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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2018-2020 Intel Corporation.4 * Copyright (C) 2020 Red Hat, Inc.5 *6 * Author: Tiwei Bie <tiwei.bie@intel.com>7 * Jason Wang <jasowang@redhat.com>8 *9 * Thanks Michael S. Tsirkin for the valuable comments and10 * suggestions. And thanks to Cunming Liang and Zhihong Wang for all11 * their supports.12 */13 14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/cdev.h>17#include <linux/device.h>18#include <linux/mm.h>19#include <linux/slab.h>20#include <linux/iommu.h>21#include <linux/uuid.h>22#include <linux/vdpa.h>23#include <linux/nospec.h>24#include <linux/vhost.h>25 26#include "vhost.h"27 28enum {29 VHOST_VDPA_BACKEND_FEATURES =30 (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) |31 (1ULL << VHOST_BACKEND_F_IOTLB_BATCH) |32 (1ULL << VHOST_BACKEND_F_IOTLB_ASID),33};34 35#define VHOST_VDPA_DEV_MAX (1U << MINORBITS)36 37#define VHOST_VDPA_IOTLB_BUCKETS 1638 39struct vhost_vdpa_as {40 struct hlist_node hash_link;41 struct vhost_iotlb iotlb;42 u32 id;43};44 45struct vhost_vdpa {46 struct vhost_dev vdev;47 struct iommu_domain *domain;48 struct vhost_virtqueue *vqs;49 struct completion completion;50 struct vdpa_device *vdpa;51 struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS];52 struct device dev;53 struct cdev cdev;54 atomic_t opened;55 u32 nvqs;56 int virtio_id;57 int minor;58 struct eventfd_ctx *config_ctx;59 int in_batch;60 struct vdpa_iova_range range;61 u32 batch_asid;62 bool suspended;63};64 65static DEFINE_IDA(vhost_vdpa_ida);66 67static dev_t vhost_vdpa_major;68 69static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,70 struct vhost_iotlb *iotlb, u64 start,71 u64 last, u32 asid);72 73static inline u32 iotlb_to_asid(struct vhost_iotlb *iotlb)74{75 struct vhost_vdpa_as *as = container_of(iotlb, struct76 vhost_vdpa_as, iotlb);77 return as->id;78}79 80static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid)81{82 struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];83 struct vhost_vdpa_as *as;84 85 hlist_for_each_entry(as, head, hash_link)86 if (as->id == asid)87 return as;88 89 return NULL;90}91 92static struct vhost_iotlb *asid_to_iotlb(struct vhost_vdpa *v, u32 asid)93{94 struct vhost_vdpa_as *as = asid_to_as(v, asid);95 96 if (!as)97 return NULL;98 99 return &as->iotlb;100}101 102static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid)103{104 struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];105 struct vhost_vdpa_as *as;106 107 if (asid_to_as(v, asid))108 return NULL;109 110 if (asid >= v->vdpa->nas)111 return NULL;112 113 as = kmalloc(sizeof(*as), GFP_KERNEL);114 if (!as)115 return NULL;116 117 vhost_iotlb_init(&as->iotlb, 0, 0);118 as->id = asid;119 hlist_add_head(&as->hash_link, head);120 121 return as;122}123 124static struct vhost_vdpa_as *vhost_vdpa_find_alloc_as(struct vhost_vdpa *v,125 u32 asid)126{127 struct vhost_vdpa_as *as = asid_to_as(v, asid);128 129 if (as)130 return as;131 132 return vhost_vdpa_alloc_as(v, asid);133}134 135static void vhost_vdpa_reset_map(struct vhost_vdpa *v, u32 asid)136{137 struct vdpa_device *vdpa = v->vdpa;138 const struct vdpa_config_ops *ops = vdpa->config;139 140 if (ops->reset_map)141 ops->reset_map(vdpa, asid);142}143 144static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid)145{146 struct vhost_vdpa_as *as = asid_to_as(v, asid);147 148 if (!as)149 return -EINVAL;150 151 hlist_del(&as->hash_link);152 vhost_vdpa_iotlb_unmap(v, &as->iotlb, 0ULL, 0ULL - 1, asid);153 /*154 * Devices with vendor specific IOMMU may need to restore155 * iotlb to the initial or default state, which cannot be156 * cleaned up in the all range unmap call above. Give them157 * a chance to clean up or reset the map to the desired158 * state.159 */160 vhost_vdpa_reset_map(v, asid);161 kfree(as);162 163 return 0;164}165 166static void handle_vq_kick(struct vhost_work *work)167{168 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,169 poll.work);170 struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev);171 const struct vdpa_config_ops *ops = v->vdpa->config;172 173 ops->kick_vq(v->vdpa, vq - v->vqs);174}175 176static irqreturn_t vhost_vdpa_virtqueue_cb(void *private)177{178 struct vhost_virtqueue *vq = private;179 struct eventfd_ctx *call_ctx = vq->call_ctx.ctx;180 181 if (call_ctx)182 eventfd_signal(call_ctx);183 184 return IRQ_HANDLED;185}186 187static irqreturn_t vhost_vdpa_config_cb(void *private)188{189 struct vhost_vdpa *v = private;190 struct eventfd_ctx *config_ctx = v->config_ctx;191 192 if (config_ctx)193 eventfd_signal(config_ctx);194 195 return IRQ_HANDLED;196}197 198static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)199{200 struct vhost_virtqueue *vq = &v->vqs[qid];201 const struct vdpa_config_ops *ops = v->vdpa->config;202 struct vdpa_device *vdpa = v->vdpa;203 int ret, irq;204 205 if (!ops->get_vq_irq)206 return;207 208 irq = ops->get_vq_irq(vdpa, qid);209 if (irq < 0)210 return;211 212 if (!vq->call_ctx.ctx)213 return;214 215 vq->call_ctx.producer.irq = irq;216 ret = irq_bypass_register_producer(&vq->call_ctx.producer);217 if (unlikely(ret))218 dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret = %d\n",219 qid, vq->call_ctx.producer.token, ret);220}221 222static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)223{224 struct