mdev->shadow_apcb.apm, 612 matrix_mdev->shadow_apcb.aqm, 613 matrix_mdev->shadow_apcb.adm); 614 } 615 616 static bool vfio_ap_mdev_filter_cdoms(struct ap_matrix_mdev *matrix_mdev) 617 { 618 DECLARE_BITMAP(prev_shadow_adm, AP_DOMAINS); 619 620 bitmap_copy(prev_shadow_adm, matrix_mdev->shadow_apcb.adm, AP_DOMAINS); 621 bitmap_and(matrix_mdev->shadow_apcb.adm, matrix_mdev->matrix.adm, 622 (unsigned long *)matrix_dev->info.adm, AP_DOMAINS); 623 624 return !bitmap_equal(prev_shadow_adm, matrix_mdev->shadow_apcb.adm, 625 AP_DOMAINS); 626 } 627 628 /* 629 * vfio_ap_mdev_filter_matrix - filter the APQNs assigned to the matrix mdev 630 * to ensure no queue devices are passed through to 631 * the guest that are not bound to the vfio_ap 632 * device driver. 633 * 634 * @matrix_mdev: the matrix mdev whose matrix is to be filtered. 635 * 636 * Note: If an APQN referencing a queue device that is not bound to the vfio_ap 637 * driver, its APID will be filtered from the guest's APCB. The matrix 638 * structure precludes filtering an individual APQN, so its APID will be 639 * filtered. 640 * 641 * Return: a boolean value indicating whether the KVM guest's APCB was changed 642 * by the filtering or not. 643 */ 644 static bool vfio_ap_mdev_filter_matrix(unsigned long *apm, unsigned long *aqm, 645 struct ap_matrix_mdev *matrix_mdev) 646 { 647 unsigned long apid, apqi, apqn; 648 DECLARE_BITMAP(prev_shadow_apm, AP_DEVICES); 649 DECLARE_BITMAP(prev_shadow_aqm, AP_DOMAINS); 650 struct vfio_ap_queue *q; 651 652 bitmap_copy(prev_shadow_apm, matrix_mdev->shadow_apcb.apm, AP_DEVICES); 653 bitmap_copy(prev_shadow_aqm, matrix_mdev->shadow_apcb.aqm, AP_DOMAINS); 654 vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb); 655 656 /* 657 * Copy the adapters, domains and control domains to the shadow_apcb 658 * from the matrix mdev, but only those that are assigned to the host's 659 * AP configuration. 660 */ 661 bitmap_and(matrix_mdev->shadow_apcb.apm, matrix_mdev->matrix.apm, 662 (unsigned long *)matrix_dev->info.apm, AP_DEVICES); 663 bitmap_and(matrix_mdev->shadow_apcb.aqm, matrix_mdev->matrix.aqm, 664 (unsigned long *)matrix_dev->info.aqm, AP_DOMAINS); 665 666 for_each_set_bit_inv(apid, apm, AP_DEVICES) { 667 for_each_set_bit_inv(apqi, aqm, AP_DOMAINS) { 668 /* 669 * If the APQN is not bound to the vfio_ap device 670 * driver, then we can't assign it to the guest's 671 * AP configuration. The AP architecture won't 672 * allow filtering of a single APQN, so let's filter 673 * the APID since an adapter represents a physical 674 * hardware device. 675 */ 676 apqn = AP_MKQID(apid, apqi); 677 q = vfio_ap_mdev_get_queue(matrix_mdev, apqn); 678 if (!q || q->reset_rc) { 679 clear_bit_inv(apid, 680 matrix_mdev->shadow_apcb.apm); 681 break; 682 } 683 } 684 } 685 686 return !bitmap_equal(prev_shadow_apm, matrix_mdev->shadow_apcb.apm, 687 AP_DEVICES) || 688 !bitmap_equal(prev_shadow_aqm, matrix_mdev->shadow_apcb.aqm, 689 AP_DOMAINS); 690 } 691 692 static int vfio_ap_mdev_init_dev(struct vfio_device *vdev) 693 { 694 struct ap_matrix_mdev *matrix_mdev = 695 container_of(vdev, struct ap_matrix_mdev, vdev); 696 697 matrix_mdev->mdev = to_mdev_device(vdev->dev); 698 vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix); 699 matrix_mdev->pqap_hook = handle_pqap; 700 vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb); 701 hash_init(matrix_mdev->qtable.queues); 702 703 return 0; 704 } 705 706 static int vfio_ap_mdev_probe(struct mdev_device *mdev) 707 { 708 struct ap_matrix_mdev *matrix_mdev; 709 int ret; 710 711 matrix_mdev = vfio_alloc_device(ap_matrix_mdev, vdev, &mdev->dev, 712 &vfio_ap_matrix_dev_ops); 713 if (IS_ERR(matrix_mdev)) 714 return PTR_ERR(matrix_mdev); 715 716 ret = vfio_register_emulated_iommu_dev(&matrix_mdev->vdev); 717 if (ret) 718 goto err_put_vdev; 719 matrix_mdev->req_trigger = NULL; 720 dev_set_drvdata(&mdev->dev, matrix_mdev); 721 mutex_lock(&matrix_dev->mdevs_lock); 722 list_add(&matrix_mdev->node, &matrix_dev->mdev_list); 723 mutex_unlock(&matrix_dev->mdevs_lock); 724 return 0; 725 726 err_put_vdev: 727 vfio_put_device(&matrix_mdev->vdev); 728 return ret; 729 } 730 731 static void vfio_ap_mdev_link_queue(struct ap_matrix_mdev *matrix_mdev, 732 struct vfio_ap_queue *q) 733 { 734 if (q) { 735 q->matrix_mdev = matrix_mdev; 736 hash_add(matrix_mdev->qtable.queues, &q->mdev_qnode, q->apqn); 737 } 738 } 739 740 static void vfio_ap_mdev_link_apqn(struct ap_matrix_mdev *matrix_mdev, int apqn) 741 { 742 struct vfio_ap_queue *q; 743 744 q = vfio_ap_find_queue(apqn); 745 vfio_ap_mdev_link_queue(matrix_mdev, q); 746 } 747 748 static void vfio_ap_unlink_queue_fr_mdev(struct vfio_ap_queue *q) 749 { 750 hash_del(&q->mdev_qnode); 751 } 752 753 static void vfio_ap_unlink_mdev_fr_queue(struct vfio_ap_queue *q) 754 { 755 q->matrix_mdev = NULL; 756 } 757 758 static void vfio_ap_mdev_unlink_fr_queues(struct ap_matrix_mdev *matrix_mdev) 759 { 760 struct vfio_ap_queue *q; 761 unsigned long apid, apqi; 762 763 for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) { 764 for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, 765 AP_DOMAINS) { 766 q = vfio_ap_mdev_get_queue(matrix_mdev, 767 AP_MKQID(apid, apqi)); 768 if (q) 769 q->matrix_mdev = NULL; 770 } 771 } 772 } 773 774 static void vfio_ap_mdev_remove(struct mdev_device *mdev) 775 { 776 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev); 777 778 vfio_unregister_group_dev(&matrix_mdev->vdev); 779 780 mutex_lock(&matrix_dev->guests_lock); 781 mutex_lock(&matrix_dev->mdevs_lock); 782 vfio_ap_mdev_reset_queues(&matrix_mdev->qtable); 783 vfio_ap_mdev_unlink_fr_queues(matrix_mdev); 784 list_del(&matrix_mdev->node); 785 mutex_unlock(&matrix_dev->mdevs_lock); 786 mutex_unlock(&matrix_dev->guests_lock); 787 vfio_put_device(&matrix_mdev->vdev); 788 } 789 790 #define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \ 791 "already assigned to %s" 792 793 static void vfio_ap_mdev_log_sharing_err(struct ap_matrix_mdev *matrix_mdev, 794 unsigned long *apm, 795 unsigned long *aqm) 796 { 797 unsigned long apid, apqi; 798 const struct device *dev = mdev_dev(matrix_mdev->mdev); 799 const char *mdev_name = dev_name(dev); 800 801 for_each_set_bit_inv(apid, apm, AP_DEVICES) 802 for_each_set_bit_inv(apqi, aqm, AP_DOMAINS) 803 dev_warn(dev, MDEV_SHARING_ERR, apid, apqi, mdev_name); 804 } 805 806 /** 807 * vfio_ap_mdev_verify_no_sharing - verify APQNs are not shared by matrix mdevs 808 * 809 * @mdev_apm: mask indicating the APIDs of the APQNs to be verified 810 * @mdev_aqm: mask indicating the APQIs of the APQNs to be verified 811 * 812 * Verifies that each APQN derived from the Cartesian product of a bitmap of 813 * AP adapter IDs and AP queue indexes is not configured for any matrix 814 * mediated device. AP queue sharing is not allowed. 815 * 816 * Return: 0 if the APQNs are not shared; otherwise return -EADDRINUSE. 