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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 2017-09-29 02:47:55 +08:00 committed by Zhenyu Wang
parent f52c380a48
commit 7d1e5cdf01
4 changed files with 147 additions and 125 deletions
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174
drivers/gpu/drm/i915/gvt/gtt.c
View File

@ -494,7 +494,7 @@ static inline int ppgtt_spt_get_entry(
return -EINVAL;
ret = ops->get_entry(page_table, e, index, guest,
spt->guest_page.gfn << GTT_PAGE_SHIFT,
spt->guest_page.track.gfn << GTT_PAGE_SHIFT,
spt->vgpu);
if (ret)
return ret;
@ -516,7 +516,7 @@ static inline int ppgtt_spt_set_entry(
return -EINVAL;
return ops->set_entry(page_table, e, index, guest,
spt->guest_page.gfn << GTT_PAGE_SHIFT,
spt->guest_page.track.gfn << GTT_PAGE_SHIFT,
spt->vgpu);
}
@ -537,84 +537,99 @@ static inline int ppgtt_spt_set_entry(
spt->shadow_page.type, e, index, false)
/**
* intel_vgpu_init_guest_page - init a guest page data structure
* intel_vgpu_init_page_track - init a page track data structure
* @vgpu: a vGPU
* @p: a guest page data structure
* @t: a page track data structure
* @gfn: guest memory page frame number
* @handler: function will be called when target guest memory page has
* @handler: the function will be called when target guest memory page has
* been modified.
*
* This function is called when user wants to track a guest memory page.
* This function is called when a user wants to prepare a page track data
* structure to track a guest memory page.
*
* Returns:
* Zero on success, negative error code if failed.
*/
int intel_vgpu_init_guest_page(struct intel_vgpu *vgpu,
int intel_vgpu_init_page_track(struct intel_vgpu *vgpu,
struct intel_vgpu_page_track *t,
unsigned long gfn,
int (*handler)(void *, u64, void *, int),
void *data)
{
INIT_HLIST_NODE(&t->node);
t->tracked = false;
t->gfn = gfn;
t->handler = handler;
t->data = data;
hash_add(vgpu->gtt.tracked_guest_page_hash_table, &t->node, t->gfn);
return 0;
}
/**
* intel_vgpu_clean_page_track - release a page track data structure
* @vgpu: a vGPU
* @t: a page track data structure
*
* This function is called before a user frees a page track data structure.
*/
void intel_vgpu_clean_page_track(struct intel_vgpu *vgpu,
struct intel_vgpu_page_track *t)
{
if (!hlist_unhashed(&t->node))
hash_del(&t->node);
if (t->tracked)
intel_gvt_hypervisor_disable_page_track(vgpu, t);
}
/**
* intel_vgpu_find_tracked_page - find a tracked guest page
* @vgpu: a vGPU
* @gfn: guest memory page frame number
*
* This function is called when the emulation layer wants to figure out if a
* trapped GFN is a tracked guest page.
*
* Returns:
* Pointer to page track data structure, NULL if not found.
*/
struct intel_vgpu_page_track *intel_vgpu_find_tracked_page(
struct intel_vgpu *vgpu, unsigned long gfn)
{
struct intel_vgpu_page_track *t;
hash_for_each_possible(vgpu->gtt.tracked_guest_page_hash_table,
t, node, gfn) {
if (t->gfn == gfn)
return t;
}
return NULL;
}
static int init_guest_page(struct intel_vgpu *vgpu,
struct intel_vgpu_guest_page *p,
unsigned long gfn,
int (*handler)(void *, u64, void *, int),
void *data)
{
INIT_HLIST_NODE(&p->node);
p->writeprotection = false;
p->gfn = gfn;
p->handler = handler;
p->data = data;
p->oos_page = NULL;
p->write_cnt = 0;
hash_add(vgpu->gtt.guest_page_hash_table, &p->node, p->gfn);
return 0;
return intel_vgpu_init_page_track(vgpu, &p->track, gfn, handler, data);
}
static int detach_oos_page(struct intel_vgpu *vgpu,
struct intel_vgpu_oos_page *oos_page);
/**
* intel_vgpu_clean_guest_page - release the resource owned by guest page data
* structure
* @vgpu: a vGPU
* @p: a tracked guest page
*
* This function is called when user tries to stop tracking a guest memory
* page.
*/
void intel_vgpu_clean_guest_page(struct intel_vgpu *vgpu,
static void clean_guest_page(struct intel_vgpu *vgpu,
struct intel_vgpu_guest_page *p)
{
if (!hlist_unhashed(&p->node))
hash_del(&p->node);
if (p->oos_page)
detach_oos_page(vgpu, p->oos_page);
if (p->writeprotection)
intel_gvt_hypervisor_unset_wp_page(vgpu, p);
}
/**
* intel_vgpu_find_guest_page - find a guest page data structure by GFN.
* @vgpu: a vGPU
* @gfn: guest memory page frame number
*
* This function is called when emulation logic wants to know if a trapped GFN
* is a tracked guest page.
*
* Returns:
* Pointer to guest page data structure, NULL if failed.
*/
struct intel_vgpu_guest_page *intel_vgpu_find_guest_page(
struct intel_vgpu *vgpu, unsigned long gfn)
{
struct intel_vgpu_guest_page *p;
hash_for_each_possible(vgpu->gtt.guest_page_hash_table,
p, node, gfn) {
if (p->gfn == gfn)
return p;
}
return NULL;
intel_vgpu_clean_page_track(vgpu, &p->track);
}
static inline int init_shadow_page(struct intel_vgpu *vgpu,
@ -664,6 +679,9 @@ static inline struct intel_vgpu_shadow_page *find_shadow_page(
return NULL;
}
#define page_track_to_guest_page(ptr) \
container_of(ptr, struct intel_vgpu_guest_page, track)
#define guest_page_to_ppgtt_spt(ptr) \
container_of(ptr, struct intel_vgpu_ppgtt_spt, guest_page)
@ -697,7 +715,7 @@ static void ppgtt_free_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
trace_spt_free(spt->vgpu->id, spt, spt->shadow_page.type);
clean_shadow_page(spt->vgpu, &spt->shadow_page);
intel_vgpu_clean_guest_page(spt->vgpu, &spt->guest_page);