vhost_virtqueue *vq = &v->vqs[qid];225 226 irq_bypass_unregister_producer(&vq->call_ctx.producer);227}228 229static int _compat_vdpa_reset(struct vhost_vdpa *v)230{231 struct vdpa_device *vdpa = v->vdpa;232 u32 flags = 0;233 234 v->suspended = false;235 236 if (v->vdev.vqs) {237 flags |= !vhost_backend_has_feature(v->vdev.vqs[0],238 VHOST_BACKEND_F_IOTLB_PERSIST) ?239 VDPA_RESET_F_CLEAN_MAP : 0;240 }241 242 return vdpa_reset(vdpa, flags);243}244 245static int vhost_vdpa_reset(struct vhost_vdpa *v)246{247 v->in_batch = 0;248 return _compat_vdpa_reset(v);249}250 251static long vhost_vdpa_bind_mm(struct vhost_vdpa *v)252{253 struct vdpa_device *vdpa = v->vdpa;254 const struct vdpa_config_ops *ops = vdpa->config;255 256 if (!vdpa->use_va || !ops->bind_mm)257 return 0;258 259 return ops->bind_mm(vdpa, v->vdev.mm);260}261 262static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v)263{264 struct vdpa_device *vdpa = v->vdpa;265 const struct vdpa_config_ops *ops = vdpa->config;266 267 if (!vdpa->use_va || !ops->unbind_mm)268 return;269 270 ops->unbind_mm(vdpa);271}272 273static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)274{275 struct vdpa_device *vdpa = v->vdpa;276 const struct vdpa_config_ops *ops = vdpa->config;277 u32 device_id;278 279 device_id = ops->get_device_id(vdpa);280 281 if (copy_to_user(argp, &device_id, sizeof(device_id)))282 return -EFAULT;283 284 return 0;285}286 287static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp)288{289 struct vdpa_device *vdpa = v->vdpa;290 const struct vdpa_config_ops *ops = vdpa->config;291 u8 status;292 293 status = ops->get_status(vdpa);294 295 if (copy_to_user(statusp, &status, sizeof(status)))296 return -EFAULT;297 298 return 0;299}300 301static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)302{303 struct vdpa_device *vdpa = v->vdpa;304 const struct vdpa_config_ops *ops = vdpa->config;305 u8 status, status_old;306 u32 nvqs = v->nvqs;307 int ret;308 u16 i;309 310 if (copy_from_user(&status, statusp, sizeof(status)))311 return -EFAULT;312 313 status_old = ops->get_status(vdpa);314 315 /*316 * Userspace shouldn't remove status bits unless reset the317 * status to 0.318 */319 if (status != 0 && (status_old & ~status) != 0)320 return -EINVAL;321 322 if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))323 for (i = 0; i < nvqs; i++)324 vhost_vdpa_unsetup_vq_irq(v, i);325 326 if (status == 0) {327 ret = _compat_vdpa_reset(v);328 if (ret)329 return ret;330 } else331 vdpa_set_status(vdpa, status);332 333 if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK))334 for (i = 0; i < nvqs; i++)335 vhost_vdpa_setup_vq_irq(v, i);336 337 return 0;338}339 340static int vhost_vdpa_config_validate(struct vhost_vdpa *v,341 struct vhost_vdpa_config *c)342{343 struct vdpa_device *vdpa = v->vdpa;344 size_t size = vdpa->config->get_config_size(vdpa);345 346 if (c->len == 0 || c->off > size)347 return -EINVAL;348 349 if (c->len > size - c->off)350 return -E2BIG;351 352 return 0;353}354 355static long vhost_vdpa_get_config(struct vhost_vdpa *v,356 struct vhost_vdpa_config __user *c)357{358 struct vdpa_device *vdpa = v->vdpa;359 struct vhost_vdpa_config config;360 unsigned long size = offsetof(struct vhost_vdpa_config, buf);361 u8 *buf;362 363 if (copy_from_user(&config, c, size))364 return -EFAULT;365 if (vhost_vdpa_config_validate(v, &config))366 return -EINVAL;367 buf = kvzalloc(config.len, GFP_KERNEL);368 if (!buf)369 return -ENOMEM;370 371 vdpa_get_config(vdpa, config.off, buf, config.len);372 373 if (copy_to_user(c->buf, buf, config.len)) {374 kvfree(buf);375 return -EFAULT;376 }377 378 kvfree(buf);379 return 0;380}381 382static long vhost_vdpa_set_config(struct vhost_vdpa *v,383 struct vhost_vdpa_config __user *c)384{385 struct vdpa_device *vdpa = v->vdpa;386 struct vhost_vdpa_config config;387 unsigned long size = offsetof(struct vhost_vdpa_config, buf);388 u8 *buf;389 390 if (copy_from_user(&config, c, size))391 return -EFAULT;392 if (vhost_vdpa_config_validate(v, &config))393 return -EINVAL;394 395 buf = vmemdup_user(c->buf, config.len);396 if (IS_ERR(buf))397 return PTR_ERR(buf);398 399 vdpa_set_config(vdpa, config.off, buf, config.len);400 401 kvfree(buf);402 return 0;403}404 405static bool vhost_vdpa_can_suspend(const struct vhost_vdpa *v)406{407 struct vdpa_device *vdpa = v->vdpa;408 const struct vdpa_config_ops *ops = vdpa->config;409 410 return ops->suspend;411}412 413static bool vhost_vdpa_can_resume(const struct vhost_vdpa *v)414{415 struct vdpa_device *vdpa = v->vdpa;416 const struct vdpa_config_ops *ops = vdpa->config;417 418 return ops->resume;419}420 421static bool vhost_vdpa_has_desc_group(const struct vhost_vdpa *v)422{423 struct vdpa_device *vdpa = v->vdpa;424 const struct vdpa_config_ops *ops = vdpa->config;425 426 return ops->get_vq_desc_group;427}428 429static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep)430{431 struct vdpa_device *vdpa = v->vdpa;432 const struct vdpa_config_ops *ops = vdpa->config;433 u64 features;434 435 features = ops->get_device_features(vdpa);436 437 if (copy_to_user(featurep, &features, sizeof(features)))438 return -EFAULT;439 440 return 0;441}442 443static u64 vhost_vdpa_get_backend_features(const struct vhost_vdpa *v)444{445 struct vdpa_device *vdpa = v->vdpa;446 const struct vdpa_config_ops *ops = vdpa->config;447 448 if (!ops->get_backend_features)449 