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drm/i915/gvt: Handle special sequence on PDE IPS bit 

If the guest update the 64K gtt entry before changing IPS bit of PDE, we
need to re-shadow the whole page table. Because we have ignored all
updates to unused entries.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Changbin Du 2018-05-15 10:35:44 +08:00 committed by Zhenyu Wang
parent b901b252b6
commit 54c81653bd
1 changed files with 17 additions and 7 deletions
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24
drivers/gpu/drm/i915/gvt/gtt.c
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@ -1045,14 +1045,24 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_spt_by_guest_entry(
GEM_BUG_ON(!gtt_type_is_pt(get_next_pt_type(we->type)));
spt = intel_vgpu_find_spt_by_gfn(vgpu, ops->get_pfn(we));
if (spt)
ppgtt_get_spt(spt);
else {
int type = get_next_pt_type(we->type);
if (we->type == GTT_TYPE_PPGTT_PDE_ENTRY)
ips = vgpu_ips_enabled(vgpu) && ops->test_ips(we);
if (we->type == GTT_TYPE_PPGTT_PDE_ENTRY)
ips = vgpu_ips_enabled(vgpu) && ops->test_ips(we);
spt = intel_vgpu_find_spt_by_gfn(vgpu, ops->get_pfn(we));
if (spt) {
ppgtt_get_spt(spt);
if (ips != spt->guest_page.pde_ips) {
spt->guest_page.pde_ips = ips;
gvt_dbg_mm("reshadow PDE since ips changed\n");
clear_page(spt->shadow_page.vaddr);
ret = ppgtt_populate_spt(spt);
if (ret)
goto fail;
}
} else {
int type = get_next_pt_type(we->type);
spt = ppgtt_alloc_spt_gfn(vgpu, type, ops->get_pfn(we), ips);
if (IS_ERR(spt)) {