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drm/i915/gvt: don't rely on guest PPGTT entry to free old shadow data 

On guest writing a PPGTT entry, if it contains value and the old
entry is valid, gvt will read it and find & free the corresponding
old data for it. However, with the KVM write protection provided
by page_track, the guest entry will be written with new value
before gvt handling. To avoid that, we should use the shadow
entry instead.

Signed-off-by: Bing Niu <bing.niu@intel.com>
Signed-off-by: Jike Song <jike.song@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Bing Niu 2016-11-07 10:44:36 +08:00 committed by Zhenyu Wang
parent 11840e2fff
commit 9baf0920b5
1 changed files with 17 additions and 34 deletions
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51
drivers/gpu/drm/i915/gvt/gtt.c
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@ -974,7 +974,7 @@ fail:
}
static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_guest_page *gpt,
struct intel_gvt_gtt_entry *we, unsigned long index)
unsigned long index)
{
struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
struct intel_vgpu_shadow_page *sp = &spt->shadow_page;
@ -983,25 +983,26 @@ static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_guest_page *gpt,
struct intel_gvt_gtt_entry e;
int ret;
trace_gpt_change(spt->vgpu->id, "remove", spt, sp->type,
we->val64, index);
ppgtt_get_shadow_entry(spt, &e, index);
trace_gpt_change(spt->vgpu->id, "remove", spt, sp->type, e.val64,
index);
if (!ops->test_present(&e))
return 0;
if (ops->get_pfn(&e) == vgpu->gtt.scratch_pt[sp->type].page_mfn)
return 0;
if (gtt_type_is_pt(get_next_pt_type(we->type))) {
struct intel_vgpu_guest_page *g =
intel_vgpu_find_guest_page(vgpu, ops->get_pfn(we));
if (!g) {
if (gtt_type_is_pt(get_next_pt_type(e.type))) {
struct intel_vgpu_ppgtt_spt *s =
ppgtt_find_shadow_page(vgpu, ops->get_pfn(&e));
if (!s) {
gvt_err("fail to find guest page\n");
ret = -ENXIO;
goto fail;
}
ret = ppgtt_invalidate_shadow_page(guest_page_to_ppgtt_spt(g));
ret = ppgtt_invalidate_shadow_page(s);
if (ret)
goto fail;
}
@ -1010,7 +1011,7 @@ static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_guest_page *gpt,
return 0;
fail:
gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n",
vgpu->id, spt, we->val64, we->type);
vgpu->id, spt, e.val64, e.type);
return ret;
}
@ -1231,23 +1232,16 @@ static int ppgtt_handle_guest_write_page_table(
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;
struct intel_gvt_gtt_entry ge;
int old_present, new_present;
int ret;
int new_present;
ppgtt_get_guest_entry(spt, &ge, index);
old_present = ops->test_present(&ge);
new_present = ops->test_present(we);
ppgtt_set_guest_entry(spt, we, index);
ret = ppgtt_handle_guest_entry_removal(gpt, index);
if (ret)
goto fail;
if (old_present) {
ret = ppgtt_handle_guest_entry_removal(gpt, &ge, index);
if (ret)
goto fail;
}
if (new_present) {
ret = ppgtt_handle_guest_entry_add(gpt, we, index);
if (ret)
@ -1293,7 +1287,7 @@ int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu)
{
struct list_head *pos, *n;
struct intel_vgpu_ppgtt_spt *spt;
struct intel_gvt_gtt_entry ge, e;
struct intel_gvt_gtt_entry ge;
unsigned long index;
int ret;
@ -1304,9 +1298,6 @@ int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu)
for_each_set_bit(index, spt->post_shadow_bitmap,
GTT_ENTRY_NUM_IN_ONE_PAGE) {
ppgtt_get_guest_entry(spt, &ge, index);
e = ge;
e.val64 = 0;
ppgtt_set_guest_entry(spt, &e, index);
ret = ppgtt_handle_guest_write_page_table(
&spt->guest_page, &ge, index);
@ -1334,8 +1325,6 @@ static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
index = (pa & (PAGE_SIZE - 1)) >> info->gtt_entry_size_shift;
ppgtt_get_guest_entry(spt, &we, index);
memcpy((void *)&we.val64 + (pa & (info->gtt_entry_size - 1)),
p_data, bytes);
ops->test_pse(&we);
@ -1344,19 +1333,13 @@ static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
if (ret)
return ret;
} else {
struct intel_gvt_gtt_entry ge;
ppgtt_get_guest_entry(spt, &ge, index);
if (!test_bit(index, spt->post_shadow_bitmap)) {
ret = ppgtt_handle_guest_entry_removal(gpt,
&ge, index);
ret = ppgtt_handle_guest_entry_removal(gpt, index);
if (ret)
return ret;
}
ppgtt_set_post_shadow(spt, index);
ppgtt_set_guest_entry(spt, &we, index);
}
if (!enable_out_of_sync)