return 0;450 else451 return ops->get_backend_features(vdpa);452}453 454static bool vhost_vdpa_has_persistent_map(const struct vhost_vdpa *v)455{456 struct vdpa_device *vdpa = v->vdpa;457 const struct vdpa_config_ops *ops = vdpa->config;458 459 return (!ops->set_map && !ops->dma_map) || ops->reset_map ||460 vhost_vdpa_get_backend_features(v) & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST);461}462 463static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep)464{465 struct vdpa_device *vdpa = v->vdpa;466 const struct vdpa_config_ops *ops = vdpa->config;467 struct vhost_dev *d = &v->vdev;468 u64 actual_features;469 u64 features;470 int i;471 472 /*473 * It's not allowed to change the features after they have474 * been negotiated.475 */476 if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK)477 return -EBUSY;478 479 if (copy_from_user(&features, featurep, sizeof(features)))480 return -EFAULT;481 482 if (vdpa_set_features(vdpa, features))483 return -EINVAL;484 485 /* let the vqs know what has been configured */486 actual_features = ops->get_driver_features(vdpa);487 for (i = 0; i < d->nvqs; ++i) {488 struct vhost_virtqueue *vq = d->vqs[i];489 490 mutex_lock(&vq->mutex);491 vq->acked_features = actual_features;492 mutex_unlock(&vq->mutex);493 }494 495 return 0;496}497 498static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp)499{500 struct vdpa_device *vdpa = v->vdpa;501 const struct vdpa_config_ops *ops = vdpa->config;502 u16 num;503 504 num = ops->get_vq_num_max(vdpa);505 506 if (copy_to_user(argp, &num, sizeof(num)))507 return -EFAULT;508 509 return 0;510}511 512static void vhost_vdpa_config_put(struct vhost_vdpa *v)513{514 if (v->config_ctx) {515 eventfd_ctx_put(v->config_ctx);516 v->config_ctx = NULL;517 }518}519 520static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)521{522 struct vdpa_callback cb;523 int fd;524 struct eventfd_ctx *ctx;525 526 cb.callback = vhost_vdpa_config_cb;527 cb.private = v;528 if (copy_from_user(&fd, argp, sizeof(fd)))529 return -EFAULT;530 531 ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);532 swap(ctx, v->config_ctx);533 534 if (!IS_ERR_OR_NULL(ctx))535 eventfd_ctx_put(ctx);536 537 if (IS_ERR(v->config_ctx)) {538 long ret = PTR_ERR(v->config_ctx);539 540 v->config_ctx = NULL;541 return ret;542 }543 544 v->vdpa->config->set_config_cb(v->vdpa, &cb);545 546 return 0;547}548 549static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)550{551 struct vhost_vdpa_iova_range range = {552 .first = v->range.first,553 .last = v->range.last,554 };555 556 if (copy_to_user(argp, &range, sizeof(range)))557 return -EFAULT;558 return 0;559}560 561static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)562{563 struct vdpa_device *vdpa = v->vdpa;564 const struct vdpa_config_ops *ops = vdpa->config;565 u32 size;566 567 size = ops->get_config_size(vdpa);568 569 if (copy_to_user(argp, &size, sizeof(size)))570 return -EFAULT;571 572 return 0;573}574 575static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)576{577 struct vdpa_device *vdpa = v->vdpa;578 579 if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))580 return -EFAULT;581 582 return 0;583}584 585/* After a successful return of ioctl the device must not process more586 * virtqueue descriptors. The device can answer to read or writes of config587 * fields as if it were not suspended. In particular, writing to "queue_enable"588 * with a value of 1 will not make the device start processing buffers.589 */590static long vhost_vdpa_suspend(struct vhost_vdpa *v)591{592 struct vdpa_device *vdpa = v->vdpa;593 const struct vdpa_config_ops *ops = vdpa->config;594 int ret;595 596 if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))597 return 0;598 599 if (!ops->suspend)600 return -EOPNOTSUPP;601 602 ret = ops->suspend(vdpa);603 if (!ret)604 v->suspended = true;605 606 return ret;607}608 609/* After a successful return of this ioctl the device resumes processing610 * virtqueue descriptors. The device becomes fully operational the same way it611 * was before it was suspended.612 */613static long vhost_vdpa_resume(struct vhost_vdpa *v)614{615 struct vdpa_device *vdpa = v->vdpa;616 const struct vdpa_config_ops *ops = vdpa->config;617 int ret;618 619 if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))620 return 0;621 622 if (!ops->resume)623 return -EOPNOTSUPP;624 625 ret = ops->resume(vdpa);626 if (!ret)627 v->suspended = false;628 629 return ret;630}631 632static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,633 void __user *argp)634{635 struct vdpa_device *vdpa = v->vdpa;636 const struct vdpa_config_ops *ops = vdpa->config;637 struct vdpa_vq_state vq_state;638 struct vdpa_callback cb;639 struct vhost_virtqueue *vq;640 struct vhost_vring_state s;641 u32 idx;642 long r;643 644 r = get_user(idx, (u32 __user *)argp);645 if (r < 0)646 return r;647 648 if (idx >= v->nvqs)649 return -ENOBUFS;650 651 idx = array_index_nospec(idx, v->nvqs);652 vq = &v->vqs[idx];653 654 switch (cmd) {655 case VHOST_VDPA_SET_VRING_ENABLE:656 if (copy_from_user(&s, argp, sizeof(s)))657 return -EFAULT;658 ops->set_vq_ready(vdpa, idx, s.num);659 return 0;660 case VHOST_VDPA_GET_VRING_GROUP:661 if (!ops->get_vq_group)662 return -EOPNOTSUPP;663 s.index = idx;664 s.num = ops->get_vq_group(vdpa, idx);665 if (s.num >= vdpa->ngroups)666 return -EIO;667 