mirror of https://gitee.com/openkylin/linux.git
drm/i915/gvt: Factor intel_vgpu_page_track
As the data structure of "intel_vgpu_guest_page" will become much heavier in future, it's better to factor out the guest memory page track mechnisim as early as possible. Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
This commit is contained in:
Zhi Wang
Zhenyu Wang
parent
f52c380a48
commit
7d1e5cdf01
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@ -494,7 +494,7 @@ static inline int ppgtt_spt_get_entry(
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return -EINVAL;
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ret = ops->get_entry(page_table, e, index, guest,
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spt->guest_page.gfn << GTT_PAGE_SHIFT,
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spt->guest_page.track.gfn << GTT_PAGE_SHIFT,
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spt->vgpu);
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if (ret)
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return ret;
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@ -516,7 +516,7 @@ static inline int ppgtt_spt_set_entry(
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return -EINVAL;
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return ops->set_entry(page_table, e, index, guest,
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spt->guest_page.gfn << GTT_PAGE_SHIFT,
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spt->guest_page.track.gfn << GTT_PAGE_SHIFT,
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spt->vgpu);
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}
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@ -537,84 +537,99 @@ static inline int ppgtt_spt_set_entry(
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spt->shadow_page.type, e, index, false)
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/**
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* intel_vgpu_init_guest_page - init a guest page data structure
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* intel_vgpu_init_page_track - init a page track data structure
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* @vgpu: a vGPU
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* @p: a guest page data structure
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* @t: a page track data structure
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* @gfn: guest memory page frame number
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* @handler: function will be called when target guest memory page has
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* @handler: the function will be called when target guest memory page has
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* been modified.
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*
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* This function is called when user wants to track a guest memory page.
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* This function is called when a user wants to prepare a page track data
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* structure to track a guest memory page.
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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int intel_vgpu_init_guest_page(struct intel_vgpu *vgpu,
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int intel_vgpu_init_page_track(struct intel_vgpu *vgpu,
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struct intel_vgpu_page_track *t,
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unsigned long gfn,
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int (*handler)(void *, u64, void *, int),
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void *data)
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{
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INIT_HLIST_NODE(&t->node);
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t->tracked = false;
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t->gfn = gfn;
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t->handler = handler;
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t->data = data;
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hash_add(vgpu->gtt.tracked_guest_page_hash_table, &t->node, t->gfn);
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return 0;
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}
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/**
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* intel_vgpu_clean_page_track - release a page track data structure
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* @vgpu: a vGPU
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* @t: a page track data structure
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*
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* This function is called before a user frees a page track data structure.
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*/
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void intel_vgpu_clean_page_track(struct intel_vgpu *vgpu,
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struct intel_vgpu_page_track *t)
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{
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if (!hlist_unhashed(&t->node))
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hash_del(&t->node);
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if (t->tracked)
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intel_gvt_hypervisor_disable_page_track(vgpu, t);
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}
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/**
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* intel_vgpu_find_tracked_page - find a tracked guest page
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* @vgpu: a vGPU
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* @gfn: guest memory page frame number
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*
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* This function is called when the emulation layer wants to figure out if a
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* trapped GFN is a tracked guest page.
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*
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* Returns:
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* Pointer to page track data structure, NULL if not found.
