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Commit 54c81653 authored by Changbin Du's avatar Changbin Du Committed by Zhenyu Wang
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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: default avatarChangbin Du <changbin.du@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent b901b252

drivers/gpu/drm/i915/gvt/gtt.c

+15 −5
Original line number Diff line number Diff line
@@ -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)));



	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)

	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 (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)) {