else if (copy_to_user(argp, &s, sizeof(s)))668 return -EFAULT;669 return 0;670 case VHOST_VDPA_GET_VRING_DESC_GROUP:671 if (!vhost_vdpa_has_desc_group(v))672 return -EOPNOTSUPP;673 s.index = idx;674 s.num = ops->get_vq_desc_group(vdpa, idx);675 if (s.num >= vdpa->ngroups)676 return -EIO;677 else if (copy_to_user(argp, &s, sizeof(s)))678 return -EFAULT;679 return 0;680 case VHOST_VDPA_SET_GROUP_ASID:681 if (copy_from_user(&s, argp, sizeof(s)))682 return -EFAULT;683 if (s.num >= vdpa->nas)684 return -EINVAL;685 if (!ops->set_group_asid)686 return -EOPNOTSUPP;687 return ops->set_group_asid(vdpa, idx, s.num);688 case VHOST_VDPA_GET_VRING_SIZE:689 if (!ops->get_vq_size)690 return -EOPNOTSUPP;691 s.index = idx;692 s.num = ops->get_vq_size(vdpa, idx);693 if (copy_to_user(argp, &s, sizeof(s)))694 return -EFAULT;695 return 0;696 case VHOST_GET_VRING_BASE:697 r = ops->get_vq_state(v->vdpa, idx, &vq_state);698 if (r)699 return r;700 701 if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {702 vq->last_avail_idx = vq_state.packed.last_avail_idx |703 (vq_state.packed.last_avail_counter << 15);704 vq->last_used_idx = vq_state.packed.last_used_idx |705 (vq_state.packed.last_used_counter << 15);706 } else {707 vq->last_avail_idx = vq_state.split.avail_index;708 }709 break;710 case VHOST_SET_VRING_CALL:711 if (vq->call_ctx.ctx) {712 if (ops->get_status(vdpa) &713 VIRTIO_CONFIG_S_DRIVER_OK)714 vhost_vdpa_unsetup_vq_irq(v, idx);715 vq->call_ctx.producer.token = NULL;716 }717 break;718 }719 720 r = vhost_vring_ioctl(&v->vdev, cmd, argp);721 if (r)722 return r;723 724 switch (cmd) {725 case VHOST_SET_VRING_ADDR:726 if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && !v->suspended)727 return -EINVAL;728 729 if (ops->set_vq_address(vdpa, idx,730 (u64)(uintptr_t)vq->desc,731 (u64)(uintptr_t)vq->avail,732 (u64)(uintptr_t)vq->used))733 r = -EINVAL;734 break;735 736 case VHOST_SET_VRING_BASE:737 if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && !v->suspended)738 return -EINVAL;739 740 if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {741 vq_state.packed.last_avail_idx = vq->last_avail_idx & 0x7fff;742 vq_state.packed.last_avail_counter = !!(vq->last_avail_idx & 0x8000);743 vq_state.packed.last_used_idx = vq->last_used_idx & 0x7fff;744 vq_state.packed.last_used_counter = !!(vq->last_used_idx & 0x8000);745 } else {746 vq_state.split.avail_index = vq->last_avail_idx;747 }748 r = ops->set_vq_state(vdpa, idx, &vq_state);749 break;750 751 case VHOST_SET_VRING_CALL:752 if (vq->call_ctx.ctx) {753 cb.callback = vhost_vdpa_virtqueue_cb;754 cb.private = vq;755 cb.trigger = vq->call_ctx.ctx;756 vq->call_ctx.producer.token = vq->call_ctx.ctx;757 if (ops->get_status(vdpa) &758 VIRTIO_CONFIG_S_DRIVER_OK)759 vhost_vdpa_setup_vq_irq(v, idx);760 } else {761 cb.callback = NULL;762 cb.private = NULL;763 cb.trigger = NULL;764 }765 ops->set_vq_cb(vdpa, idx, &cb);766 break;767 768 case VHOST_SET_VRING_NUM:769 ops->set_vq_num(vdpa, idx, vq->num);770 break;771 }772 773 return r;774}775 776static long vhost_vdpa_unlocked_ioctl(struct file *filep,777 unsigned int cmd, unsigned long arg)778{779 struct vhost_vdpa *v = filep->private_data;780 struct vhost_dev *d = &v->vdev;781 void __user *argp = (void __user *)arg;782 u64 __user *featurep = argp;783 u64 features;784 long r = 0;785 786 if (cmd == VHOST_SET_BACKEND_FEATURES) {787 if (copy_from_user(&features, featurep, sizeof(features)))788 return -EFAULT;789 if (features & ~(VHOST_VDPA_BACKEND_FEATURES |790 BIT_ULL(VHOST_BACKEND_F_DESC_ASID) |791 BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST) |792 BIT_ULL(VHOST_BACKEND_F_SUSPEND) |793 BIT_ULL(VHOST_BACKEND_F_RESUME) |794 BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK)))795 return -EOPNOTSUPP;796 if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) &&797 !vhost_vdpa_can_suspend(v))798 return -EOPNOTSUPP;799 if ((features & BIT_ULL(VHOST_BACKEND_F_RESUME)) &&800 !vhost_vdpa_can_resume(v))801 return -EOPNOTSUPP;802 if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) &&803 !(features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID)))804 return -EINVAL;805 if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) &&806 !vhost_vdpa_has_desc_group(v))807 return -EOPNOTSUPP;808 if ((features & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST)) &&809 !vhost_vdpa_has_persistent_map(v))810 return -EOPNOTSUPP;811 vhost_set_backend_features(&v->vdev, features);812 return 0;813 }814 815 mutex_lock(&d->mutex);816 817 switch (cmd) {818 case VHOST_VDPA_GET_DEVICE_ID:819 r = vhost_vdpa_get_device_id(v, argp);820 break;821 case VHOST_VDPA_GET_STATUS:822 r = vhost_vdpa_get_status(v, argp);823 break;824 case VHOST_VDPA_SET_STATUS:825 r = vhost_vdpa_set_status(v, argp);826 break;827 case VHOST_VDPA_GET_CONFIG:828 r = vhost_vdpa_get_config(v, argp);829 break;830 case VHOST_VDPA_SET_CONFIG:831 r = vhost_vdpa_set_config(v, argp);832 break;833 case VHOST_GET_FEATURES:834 r = vhost_vdpa_get_features(v, argp);835 break;836 case VHOST_SET_FEATURES:837 r = vhost_vdpa_set_features(v, argp);838 break;839 case VHOST_VDPA_GET_VRING_NUM:840 r = vhost_vdpa_get_vring_num(v, argp);841 break;842 case VHOST_VDPA_GET_GROUP_NUM:843 if (copy_to_user(argp, &v->vdpa->ngroups,844 sizeof(v->vdpa->ngroups)))845 r = -EFAULT;846 break;847 case VHOST_VDPA_GET_AS_NUM:848 