From patchwork Wed Jun 1 01:20:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 12866276 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C568C4332F for ; Wed, 1 Jun 2022 01:20:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348968AbiFABUh (ORCPT ); Tue, 31 May 2022 21:20:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348962AbiFABUf (ORCPT ); Tue, 31 May 2022 21:20:35 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7E51F95A3A for ; Tue, 31 May 2022 18:20:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1654046432; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=qAzOFD7ObxR7RBhrEOE65Iye7i1jdPXqMYZvPrmJxC8=; b=WVtgajrKs69Xi2M3KwS3knzzPqKXAlmaXIXsmxcYZmn4y3hSeWdkcCQTwhCDCGeMI6J+X1 IROGBJaKFqVbJ4/U9SbGYFrQT8ZQ2J0bdbCrVEf+b6G6lA0oclOLr8DL7k7h6z3RqUFFhl srsI9c468bBB37SKKdRcywsAPHM2bag= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-195-1Yq-QPCgO4WwfOJdBWCj-g-1; Tue, 31 May 2022 21:20:28 -0400 X-MC-Unique: 1Yq-QPCgO4WwfOJdBWCj-g-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 32E6829AB40F; Wed, 1 Jun 2022 01:20:28 +0000 (UTC) Received: from server.redhat.com (ovpn-13-32.pek2.redhat.com [10.72.13.32]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DF327492C3B; Wed, 1 Jun 2022 01:20:23 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2] vdpa: Do not count the pages that were already pinned in the vhost-vDPA Date: Wed, 1 Jun 2022 09:20:19 +0800 Message-Id: <20220601012019.1102186-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-State: RFC We count pinned_vm as follow in vhost-vDPA lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { ret = -ENOMEM; goto unlock; } This means if we have two vDPA devices for the same VM the pages would be counted twice So we add a tree to save the page that counted and we will not count it again. Signed-off-by: Cindy Lu --- drivers/vhost/vdpa.c | 542 +++++++++++++++++++++++++++++++++++++++++- drivers/vhost/vhost.h | 1 + 2 files changed, 539 insertions(+), 4 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 05f5fd2af58f..1b0da0735efd 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -24,6 +24,10 @@ #include #include "vhost.h" +#include +#include +#include +#include enum { VHOST_VDPA_BACKEND_FEATURES = @@ -506,12 +510,478 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, return r; } +struct vdpa_tree_node { + struct interval_tree_node tree_node; + int ref; +}; +struct vdpa_link_node { + struct vdpa_tree_node *vdpa_node; + struct vdpa_link_node *next; + u64 node_start; + u64 node_last; +}; + +int vhost_vdpa_add_range_ctx(struct rb_root_cached *root, u64 start, u64 last, + int ref) +{ + struct interval_tree_node *new_node; + struct vdpa_tree_node *vdpa_node; + + if (last < start) + return -EFAULT; + + /* If the range being mapped is [0, ULONG_MAX], split it into two entries + * otherwise its size would overflow u64. + */ + if (start == 0 && last == ULONG_MAX) { + u64 mid = last / 2; + + vhost_vdpa_add_range_ctx(root, start, mid, ref); + start = mid + 1; + } + vdpa_node = kmalloc(sizeof(struct vdpa_tree_node), GFP_ATOMIC); + + new_node = &vdpa_node->tree_node; + if (!new_node) + return -ENOMEM; + + new_node->start = start; + new_node->last = last; + vdpa_node->ref = ref; + + interval_tree_insert(new_node, root); + + return 0; +} + +u64 vhost_vdpa_range_ref_add(struct rb_root_cached *root, + struct vdpa_link_node *link_head, int node_number, + u64 start, u64 last) +{ + int i = 0; + u64 size = 0; + int new_ref; + u64 node_start; + u64 node_last; + u64 range_start; + u64 range_last; + int