2 * Copyright(c) 2011-2017 Intel Corporation. All rights reserved.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * intel_vgpu_find_page_track - find page track rcord of guest page
29 * @gfn: the gfn of guest page
32 * A pointer to struct intel_vgpu_page_track if found, else NULL returned.
34 struct intel_vgpu_page_track *intel_vgpu_find_page_track(
35 struct intel_vgpu *vgpu, unsigned long gfn)
37 return radix_tree_lookup(&vgpu->page_track_tree, gfn);
41 * intel_vgpu_register_page_track - register a guest page to be tacked
43 * @gfn: the gfn of guest page
44 * @handler: page track handler
45 * @priv: tracker private
48 * zero on success, negative error code if failed.
50 int intel_vgpu_register_page_track(struct intel_vgpu *vgpu, unsigned long gfn,
51 gvt_page_track_handler_t handler, void *priv)
53 struct intel_vgpu_page_track *track;
56 track = intel_vgpu_find_page_track(vgpu, gfn);
60 track = kzalloc(sizeof(*track), GFP_KERNEL);
64 track->handler = handler;
65 track->priv_data = priv;
67 ret = radix_tree_insert(&vgpu->page_track_tree, gfn, track);
77 * intel_vgpu_unregister_page_track - unregister the tracked guest page
79 * @gfn: the gfn of guest page
82 void intel_vgpu_unregister_page_track(struct intel_vgpu *vgpu,
85 struct intel_vgpu_page_track *track;
87 track = radix_tree_delete(&vgpu->page_track_tree, gfn);
90 intel_gvt_hypervisor_disable_page_track(vgpu, gfn);
96 * intel_vgpu_enable_page_track - set write-protection on guest page
98 * @gfn: the gfn of guest page
101 * zero on success, negative error code if failed.
103 int intel_vgpu_enable_page_track(struct intel_vgpu *vgpu, unsigned long gfn)
105 struct intel_vgpu_page_track *track;
108 track = intel_vgpu_find_page_track(vgpu, gfn);
115 ret = intel_gvt_hypervisor_enable_page_track(vgpu, gfn);
118 track->tracked = true;
123 * intel_vgpu_enable_page_track - cancel write-protection on guest page
125 * @gfn: the gfn of guest page
128 * zero on success, negative error code if failed.
130 int intel_vgpu_disable_page_track(struct intel_vgpu *vgpu, unsigned long gfn)
132 struct intel_vgpu_page_track *track;
135 track = intel_vgpu_find_page_track(vgpu, gfn);
142 ret = intel_gvt_hypervisor_disable_page_track(vgpu, gfn);
145 track->tracked = false;
150 * intel_vgpu_page_track_handler - called when write to write-protected page
152 * @gpa: the gpa of this write
153 * @data: the writed data
154 * @bytes: the length of this write
157 * zero on success, negative error code if failed.
159 int intel_vgpu_page_track_handler(struct intel_vgpu *vgpu, u64 gpa,
160 void *data, unsigned int bytes)
162 struct intel_vgpu_page_track *page_track;
165 mutex_lock(&vgpu->vgpu_lock);
167 page_track = intel_vgpu_find_page_track(vgpu, gpa >> PAGE_SHIFT);
173 if (unlikely(vgpu->failsafe)) {
174 /* Remove write protection to prevent furture traps. */
175 intel_vgpu_disable_page_track(vgpu, gpa >> PAGE_SHIFT);
177 ret = page_track->handler(page_track, gpa, data, bytes);
179 gvt_err("guest page write error, gpa %llx\n", gpa);
183 mutex_unlock(&vgpu->vgpu_lock);