if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas)))849 r = -EFAULT;850 break;851 case VHOST_SET_LOG_BASE:852 case VHOST_SET_LOG_FD:853 r = -ENOIOCTLCMD;854 break;855 case VHOST_VDPA_SET_CONFIG_CALL:856 r = vhost_vdpa_set_config_call(v, argp);857 break;858 case VHOST_GET_BACKEND_FEATURES:859 features = VHOST_VDPA_BACKEND_FEATURES;860 if (vhost_vdpa_can_suspend(v))861 features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND);862 if (vhost_vdpa_can_resume(v))863 features |= BIT_ULL(VHOST_BACKEND_F_RESUME);864 if (vhost_vdpa_has_desc_group(v))865 features |= BIT_ULL(VHOST_BACKEND_F_DESC_ASID);866 if (vhost_vdpa_has_persistent_map(v))867 features |= BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST);868 features |= vhost_vdpa_get_backend_features(v);869 if (copy_to_user(featurep, &features, sizeof(features)))870 r = -EFAULT;871 break;872 case VHOST_VDPA_GET_IOVA_RANGE:873 r = vhost_vdpa_get_iova_range(v, argp);874 break;875 case VHOST_VDPA_GET_CONFIG_SIZE:876 r = vhost_vdpa_get_config_size(v, argp);877 break;878 case VHOST_VDPA_GET_VQS_COUNT:879 r = vhost_vdpa_get_vqs_count(v, argp);880 break;881 case VHOST_VDPA_SUSPEND:882 r = vhost_vdpa_suspend(v);883 break;884 case VHOST_VDPA_RESUME:885 r = vhost_vdpa_resume(v);886 break;887 default:888 r = vhost_dev_ioctl(&v->vdev, cmd, argp);889 if (r == -ENOIOCTLCMD)890 r = vhost_vdpa_vring_ioctl(v, cmd, argp);891 break;892 }893 894 if (r)895 goto out;896 897 switch (cmd) {898 case VHOST_SET_OWNER:899 r = vhost_vdpa_bind_mm(v);900 if (r)901 vhost_dev_reset_owner(d, NULL);902 break;903 }904out:905 mutex_unlock(&d->mutex);906 return r;907}908static void vhost_vdpa_general_unmap(struct vhost_vdpa *v,909 struct vhost_iotlb_map *map, u32 asid)910{911 struct vdpa_device *vdpa = v->vdpa;912 const struct vdpa_config_ops *ops = vdpa->config;913 if (ops->dma_map) {914 ops->dma_unmap(vdpa, asid, map->start, map->size);915 } else if (ops->set_map == NULL) {916 iommu_unmap(v->domain, map->start, map->size);917 }918}919 920static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,921 u64 start, u64 last, u32 asid)922{923 struct vhost_dev *dev = &v->vdev;924 struct vhost_iotlb_map *map;925 struct page *page;926 unsigned long pfn, pinned;927 928 while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {929 pinned = PFN_DOWN(map->size);930 for (pfn = PFN_DOWN(map->addr);931 pinned > 0; pfn++, pinned--) {932 page = pfn_to_page(pfn);933 if (map->perm & VHOST_ACCESS_WO)934 set_page_dirty_lock(page);935 unpin_user_page(page);936 }937 atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);938 vhost_vdpa_general_unmap(v, map, asid);939 vhost_iotlb_map_free(iotlb, map);940 }941}942 943static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,944 u64 start, u64 last, u32 asid)945{946 struct vhost_iotlb_map *map;947 struct vdpa_map_file *map_file;948 949 while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {950 map_file = (struct vdpa_map_file *)map->opaque;951 fput(map_file->file);952 kfree(map_file);953 vhost_vdpa_general_unmap(v, map, asid);954 vhost_iotlb_map_free(iotlb, map);955 }956}957 958static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,959 struct vhost_iotlb *iotlb, u64 start,960 u64 last, u32 asid)961{962 struct vdpa_device *vdpa = v->vdpa;963 964 if (vdpa->use_va)965 return vhost_vdpa_va_unmap(v, iotlb, start, last, asid);966 967 return vhost_vdpa_pa_unmap(v, iotlb, start, last, asid);968}969 970static int perm_to_iommu_flags(u32 perm)971{972 int flags = 0;973 974 switch (perm) {975 case VHOST_ACCESS_WO:976 flags |= IOMMU_WRITE;977 break;978 case VHOST_ACCESS_RO:979 flags |= IOMMU_READ;980 break;981 case VHOST_ACCESS_RW:982 flags |= (IOMMU_WRITE | IOMMU_READ);983 break;984 default:985 WARN(1, "invalidate vhost IOTLB permission\n");986 break;987 }988 989 return flags | IOMMU_CACHE;990}991 992static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,993 u64 iova, u64 size, u64 pa, u32 perm, void *opaque)994{995 struct vhost_dev *dev = &v->vdev;996 struct vdpa_device *vdpa = v->vdpa;997 const struct vdpa_config_ops *ops = vdpa->config;998 u32 asid = iotlb_to_asid(iotlb);999 int r = 0;1000 1001 r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1,1002 pa, perm, opaque);1003 if (r)1004 return r;1005 1006 if (ops->dma_map) {1007 r = ops->dma_map(vdpa, asid, iova, size, pa, perm, opaque);1008 } else if (ops->set_map) {1009 if (!v->in_batch)1010 r = ops->set_map(vdpa, asid, iotlb);1011 } else {1012 r = iommu_map(v->domain, iova, pa, size,1013 perm_to_iommu_flags(perm),1014 GFP_KERNEL_ACCOUNT);1015 }1016 if (r) {1017 vhost_iotlb_del_range(iotlb, iova, iova + size - 1);1018 return r;1019 }1020 1021 if (!vdpa->use_va)1022 atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);1023 1024 return 0;1025}1026 1027static void vhost_vdpa_unmap(struct vhost_vdpa *v,1028 struct vhost_iotlb *iotlb,1029 u64 iova, u64 size)1030{1031 struct vdpa_device *vdpa = v->vdpa;1032 const struct vdpa_config_ops *ops = vdpa->config;1033 u32 asid = iotlb_to_asid(iotlb);1034 1035 vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1, asid);1036 1037 if (ops->set_map) {1038 if (!v->in_batch)1039 ops->set_map(vdpa, asid, iotlb);1040 }1041 1042}1043 1044static int vhost_vdpa_va_map(struct vhost_vdpa *v,1045 struct vhost_iotlb *iotlb,1046 u64 iova, u64 size, u64 uaddr, u32 perm)1047{1048 struct vhost_dev *dev = &v->vdev;1049 u64 offset, map_size, map_iova = iova;1050 struct vdpa_map_file *map_file;1051 struct vm_area_struct *vma;1052 int ret = 0;1053 1054 mmap_read_lock(dev->mm);1055 1056 while (size) {1057 vma = find_vma(dev->mm, uaddr);1058 if (!vma) {1059 ret = -EINVAL;1060 break;1061 }1062 map_size = min(size, vma->vm_end - uaddr);1063 if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) &&1064 !