From: Changbin Du <changbin.du@intel.com>
Date: Tue, 15 May 2018 10:35:44 +0800
Subject: drm/i915/gvt: Handle special sequence on PDE IPS bit
Git-commit: 54c81653bd67ce2a11fa08295d9148385ea29603
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1045,14 +1045,24 @@ static struct intel_vgpu_ppgtt_spt *ppgt
 
 	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)) {