817 */ 818 static int vfio_ap_mdev_verify_no_sharing(unsigned long *mdev_apm, 819 unsigned long *mdev_aqm) 820 { 821 struct ap_matrix_mdev *matrix_mdev; 822 DECLARE_BITMAP(apm, AP_DEVICES); 823 DECLARE_BITMAP(aqm, AP_DOMAINS); 824 825 list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { 826 /* 827 * If the input apm and aqm are fields of the matrix_mdev 828 * object, then move on to the next matrix_mdev. 829 */ 830 if (mdev_apm == matrix_mdev->matrix.apm && 831 mdev_aqm == matrix_mdev->matrix.aqm) 832 continue; 833 834 memset(apm, 0, sizeof(apm)); 835 memset(aqm, 0, sizeof(aqm)); 836 837 /* 838 * We work on full longs, as we can only exclude the leftover 839 * bits in non-inverse order. The leftover is all zeros. 840 */ 841 if (!bitmap_and(apm, mdev_apm, matrix_mdev->matrix.apm, 842 AP_DEVICES)) 843 continue; 844 845 if (!bitmap_and(aqm, mdev_aqm, matrix_mdev->matrix.aqm, 846 AP_DOMAINS)) 847 continue; 848 849 vfio_ap_mdev_log_sharing_err(matrix_mdev, apm, aqm); 850 851 return -EADDRINUSE; 852 } 853 854 return 0; 855 } 856 857 /** 858 * vfio_ap_mdev_validate_masks - verify that the APQNs assigned to the mdev are 859 * not reserved for the default zcrypt driver and 860 * are not assigned to another mdev. 861 * 862 * @matrix_mdev: the mdev to which the APQNs being validated are assigned. 863 * 864 * Return: One of the following values: 865 * o the error returned from the ap_apqn_in_matrix_owned_by_def_drv() function, 866 * most likely -EBUSY indicating the ap_perms_mutex lock is already held. 867 * o EADDRNOTAVAIL if an APQN assigned to @matrix_mdev is reserved for the 868 * zcrypt default driver. 869 * o EADDRINUSE if an APQN assigned to @matrix_mdev is assigned to another mdev 870 * o A zero indicating validation succeeded. 871 */ 872 static int vfio_ap_mdev_validate_masks(struct ap_matrix_mdev *matrix_mdev) 873 { 874 if (ap_apqn_in_matrix_owned_by_def_drv(matrix_mdev->matrix.apm, 875 matrix_mdev->matrix.aqm)) 876 return -EADDRNOTAVAIL; 877 878 return vfio_ap_mdev_verify_no_sharing(matrix_mdev->matrix.apm, 879 matrix_mdev->matrix.aqm); 880 } 881 882 static void vfio_ap_mdev_link_adapter(struct ap_matrix_mdev *matrix_mdev, 883 unsigned long apid) 884 { 885 unsigned long apqi; 886 887 for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS) 888 vfio_ap_mdev_link_apqn(matrix_mdev, 889 AP_MKQID(apid, apqi)); 890 } 891 892 /** 893 * assign_adapter_store - parses the APID from @buf and sets the 894 * corresponding bit in the mediated matrix device's APM 895 * 896 * @dev: the matrix device 897 * @attr: the mediated matrix device's assign_adapter attribute 898 * @buf: a buffer containing the AP adapter number (APID) to 899 * be assigned 900 * @count: the number of bytes in @buf 901 * 902 * Return: the number of bytes processed if the APID is valid; otherwise, 903 * returns one of the following errors: 904 * 905 * 1. -EINVAL 906 * The APID is not a valid number 907 * 908 * 2. -ENODEV 909 * The APID exceeds the maximum value configured for the system 910 * 911 * 3. -EADDRNOTAVAIL 912 * An APQN derived from the cross product of the APID being assigned 913 * and the APQIs previously assigned is not bound to the vfio_ap device 914 * driver; or, if no APQIs have yet been assigned, the APID is not 915 * contained in an APQN bound to the vfio_ap device driver. 916 * 917 * 4. -EADDRINUSE 918 * An APQN derived from the cross product of the APID being assigned 919 * and the APQIs previously assigned is being used by another mediated 920 * matrix device 921 * 922 * 5. -EAGAIN 923 * A lock required to validate the mdev's AP configuration could not 924 * be obtained. 925 */ 926 static ssize_t assign_adapter_store(struct device *dev, 927 struct device_attribute *attr, 928 const char *buf, size_t count) 929 { 930 int ret; 931 unsigned long apid; 932 DECLARE_BITMAP(apm_delta, AP_DEVICES); 933 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 934 935 mutex_lock(&ap_perms_mutex); 936 get_update_locks_for_mdev(matrix_mdev); 937 938 ret = kstrtoul(buf, 0, &apid); 939 if (ret) 940 goto done; 941 942 if (apid > matrix_mdev->matrix.apm_max) { 943 ret = -ENODEV; 944 goto done; 945 } 946 947 if (test_bit_inv(apid, matrix_mdev->matrix.apm)) { 948 ret = count; 949 goto done; 950 } 951 952 set_bit_inv(apid, matrix_mdev->matrix.apm); 953 954 ret = vfio_ap_mdev_validate_masks(matrix_mdev); 955 if (ret) { 956 clear_bit_inv(apid, matrix_mdev->matrix.apm); 957 goto done; 958 } 959 960 vfio_ap_mdev_link_adapter(matrix_mdev, apid); 961 memset(apm_delta, 0, sizeof(apm_delta)); 962 set_bit_inv(apid, apm_delta); 963 964 if (vfio_ap_mdev_filter_matrix(apm_delta, 965 matrix_mdev->matrix.aqm, matrix_mdev)) 966 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 967 968 ret = count; 969 done: 970 release_update_locks_for_mdev(matrix_mdev); 971 mutex_unlock(&ap_perms_mutex); 972 973 return ret; 974 } 975 static DEVICE_ATTR_WO(assign_adapter); 976 977 static struct vfio_ap_queue 978 *vfio_ap_unlink_apqn_fr_mdev(struct ap_matrix_mdev *matrix_mdev, 979 unsigned long apid, unsigned long apqi) 980 { 981 struct vfio_ap_queue *q = NULL; 982 983 q = vfio_ap_mdev_get_queue(matrix_mdev, AP_MKQID(apid, apqi)); 984 /* If the queue is assigned to the matrix mdev, unlink it. */ 985 if (q) 986 vfio_ap_unlink_queue_fr_mdev(q); 987 988 return q; 989 } 990 991 /** 992 * vfio_ap_mdev_unlink_adapter - unlink all queues associated with unassigned 993 * adapter from the matrix mdev to which the 994 * adapter was assigned. 995 * @matrix_mdev: the matrix mediated device to which the adapter was assigned. 996 * @apid: the APID of the unassigned adapter. 997 * @qtable: table for storing queues associated with unassigned adapter. 998 */ 999 static void vfio_ap_mdev_unlink_adapter(struct ap_matrix_mdev *matrix_mdev, 1000 unsigned long apid, 1001 struct ap_queue_table *qtable) 1002 { 1003 unsigned long apqi; 1004 struct vfio_ap_queue *q; 1005 1006 for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS) { 1007 q = vfio_ap_unlink_apqn_fr_mdev(matrix_mdev, apid, apqi); 1008 1009 if (q && qtable) { 1010 if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) && 1011 test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) 1012 hash_add(qtable->queues, &q->mdev_qnode, 1013 q->apqn); 1014 } 1015 } 1016 } 1017 1018 static void vfio_ap_mdev_hot_unplug_adapter(struct ap_matrix_mdev *matrix_mdev, 1019 unsigned long apid) 1020 { 1021 int loop_cursor; 1022 struct vfio_ap_queue *q; 1023 struct ap_queue_table *qtable = kzalloc(sizeof(*qtable), GFP_KERNEL); 1024 1025 hash_init(qtable->queues); 1026 vfio_ap_mdev_unlink_adapter(matrix_mdev, apid, qtable); 1027 1028 if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm)) { 1029 clear_bit_inv(apid, matrix_mdev->shadow_apcb.apm); 1030 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 1031 } 1032 1033 vfio_ap_mdev_reset_queues(qtable); 1034 1035 hash_for_each(qtable->queues, loop_cursor, q, mdev_qnode) { 1036 vfio_ap_unlink_mdev_fr_queue(q); 1037 hash_del(&q->mdev_qnode); 1038 } 1039 1040 kfree(qtable); 1041 } 1042 1043 /** 1044 * unassign_adapter_store - parses the APID from @buf and clears the 1045 * corresponding bit in the mediated matrix device's APM 1046 * 1047 * @dev: the matrix device 1048 * @attr: the