(vma->vm_flags & (VM_IO | VM_PFNMAP))))1065 goto next;1066 1067 map_file = kzalloc(sizeof(*map_file), GFP_KERNEL);1068 if (!map_file) {1069 ret = -ENOMEM;1070 break;1071 }1072 offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start;1073 map_file->offset = offset;1074 map_file->file = get_file(vma->vm_file);1075 ret = vhost_vdpa_map(v, iotlb, map_iova, map_size, uaddr,1076 perm, map_file);1077 if (ret) {1078 fput(map_file->file);1079 kfree(map_file);1080 break;1081 }1082next:1083 size -= map_size;1084 uaddr += map_size;1085 map_iova += map_size;1086 }1087 if (ret)1088 vhost_vdpa_unmap(v, iotlb, iova, map_iova - iova);1089 1090 mmap_read_unlock(dev->mm);1091 1092 return ret;1093}1094 1095static int vhost_vdpa_pa_map(struct vhost_vdpa *v,1096 struct vhost_iotlb *iotlb,1097 u64 iova, u64 size, u64 uaddr, u32 perm)1098{1099 struct vhost_dev *dev = &v->vdev;1100 struct page **page_list;1101 unsigned long list_size = PAGE_SIZE / sizeof(struct page *);1102 unsigned int gup_flags = FOLL_LONGTERM;1103 unsigned long npages, cur_base, map_pfn, last_pfn = 0;1104 unsigned long lock_limit, sz2pin, nchunks, i;1105 u64 start = iova;1106 long pinned;1107 int ret = 0;1108 1109 /* Limit the use of memory for bookkeeping */1110 page_list = (struct page **) __get_free_page(GFP_KERNEL);1111 if (!page_list)1112 return -ENOMEM;1113 1114 if (perm & VHOST_ACCESS_WO)1115 gup_flags |= FOLL_WRITE;1116 1117 npages = PFN_UP(size + (iova & ~PAGE_MASK));1118 if (!npages) {1119 ret = -EINVAL;1120 goto free;1121 }1122 1123 mmap_read_lock(dev->mm);1124 1125 lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK));1126 if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) {1127 ret = -ENOMEM;1128 goto unlock;1129 }1130 1131 cur_base = uaddr & PAGE_MASK;1132 iova &= PAGE_MASK;1133 nchunks = 0;1134 1135 while (npages) {1136 sz2pin = min_t(unsigned long, npages, list_size);1137 pinned = pin_user_pages(cur_base, sz2pin,1138 gup_flags, page_list);1139 if (sz2pin != pinned) {1140 if (pinned < 0) {1141 ret = pinned;1142 } else {1143 unpin_user_pages(page_list, pinned);1144 ret = -ENOMEM;1145 }1146 goto out;1147 }1148 nchunks++;1149 1150 if (!last_pfn)1151 map_pfn = page_to_pfn(page_list[0]);1152 1153 for (i = 0; i < pinned; i++) {1154 unsigned long this_pfn = page_to_pfn(page_list[i]);1155 u64 csize;1156 1157 if (last_pfn && (this_pfn != last_pfn + 1)) {1158 /* Pin a contiguous chunk of memory */1159 csize = PFN_PHYS(last_pfn - map_pfn + 1);1160 ret = vhost_vdpa_map(v, iotlb, iova, csize,1161 PFN_PHYS(map_pfn),1162 perm, NULL);1163 if (ret) {1164 /*1165 * Unpin the pages that are left unmapped1166 * from this point on in the current1167 * page_list. The remaining outstanding1168 * ones which may stride across several1169 * chunks will be covered in the common1170 * error path subsequently.1171 */1172 unpin_user_pages(&page_list[i],1173 pinned - i);1174 goto out;1175 }1176 1177 map_pfn = this_pfn;1178 iova += csize;1179 nchunks = 0;1180 }1181 1182 last_pfn = this_pfn;1183 }1184 1185 cur_base += PFN_PHYS(pinned);1186 npages -= pinned;1187 }1188 1189 /* Pin the rest chunk */1190 ret = vhost_vdpa_map(v, iotlb, iova, PFN_PHYS(last_pfn - map_pfn + 1),1191 PFN_PHYS(map_pfn), perm, NULL);1192out:1193 if (ret) {1194 if (nchunks) {1195 unsigned long pfn;1196 1197 /*1198 * Unpin the outstanding pages which are yet to be1199 * mapped but haven't due to vdpa_map() or1200 * pin_user_pages() failure.1201 *1202 * Mapped pages are accounted in vdpa_map(), hence1203 * the corresponding unpinning will be handled by1204 * vdpa_unmap().1205 */1206 WARN_ON(!last_pfn);1207 for (pfn = map_pfn; pfn <= last_pfn; pfn++)1208 unpin_user_page(pfn_to_page(pfn));1209 }1210 vhost_vdpa_unmap(v, iotlb, start, size);1211 }1212unlock:1213 mmap_read_unlock(dev->mm);1214free:1215 free_page((unsigned long)page_list);1216 return ret;1217 1218}1219 1220static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,1221 struct vhost_iotlb *iotlb,1222 struct vhost_iotlb_msg *msg)1223{1224 struct vdpa_device *vdpa = v->vdpa;1225 1226 if (msg->iova < v->range.first || !msg->size ||1227 msg->iova > U64_MAX - msg->size + 1 ||1228 msg->iova + msg->size - 1 > v->range.last)1229 return -EINVAL;1230 1231 if (vhost_iotlb_itree_first(iotlb, msg->iova,1232 msg->iova + msg->size - 1))1233 return -EEXIST;1234 1235 if (vdpa->use_va)1236 return vhost_vdpa_va_map(v, iotlb, msg->iova, msg->size,1237 msg->uaddr, msg->perm);1238 1239 return vhost_vdpa_pa_map(v, iotlb, msg->iova, msg->size, msg->uaddr,1240 msg->perm);1241}1242 1243static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid,1244 struct vhost_iotlb_msg *msg)1245{1246 struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);1247 struct vdpa_device *vdpa = v->vdpa;1248 const struct vdpa_config_ops *ops = vdpa->config;1249 struct vhost_iotlb *iotlb = NULL;1250 struct vhost_vdpa_as *as = NULL;1251 int r = 0;1252 1253 mutex_lock(&dev->mutex);1254 1255 r = vhost_dev_check_owner(dev);1256 if (r)1257 goto unlock;1258 