range_size; + struct vdpa_link_node *link_node; + struct vdpa_tree_node *vdpa_node = NULL; + struct interval_tree_node *node = NULL; + + if (node_number == 0) { + vhost_vdpa_add_range_ctx(root, start, last, 1); + + size = last - start + 1; + return size; + } + + link_node = link_head; + range_start = start; + range_last = last; + range_size = range_start - range_last; + for (i = 0; i < node_number; i++) { + vdpa_node = link_node->vdpa_node; + link_node = link_node->next; + node = &vdpa_node->tree_node; + new_ref = vdpa_node->ref; + node_start = node->start; + node_last = node->last; + + if (range_start == node_start) { + if (node_last < range_last) { + /* range_start= node->start--- node->last--range_last*/ + vhost_vdpa_add_range_ctx(root, node_start, + node_last, + new_ref + 1); + /*count the next range */ + } else if (node_last > range_last) { + /* range_start= node->start --- last -- node->last*/ + vhost_vdpa_add_range_ctx(root, node_start, + range_last, + new_ref + 1); + vhost_vdpa_add_range_ctx(root, range_last + 1, + node_last, new_ref); + } else { + vhost_vdpa_add_range_ctx(root, node_start, + node_last, + new_ref + 1); + } + } else if (node_start < range_start) { + if (range_last < node_last) { + /* node->start--- start--- last--- node->last*/ + /* should the end rang*/ + + vhost_vdpa_add_range_ctx(root, node_start, + range_start - 1, + new_ref); + vhost_vdpa_add_range_ctx(root, range_start, + range_last, + new_ref + 1); + vhost_vdpa_add_range_ctx(root, range_last + 1, + node_last, new_ref); + + } else if (range_last > node_last) { + /* node->start--- start--- node->last-- last*/ + + vhost_vdpa_add_range_ctx(root, node_start, + range_start - 1, + new_ref); + vhost_vdpa_add_range_ctx(root, range_start, + node_last, + new_ref + 1); + } else { + /* node->start--- start--- node->last= last*/ + vhost_vdpa_add_range_ctx(root, node_start, + range_start - 1, + new_ref); + vhost_vdpa_add_range_ctx(root, range_start, + node_last, + new_ref + 1); + /* should the end rang*/ + } + } else { + if (node_last < range_last) { + /* range_start --- node->start --- node->last ----last */ + + vhost_vdpa_add_range_ctx(root, range_start, + node_start - 1, 1); + vhost_vdpa_add_range_ctx(root, node_start, + node_last, + new_ref + 1); + size += ((node_start - 1) - range_start) + 1; + } else if (node_last > range_last) { + /* range_start--- node->start --- last -- node->last */ + vhost_vdpa_add_range_ctx(root, range_start, + node_start - 1, 1); + vhost_vdpa_add_range_ctx(root, node_start, + range_last, + new_ref + 1); + vhost_vdpa_add_range_ctx(root, range_last + 1, + node_last, new_ref); + size += ((node_start - 1) - range_start) + 1; + + /* should the end rang*/ + } else { + /* range_start--- node->start --- last = node->last */ + vhost_vdpa_add_range_ctx(root, range_start, + node_start - 1, 1); + vhost_vdpa_add_range_ctx(root, node_start, + node_last, + new_ref + 1); + size += ((node_start - 1) - range_start) + 1; + + /* should the end rang*/ + } + } + /* work in next node*/ + range_start = node_last + 1; + if (range_start > range_last) + break; + } + + range_size = range_last - range_start; + + /* last round and still some range*/ + + if ((range_size >= 0) && (range_start >= node_last) && + (node_number == i + 1)) { + vhost_vdpa_add_range_ctx(root, range_start, range_last, 1); + size = size + (range_last - range_start) + 1; + } else if ((range_size == -1) && (node_number == i + 1)) { + return size; + } else { + printk(KERN_WARNING, + "%s %d FAIL start %lld last %lld node->start %lld