mediated matrix device's unassign_adapter attribute 1049 * @buf: a buffer containing the adapter number (APID) to be unassigned 1050 * @count: the number of bytes in @buf 1051 * 1052 * Return: the number of bytes processed if the APID is valid; otherwise, 1053 * returns one of the following errors: 1054 * -EINVAL if the APID is not a number 1055 * -ENODEV if the APID it exceeds the maximum value configured for the 1056 * system 1057 */ 1058 static ssize_t unassign_adapter_store(struct device *dev, 1059 struct device_attribute *attr, 1060 const char *buf, size_t count) 1061 { 1062 int ret; 1063 unsigned long apid; 1064 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1065 1066 get_update_locks_for_mdev(matrix_mdev); 1067 1068 ret = kstrtoul(buf, 0, &apid); 1069 if (ret) 1070 goto done; 1071 1072 if (apid > matrix_mdev->matrix.apm_max) { 1073 ret = -ENODEV; 1074 goto done; 1075 } 1076 1077 if (!test_bit_inv(apid, matrix_mdev->matrix.apm)) { 1078 ret = count; 1079 goto done; 1080 } 1081 1082 clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm); 1083 vfio_ap_mdev_hot_unplug_adapter(matrix_mdev, apid); 1084 ret = count; 1085 done: 1086 release_update_locks_for_mdev(matrix_mdev); 1087 return ret; 1088 } 1089 static DEVICE_ATTR_WO(unassign_adapter); 1090 1091 static void vfio_ap_mdev_link_domain(struct ap_matrix_mdev *matrix_mdev, 1092 unsigned long apqi) 1093 { 1094 unsigned long apid; 1095 1096 for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) 1097 vfio_ap_mdev_link_apqn(matrix_mdev, 1098 AP_MKQID(apid, apqi)); 1099 } 1100 1101 /** 1102 * assign_domain_store - parses the APQI from @buf and sets the 1103 * corresponding bit in the mediated matrix device's AQM 1104 * 1105 * @dev: the matrix device 1106 * @attr: the mediated matrix device's assign_domain attribute 1107 * @buf: a buffer containing the AP queue index (APQI) of the domain to 1108 * be assigned 1109 * @count: the number of bytes in @buf 1110 * 1111 * Return: the number of bytes processed if the APQI is valid; otherwise returns 1112 * one of the following errors: 1113 * 1114 * 1. -EINVAL 1115 * The APQI is not a valid number 1116 * 1117 * 2. -ENODEV 1118 * The APQI exceeds the maximum value configured for the system 1119 * 1120 * 3. -EADDRNOTAVAIL 1121 * An APQN derived from the cross product of the APQI being assigned 1122 * and the APIDs previously assigned is not bound to the vfio_ap device 1123 * driver; or, if no APIDs have yet been assigned, the APQI is not 1124 * contained in an APQN bound to the vfio_ap device driver. 1125 * 1126 * 4. -EADDRINUSE 1127 * An APQN derived from the cross product of the APQI being assigned 1128 * and the APIDs previously assigned is being used by another mediated 1129 * matrix device 1130 * 1131 * 5. -EAGAIN 1132 * The lock required to validate the mdev's AP configuration could not 1133 * be obtained. 1134 */ 1135 static ssize_t assign_domain_store(struct device *dev, 1136 struct device_attribute *attr, 1137 const char *buf, size_t count) 1138 { 1139 int ret; 1140 unsigned long apqi; 1141 DECLARE_BITMAP(aqm_delta, AP_DOMAINS); 1142 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1143 1144 mutex_lock(&ap_perms_mutex); 1145 get_update_locks_for_mdev(matrix_mdev); 1146 1147 ret = kstrtoul(buf, 0, &apqi); 1148 if (ret) 1149 goto done; 1150 1151 if (apqi > matrix_mdev->matrix.aqm_max) { 1152 ret = -ENODEV; 1153 goto done; 1154 } 1155 1156 if (test_bit_inv(apqi, matrix_mdev->matrix.aqm)) { 1157 ret = count; 1158 goto done; 1159 } 1160 1161 set_bit_inv(apqi, matrix_mdev->matrix.aqm); 1162 1163 ret = vfio_ap_mdev_validate_masks(matrix_mdev); 1164 if (ret) { 1165 clear_bit_inv(apqi, matrix_mdev->matrix.aqm); 1166 goto done; 1167 } 1168 1169 vfio_ap_mdev_link_domain(matrix_mdev, apqi); 1170 memset(aqm_delta, 0, sizeof(aqm_delta)); 1171 set_bit_inv(apqi, aqm_delta); 1172 1173 if (vfio_ap_mdev_filter_matrix(matrix_mdev->matrix.apm, aqm_delta, 1174 matrix_mdev)) 1175 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 1176 1177 ret = count; 1178 done: 1179 release_update_locks_for_mdev(matrix_mdev); 1180 mutex_unlock(&ap_perms_mutex); 1181 1182 return ret; 1183 } 1184 static DEVICE_ATTR_WO(assign_domain); 1185 1186 static void vfio_ap_mdev_unlink_domain(struct ap_matrix_mdev *matrix_mdev, 1187 unsigned long apqi, 1188 struct ap_queue_table *qtable) 1189 { 1190 unsigned long apid; 1191 struct vfio_ap_queue *q; 1192 1193 for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) { 1194 q = vfio_ap_unlink_apqn_fr_mdev(matrix_mdev, apid, apqi); 1195 1196 if (q && qtable) { 1197 if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) && 1198 test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) 1199 hash_add(qtable->queues, &q->mdev_qnode, 1200 q->apqn); 1201 } 1202 } 1203 } 1204 1205 static void vfio_ap_mdev_hot_unplug_domain(struct ap_matrix_mdev *matrix_mdev, 1206 unsigned long apqi) 1207 { 1208 int loop_cursor; 1209 struct vfio_ap_queue *q; 1210 struct ap_queue_table *qtable = kzalloc(sizeof(*qtable), GFP_KERNEL); 1211 1212 hash_init(qtable->queues); 1213 vfio_ap_mdev_unlink_domain(matrix_mdev, apqi, qtable); 1214 1215 if (test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) { 1216 clear_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm); 1217 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 1218 } 1219 1220 vfio_ap_mdev_reset_queues(qtable); 1221 1222 hash_for_each(qtable->queues, loop_cursor, q, mdev_qnode) { 1223 vfio_ap_unlink_mdev_fr_queue(q); 1224 hash_del(&q->mdev_qnode); 1225 } 1226 1227 kfree(qtable); 1228 } 1229 1230 /** 1231 * unassign_domain_store - parses the APQI from @buf and clears the 1232 * corresponding bit in the mediated matrix device's AQM 1233 * 1234 * @dev: the matrix device 1235 * @attr: the mediated matrix device's unassign_domain attribute 1236 * @buf: a buffer containing the AP queue index (APQI) of the domain to 1237 * be unassigned 1238 * @count: the number of bytes in @buf 1239 * 1240 * Return: the number of bytes processed if the APQI is valid; otherwise, 1241 * returns one of the following errors: 1242 * -EINVAL if the APQI is not a number 1243 * -ENODEV if the APQI exceeds the maximum value configured for the system 1244 */ 1245 static ssize_t unassign_domain_store(struct device *dev, 1246 struct device_attribute *attr, 1247 const char *buf, size_t count) 1248 { 1249 int ret; 1250 unsigned long apqi; 1251 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1252 1253 get_update_locks_for_mdev(matrix_mdev); 1254 1255 ret = kstrtoul(buf, 0, &apqi); 1256 if (ret) 1257 goto done; 1258 1259 if (apqi > matrix_mdev->matrix.aqm_max) { 1260 ret = -ENODEV; 1261 goto done; 1262 } 1263 1264 if (!test_bit_inv(apqi, matrix_mdev->matrix.aqm)) { 1265 ret = count; 1266 goto done; 1267 } 1268 1269 clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm); 1270 vfio_ap_mdev_hot_unplug_domain(matrix_mdev, apqi); 1271 ret = count; 1272 1273 done: 1274 release_update_locks_for_mdev(matrix_mdev); 1275 return ret; 1276 } 1277 static DEVICE_ATTR_WO(unassign_domain); 1278 1279 /** 1280 * assign_control_domain_store - parses the domain ID from @buf and sets 1281 * the corresponding bit in the mediated matrix device's ADM 1282 * 1283 * @dev: the matrix device 1284 * @attr: the mediated matrix device's assign_control_domain attribute 1285 * @buf: a buffer containing the domain ID to be assigned 1286 * @count: the number of bytes in @buf 1287 * 1288 * Return: the number of bytes processed if the domain ID is valid; otherwise, 1289 * returns one of the following errors: 1290 * -EINVAL if the ID is not a number 1291 * -ENODEV if the ID exceeds the maximum value configured for the system 1292 */ 1293 static ssize_t assign_control_domain_store(struct device *dev, 1294 struct device_attribute *attr, 1295 const char *buf, size_t count) 1296 { 1297 int ret; 1298 unsigned long id; 1299 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1300 1301 get_update_locks_for_mdev(matrix_mdev); 1302 1303 ret = kstrtoul(buf, 0, &id); 1304 if (ret) 1305 goto done; 1306 1307 if (id > matrix_mdev->matrix.adm_max) { 1308 ret = -ENODEV; 1309 goto done; 1310 } 1311 1312 if (test_bit_inv(id, matrix_mdev->matrix.adm)) { 1313 ret = count; 1314 goto done; 1315 } 1316 1317 /* Set the bit in the ADM (bitmask) corresponding to the AP control 1318 * domain number (id). The bits in the mask, from most significant to 1319 * least significant, correspond to IDs 0 up to the one less than the 1320 * number of control domains that can be assigned. 1321 */ 1322 set_bit_inv(id, matrix_mdev->matrix.adm); 1323 if (vfio_ap_mdev_filter_cdoms(matrix_mdev)) 1324 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 1325 1326 ret = count; 1327 done: 1328 release_update_locks_for_mdev(matrix_mdev); 1329 return ret; 1330 } 1331 static DEVICE_ATTR_WO(assign_control_domain); 1332 1333 /** 1334 * unassign_control_domain_store - parses the domain ID from @buf and 1335 * clears the corresponding bit in the mediated matrix device's ADM 1336 * 1337 * @dev: the matrix device 1338 * @attr: the mediated matrix device's unassign_control_domain attribute 1339 * @buf: a buffer containing the domain ID to be unassigned 1340 * @count: the number of bytes in @buf 1341 * 1342 * Return: the number of bytes processed if the domain ID is valid; otherwise, 1343 * returns one of the following errors: 1344 * -EINVAL if the ID is not a number 1345 * -ENODEV if the ID exceeds the maximum value configured for the system 1346 */ 1347 static ssize_t unassign_control_domain_store(struct device *dev, 1348 struct device_attribute *attr, 1349 const char *buf, size_t count) 1350 { 1351 int ret; 1352 unsigned long domid; 1353 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1354 1355 get_update_locks_for_mdev(matrix_mdev); 1356 1357 ret = kstrtoul(buf, 0, &domid); 1358 if (ret) 1359 goto done; 1360 1361 if (domid > matrix_mdev->matrix.adm_max) { 1362 ret = -ENODEV; 1363 goto done; 1364 } 1365 1366 if (!test_bit_inv(domid, matrix_mdev->matrix.adm)) { 1367 ret = count; 1368 goto done; 1369 } 1370 1371 clear_bit_inv(domid, matrix_mdev->matrix.adm); 1372 1373 if (test_bit_inv(domid, matrix_mdev->shadow_apcb.adm)) { 1374 clear_bit_inv(domid, matrix_mdev->shadow_apcb.adm); 1375 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 1376 } 1377 1378 ret = count; 1379 done: 1380 release_update_locks_for_mdev(matrix_mdev); 1381 return ret; 1382 } 1383 static DEVICE_ATTR_WO(unassign_control_domain); 1384 1385 static ssize_t control_domains_show(struct device *dev, 1386 struct device_attribute *dev_attr, 1387 char *buf) 1388 { 1389 unsigned long id; 1390 int nchars = 0; 1391 int n; 1392 char *bufpos = buf; 1393 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1394 unsigned long max_domid = matrix_mdev->matrix.adm_max; 1395 1396 mutex_lock(&matrix_dev->mdevs_lock); 1397 for_each_set_bit_inv(id, matrix_mdev->matrix.adm, max_domid + 1) { 1398 n = sprintf(bufpos, "%04lx\n", id); 1399 bufpos += n; 1400 nchars += n; 1401 } 1402 mutex_unlock(&matrix_dev->mdevs_lock); 1403 1404 return nchars; 1405 } 1406 static DEVICE_ATTR_RO(control_domains); 1407 1408 static ssize_t vfio_ap_mdev_matrix_show(struct ap_matrix *matrix, char *buf) 1409 { 1410 char *bufpos = buf; 1411 unsigned long apid; 1412 unsigned long apqi; 1413 unsigned long apid1; 1414 unsigned long apqi1; 1415 unsigned long napm_bits = matrix->apm_max + 1; 1416 unsigned long naqm_bits = matrix->aqm_max + 1; 1417 int nchars = 0; 1418 int n; 1419 1420 apid1 = find_first_bit_inv(matrix->apm, napm_bits); 1421 apqi1 = find_first_bit_inv(matrix->aqm, naqm_bits); 1422 1423 if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) { 1424 for_each_set_bit_inv(apid, matrix->apm, napm_bits) { 1425 for_each_set_bit_inv(apqi, matrix->aqm, 1426 naqm_bits) { 1427 n = sprintf(bufpos, "%02lx.%04lx\n", apid, 1428 apqi); 1429 bufpos += n; 1430 nchars += n; 1431 } 1432 } 1433 } else if (apid1 < napm_bits) { 1434 for_each_set_bit_inv(apid, matrix->apm, napm_bits) { 1435 n = sprintf(bufpos, "%02lx.\n", apid); 1436 bufpos += n; 1437 nchars += n; 1438 } 1439 } else if (apqi1 < naqm_bits) { 1440 for_each_set_bit_inv(apqi, matrix->aqm, naqm_bits) { 1441 n = sprintf(bufpos, ".%04lx\n", apqi); 1442 bufpos += n; 1443 nchars += n; 1444 } 1445 } 1446 1447 return nchars; 1448 } 1449 1450 static ssize_t matrix_show(struct device *dev, struct device_attribute *attr, 1451 char *buf) 1452 { 1453 ssize_t nchars; 1454 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1455 1456 mutex_lock(&matrix_dev->mdevs_lock); 1457 nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->matrix, buf); 1458 mutex_unlock(&matrix_dev->mdevs_lock); 1459 1460 return nchars; 1461 } 1462 static DEVICE_ATTR_RO(matrix); 1463 1464 static ssize_t guest_matrix_show(struct device *dev, 1465 struct device_attribute *attr, char *buf) 1466 { 1467 ssize_t nchars; 1468 struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev); 1469 1470 mutex_lock(&matrix_dev->mdevs_lock); 1471 nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->shadow_apcb, buf); 1472 mutex_unlock(&matrix_dev->mdevs_lock); 1473 1474 return nchars; 1475 } 1476 static DEVICE_ATTR_RO(guest_matrix); 1477 1478 static struct attribute *vfio_ap_mdev_attrs[] = { 1479 &dev_attr_assign_adapter.attr, 1480 &dev_attr_unassign_adapter.attr, 1481 &dev_attr_assign_domain.attr, 1482 &dev_attr_unassign_domain.attr, 1483 &dev_attr_assign_control_domain.attr, 1484 &dev_attr_unassign_control_domain.attr, 1485 &dev_attr_control_domains.attr, 1486 &dev_attr_matrix.attr, 1487 &dev_attr_guest_matrix.attr, 1488 NULL, 1489 }; 1490 1491 static struct attribute_group vfio_ap_mdev_attr_group = { 1492 .attrs = vfio_ap_mdev_attrs 1493 }; 1494 1495 static const struct attribute_group *vfio_ap_mdev_attr_groups[] = { 1496 &vfio_ap_mdev_attr_group, 1497 NULL 1498 }; 1499 1500 /** 1501 * vfio_ap_mdev_set_kvm - sets all data for @matrix_mdev that are needed 1502 * to manage AP resources for the guest whose state is represented by @kvm 1503 * 1504 * @matrix_mdev: a mediated matrix device 1505 * @kvm: reference to KVM instance 1506 * 1507 * Return: 0 if no other mediated matrix device has a reference to @kvm; 1508 * otherwise, returns an -EPERM. 