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*/
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struct intel_vgpu_page_track *intel_vgpu_find_tracked_page(
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struct intel_vgpu *vgpu, unsigned long gfn)
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{
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struct intel_vgpu_page_track *t;
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hash_for_each_possible(vgpu->gtt.tracked_guest_page_hash_table,
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t, node, gfn) {
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if (t->gfn == gfn)
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return t;
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}
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return NULL;
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}
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static int init_guest_page(struct intel_vgpu *vgpu,
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struct intel_vgpu_guest_page *p,
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unsigned long gfn,
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int (*handler)(void *, u64, void *, int),
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void *data)
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{
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INIT_HLIST_NODE(&p->node);
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p->writeprotection = false;
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p->gfn = gfn;
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p->handler = handler;
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p->data = data;
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p->oos_page = NULL;
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p->write_cnt = 0;
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hash_add(vgpu->gtt.guest_page_hash_table, &p->node, p->gfn);
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return 0;
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return intel_vgpu_init_page_track(vgpu, &p->track, gfn, handler, data);
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}
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static int detach_oos_page(struct intel_vgpu *vgpu,
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struct intel_vgpu_oos_page *oos_page);
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/**
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* intel_vgpu_clean_guest_page - release the resource owned by guest page data
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* structure
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* @vgpu: a vGPU
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* @p: a tracked guest page
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*
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* This function is called when user tries to stop tracking a guest memory
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* page.
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*/
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void intel_vgpu_clean_guest_page(struct intel_vgpu *vgpu,
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static void clean_guest_page(struct intel_vgpu *vgpu,
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struct intel_vgpu_guest_page *p)
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{
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if (!hlist_unhashed(&p->node))
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hash_del(&p->node);
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if (p->oos_page)
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detach_oos_page(vgpu, p->oos_page);
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if (p->writeprotection)
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intel_gvt_hypervisor_unset_wp_page(vgpu, p);
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}
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/**
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* intel_vgpu_find_guest_page - find a guest page data structure by GFN.
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* @vgpu: a vGPU
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* @gfn: guest memory page frame number
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*
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* This function is called when emulation logic wants to know if a trapped GFN
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* is a tracked guest page.
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*
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* Returns:
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* Pointer to guest page data structure, NULL if failed.
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*/
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struct intel_vgpu_guest_page *intel_vgpu_find_guest_page(
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struct intel_vgpu *vgpu, unsigned long gfn)
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{
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struct intel_vgpu_guest_page *p;
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hash_for_each_possible(vgpu->gtt.guest_page_hash_table,
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p, node, gfn) {
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if (p->gfn == gfn)
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return p;
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}
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return NULL;
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intel_vgpu_clean_page_track(vgpu, &p->track);
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}
