drm/i915/gvt: remove interface intel_gvt_is_valid_gfn

Currently intel_gvt_is_valid_gfn() is called in two places:
(1) shadowing guest GGTT entry
(2) shadowing guest PPGTT leaf entry,
which was introduced in commit cc753fb
("drm/i915/gvt: validate gfn before set shadow page entry").

However, now it's not necessary to call this interface any more, because
a. GGTT partial write issue has been fixed by
   commit bc0686f
   ("drm/i915/gvt: support inconsecutive partial gtt entry write")
   commit 510fe10
   ("drm/i915/gvt: fix a bug of partially write ggtt enties")
b. PPGTT resides in normal guest RAM and we only treat 8-byte writes
   as valid page table writes. Any invalid GPA found is regarded as
   an error, either due to guest misbehavior/attack or bug in host
   shadow code.
   So,rather than do GFN pre-checking and replace invalid GFNs with
   scratch GFN and continue silently, just remove the pre-checking and
   abort PPGTT shadowing on error detected.
c. GFN validity check is still performed in
   intel_gvt_dma_map_guest_page() --> gvt_pin_guest_page().
   It's more desirable to call VFIO interface to do both validity check
   and mapping.
   Calling intel_gvt_is_valid_gfn() to do GFN validity check from KVM side
   while later mapping the GFN through VFIO interface is unnecessarily
   fragile and confusing for unaware readers.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
[sean: remove now-unused local variables]
Acked-by: Zhi Wang <zhi.a.wang@intel.com>
Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Link: https://lore.kernel.org/r/20230729013535.1070024-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: yanzhao56

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

@@ -49,22 +49,6 @@
 static bool enable_out_of_sync = false;
 static int preallocated_oos_pages = 8192;
 
-static bool intel_gvt_is_valid_gfn(struct intel_vgpu *vgpu, unsigned long gfn)
-{
-	struct kvm *kvm = vgpu->vfio_device.kvm;
-	int idx;
-	bool ret;
-
-	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
-		return false;
-
-	idx = srcu_read_lock(&kvm->srcu);
-	ret = kvm_is_visible_gfn(kvm, gfn);
-	srcu_read_unlock(&kvm->srcu, idx);
-
-	return ret;
-}
-
 /*
  * validate a gm address and related range size,
  * translate it to host gm address
@@ -1333,11 +1317,9 @@ static int ppgtt_populate_shadow_entry(struct intel_vgpu *vgpu,
 static int ppgtt_populate_spt(struct intel_vgpu_ppgtt_spt *spt)
 {
 	struct intel_vgpu *vgpu = spt->vgpu;
-	struct intel_gvt *gvt = vgpu->gvt;
-	const struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *s;
 	struct intel_gvt_gtt_entry se, ge;
-	unsigned long gfn, i;
+	unsigned long i;
 	int ret;
 
 	trace_spt_change(spt->vgpu->id, "born", spt,
@@ -1354,13 +1336,6 @@ static int ppgtt_populate_spt(struct intel_vgpu_ppgtt_spt *spt)
 			ppgtt_generate_shadow_entry(&se, s, &ge);
 			ppgtt_set_shadow_entry(spt, &se, i);
 		} else {
-			gfn = ops->get_pfn(&ge);
-			if (!intel_gvt_is_valid_gfn(vgpu, gfn)) {
-				ops->set_pfn(&se, gvt->gtt.scratch_mfn);
-				ppgtt_set_shadow_entry(spt, &se, i);
-				continue;
-			}
-
 			ret = ppgtt_populate_shadow_entry(vgpu, spt, i, &ge);
 			if (ret)
 				goto fail;
@@ -2335,14 +2310,6 @@ static int emulate_ggtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
 		m.val64 = e.val64;
 		m.type = e.type;
 
-		/* one PTE update may be issued in multiple writes and the
-		 * first write may not construct a valid gfn
-		 */
-		if (!intel_gvt_is_valid_gfn(vgpu, gfn)) {
-			ops->set_pfn(&m, gvt->gtt.scratch_mfn);
-			goto out;
-		}
-
 		ret = intel_gvt_dma_map_guest_page(vgpu, gfn, PAGE_SIZE,
 						   &dma_addr);
 		if (ret) {
@@ -2359,7 +2326,6 @@ static int emulate_ggtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
 		ops->clear_present(&m);
 	}
 
-out:
 	ggtt_set_guest_entry(ggtt_mm, &e, g_gtt_index);
 
 	ggtt_get_host_entry(ggtt_mm, &e, g_gtt_index);