1509 */ 1510 static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev, 1511 struct kvm *kvm) 1512 { 1513 struct ap_matrix_mdev *m; 1514 1515 if (kvm->arch.crypto.crycbd) { 1516 down_write(&kvm->arch.crypto.pqap_hook_rwsem); 1517 kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook; 1518 up_write(&kvm->arch.crypto.pqap_hook_rwsem); 1519 1520 get_update_locks_for_kvm(kvm); 1521 1522 list_for_each_entry(m, &matrix_dev->mdev_list, node) { 1523 if (m != matrix_mdev && m->kvm == kvm) { 1524 release_update_locks_for_kvm(kvm); 1525 return -EPERM; 1526 } 1527 } 1528 1529 kvm_get_kvm(kvm); 1530 matrix_mdev->kvm = kvm; 1531 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 1532 1533 release_update_locks_for_kvm(kvm); 1534 } 1535 1536 return 0; 1537 } 1538 1539 static void unmap_iova(struct ap_matrix_mdev *matrix_mdev, u64 iova, u64 length) 1540 { 1541 struct ap_queue_table *qtable = &matrix_mdev->qtable; 1542 struct vfio_ap_queue *q; 1543 int loop_cursor; 1544 1545 hash_for_each(qtable->queues, loop_cursor, q, mdev_qnode) { 1546 if (q->saved_iova >= iova && q->saved_iova < iova + length) 1547 vfio_ap_irq_disable(q); 1548 } 1549 } 1550 1551 static void vfio_ap_mdev_dma_unmap(struct vfio_device *vdev, u64 iova, 1552 u64 length) 1553 { 1554 struct ap_matrix_mdev *matrix_mdev = 1555 container_of(vdev, struct ap_matrix_mdev, vdev); 1556 1557 mutex_lock(&matrix_dev->mdevs_lock); 1558 1559 unmap_iova(matrix_mdev, iova, length); 1560 1561 mutex_unlock(&matrix_dev->mdevs_lock); 1562 } 1563 1564 /** 1565 * vfio_ap_mdev_unset_kvm - performs clean-up of resources no longer needed 1566 * by @matrix_mdev. 1567 * 1568 * @matrix_mdev: a matrix mediated device 1569 */ 1570 static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev) 1571 { 1572 struct kvm *kvm = matrix_mdev->kvm; 1573 1574 if (kvm && kvm->arch.crypto.crycbd) { 1575 down_write(&kvm->arch.crypto.pqap_hook_rwsem); 1576 kvm->arch.crypto.pqap_hook = NULL; 1577 up_write(&kvm->arch.crypto.pqap_hook_rwsem); 1578 1579 get_update_locks_for_kvm(kvm); 1580 1581 kvm_arch_crypto_clear_masks(kvm); 1582 vfio_ap_mdev_reset_queues(&matrix_mdev->qtable); 1583 kvm_put_kvm(kvm); 1584 matrix_mdev->kvm = NULL; 1585 1586 release_update_locks_for_kvm(kvm); 1587 } 1588 } 1589 1590 static struct vfio_ap_queue *vfio_ap_find_queue(int apqn) 1591 { 1592 struct ap_queue *queue; 1593 struct vfio_ap_queue *q = NULL; 1594 1595 queue = ap_get_qdev(apqn); 1596 if (!queue) 1597 return NULL; 1598 1599 if (queue->ap_dev.device.driver == &matrix_dev->vfio_ap_drv->driver) 1600 q = dev_get_drvdata(&queue->ap_dev.device); 1601 1602 put_device(&queue->ap_dev.device); 1603 1604 return q; 1605 } 1606 1607 static int apq_status_check(int apqn, struct ap_queue_status *status) 1608 { 1609 switch (status->response_code) { 1610 case AP_RESPONSE_NORMAL: 1611 case AP_RESPONSE_DECONFIGURED: 1612 return 0; 1613 case AP_RESPONSE_RESET_IN_PROGRESS: 1614 case AP_RESPONSE_BUSY: 1615 return -EBUSY; 1616 default: 1617 WARN(true, 1618 "failed to verify reset of queue %02x.%04x: TAPQ rc=%u\n", 1619 AP_QID_CARD(apqn), AP_QID_QUEUE(apqn), 1620 status->response_code); 1621 return -EIO; 1622 } 1623 } 1624 1625 static int apq_reset_check(struct vfio_ap_queue *q) 1626 { 1627 int ret; 1628 int iters = MAX_RESET_CHECK_WAIT / AP_RESET_INTERVAL; 1629 struct ap_queue_status status; 1630 1631 for (; iters > 0; iters--) { 1632 msleep(AP_RESET_INTERVAL); 1633 status = ap_tapq(q->apqn, NULL); 1634 ret = apq_status_check(q->apqn, &status); 1635 if (ret != -EBUSY) 1636 return ret; 1637 } 1638 WARN_ONCE(iters <= 0, 1639 "timeout verifying reset of queue %02x.%04x (%u, %u, %u)", 1640 AP_QID_CARD(q->apqn), AP_QID_QUEUE(q->apqn), 1641 status.queue_empty, status.irq_enabled, status.response_code); 1642 return ret; 1643 } 1644 1645 static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q) 1646 { 1647 struct ap_queue_status status; 1648 int ret; 1649 1650 if (!q) 1651 return 0; 1652 retry_zapq: 1653 status = ap_zapq(q->apqn, 0); 1654 q->reset_rc = status.response_code; 1655 switch (status.response_code) { 1656 case AP_RESPONSE_NORMAL: 1657 ret = 0; 1658 if (!status.irq_enabled) 1659 vfio_ap_free_aqic_resources(q); 1660 if (!status.queue_empty || status.irq_enabled) { 1661 ret = apq_reset_check(q); 1662 if (status.irq_enabled && ret == 0) 1663 vfio_ap_free_aqic_resources(q); 1664 } 1665 break; 1666 case AP_RESPONSE_RESET_IN_PROGRESS: 1667 case AP_RESPONSE_BUSY: 1668 /* 1669 * There is a reset issued by another process in progress. Let's wait 1670 * for that to complete. Since we have no idea whether it was a RAPQ or 1671 * ZAPQ, then if it completes successfully, let's issue the ZAPQ. 1672 */ 1673 ret = apq_reset_check(q); 1674 if (ret) 1675 break; 1676 goto retry_zapq; 1677 case AP_RESPONSE_DECONFIGURED: 1678 /* 1679 * When an AP adapter is deconfigured, the associated 1680 * queues are reset, so let's return a value indicating the reset 1681 * completed successfully. 1682 */ 1683 ret = 0; 1684 vfio_ap_free_aqic_resources(q); 1685 break; 1686 default: 1687 WARN(true, 1688 "PQAP/ZAPQ for %02x.%04x failed with invalid rc=%u\n", 1689 AP_QID_CARD(q->apqn), AP_QID_QUEUE(q->apqn), 1690 status.response_code); 1691 return -EIO; 1692 } 1693 1694 return ret; 1695 } 1696 1697 static int vfio_ap_mdev_reset_queues(struct ap_queue_table *qtable) 1698 { 1699 int ret, loop_cursor, rc = 0; 1700 struct vfio_ap_queue *q; 1701 1702 hash_for_each(qtable->queues, loop_cursor, q, mdev_qnode) { 1703 ret = vfio_ap_mdev_reset_queue(q); 1704 /* 1705 * Regardless whether a queue turns out to be busy, or 1706 * is not operational, we need to continue resetting 1707 * the remaining queues. 1708 */ 1709 if (ret) 1710 rc = ret; 1711 } 1712 1713 return rc; 1714 } 1715 1716 static int vfio_ap_mdev_open_device(struct vfio_device *vdev) 1717 { 1718 struct ap_matrix_mdev *matrix_mdev = 1719 container_of(vdev, struct ap_matrix_mdev, vdev); 1720 1721 if (!vdev->kvm) 1722 return -EINVAL; 1723 1724 return vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm); 1725 } 1726 1727 static void vfio_ap_mdev_close_device(struct vfio_device *vdev) 1728 { 1729 struct ap_matrix_mdev *matrix_mdev = 1730 container_of(vdev, struct ap_matrix_mdev, vdev); 1731 1732 vfio_ap_mdev_unset_kvm(matrix_mdev); 1733 } 1734 1735 static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count) 1736 { 1737 struct device *dev = vdev->dev; 1738 struct ap_matrix_mdev *matrix_mdev; 1739 1740 matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev); 1741 1742 if (matrix_mdev->req_trigger) { 1743 if (!