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static inline int init_shadow_page(struct intel_vgpu *vgpu,
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@ -664,6 +679,9 @@ static inline struct intel_vgpu_shadow_page *find_shadow_page(
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return NULL;
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}
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#define page_track_to_guest_page(ptr) \
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container_of(ptr, struct intel_vgpu_guest_page, track)
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#define guest_page_to_ppgtt_spt(ptr) \
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container_of(ptr, struct intel_vgpu_ppgtt_spt, guest_page)
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@ -697,7 +715,7 @@ static void ppgtt_free_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
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trace_spt_free(spt->vgpu->id, spt, spt->shadow_page.type);
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clean_shadow_page(spt->vgpu, &spt->shadow_page);
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intel_vgpu_clean_guest_page(spt->vgpu, &spt->guest_page);
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clean_guest_page(spt->vgpu, &spt->guest_page);
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list_del_init(&spt->post_shadow_list);
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free_spt(spt);
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@ -713,22 +731,24 @@ static void ppgtt_free_all_shadow_page(struct intel_vgpu *vgpu)
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ppgtt_free_shadow_page(shadow_page_to_ppgtt_spt(sp));
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}
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static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
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static int ppgtt_handle_guest_write_page_table_bytes(
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struct intel_vgpu_guest_page *gpt,
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u64 pa, void *p_data, int bytes);
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static int ppgtt_write_protection_handler(void *gp, u64 pa,
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static int ppgtt_write_protection_handler(void *data, u64 pa,
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void *p_data, int bytes)
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{
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struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp;
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struct intel_vgpu_page_track *t = data;
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struct intel_vgpu_guest_page *p = page_track_to_guest_page(t);
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int ret;
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if (bytes != 4 && bytes != 8)
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return -EINVAL;
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if (!gpt->writeprotection)
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if (!t->tracked)
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return -EINVAL;
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ret = ppgtt_handle_guest_write_page_table_bytes(gp,
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ret = ppgtt_handle_guest_write_page_table_bytes(p,
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pa, p_data, bytes);
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if (ret)
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return ret;
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@ -768,7 +788,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_alloc_shadow_page(
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goto err;
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}
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ret = intel_vgpu_init_guest_page(vgpu, &spt->guest_page,
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ret = init_guest_page(vgpu, &spt->guest_page,
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gfn, ppgtt_write_protection_handler, NULL);
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if (ret) {
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gvt_vgpu_err("fail to initialize guest page for spt\n");
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@ -856,7 +876,7 @@ static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
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int v = atomic_read(&spt->refcount);
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trace_spt_change(spt->vgpu->id, "die", spt,
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spt->guest_page.gfn, spt->shadow_page.type);
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spt->guest_page.track.gfn, spt->shadow_page.type);
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trace_spt_refcount(spt->vgpu->id, "dec", spt, v, (v - 1));
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@ -878,7 +898,7 @@ static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
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}
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release:
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trace_spt_change(spt->vgpu->id, "release", spt,
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spt->guest_page.gfn, spt->shadow_page.type);
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spt->guest_page.track.gfn, spt->shadow_page.type);
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ppgtt_free_shadow_page(spt);
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return 0;
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fail:
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@ -895,6 +915,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
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struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
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struct intel_vgpu_ppgtt_spt *s = NULL;
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struct intel_vgpu_guest_page *g;
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struct intel_vgpu_page_track *t;
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int ret;
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if (WARN_ON(!gtt_type_is_pt(get_next_pt_type(we->type)))) {
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@ -902,8 +923,9 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
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goto fail;
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}
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g = intel_vgpu_find_guest_page(vgpu, ops->get_pfn(we));
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if (g) {
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t = intel_vgpu_find_tracked_page(vgpu, ops->get_pfn(we));
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if (t) {
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g = page_track_to_guest_page(t);
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s = guest_page_to_ppgtt_spt(g);
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ppgtt_get_shadow_page(s);
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} else {
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@ -915,7 +937,8 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
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goto fail;
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}
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ret = intel_gvt_hypervisor_set_wp_page(vgpu, &s->guest_page);
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ret = intel_gvt_hypervisor_enable_page_track(vgpu,
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&s->guest_page.track);
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if (ret)
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goto fail;
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@ -923,7 +946,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
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if (ret)
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goto fail;
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trace_spt_change(vgpu->id, "new", s, s->guest_page.gfn,
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trace_spt_change(vgpu->id, "new", s, s->guest_page.track.gfn,
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s->shadow_page.type);
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}
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return s;
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@ -953,7 +976,7 @@ static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
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int ret;
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trace_spt_change(spt->vgpu->id, "born", spt,
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spt->guest_page.gfn, spt->shadow_page.type);
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spt->guest_page.track.gfn, spt->shadow_page.type);
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if (gtt_type_is_pte_pt(spt->shadow_page.type)) {
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for_each_present_guest_entry(spt, &ge, i) {
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@ -1082,7 +1105,7 @@ static int sync_oos_page(struct intel_vgpu *vgpu,
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index++) {
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ops->get_entry(oos_page->mem, &old, index, false, 0, vgpu);
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ops->get_entry(NULL, &new, index, true,
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oos_page->guest_page->gfn << PAGE_SHIFT, vgpu);
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oos_page->guest_page->track.gfn << PAGE_SHIFT, vgpu);
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if (old.val64 == new.val64
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&& !test_and_clear_bit(index, spt->post_shadow_bitmap))
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@ -1132,8 +1155,9 @@ static int attach_oos_page(struct intel_vgpu *vgpu,
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struct intel_gvt *gvt = vgpu->gvt;
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int ret;
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ret = intel_gvt_hypervisor_read_gpa(vgpu, gpt->gfn << GTT_PAGE_SHIFT,
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oos_page->mem, GTT_PAGE_SIZE);
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ret = intel_gvt_hypervisor_read_gpa(vgpu,
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gpt->track.gfn << GTT_PAGE_SHIFT,
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oos_page->mem, GTT_PAGE_SIZE);
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if (ret)
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return ret;
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@ -1152,7 +1176,7 @@ static int ppgtt_set_guest_page_sync(struct intel_vgpu *vgpu,
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{
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int ret;
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ret = intel_gvt_hypervisor_set_wp_page(vgpu, gpt);
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ret = intel_gvt_hypervisor_enable_page_track(vgpu, &gpt->track);
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if (ret)
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return ret;
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@ -1200,7 +1224,7 @@ static int ppgtt_set_guest_page_oos(struct intel_vgpu *vgpu,
