[Intel-gfx] [RFC 7/7] drm/i915/gvt: Translate virtual PPAT indexes

[Zhi Wang]

Translate virtual PPAT indexes into physical PPAT indexes, according to
the mapping between virtual PPAT indexes and physical PPAT indexes during
building a PPGTT shadow page table.

Signed-off-by: Zhi Wang <zhi.a.wang at intel.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 6ec2a03..5487375 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -539,6 +539,24 @@ static struct intel_gvt_gtt_pat_ops gen8_pat_ops = {
 	.match_pat_value = gen8_pat_match_value,
 };
 
+static inline void translate_ppat(struct intel_vgpu *vgpu,
+			     struct intel_gvt_gtt_entry *ge,
+			     struct intel_gvt_gtt_entry *se)
+{
+	struct intel_gvt *gvt = vgpu->gvt;
+	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
+
+	unsigned int virtual_ppat_index;
+
+	if (!gvt->gtt.has_ppat)
+		return;
+
+	WARN_ON(!vgpu->gtt.ppat_configured);
+
+	virtual_ppat_index = ops->get_pat_index(ge);
+	ops->set_pat_index(se, vgpu->gtt.ppat_index[virtual_ppat_index]);
+}
+
 static int gtt_entry_p2m(struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *p,
 		struct intel_gvt_gtt_entry *m)
 {
@@ -559,6 +577,8 @@ static int gtt_entry_p2m(struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *p,
 	}
 
 	ops->set_pfn(m, mfn);
+
+	translate_ppat(vgpu, p, m);
 	return 0;
 }
 
@@ -1051,6 +1071,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
 	return ERR_PTR(ret);
 }
 
+
 static inline void ppgtt_generate_shadow_entry(struct intel_gvt_gtt_entry *se,
 		struct intel_vgpu_ppgtt_spt *s, struct intel_gvt_gtt_entry *ge)
 {
@@ -1060,6 +1081,8 @@ static inline void ppgtt_generate_shadow_entry(struct intel_gvt_gtt_entry *se,
 	se->val64 = ge->val64;
 
 	ops->set_pfn(se, s->shadow_page.mfn);
+
+	translate_ppat(s->vgpu, ge, se);
 }
 
 static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
-- 
2.7.4