(count % 10)) 1744 dev_notice_ratelimited(dev, 1745 "Relaying device request to user (#%u)\n", 1746 count); 1747 1748 eventfd_signal(matrix_mdev->req_trigger, 1); 1749 } else if (count == 0) { 1750 dev_notice(dev, 1751 "No device request registered, blocked until released by user\n"); 1752 } 1753 } 1754 1755 static int vfio_ap_mdev_get_device_info(unsigned long arg) 1756 { 1757 unsigned long minsz; 1758 struct vfio_device_info info; 1759 1760 minsz = offsetofend(struct vfio_device_info, num_irqs); 1761 1762 if (copy_from_user(&info, (void __user *)arg, minsz)) 1763 return -EFAULT; 1764 1765 if (info.argsz < minsz) 1766 return -EINVAL; 1767 1768 info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET; 1769 info.num_regions = 0; 1770 info.num_irqs = VFIO_AP_NUM_IRQS; 1771 1772 return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; 1773 } 1774 1775 static ssize_t vfio_ap_get_irq_info(unsigned long arg) 1776 { 1777 unsigned long minsz; 1778 struct vfio_irq_info info; 1779 1780 minsz = offsetofend(struct vfio_irq_info, count); 1781 1782 if (copy_from_user(&info, (void __user *)arg, minsz)) 1783 return -EFAULT; 1784 1785 if (info.argsz < minsz || info.index >= VFIO_AP_NUM_IRQS) 1786 return -EINVAL; 1787 1788 switch (info.index) { 1789 case VFIO_AP_REQ_IRQ_INDEX: 1790 info.count = 1; 1791 info.flags = VFIO_IRQ_INFO_EVENTFD; 1792 break; 1793 default: 1794 return -EINVAL; 1795 } 1796 1797 return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; 1798 } 1799 1800 static int vfio_ap_irq_set_init(struct vfio_irq_set *irq_set, unsigned long arg) 1801 { 1802 int ret; 1803 size_t data_size; 1804 unsigned long minsz; 1805 1806 minsz = offsetofend(struct vfio_irq_set, count); 1807 1808 if (copy_from_user(irq_set, (void __user *)arg, minsz)) 1809 return -EFAULT; 1810 1811 ret = vfio_set_irqs_validate_and_prepare(irq_set, 1, VFIO_AP_NUM_IRQS, 1812 &data_size); 1813 if (ret) 1814 return ret; 1815 1816 if (!(irq_set->flags & VFIO_IRQ_SET_ACTION_TRIGGER)) 1817 return -EINVAL; 1818 1819 return 0; 1820 } 1821 1822 static int vfio_ap_set_request_irq(struct ap_matrix_mdev *matrix_mdev, 1823 unsigned long arg) 1824 { 1825 s32 fd; 1826 void __user *data; 1827 unsigned long minsz; 1828 struct eventfd_ctx *req_trigger; 1829 1830 minsz = offsetofend(struct vfio_irq_set, count); 1831 data = (void __user *)(arg + minsz); 1832 1833 if (get_user(fd, (s32 __user *)data)) 1834 return -EFAULT; 1835 1836 if (fd == -1) { 1837 if (matrix_mdev->req_trigger) 1838 eventfd_ctx_put(matrix_mdev->req_trigger); 1839 matrix_mdev->req_trigger = NULL; 1840 } else if (fd >= 0) { 1841 req_trigger = eventfd_ctx_fdget(fd); 1842 if (IS_ERR(req_trigger)) 1843 return PTR_ERR(req_trigger); 1844 1845 if (matrix_mdev->req_trigger) 1846 eventfd_ctx_put(matrix_mdev->req_trigger); 1847 1848 matrix_mdev->req_trigger = req_trigger; 1849 } else { 1850 return -EINVAL; 1851 } 1852 1853 return 0; 1854 } 1855 1856 static int vfio_ap_set_irqs(struct ap_matrix_mdev *matrix_mdev, 1857 unsigned long arg) 1858 { 1859 int ret; 1860 struct vfio_irq_set irq_set; 1861 1862 ret = vfio_ap_irq_set_init(&irq_set, arg); 1863 if (ret) 1864 return ret; 1865 1866 switch (irq_set.flags & VFIO_IRQ_SET_DATA_TYPE_MASK) { 1867 case VFIO_IRQ_SET_DATA_EVENTFD: 1868 switch (irq_set.index) { 1869 case VFIO_AP_REQ_IRQ_INDEX: 1870 return vfio_ap_set_request_irq(matrix_mdev, arg); 1871 default: 1872 return -EINVAL; 1873 } 1874 default: 1875 return -EINVAL; 1876 } 1877 } 1878 1879 static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev, 1880 unsigned int cmd, unsigned long arg) 1881 { 1882 struct ap_matrix_mdev *matrix_mdev = 1883 container_of(vdev, struct ap_matrix_mdev, vdev); 1884 int ret; 1885 1886 mutex_lock(&matrix_dev->mdevs_lock); 1887 switch (cmd) { 1888 case VFIO_DEVICE_GET_INFO: 1889 ret = vfio_ap_mdev_get_device_info(arg); 1890 break; 1891 case VFIO_DEVICE_RESET: 1892 ret = vfio_ap_mdev_reset_queues(&matrix_mdev->qtable); 1893 break; 1894 case VFIO_DEVICE_GET_IRQ_INFO: 1895 ret = vfio_ap_get_irq_info(arg); 1896 break; 1897 case VFIO_DEVICE_SET_IRQS: 1898 ret = vfio_ap_set_irqs(matrix_mdev, arg); 1899 break; 1900 default: 1901 ret = -EOPNOTSUPP; 1902 break; 1903 } 1904 mutex_unlock(&matrix_dev->mdevs_lock); 1905 1906 return ret; 1907 } 1908 1909 static struct ap_matrix_mdev *vfio_ap_mdev_for_queue(struct vfio_ap_queue *q) 1910 { 1911 struct ap_matrix_mdev *matrix_mdev; 1912 unsigned long apid = AP_QID_CARD(q->apqn); 1913 unsigned long apqi = AP_QID_QUEUE(q->apqn); 1914 1915 list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { 1916 if (test_bit_inv(apid, matrix_mdev->matrix.apm) && 1917 test_bit_inv(apqi, matrix_mdev->matrix.aqm)) 1918 return matrix_mdev; 1919 } 1920 1921 return NULL; 1922 } 1923 1924 static ssize_t status_show(struct device *dev, 1925 struct device_attribute *attr, 1926 char *buf) 1927 { 1928 ssize_t nchars = 0; 1929 struct vfio_ap_queue *q; 1930 struct ap_matrix_mdev *matrix_mdev; 1931 struct ap_device *apdev = to_ap_dev(dev); 1932 1933 mutex_lock(&matrix_dev->mdevs_lock); 1934 q = dev_get_drvdata(&apdev->device); 1935 matrix_mdev = vfio_ap_mdev_for_queue(q); 1936 1937 if (matrix_mdev) { 1938 if (matrix_mdev->kvm) 1939 nchars = scnprintf(buf, PAGE_SIZE, "%s\n", 1940 AP_QUEUE_IN_USE); 1941 else 1942 nchars = scnprintf(buf, PAGE_SIZE, "%s\n", 1943 AP_QUEUE_ASSIGNED); 1944 } else { 1945 nchars = scnprintf(buf, PAGE_SIZE, "%s\n", 1946 AP_QUEUE_UNASSIGNED); 1947 } 1948 1949 mutex_unlock(&matrix_dev->mdevs_lock); 1950 1951 return nchars; 1952 } 1953 1954 static DEVICE_ATTR_RO(status); 1955 1956 static struct attribute *vfio_queue_attrs[] = { 1957 &dev_attr_status.attr, 1958 NULL, 1959 }; 1960 1961 static const struct attribute_group vfio_queue_attr_group = { 1962 .attrs = vfio_queue_attrs, 1963 }; 1964 1965 static const struct vfio_device_ops vfio_ap_matrix_dev_ops = { 1966 .init = vfio_ap_mdev_init_dev, 1967 .open_device = vfio_ap_mdev_open_device, 1968 .close_device = vfio_ap_mdev_close_device, 1969 .ioctl = vfio_ap_mdev_ioctl, 1970 .dma_unmap = vfio_ap_mdev_dma_unmap, 1971 .bind_iommufd = vfio_iommufd_emulated_bind, 1972 .unbind_iommufd = vfio_iommufd_emulated_unbind, 1973 .attach_ioas = vfio_iommufd_emulated_attach_ioas, 1974 .request = vfio_ap_mdev_request 1975 }; 1976 1977 static struct mdev_driver vfio_ap_matrix_driver = { 1978 .device_api = VFIO_DEVICE_API_AP_STRING, 1979 .max_instances = MAX_ZDEV_ENTRIES_EXT, 1980 .driver = { 1981 .name = "vfio_ap_mdev", 1982 .owner = THIS_MODULE, 1983 .mod_name = KBUILD_MODNAME, 1984 .dev_groups = vfio_ap_mdev_attr_groups, 1985 }, 1986 .probe = vfio_ap_mdev_probe, 1987 .remove = vfio_ap_mdev_remove, 1988 }; 1989 1990 int vfio_ap_mdev_register(void) 1991 { 1992 int ret; 1993 1994 ret = mdev_register_driver(&vfio_ap_matrix_driver); 1995 if (ret) 1996 return ret; 1997 1998 matrix_dev->mdev_type.sysfs_name = VFIO_AP_MDEV_TYPE_HWVIRT; 1999 matrix_dev->mdev_type.pretty_name = VFIO_AP_MDEV_NAME_HWVIRT; 2000 matrix_dev->mdev_types[0] = &matrix_dev->mdev_type; 2001 ret = mdev_register_parent(&matrix_dev->parent, &matrix_dev->device, 2002 &vfio_ap_matrix_driver, 2003 matrix_dev->mdev_types, 1); 2004 if (ret) 2005 goto err_driver; 2006 return 0; 2007 2008 err_driver: 2009 mdev_unregister_driver(&vfio_ap_matrix_driver); 2010 return ret; 2011 } 2012 2013 void vfio_ap_mdev_unregister(void) 2014 { 2015 mdev_unregister_parent(&matrix_dev->parent); 2016 mdev_unregister_driver(&vfio_ap_matrix_driver); 2017 } 2018 2019 int vfio_ap_mdev_probe_queue(struct