diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/page_track.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/page_track.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/page_track.c b/drivers/gpu/drm/i915/gvt/page_track.c new file mode 100644 index 000000000000..53e2bd79c97d --- /dev/null +++ b/drivers/gpu/drm/i915/gvt/page_track.c @@ -0,0 +1,184 @@ +/* + * Copyright(c) 2011-2017 Intel Corporation. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#include "i915_drv.h" +#include "gvt.h" + +/** + * intel_vgpu_find_page_track - find page track rcord of guest page + * @vgpu: a vGPU + * @gfn: the gfn of guest page + * + * Returns: + * A pointer to struct intel_vgpu_page_track if found, else NULL returned. + */ +struct intel_vgpu_page_track *intel_vgpu_find_page_track( + struct intel_vgpu *vgpu, unsigned long gfn) +{ + return radix_tree_lookup(&vgpu->page_track_tree, gfn); +} + +/** + * intel_vgpu_register_page_track - register a guest page to be tacked + * @vgpu: a vGPU + * @gfn: the gfn of guest page + * + * Returns: + * zero on success, negative error code if failed. + */ +int intel_vgpu_register_page_track(struct intel_vgpu *vgpu, unsigned long gfn, + gvt_page_track_handler_t handler, void *priv) +{ + struct intel_vgpu_page_track *track; + int ret; + + track = intel_vgpu_find_page_track(vgpu, gfn); + if (track) + return -EEXIST; + + track = kzalloc(sizeof(*track), GFP_KERNEL); + if (!track) + return -ENOMEM; + + track->handler = handler; + track->priv_data = priv; + + ret = radix_tree_insert(&vgpu->page_track_tree, gfn, track); + if (ret) { + kfree(track); + return ret; + } + + return 0; +} + +/** + * intel_vgpu_unregister_page_track - unregister the tracked guest page + * @vgpu: a vGPU + * @gfn: the gfn of guest page + * + */ +void intel_vgpu_unregister_page_track(struct intel_vgpu *vgpu, + unsigned long gfn) +{ + struct intel_vgpu_page_track *track; + + track = radix_tree_delete(&vgpu->page_track_tree, gfn); + if (track) { + if (track->tracked) + intel_gvt_hypervisor_disable_page_track(vgpu, gfn); + kfree(track); + } +} + +/** + * intel_vgpu_enable_page_track - set write-protection on guest page + * @vgpu: a vGPU + * @gfn: the gfn of guest page + * + * Returns: + * zero on success, negative error code if failed. + */ +int intel_vgpu_enable_page_track(struct intel_vgpu *vgpu, unsigned long gfn) +{ + struct intel_vgpu_page_track *track; + int ret; + + track = intel_vgpu_find_page_track(vgpu, gfn); + if (!track) + return -ENXIO; + + if (track->tracked) + return 0; + + ret = intel_gvt_hypervisor_enable_page_track(vgpu, gfn); + if (ret) + return ret; + track->tracked = true; + return 0; +} + +/** + * intel_vgpu_enable_page_track - cancel write-protection on guest page + * @vgpu: a vGPU + * @gfn: the gfn of guest page + * + * Returns: + * zero on success, negative error code if failed. + */ +int intel_vgpu_disable_page_track(struct intel_vgpu *vgpu, unsigned long gfn) +{ + struct intel_vgpu_page_track *track; + int ret; + + track = intel_vgpu_find_page_track(vgpu, gfn); + if (!track) + return -ENXIO; + + if (!track->tracked) + return 0; + + ret = intel_gvt_hypervisor_disable_page_track(vgpu, gfn); + if (ret) + return ret; + track->tracked = false; + return 0; +} + +/** + * intel_vgpu_page_track_handler - called when write to write-protected page + * @vgpu: a vGPU + * @gpa: the gpa of this write + * @data: the writed data + * @bytes: the length of this write + * + * Returns: + * zero on success, negative error code if failed. + */ +int intel_vgpu_page_track_handler(struct intel_vgpu *vgpu, u64 gpa, + void *data, unsigned int bytes) +{ + struct intel_gvt *gvt = vgpu->gvt; + struct intel_vgpu_page_track *page_track; + int ret = 0; + + mutex_lock(&gvt->lock); + + page_track = intel_vgpu_find_page_track(vgpu, gpa >> PAGE_SHIFT); + if (!page_track) { + ret = -ENXIO; + goto out; + } + + if (unlikely(vgpu->failsafe)) { + /* Remove write protection to prevent furture traps. */ + intel_vgpu_disable_page_track(vgpu, gpa >> PAGE_SHIFT); + } else { + ret = page_track->handler(page_track, gpa, data, bytes); + if (ret) + gvt_err("guest page write error, gpa %llx\n", gpa); + } + +out: + mutex_unlock(&gvt->lock); + return ret; +} |