clean_guest_page(spt->vgpu, &spt->guest_page);
list_del_init(&spt->post_shadow_list);
free_spt(spt);
@ -713,22 +731,24 @@ static void ppgtt_free_all_shadow_page(struct intel_vgpu *vgpu)
ppgtt_free_shadow_page(shadow_page_to_ppgtt_spt(sp));
}
static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
static int ppgtt_handle_guest_write_page_table_bytes(
struct intel_vgpu_guest_page *gpt,
u64 pa, void *p_data, int bytes);
static int ppgtt_write_protection_handler(void *gp, u64 pa,
static int ppgtt_write_protection_handler(void *data, u64 pa,
void *p_data, int bytes)
{
struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp;
struct intel_vgpu_page_track *t = data;
struct intel_vgpu_guest_page *p = page_track_to_guest_page(t);
int ret;
if (bytes != 4 && bytes != 8)
return -EINVAL;
if (!gpt->writeprotection)
if (!t->tracked)
return -EINVAL;
ret = ppgtt_handle_guest_write_page_table_bytes(gp,
ret = ppgtt_handle_guest_write_page_table_bytes(p,
pa, p_data, bytes);
if (ret)
return ret;
@ -768,7 +788,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_alloc_shadow_page(
goto err;
}
ret = intel_vgpu_init_guest_page(vgpu, &spt->guest_page,
ret = init_guest_page(vgpu, &spt->guest_page,
gfn, ppgtt_write_protection_handler, NULL);
if (ret) {
gvt_vgpu_err("fail to initialize guest page for spt\n");
@ -856,7 +876,7 @@ static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
int v = atomic_read(&spt->refcount);
trace_spt_change(spt->vgpu->id, "die", spt,
spt->guest_page.gfn, spt->shadow_page.type);
spt->guest_page.track.gfn, spt->shadow_page.type);
trace_spt_refcount(spt->vgpu->id, "dec", spt, v, (v - 1));
@ -878,7 +898,7 @@ static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
}
release:
trace_spt_change(spt->vgpu->id, "release", spt,
spt->guest_page.gfn, spt->shadow_page.type);
spt->guest_page.track.gfn, spt->shadow_page.type);
ppgtt_free_shadow_page(spt);
return 0;
fail:
@ -895,6 +915,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
struct intel_vgpu_ppgtt_spt *s = NULL;
struct intel_vgpu_guest_page *g;
struct intel_vgpu_page_track *t;
int ret;
if (WARN_ON(!gtt_type_is_pt(get_next_pt_type(we->type)))) {
@ -902,8 +923,9 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
goto fail;
}
g = intel_vgpu_find_guest_page(vgpu, ops->get_pfn(we));
if (g) {
t = intel_vgpu_find_tracked_page(vgpu, ops->get_pfn(we));
if (t) {
g = page_track_to_guest_page(t);
s = guest_page_to_ppgtt_spt(g);
ppgtt_get_shadow_page(s);
} else {
@ -915,7 +937,8 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
goto fail;
}
ret = intel_gvt_hypervisor_set_wp_page(vgpu, &s->guest_page);
ret = intel_gvt_hypervisor_enable_page_track(vgpu,
&s->guest_page.track);
if (ret)
goto fail;
@ -923,7 +946,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
if (ret)
goto fail;
trace_spt_change(vgpu->id, "new", s, s->guest_page.gfn,
trace_spt_change(vgpu->id, "new", s, s->guest_page.track.gfn,
s->shadow_page.type);
}
return s;
@ -953,7 +976,7 @@ static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
int ret;
trace_spt_change(spt->vgpu->id, "born", spt,
spt->guest_page.gfn, spt->shadow_page.type);
spt->guest_page.track.gfn, spt->shadow_page.type);
if (gtt_type_is_pte_pt(spt->shadow_page.type)) {
for_each_present_guest_entry(spt, &ge, i) {
@ -1082,7 +1105,7 @@ static int sync_oos_page(struct intel_vgpu *vgpu,
index++) {
ops->get_entry(oos_page->mem, &old, index, false, 0, vgpu);
ops->get_entry(NULL, &new, index, true,
oos_page->guest_page->gfn << PAGE_SHIFT, vgpu);
oos_page->guest_page->track.gfn << PAGE_SHIFT, vgpu);
if (old.val64 == new.val64
&& !test_and_clear_bit(index, spt->post_shadow_bitmap))
@ -1132,7 +1155,8 @@ static int attach_oos_page(struct intel_vgpu *vgpu,
struct intel_gvt *gvt = vgpu->gvt;
int ret;
ret = intel_gvt_hypervisor_read_gpa(vgpu, gpt->gfn << GTT_PAGE_SHIFT,
ret = intel_gvt_hypervisor_read_gpa(vgpu,
gpt->track.gfn << GTT_PAGE_SHIFT,
oos_page->mem, GTT_PAGE_SIZE);
if (ret)
return ret;
@ -1152,7 +1176,7 @@ static int ppgtt_set_guest_page_sync(struct intel_vgpu *vgpu,
{
int ret;
ret = intel_gvt_hypervisor_set_wp_page(vgpu, gpt);
ret = intel_gvt_hypervisor_enable_page_track(vgpu, &gpt->track);
if (ret)
return ret;
@ -1200,7 +1224,7 @@ static int ppgtt_set_guest_page_oos(struct intel_vgpu *vgpu,
gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type);
list_add_tail(&oos_page->vm_list, &vgpu->gtt.oos_page_list_head);
return intel_gvt_hypervisor_unset_wp_page(vgpu, gpt);
return intel_gvt_hypervisor_disable_page_track(vgpu, &gpt->track);
}
/**
@ -1335,10 +1359,10 @@ int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu)
return 0;
}
static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
static int ppgtt_handle_guest_write_page_table_bytes(
struct intel_vgpu_guest_page *gpt,
u64 pa, void *p_data, int bytes)
{
struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp;
struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
struct intel_vgpu *vgpu = spt->vgpu;
struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
@ -2032,7 +2056,7 @@ int intel_vgpu_init_gtt(struct intel_vgpu *vgpu)
struct intel_vgpu_gtt *gtt = &vgpu->gtt;
struct intel_vgpu_mm *ggtt_mm;
hash_init(gtt->guest_page_hash_table);
hash_init(gtt->tracked_guest_page_hash_table);
hash_init(gtt->shadow_page_hash_table);
INIT_LIST_HEAD(&gtt->mm_list_head);