ap_device *apdev) 2020 { 2021 int ret; 2022 struct vfio_ap_queue *q; 2023 struct ap_matrix_mdev *matrix_mdev; 2024 2025 ret = sysfs_create_group(&apdev->device.kobj, &vfio_queue_attr_group); 2026 if (ret) 2027 return ret; 2028 2029 q = kzalloc(sizeof(*q), GFP_KERNEL); 2030 if (!q) { 2031 ret = -ENOMEM; 2032 goto err_remove_group; 2033 } 2034 2035 q->apqn = to_ap_queue(&apdev->device)->qid; 2036 q->saved_isc = VFIO_AP_ISC_INVALID; 2037 matrix_mdev = get_update_locks_by_apqn(q->apqn); 2038 2039 if (matrix_mdev) { 2040 vfio_ap_mdev_link_queue(matrix_mdev, q); 2041 2042 if (vfio_ap_mdev_filter_matrix(matrix_mdev->matrix.apm, 2043 matrix_mdev->matrix.aqm, 2044 matrix_mdev)) 2045 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 2046 } 2047 dev_set_drvdata(&apdev->device, q); 2048 release_update_locks_for_mdev(matrix_mdev); 2049 2050 return 0; 2051 2052 err_remove_group: 2053 sysfs_remove_group(&apdev->device.kobj, &vfio_queue_attr_group); 2054 return ret; 2055 } 2056 2057 void vfio_ap_mdev_remove_queue(struct ap_device *apdev) 2058 { 2059 unsigned long apid, apqi; 2060 struct vfio_ap_queue *q; 2061 struct ap_matrix_mdev *matrix_mdev; 2062 2063 sysfs_remove_group(&apdev->device.kobj, &vfio_queue_attr_group); 2064 q = dev_get_drvdata(&apdev->device); 2065 get_update_locks_for_queue(q); 2066 matrix_mdev = q->matrix_mdev; 2067 2068 if (matrix_mdev) { 2069 vfio_ap_unlink_queue_fr_mdev(q); 2070 2071 apid = AP_QID_CARD(q->apqn); 2072 apqi = AP_QID_QUEUE(q->apqn); 2073 2074 /* 2075 * If the queue is assigned to the guest's APCB, then remove 2076 * the adapter's APID from the APCB and hot it into the guest. 2077 */ 2078 if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) && 2079 test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) { 2080 clear_bit_inv(apid, matrix_mdev->shadow_apcb.apm); 2081 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 2082 } 2083 } 2084 2085 vfio_ap_mdev_reset_queue(q); 2086 dev_set_drvdata(&apdev->device, NULL); 2087 kfree(q); 2088 release_update_locks_for_mdev(matrix_mdev); 2089 } 2090 2091 /** 2092 * vfio_ap_mdev_resource_in_use: check whether any of a set of APQNs is 2093 * assigned to a mediated device under the control 2094 * of the vfio_ap device driver. 2095 * 2096 * @apm: a bitmap specifying a set of APIDs comprising the APQNs to check. 2097 * @aqm: a bitmap specifying a set of APQIs comprising the APQNs to check. 2098 * 2099 * Return: 2100 * * -EADDRINUSE if one or more of the APQNs specified via @apm/@aqm are 2101 * assigned to a mediated device under the control of the vfio_ap 2102 * device driver. 2103 * * Otherwise, return 0. 2104 */ 2105 int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm) 2106 { 2107 int ret; 2108 2109 mutex_lock(&matrix_dev->guests_lock); 2110 mutex_lock(&matrix_dev->mdevs_lock); 2111 ret = vfio_ap_mdev_verify_no_sharing(apm, aqm); 2112 mutex_unlock(&matrix_dev->mdevs_lock); 2113 mutex_unlock(&matrix_dev->guests_lock); 2114 2115 return ret; 2116 } 2117 2118 /** 2119 * vfio_ap_mdev_hot_unplug_cfg - hot unplug the adapters, domains and control 2120 * domains that have been removed from the host's 2121 * AP configuration from a guest. 2122 * 2123 * @matrix_mdev: an ap_matrix_mdev object attached to a KVM guest. 2124 * @aprem: the adapters that have been removed from the host's AP configuration 2125 * @aqrem: the domains that have been removed from the host's AP configuration 2126 * @cdrem: the control domains that have been removed from the host's AP 2127 * configuration. 2128 */ 2129 static void vfio_ap_mdev_hot_unplug_cfg(struct ap_matrix_mdev *matrix_mdev, 2130 unsigned long *aprem, 2131 unsigned long *aqrem, 2132 unsigned long *cdrem) 2133 { 2134 int do_hotplug = 0; 2135 2136 if (!bitmap_empty(aprem, AP_DEVICES)) { 2137 do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.apm, 2138 matrix_mdev->shadow_apcb.apm, 2139 aprem, AP_DEVICES); 2140 } 2141 2142 if (!bitmap_empty(aqrem, AP_DOMAINS)) { 2143 do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.aqm, 2144 matrix_mdev->shadow_apcb.aqm, 2145 aqrem, AP_DEVICES); 2146 } 2147 2148 if (!bitmap_empty(cdrem, AP_DOMAINS)) 2149 do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.adm, 2150 matrix_mdev->shadow_apcb.adm, 2151 cdrem, AP_DOMAINS); 2152 2153 if (do_hotplug) 2154 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 2155 } 2156 2157 /** 2158 * vfio_ap_mdev_cfg_remove - determines which guests are using the adapters, 2159 * domains and control domains that have been removed 2160 * from the host AP configuration and unplugs them 2161 * from those guests. 2162 * 2163 * @ap_remove: bitmap specifying which adapters have been removed from the host 2164 * config. 2165 * @aq_remove: bitmap specifying which domains have been removed from the host 2166 * config. 2167 * @cd_remove: bitmap specifying which control domains have been removed from 2168 * the host config. 2169 */ 2170 static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove, 2171 unsigned long *aq_remove, 2172 unsigned long *cd_remove) 2173 { 2174 struct ap_matrix_mdev *matrix_mdev; 2175 DECLARE_BITMAP(aprem, AP_DEVICES); 2176 DECLARE_BITMAP(aqrem, AP_DOMAINS); 2177 DECLARE_BITMAP(cdrem, AP_DOMAINS); 2178 int do_remove = 0; 2179 2180 list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { 2181 mutex_lock(&matrix_mdev->kvm->lock); 2182 mutex_lock(&matrix_dev->mdevs_lock); 2183 2184 do_remove |= bitmap_and(aprem, ap_remove, 2185 matrix_mdev->matrix.apm, 2186 AP_DEVICES); 2187 do_remove |= bitmap_and(aqrem, aq_remove, 2188 matrix_mdev->matrix.aqm, 2189 AP_DOMAINS); 2190 do_remove |= bitmap_andnot(cdrem, cd_remove, 2191 matrix_mdev->matrix.adm, 2192 AP_DOMAINS); 2193 2194 if (do_remove) 2195 vfio_ap_mdev_hot_unplug_cfg(matrix_mdev, aprem, aqrem, 2196 cdrem); 2197 2198 mutex_unlock(&matrix_dev->mdevs_lock); 2199 mutex_unlock(&matrix_mdev->kvm->lock); 2200 } 2201 } 2202 2203 /** 2204 * vfio_ap_mdev_on_cfg_remove - responds to the removal of adapters, domains and 2205 * control domains from the host AP configuration 2206 * by unplugging them from the guests that are 2207 * using them. 2208 * @cur_config_info: the current host AP configuration information 2209 * @prev_config_info: the previous host AP configuration information 2210 */ 2211 static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info, 2212 struct ap_config_info *prev_config_info) 2213 { 2214 int do_remove; 2215 DECLARE_BITMAP(aprem, AP_DEVICES); 2216 DECLARE_BITMAP(aqrem, AP_DOMAINS); 2217 DECLARE_BITMAP(cdrem, AP_DOMAINS); 2218 2219 do_remove = bitmap_andnot(aprem, 2220 (unsigned long *)prev_config_info->apm, 2221 (unsigned long *)cur_config_info->apm, 2222 AP_DEVICES); 2223 do_remove |= bitmap_andnot(aqrem, 2224 (unsigned long *)prev_config_info->aqm, 2225 (unsigned long *)cur_config_info->aqm, 2226 AP_DEVICES); 2227 do_remove |= bitmap_andnot(cdrem, 2228 (unsigned long *)prev_config_info->adm, 2229 (unsigned long *)cur_config_info->adm, 2230 AP_DEVICES); 2231 2232 if (do_remove) 2233 vfio_ap_mdev_cfg_remove(aprem, aqrem, cdrem); 2234 } 2235 2236 /** 2237 * vfio_ap_filter_apid_by_qtype: filter APIDs from an AP mask for adapters that 2238 * are older than AP type 10 (CEX4). 