1259 if (msg->type == VHOST_IOTLB_UPDATE ||1260 msg->type == VHOST_IOTLB_BATCH_BEGIN) {1261 as = vhost_vdpa_find_alloc_as(v, asid);1262 if (!as) {1263 dev_err(&v->dev, "can't find and alloc asid %d\n",1264 asid);1265 r = -EINVAL;1266 goto unlock;1267 }1268 iotlb = &as->iotlb;1269 } else1270 iotlb = asid_to_iotlb(v, asid);1271 1272 if ((v->in_batch && v->batch_asid != asid) || !iotlb) {1273 if (v->in_batch && v->batch_asid != asid) {1274 dev_info(&v->dev, "batch id %d asid %d\n",1275 v->batch_asid, asid);1276 }1277 if (!iotlb)1278 dev_err(&v->dev, "no iotlb for asid %d\n", asid);1279 r = -EINVAL;1280 goto unlock;1281 }1282 1283 switch (msg->type) {1284 case VHOST_IOTLB_UPDATE:1285 r = vhost_vdpa_process_iotlb_update(v, iotlb, msg);1286 break;1287 case VHOST_IOTLB_INVALIDATE:1288 vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size);1289 break;1290 case VHOST_IOTLB_BATCH_BEGIN:1291 v->batch_asid = asid;1292 v->in_batch = true;1293 break;1294 case VHOST_IOTLB_BATCH_END:1295 if (v->in_batch && ops->set_map)1296 ops->set_map(vdpa, asid, iotlb);1297 v->in_batch = false;1298 break;1299 default:1300 r = -EINVAL;1301 break;1302 }1303unlock:1304 mutex_unlock(&dev->mutex);1305 1306 return r;1307}1308 1309static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb,1310 struct iov_iter *from)1311{1312 struct file *file = iocb->ki_filp;1313 struct vhost_vdpa *v = file->private_data;1314 struct vhost_dev *dev = &v->vdev;1315 1316 return vhost_chr_write_iter(dev, from);1317}1318 1319static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v)1320{1321 struct vdpa_device *vdpa = v->vdpa;1322 const struct vdpa_config_ops *ops = vdpa->config;1323 struct device *dma_dev = vdpa_get_dma_dev(vdpa);1324 int ret;1325 1326 /* Device want to do DMA by itself */1327 if (ops->set_map || ops->dma_map)1328 return 0;1329 1330 if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) {1331 dev_warn_once(&v->dev,1332 "Failed to allocate domain, device is not IOMMU cache coherent capable\n");1333 return -ENOTSUPP;1334 }1335 1336 v->domain = iommu_paging_domain_alloc(dma_dev);1337 if (IS_ERR(v->domain)) {1338 ret = PTR_ERR(v->domain);1339 v->domain = NULL;1340 return ret;1341 }1342 1343 ret = iommu_attach_device(v->domain, dma_dev);1344 if (ret)1345 goto err_attach;1346 1347 return 0;1348 1349err_attach:1350 iommu_domain_free(v->domain);1351 v->domain = NULL;1352 return ret;1353}1354 1355static void vhost_vdpa_free_domain(struct vhost_vdpa *v)1356{1357 struct vdpa_device *vdpa = v->vdpa;1358 struct device *dma_dev = vdpa_get_dma_dev(vdpa);1359 1360 if (v->domain) {1361 iommu_detach_device(v->domain, dma_dev);1362 iommu_domain_free(v->domain);1363 }1364 1365 v->domain = NULL;1366}1367 1368static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v)1369{1370 struct vdpa_iova_range *range = &v->range;1371 struct vdpa_device *vdpa = v->vdpa;1372 const struct vdpa_config_ops *ops = vdpa->config;1373 1374 if (ops->get_iova_range) {1375 *range = ops->get_iova_range(vdpa);1376 } else if (v->domain && v->domain->geometry.force_aperture) {1377 range->first = v->domain->geometry.aperture_start;1378 range->last = v->domain->geometry.aperture_end;1379 } else {1380 range->first = 0;1381 range->last = ULLONG_MAX;1382 }1383}1384 1385static void vhost_vdpa_cleanup(struct vhost_vdpa *v)1386{1387 struct vhost_vdpa_as *as;1388 u32 asid;1389 1390 for (asid = 0; asid < v->vdpa->nas; asid++) {1391 as = asid_to_as(v, asid);1392 if (as)1393 vhost_vdpa_remove_as(v, asid);1394 }1395 1396 vhost_vdpa_free_domain(v);1397 vhost_dev_cleanup(&v->vdev);1398 kfree(v->vdev.vqs);1399 v->vdev.vqs = NULL;1400}1401 1402static int vhost_vdpa_open(struct inode *inode, struct file *filep)1403{1404 struct vhost_vdpa *v;1405 struct vhost_dev *dev;1406 struct vhost_virtqueue **vqs;1407 int r, opened;1408 u32 i, nvqs;1409 1410 v = container_of(inode->i_cdev, struct vhost_vdpa, cdev);1411 1412 opened = atomic_cmpxchg(&v->opened, 0, 1);1413 if (opened)1414 return -EBUSY;1415 1416 nvqs = v->nvqs;1417 r = vhost_vdpa_reset(v);1418 if (r)1419 goto err;1420 1421 vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL);1422 if (!vqs) {1423 r = -ENOMEM;1424 goto err;1425 }1426 1427 dev = &v->vdev;1428 for (i = 0; i < nvqs; i++) {1429 vqs[i] = &v->vqs[i];1430 vqs[i]->handle_kick = handle_vq_kick;1431 vqs[i]->call_ctx.ctx = NULL;1432 }1433 vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false,1434 vhost_vdpa_process_iotlb_msg);1435 1436 r = vhost_vdpa_alloc_domain(v);1437 if (r)1438 goto err_alloc_domain;1439 1440 vhost_vdpa_set_iova_range(v);1441 1442 filep->private_data = v;1443 1444 return 0;1445 1446err_alloc_domain:1447 vhost_vdpa_cleanup(v);1448err:1449 atomic_dec(&v->opened);1450 return r;1451}1452 1453static void vhost_vdpa_clean_irq(struct vhost_vdpa *v)1454{1455 u32 i;1456 1457 for (i = 0; i < v->nvqs; i++)1458 vhost_vdpa_unsetup_vq_irq(v, i);1459}1460 1461static int vhost_vdpa_release(struct inode *inode, struct file *filep)1462{1463 struct vhost_vdpa *v = filep->private_data;1464 struct vhost_dev *d = &v->vdev;1465 1466 mutex_lock(&d->mutex);1467 filep->private_data = NULL;1468 vhost_vdpa_clean_irq(v);1469 vhost_vdpa_reset(v);1470 vhost_dev_stop(&v->vdev);1471 vhost_vdpa_unbind_mm(v);1472 vhost_vdpa_config_put(v);1473 vhost_vdpa_cleanup(v);1474 mutex_unlock(&d->mutex);1475 1476 atomic_dec(&v->opened);1477 