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/*
* 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
* @handler: page track handler
* @priv: tracker private
*
* 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_vgpu_page_track *page_track;
int ret = 0;
mutex_lock(&vgpu->vgpu_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(&vgpu->vgpu_lock);
return ret;
}
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