2239 * @apm: a bitmap of the APIDs to examine 2240 * @aqm: a bitmap of the APQIs of the queues to query for the AP type. 2241 */ 2242 static void vfio_ap_filter_apid_by_qtype(unsigned long *apm, unsigned long *aqm) 2243 { 2244 bool apid_cleared; 2245 struct ap_queue_status status; 2246 unsigned long apid, apqi; 2247 struct ap_tapq_gr2 info; 2248 2249 for_each_set_bit_inv(apid, apm, AP_DEVICES) { 2250 apid_cleared = false; 2251 2252 for_each_set_bit_inv(apqi, aqm, AP_DOMAINS) { 2253 status = ap_test_queue(AP_MKQID(apid, apqi), 1, &info); 2254 switch (status.response_code) { 2255 /* 2256 * According to the architecture in each case 2257 * below, the queue's info should be filled. 2258 */ 2259 case AP_RESPONSE_NORMAL: 2260 case AP_RESPONSE_RESET_IN_PROGRESS: 2261 case AP_RESPONSE_DECONFIGURED: 2262 case AP_RESPONSE_CHECKSTOPPED: 2263 case AP_RESPONSE_BUSY: 2264 /* 2265 * The vfio_ap device driver only 2266 * supports CEX4 and newer adapters, so 2267 * remove the APID if the adapter is 2268 * older than a CEX4. 2269 */ 2270 if (info.at < AP_DEVICE_TYPE_CEX4) { 2271 clear_bit_inv(apid, apm); 2272 apid_cleared = true; 2273 } 2274 2275 break; 2276 2277 default: 2278 /* 2279 * If we don't know the adapter type, 2280 * clear its APID since it can't be 2281 * determined whether the vfio_ap 2282 * device driver supports it. 2283 */ 2284 clear_bit_inv(apid, apm); 2285 apid_cleared = true; 2286 break; 2287 } 2288 2289 /* 2290 * If we've already cleared the APID from the apm, there 2291 * is no need to continue examining the remainin AP 2292 * queues to determine the type of the adapter. 2293 */ 2294 if (apid_cleared) 2295 continue; 2296 } 2297 } 2298 } 2299 2300 /** 2301 * vfio_ap_mdev_cfg_add - store bitmaps specifying the adapters, domains and 2302 * control domains that have been added to the host's 2303 * AP configuration for each matrix mdev to which they 2304 * are assigned. 2305 * 2306 * @apm_add: a bitmap specifying the adapters that have been added to the AP 2307 * configuration. 2308 * @aqm_add: a bitmap specifying the domains that have been added to the AP 2309 * configuration. 2310 * @adm_add: a bitmap specifying the control domains that have been added to the 2311 * AP configuration. 2312 */ 2313 static void vfio_ap_mdev_cfg_add(unsigned long *apm_add, unsigned long *aqm_add, 2314 unsigned long *adm_add) 2315 { 2316 struct ap_matrix_mdev *matrix_mdev; 2317 2318 if (list_empty(&matrix_dev->mdev_list)) 2319 return; 2320 2321 vfio_ap_filter_apid_by_qtype(apm_add, aqm_add); 2322 2323 list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { 2324 bitmap_and(matrix_mdev->apm_add, 2325 matrix_mdev->matrix.apm, apm_add, AP_DEVICES); 2326 bitmap_and(matrix_mdev->aqm_add, 2327 matrix_mdev->matrix.aqm, aqm_add, AP_DOMAINS); 2328 bitmap_and(matrix_mdev->adm_add, 2329 matrix_mdev->matrix.adm, adm_add, AP_DEVICES); 2330 } 2331 } 2332 2333 /** 2334 * vfio_ap_mdev_on_cfg_add - responds to the addition of adapters, domains and 2335 * control domains to the host AP configuration 2336 * by updating the bitmaps that specify what adapters, 2337 * domains and control domains have been added so they 2338 * can be hot plugged into the guest when the AP bus 2339 * scan completes (see vfio_ap_on_scan_complete 2340 * function). 2341 * @cur_config_info: the current AP configuration information 2342 * @prev_config_info: the previous AP configuration information 2343 */ 2344 static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info, 2345 struct ap_config_info *prev_config_info) 2346 { 2347 bool do_add; 2348 DECLARE_BITMAP(apm_add, AP_DEVICES); 2349 DECLARE_BITMAP(aqm_add, AP_DOMAINS); 2350 DECLARE_BITMAP(adm_add, AP_DOMAINS); 2351 2352 do_add = bitmap_andnot(apm_add, 2353 (unsigned long *)cur_config_info->apm, 2354 (unsigned long *)prev_config_info->apm, 2355 AP_DEVICES); 2356 do_add |= bitmap_andnot(aqm_add, 2357 (unsigned long *)cur_config_info->aqm, 2358 (unsigned long *)prev_config_info->aqm, 2359 AP_DOMAINS); 2360 do_add |= bitmap_andnot(adm_add, 2361 (unsigned long *)cur_config_info->adm, 2362 (unsigned long *)prev_config_info->adm, 2363 AP_DOMAINS); 2364 2365 if (do_add) 2366 vfio_ap_mdev_cfg_add(apm_add, aqm_add, adm_add); 2367 } 2368 2369 /** 2370 * vfio_ap_on_cfg_changed - handles notification of changes to the host AP 2371 * configuration. 2372 * 2373 * @cur_cfg_info: the current host AP configuration 2374 * @prev_cfg_info: the previous host AP configuration 2375 */ 2376 void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info, 2377 struct ap_config_info *prev_cfg_info) 2378 { 2379 if (!cur_cfg_info || !prev_cfg_info) 2380 return; 2381 2382 mutex_lock(&matrix_dev->guests_lock); 2383 2384 vfio_ap_mdev_on_cfg_remove(cur_cfg_info, prev_cfg_info); 2385 vfio_ap_mdev_on_cfg_add(cur_cfg_info, prev_cfg_info); 2386 memcpy(&matrix_dev->info, cur_cfg_info, sizeof(*cur_cfg_info)); 2387 2388 mutex_unlock(&matrix_dev->guests_lock); 2389 } 2390 2391 static void vfio_ap_mdev_hot_plug_cfg(struct ap_matrix_mdev *matrix_mdev) 2392 { 2393 bool do_hotplug = false; 2394 int filter_domains = 0; 2395 int filter_adapters = 0; 2396 DECLARE_BITMAP(apm, AP_DEVICES); 2397 DECLARE_BITMAP(aqm, AP_DOMAINS); 2398 2399 mutex_lock(&matrix_mdev->kvm->lock); 2400 mutex_lock(&matrix_dev->mdevs_lock); 2401 2402 filter_adapters = bitmap_and(apm, matrix_mdev->matrix.apm, 2403 matrix_mdev->apm_add, AP_DEVICES); 2404 filter_domains = bitmap_and(aqm, matrix_mdev->matrix.aqm, 2405 matrix_mdev->aqm_add, AP_DOMAINS); 2406 2407 if (filter_adapters && filter_domains) 2408 do_hotplug |= vfio_ap_mdev_filter_matrix(apm, aqm, matrix_mdev); 2409 else if (filter_adapters) 2410 do_hotplug |= 2411 vfio_ap_mdev_filter_matrix(apm, 2412 matrix_mdev->shadow_apcb.aqm, 2413 matrix_mdev); 2414 else 2415 do_hotplug |= 2416 vfio_ap_mdev_filter_matrix(matrix_mdev->shadow_apcb.apm, 2417 aqm, matrix_mdev); 2418 2419 if (bitmap_intersects(matrix_mdev->matrix.adm, matrix_mdev->adm_add, 2420 AP_DOMAINS)) 2421 do_hotplug |= vfio_ap_mdev_filter_cdoms(matrix_mdev); 2422 2423 if (do_hotplug) 2424 vfio_ap_mdev_update_guest_apcb(matrix_mdev); 2425 2426 mutex_unlock(&matrix_dev->mdevs_lock); 2427 mutex_unlock(&matrix_mdev->kvm->lock); 2428 } 2429 2430 void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info, 2431 struct ap_config_info *old_config_info) 2432 { 2433 struct ap_matrix_mdev *matrix_mdev; 2434 2435 mutex_lock(&matrix_dev->guests_lock); 2436 2437 list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { 2438 if (bitmap_empty(matrix_mdev->apm_add, AP_DEVICES) && 2439 bitmap_empty(matrix_mdev->aqm_add, AP_DOMAINS) && 2440 bitmap_empty(matrix_mdev->adm_add, AP_DOMAINS)) 2441 continue; 2442 2443 vfio_ap_mdev_hot_plug_cfg(matrix_mdev); 2444 bitmap_clear(matrix_mdev->apm_add, 0, AP_DEVICES); 2445 bitmap_clear(matrix_mdev->aqm_add, 0, AP_DOMAINS); 2446 bitmap_clear(matrix_mdev->adm_add, 0, AP_DOMAINS); 2447 } 2448 2449 mutex_unlock(&matrix_dev->guests_lock); 2450 } 2451