30
drivers/gpu/drm/i915/gvt/gtt.h
View File

@ -193,18 +193,16 @@ struct intel_vgpu_scratch_pt {
unsigned long page_mfn;
};
struct intel_vgpu_gtt {
struct intel_vgpu_mm *ggtt_mm;
unsigned long active_ppgtt_mm_bitmap;
struct list_head mm_list_head;
DECLARE_HASHTABLE(shadow_page_hash_table, INTEL_GVT_GTT_HASH_BITS);
DECLARE_HASHTABLE(guest_page_hash_table, INTEL_GVT_GTT_HASH_BITS);
atomic_t n_write_protected_guest_page;
DECLARE_HASHTABLE(tracked_guest_page_hash_table, INTEL_GVT_GTT_HASH_BITS);
atomic_t n_tracked_guest_page;
struct list_head oos_page_list_head;
struct list_head post_shadow_list_head;
struct intel_vgpu_scratch_pt scratch_pt[GTT_TYPE_MAX];
};
extern int intel_vgpu_init_gtt(struct intel_vgpu *vgpu);
@ -228,12 +226,16 @@ struct intel_vgpu_shadow_page {
unsigned long mfn;
};
struct intel_vgpu_guest_page {
struct intel_vgpu_page_track {
struct hlist_node node;
bool writeprotection;
bool tracked;
unsigned long gfn;
int (*handler)(void *, u64, void *, int);
void *data;
};
struct intel_vgpu_guest_page {
struct intel_vgpu_page_track track;
unsigned long write_cnt;
struct intel_vgpu_oos_page *oos_page;
};
@ -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);

32
drivers/gpu/drm/i915/gvt/mmio.c
View File

@ -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);

34
drivers/gpu/drm/i915/gvt/mpt.h
View File

@ -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;
}