node->last %lld i %d", + __func__, __LINE__, range_start, range_last, node_start, + node_last, i); + } + + return size; +} + +u64 vhost_vdpa_range_ref_del(struct rb_root_cached *root, + struct vdpa_link_node *link_head, int node_number, + u64 start, u64 last) +{ + int i = 0; + u64 size = 0; + int new_ref; + u64 node_start; + u64 node_last; + u64 range_start; + u64 range_last; + int range_size; + struct vdpa_link_node *link_node; + struct vdpa_tree_node *vdpa_node = NULL; + struct interval_tree_node *node = NULL; + + if (node_number == 0) + return 0; + + link_node = link_head; + range_start = start; + range_last = last; + + for (i = 0; i < node_number; i++) { + vdpa_node = link_node->vdpa_node; + link_node = link_node->next; + node = &vdpa_node->tree_node; + new_ref = vdpa_node->ref; + node_start = node->start; + node_last = node->last; + + if (range_start == node_start) { + if (node_last < range_last) { + /* range_start =node->start --- node->last ----last*/ + if (new_ref > 1) { + vhost_vdpa_add_range_ctx(root, + node_start, + node_last, + new_ref - 1); + /*count the next range */ + } else { + /* if the ref =0, do not need add it back, count size*/ + size += (node_last - node_start) + 1; + } + + } else if (node_last > range_last) { + /* range_start= node->start --- last -- node->last*/ + + if (new_ref > 1) { + vhost_vdpa_add_range_ctx(root, + node_start, + range_last, + new_ref - 1); + } else { + size += (range_last - node_start) + 1; + } + vhost_vdpa_add_range_ctx(root, range_last + 1, + node_last, new_ref); + } else { + /* range_start= node->start --- last = node->last*/ + + if (new_ref > 1) { + vhost_vdpa_add_range_ctx(root, + node_start, + range_last, + new_ref - 1); + } else { + size += (range_last - node_start) + 1; + } + /* should be the end */ + } + } else if (node_start < range_start) { + if (range_last < node_last) { + /* node->start--- start--- last--- node->last*/ + /* should the end rang*/ + vhost_vdpa_add_range_ctx(root, node_start, + range_start - 1, + new_ref); + if (new_ref > 1) { + vhost_vdpa_add_range_ctx(root, + range_start, + range_last, + new_ref - 1); + } else { + size += (range_last - range_start) + 1; + } + vhost_vdpa_add_range_ctx(root, range_last + 1, + node_last, new_ref); + + } else if (range_last > node_last) { + /* node->start--- start--- node->last--- last*/ + + vhost_vdpa_add_range_ctx(root, node_start, + range_start - 1, + new_ref); + if (new_ref > 1) { + vhost_vdpa_add_range_ctx(root, + range_start, + node_last, + new_ref - 1); + } else { + size += (node_last - range_start) + 1; + } + } else { + /* node->start--- start--- node->last= last*/ + vhost_vdpa_add_range_ctx(root, node_start, + range_start - 1, + new_ref); + if (new_ref > 1) { + vhost_vdpa_add_range_ctx(root, + range_start, + range_last, + new_ref - 1); + } else { + size += (range_last - range_start) + 1; + } + /* should be the end */ + } + } else { + /* some range not in the node, error*/ + printk(KERN_WARNING, + "%s %d FAIL start %lld last %lld node->start %lld node->last %lld new_ref %d", + __func__, __LINE__, range_start, range_last, + node_start, node_last, new_ref); + } + + range_start = node_last + 1; + if (range_start > range_last) + break; + } + + range_size = range_last - range_start; + + /* last round and still some range*/ + + if ((range_size > 0) && (node_number == i + 1)) { + printk(KERN_WARNING, + "%s %d FAIL start %lld last %lld node->start %lld node->last %lld range_size %d", + __func__, __LINE__, range_start, range_last, node_start, + node_last, range_size); + } + return