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gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type);
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list_add_tail(&oos_page->vm_list, &vgpu->gtt.oos_page_list_head);
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return intel_gvt_hypervisor_unset_wp_page(vgpu, gpt);
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return intel_gvt_hypervisor_disable_page_track(vgpu, &gpt->track);
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}
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/**
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@ -1335,10 +1359,10 @@ int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu)
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return 0;
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}
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static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
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static int ppgtt_handle_guest_write_page_table_bytes(
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struct intel_vgpu_guest_page *gpt,
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u64 pa, void *p_data, int bytes)
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{
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struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp;
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struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
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struct intel_vgpu *vgpu = spt->vgpu;
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struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
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@ -2032,7 +2056,7 @@ int intel_vgpu_init_gtt(struct intel_vgpu *vgpu)
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struct intel_vgpu_gtt *gtt = &vgpu->gtt;
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struct intel_vgpu_mm *ggtt_mm;
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hash_init(gtt->guest_page_hash_table);
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hash_init(gtt->tracked_guest_page_hash_table);
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hash_init(gtt->shadow_page_hash_table);
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INIT_LIST_HEAD(>t->mm_list_head);
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@ -193,18 +193,16 @@ struct intel_vgpu_scratch_pt {
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unsigned long page_mfn;
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};
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struct intel_vgpu_gtt {
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struct intel_vgpu_mm *ggtt_mm;
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unsigned long active_ppgtt_mm_bitmap;
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struct list_head mm_list_head;
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DECLARE_HASHTABLE(shadow_page_hash_table, INTEL_GVT_GTT_HASH_BITS);
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DECLARE_HASHTABLE(guest_page_hash_table, INTEL_GVT_GTT_HASH_BITS);
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atomic_t n_write_protected_guest_page;
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DECLARE_HASHTABLE(tracked_guest_page_hash_table, INTEL_GVT_GTT_HASH_BITS);
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atomic_t n_tracked_guest_page;
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struct list_head oos_page_list_head;
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struct list_head post_shadow_list_head;
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struct intel_vgpu_scratch_pt scratch_pt[GTT_TYPE_MAX];
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};
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extern int intel_vgpu_init_gtt(struct intel_vgpu *vgpu);
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@ -228,12 +226,16 @@ struct intel_vgpu_shadow_page {
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unsigned long mfn;
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};
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struct intel_vgpu_guest_page {
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struct intel_vgpu_page_track {
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struct hlist_node node;
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bool writeprotection;
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bool tracked;
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unsigned long gfn;
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int (*handler)(void *, u64, void *, int);
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void *data;
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};
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struct intel_vgpu_guest_page {
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struct intel_vgpu_page_track track;
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unsigned long write_cnt;
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struct intel_vgpu_oos_page *oos_page;
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};
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@ -258,22 +260,16 @@ struct intel_vgpu_ppgtt_spt {
|
|||
struct list_head post_shadow_list;
|
||||
};
|
||||
|
||||
int intel_vgpu_init_guest_page(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_guest_page *guest_page,
|
||||
int intel_vgpu_init_page_track(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_page_track *t,
|
||||
unsigned long gfn,
|
||||
int (*handler)(void *gp, u64, void *, int),
|
||||
void *data);
|
||||
|
||||
void intel_vgpu_clean_guest_page(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_guest_page *guest_page);