complete(&v->completion);1478 1479 return 0;1480}1481 1482#ifdef CONFIG_MMU1483static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)1484{1485 struct vhost_vdpa *v = vmf->vma->vm_file->private_data;1486 struct vdpa_device *vdpa = v->vdpa;1487 const struct vdpa_config_ops *ops = vdpa->config;1488 struct vdpa_notification_area notify;1489 struct vm_area_struct *vma = vmf->vma;1490 u16 index = vma->vm_pgoff;1491 1492 notify = ops->get_vq_notification(vdpa, index);1493 1494 return vmf_insert_pfn(vma, vmf->address & PAGE_MASK, PFN_DOWN(notify.addr));1495}1496 1497static const struct vm_operations_struct vhost_vdpa_vm_ops = {1498 .fault = vhost_vdpa_fault,1499};1500 1501static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)1502{1503 struct vhost_vdpa *v = vma->vm_file->private_data;1504 struct vdpa_device *vdpa = v->vdpa;1505 const struct vdpa_config_ops *ops = vdpa->config;1506 struct vdpa_notification_area notify;1507 unsigned long index = vma->vm_pgoff;1508 1509 if (vma->vm_end - vma->vm_start != PAGE_SIZE)1510 return -EINVAL;1511 if ((vma->vm_flags & VM_SHARED) == 0)1512 return -EINVAL;1513 if (vma->vm_flags & VM_READ)1514 return -EINVAL;1515 if (index > 65535)1516 return -EINVAL;1517 if (!ops->get_vq_notification)1518 return -ENOTSUPP;1519 1520 /* To be safe and easily modelled by userspace, We only1521 * support the doorbell which sits on the page boundary and1522 * does not share the page with other registers.1523 */1524 notify = ops->get_vq_notification(vdpa, index);1525 if (notify.addr & (PAGE_SIZE - 1))1526 return -EINVAL;1527 if (vma->vm_end - vma->vm_start != notify.size)1528 return -ENOTSUPP;1529 1530 vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);1531 vma->vm_ops = &vhost_vdpa_vm_ops;1532 return 0;1533}1534#endif /* CONFIG_MMU */1535 1536static const struct file_operations vhost_vdpa_fops = {1537 .owner = THIS_MODULE,1538 .open = vhost_vdpa_open,1539 .release = vhost_vdpa_release,1540 .write_iter = vhost_vdpa_chr_write_iter,1541 .unlocked_ioctl = vhost_vdpa_unlocked_ioctl,1542#ifdef CONFIG_MMU1543 .mmap = vhost_vdpa_mmap,1544#endif /* CONFIG_MMU */1545 .compat_ioctl = compat_ptr_ioctl,1546};1547 1548static void vhost_vdpa_release_dev(struct device *device)1549{1550 struct vhost_vdpa *v =1551 container_of(device, struct vhost_vdpa, dev);1552 1553 ida_free(&vhost_vdpa_ida, v->minor);1554 kfree(v->vqs);1555 kfree(v);1556}1557 1558static int vhost_vdpa_probe(struct vdpa_device *vdpa)1559{1560 const struct vdpa_config_ops *ops = vdpa->config;1561 struct vhost_vdpa *v;1562 int minor;1563 int i, r;1564 1565 /* We can't support platform IOMMU device with more than 11566 * group or as1567 */1568 if (!ops->set_map && !ops->dma_map &&1569 (vdpa->ngroups > 1 || vdpa->nas > 1))1570 return -EOPNOTSUPP;1571 1572 v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);1573 if (!v)1574 return -ENOMEM;1575 1576 minor = ida_alloc_max(&vhost_vdpa_ida, VHOST_VDPA_DEV_MAX - 1,1577 GFP_KERNEL);1578 if (minor < 0) {1579 kfree(v);1580 return minor;1581 }1582 1583 atomic_set(&v->opened, 0);1584 v->minor = minor;1585 v->vdpa = vdpa;1586 v->nvqs = vdpa->nvqs;1587 v->virtio_id = ops->get_device_id(vdpa);1588 1589 device_initialize(&v->dev);1590 v->dev.release = vhost_vdpa_release_dev;1591 v->dev.parent = &vdpa->dev;1592 v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor);1593 v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue),1594 GFP_KERNEL);1595 if (!v->vqs) {1596 r = -ENOMEM;1597 goto err;1598 }1599 1600 r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor);1601 if (r)1602 goto err;1603 1604 cdev_init(&v->cdev, &vhost_vdpa_fops);1605 v->cdev.owner = THIS_MODULE;1606 1607 r = cdev_device_add(&v->cdev, &v->dev);1608 if (r)1609 goto err;1610 1611 init_completion(&v->completion);1612 vdpa_set_drvdata(vdpa, v);1613 1614 for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++)1615 INIT_HLIST_HEAD(&v->as[i]);1616 1617 return 0;1618 1619err:1620 put_device(&v->dev);1621 return r;1622}1623 1624static void vhost_vdpa_remove(struct vdpa_device *vdpa)1625{1626 struct vhost_vdpa *v = vdpa_get_drvdata(vdpa);1627 int opened;1628 1629 cdev_device_del(&v->cdev, &v->dev);1630 1631 do {1632 opened = atomic_cmpxchg(&v->opened, 0, 1);1633 if (!opened)1634 break;1635 wait_for_completion(&v->completion);1636 } while (1);1637 1638 put_device(&v->dev);1639}1640 1641static struct vdpa_driver vhost_vdpa_driver = {1642 .driver = {1643 .name = "vhost_vdpa",1644 },1645 .probe = vhost_vdpa_probe,1646 .remove = vhost_vdpa_remove,1647};1648 1649static int __init vhost_vdpa_init(void)1650{1651 int r;1652 1653 r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX,1654 "vhost-vdpa");1655 if (r)1656 goto err_alloc_chrdev;1657 1658 r = vdpa_register_driver(&vhost_vdpa_driver);1659 if (r)1660 goto err_vdpa_register_driver;1661 1662 return 0;1663 1664err_vdpa_register_driver:1665 unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);1666err_alloc_chrdev:1667 return r;1668}1669module_init(vhost_vdpa_init);1670 1671static void __exit vhost_vdpa_exit(void)1672{1673 vdpa_unregister_driver(&vhost_vdpa_driver);1674 unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);1675}1676module_exit(vhost_vdpa_exit);1677 1678MODULE_VERSION("0.0.1");1679MODULE_LICENSE("GPL v2");1680MODULE_AUTHOR("Intel Corporation");1681MODULE_DESCRIPTION("vDPA-based vhost backend for virtio");1682