size; +} + +struct vdpa_link_node *vhost_vdpa_merge_list(struct vdpa_link_node *list1, + struct vdpa_link_node *list2) +{ + struct vdpa_link_node dummy_head; + struct vdpa_link_node *ptr = &dummy_head; + + while (list1 && list2) { + if (list1->node_start < list2->node_start) { + ptr->next = list1; + list1 = list1->next; + } else { + ptr->next = list2; + list2 = list2->next; + } + ptr = ptr->next; + } + if (list1) + ptr->next = list1; + else + ptr->next = list2; + + return dummy_head.next; +} + +struct vdpa_link_node *vhost_vdpa_get_mid(struct vdpa_link_node *head) +{ + struct vdpa_link_node *mid_prev = NULL; + struct vdpa_link_node *mid; + + while (head && head->next) { + mid_prev = (mid_prev == NULL) ? head : mid_prev->next; + head = head->next->next; + } + mid = mid_prev->next; + mid_prev->next = NULL; + return mid; +} +struct vdpa_link_node *vhost_vdpa_sort_list(struct vdpa_link_node *head) +{ + struct vdpa_link_node *mid; + struct vdpa_link_node *left; + struct vdpa_link_node *right; + + if (!head || !head->next) + return head; + + mid = vhost_vdpa_get_mid(head); + left = vhost_vdpa_sort_list(head); + right = vhost_vdpa_sort_list(mid); + return vhost_vdpa_merge_list(left, right); +} + +u64 vhost_vdpa_range_ops(struct rb_root_cached *root, u64 start, u64 last, + bool ops) +{ + struct interval_tree_node *node = NULL; + struct vdpa_tree_node *vdpa_node; + int node_number = 0; + int i = 0; + u64 size = 0; + struct vdpa_link_node dummy_head = { 0 }; + struct vdpa_link_node *link_node; + struct vdpa_link_node *link_head_tmp; + struct vdpa_link_node *pre_link_node; + + pre_link_node = &dummy_head; + /*search the rang overlaped, and del from the tree*/ + for (node = interval_tree_iter_first(root, start, last); node; + node = interval_tree_iter_next(node, start, last)) { + link_node = kmalloc(sizeof(struct vdpa_link_node), GFP_ATOMIC); + if (link_node == NULL) { + goto out; + } + vdpa_node = + container_of(node, struct vdpa_tree_node, tree_node); + link_node->vdpa_node = vdpa_node; + link_node->node_start = node->start; + link_node->node_last = node->last; + + pre_link_node->next = link_node; + pre_link_node = link_node; + pre_link_node->next = NULL; + + node_number++; + + interval_tree_remove(node, root); + } + /* sorting the node */ + link_head_tmp = vhost_vdpa_sort_list(dummy_head.next); + + /* these link node are have overlap with range, check the ref and add back to the tree*/ + if (ops == true) { + size = vhost_vdpa_range_ref_add(root, link_head_tmp, + node_number, start, last); + } else { + size = vhost_vdpa_range_ref_del(root, link_head_tmp, + node_number, start, last); + } +out: + pre_link_node = link_head_tmp; + + for (i = 0; i < node_number; i++) { + vdpa_node = pre_link_node->vdpa_node; + link_node = pre_link_node->next; + kfree(vdpa_node); + kfree(pre_link_node); + pre_link_node = link_node; + } + return size; +} +u64 vhost_vdpa_search_range_add(struct rb_root_cached *root, u64 start, + u64 last) +{ + u64 size; + + size = vhost_vdpa_range_ops(root, start, last, true); + + return size; +} + +u64 vhost_vdpa_search_range_del(struct rb_root_cached *root, u64 start, + u64 last) +{ + u64 size; + + size = vhost_vdpa_range_ops(root, start, last, false); + + return size; +} + static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, u64 start, u64 last) { struct vhost_dev *dev = &v->vdev; struct vhost_iotlb *iotlb = dev->iotlb; struct vhost_iotlb_map *map; struct page *page; + u64 size; unsigned long pfn, pinned; while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { @@ -523,7 +993,11 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, u64 start, u64 last) set_page_dirty_lock(page); unpin_user_page(page); } - atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm); + + size = vhost_vdpa_search_range_del(dev->vdpa_mem_tree, + map->start, + map->start + map->size - 1); + atomic64_sub(PFN_DOWN(size), &dev->mm->pinned_vm); vhost_iotlb_map_free(iotlb, map); } } @@ -591,6 +1065,7 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, u64 iova, struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; int r = 0; + u64 size_count; r = vhost_iotlb_add_range_ctx(dev->iotlb, iova, iova + size - 1, pa, perm, opaque); @@ -610,9 +1085,11 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, u64 iova, vhost_iotlb_del_range(dev->iotlb, iova, iova + size - 1); return r; } - - if (!vdpa->use_va) - atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm); + if (!vdpa->use_va) { + size_count = vhost_vdpa_search_range_add(dev->vdpa_mem_tree, + iova, iova + size - 1); + atomic64_add(PFN_DOWN(size_count), &dev->mm->pinned_vm); + } return 0; } @@ -946,6 +1423,58 @@ static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v) } } +struct root_for_vdpa_node { + struct hlist_node hlist; + struct rb_root_cached vdpa_mem_tree; + pid_t pid_using; +}; +static DECLARE_HASHTABLE(root_for_vdpa_node_list, 8); +int status_for_vdpa_tree = 0; + +struct root_for_vdpa_node *vhost_vdpa_get_mem_tree(struct task_struct *task) +{ + struct root_for_vdpa_node *root_get_tmp = NULL; + pid_t pid_using = task_pid_nr(task); + + /* No hased table, init one */ + if (status_for_vdpa_tree == 0) { + hash_init(root_for_vdpa_node_list); + status_for_vdpa_tree = 1; + } + + hash_for_each_possible (root_for_vdpa_node_list, root_get_tmp, hlist, + pid_using) { + if (root_get_tmp->pid_using == pid_using) + return root_get_tmp; + } + + root_get_tmp = kmalloc(sizeof(*root_get_tmp), GFP_KERNEL); + root_get_tmp->pid_using = pid_using; + + root_get_tmp->vdpa_mem_tree = RB_ROOT_CACHED; + + hash_add(root_for_vdpa_node_list, &root_get_tmp->hlist, + root_get_tmp->pid_using); + + return root_get_tmp; +} + +void vhost_vdpa_relase_mem_tree(struct task_struct *task) +{ + struct root_for_vdpa_node *root_get_tmp = NULL; + pid_t pid_using = task_pid_nr(task); + + /* No hased table, init one */ + hash_for_each_possible (root_for_vdpa_node_list, root_get_tmp, hlist, + pid_using) { + if (root_get_tmp->pid_using == pid_using) + kfree(root_get_tmp); + return; + } + + return; +} + static int vhost_vdpa_open(struct inode *inode, struct file *filep) { struct vhost_vdpa *v; @@ -991,10 +1520,13 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep) vhost_vdpa_set_iova_range(v); filep->private_data = v; + struct root_for_vdpa_node *tmp = vhost_vdpa_get_mem_tree(current); + dev->vdpa_mem_tree = &tmp->vdpa_mem_tree; return 0; err_init_iotlb: + vhost_vdpa_relase_mem_tree(current); vhost_dev_cleanup(&v->vdev); kfree(vqs); err: @@ -1016,6 +1548,8 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep) struct vhost_dev *d = &v->vdev; mutex_lock(&d->mutex); + vhost_vdpa_relase_mem_tree(current); + filep->private_data = NULL; vhost_vdpa_clean_irq(v); vhost_vdpa_reset(v); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 638bb640d6b4..d1c662eb4f26 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -161,6 +161,7 @@ struct vhost_dev { int byte_weight; u64 kcov_handle; bool use_worker; + struct rb_root_cached *vdpa_mem_tree; int (*msg_handler)(struct vhost_dev *dev, struct vhost_iotlb_msg *msg); };