|
||||
void intel_vgpu_clean_page_track(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_page_track *t);
|
||||
|
||||
int intel_vgpu_set_guest_page_writeprotection(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_guest_page *guest_page);
|
||||
|
||||
void intel_vgpu_clear_guest_page_writeprotection(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_guest_page *guest_page);
|
||||
|
||||
struct intel_vgpu_guest_page *intel_vgpu_find_guest_page(
|
||||
struct intel_vgpu_page_track *intel_vgpu_find_tracked_page(
|
||||
struct intel_vgpu *vgpu, unsigned long gfn);
|
||||
|
||||
int intel_vgpu_sync_oos_pages(struct intel_vgpu *vgpu);
|
||||
|
|
|
|||
|
|
@ -117,18 +117,18 @@ static void failsafe_emulate_mmio_rw(struct intel_vgpu *vgpu, uint64_t pa,
|
|||
else
|
||||
memcpy(pt, p_data, bytes);
|
||||
|
||||
} else if (atomic_read(&vgpu->gtt.n_write_protected_guest_page)) {
|
||||
struct intel_vgpu_guest_page *gp;
|
||||
} else if (atomic_read(&vgpu->gtt.n_tracked_guest_page)) {
|
||||
struct intel_vgpu_page_track *t;
|
||||
|
||||
/* Since we enter the failsafe mode early during guest boot,
|
||||
* guest may not have chance to set up its ppgtt table, so
|
||||
* there should not be any wp pages for guest. Keep the wp
|
||||
* related code here in case we need to handle it in furture.
|
||||
*/
|
||||
gp = intel_vgpu_find_guest_page(vgpu, pa >> PAGE_SHIFT);
|
||||
if (gp) {
|
||||
t = intel_vgpu_find_tracked_page(vgpu, pa >> PAGE_SHIFT);
|
||||
if (t) {
|
||||
/* remove write protection to prevent furture traps */
|
||||
intel_vgpu_clean_guest_page(vgpu, gp);
|
||||
intel_vgpu_clean_page_track(vgpu, t);
|
||||
if (read)
|
||||
intel_gvt_hypervisor_read_gpa(vgpu, pa,
|
||||
p_data, bytes);
|
||||
|
|
@ -170,17 +170,17 @@ int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, uint64_t pa,
|
|||
return ret;
|
||||
}
|
||||
|
||||
if (atomic_read(&vgpu->gtt.n_write_protected_guest_page)) {
|
||||
struct intel_vgpu_guest_page *gp;
|
||||
if (atomic_read(&vgpu->gtt.n_tracked_guest_page)) {
|
||||
struct intel_vgpu_page_track *t;
|
||||
|
||||
gp = intel_vgpu_find_guest_page(vgpu, pa >> PAGE_SHIFT);
|
||||
if (gp) {
|
||||
t = intel_vgpu_find_tracked_page(vgpu, pa >> PAGE_SHIFT);
|
||||
if (t) {
|
||||
ret = intel_gvt_hypervisor_read_gpa(vgpu, pa,
|
||||
p_data, bytes);
|
||||
if (ret) {
|
||||
gvt_vgpu_err("guest page read error %d, "
|
||||
"gfn 0x%lx, pa 0x%llx, var 0x%x, len %d\n",
|
||||
ret, gp->gfn, pa, *(u32 *)p_data,
|
||||
ret, t->gfn, pa, *(u32 *)p_data,
|
||||
bytes);
|
||||
}
|
||||
mutex_unlock(&gvt->lock);
|
||||
|
|
@ -267,17 +267,17 @@ int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, uint64_t pa,
|
|||
return ret;
|
||||
}
|
||||
|
||||
if (atomic_read(&vgpu->gtt.n_write_protected_guest_page)) {
|
||||
struct intel_vgpu_guest_page *gp;
|
||||
if (atomic_read(&vgpu->gtt.n_tracked_guest_page)) {
|
||||
struct intel_vgpu_page_track *t;
|
||||
|
||||
gp = intel_vgpu_find_guest_page(vgpu, pa >> PAGE_SHIFT);
|
||||
if (gp) {
|
||||
ret = gp->handler(gp, pa, p_data, bytes);
|
||||
t = intel_vgpu_find_tracked_page(vgpu, pa >> PAGE_SHIFT);
|
||||
if (t) {
|
||||
ret = t->handler(t, pa, p_data, bytes);
|
||||
if (ret) {
|
||||
gvt_err("guest page write error %d, "
|
||||
"gfn 0x%lx, pa 0x%llx, "
|
||||
"var 0x%x, len %d\n",
|
||||
ret, gp->gfn, pa,
|
||||
ret, t->gfn, pa,
|
||||
*(u32 *)p_data, bytes);
|
||||
}
|
||||
mutex_unlock(&gvt->lock);
|
||||
|
|
|
|||
|
|
@ -154,51 +154,53 @@ static inline unsigned long intel_gvt_hypervisor_virt_to_mfn(void *p)
|
|||
}
|
||||
|
||||
/**
|
||||
* intel_gvt_hypervisor_set_wp_page - set a guest page to write-protected
|
||||
* intel_gvt_hypervisor_enable - set a guest page to write-protected
|
||||
* @vgpu: a vGPU
|
||||
* @p: intel_vgpu_guest_page
|
||||
* @t: page track data structure
|
||||
*
|
||||
* Returns:
|
||||
* Zero on success, negative error code if failed.
|
||||
*/
|
||||
static inline int intel_gvt_hypervisor_set_wp_page(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_guest_page *p)
|
||||
static inline int intel_gvt_hypervisor_enable_page_track(
|
||||
struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_page_track *t)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (p->writeprotection)
|
||||
if (t->tracked)
|
||||
return 0;
|
||||
|
||||
ret = intel_gvt_host.mpt->set_wp_page(vgpu->handle, p->gfn);
|
||||
ret = intel_gvt_host.mpt->set_wp_page(vgpu->handle, t->gfn);
|
||||
if (ret)
|
||||
return ret;
|
||||
p->writeprotection = true;
|
||||
atomic_inc(&vgpu->gtt.n_write_protected_guest_page);
|
||||
t->tracked = true;
|
||||
atomic_inc(&vgpu->gtt.n_tracked_guest_page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* intel_gvt_hypervisor_unset_wp_page - remove the write-protection of a
|
||||
* intel_gvt_hypervisor_disable_page_track - remove the write-protection of a
|
||||
* guest page
|
||||
* @vgpu: a vGPU
|
||||
* @p: intel_vgpu_guest_page
|
||||
* @t: page track data structure
|
||||
*
|
||||
* Returns:
|
||||
* Zero on success, negative error code if failed.
|
||||
*/
|
||||
static inline int intel_gvt_hypervisor_unset_wp_page(struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_guest_page *p)
|
||||
static inline int intel_gvt_hypervisor_disable_page_track(
|
||||
struct intel_vgpu *vgpu,
|
||||
struct intel_vgpu_page_track *t)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!p->writeprotection)
|
||||
if (!t->tracked)
|
||||
return 0;
|
||||
|
||||
ret = intel_gvt_host.mpt->unset_wp_page(vgpu->handle, p->gfn);
|
||||
ret = intel_gvt_host.mpt->unset_wp_page(vgpu->handle, t->gfn);
|
||||
if (ret)
|
||||
return ret;
|
||||
p->writeprotection = false;
|
||||
atomic_dec(&vgpu->gtt.n_write_protected_guest_page);
|
||||
t->tracked = false;
|
||||
atomic_dec(&vgpu->gtt.n_tracked_guest_page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue