KVM: x86/mmu: Rename page-track APIs to reflect the new reality

Rename the page-track APIs to capture that they're all about tracking
writes, now that the facade of supporting multiple modes is gone.

Opportunstically replace "slot" with "gfn" in anticipation of removing
the @slot param from the external APIs.

No functional change intended.

Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Link: https://lore.kernel.org/r/20230729013535.1070024-25-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_page_track.h

@@ -4,10 +4,10 @@
 
 #include <linux/kvm_types.h>
 
-void kvm_slot_page_track_add_page(struct kvm *kvm,
+void kvm_write_track_add_gfn(struct kvm *kvm,
-				  struct kvm_memory_slot *slot, gfn_t gfn);
+			     struct kvm_memory_slot *slot, gfn_t gfn);
-void kvm_slot_page_track_remove_page(struct kvm *kvm,
+void kvm_write_track_remove_gfn(struct kvm *kvm, struct kvm_memory_slot *slot,
-				     struct kvm_memory_slot *slot, gfn_t gfn);
+				gfn_t gfn);
 
 #ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
 /*

arch/x86/kvm/mmu/mmu.c

@@ -831,7 +831,7 @@ static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
 
 	/* the non-leaf shadow pages are keeping readonly. */
 	if (sp->role.level > PG_LEVEL_4K)
-		return kvm_slot_page_track_add_page(kvm, slot, gfn);
+		return kvm_write_track_add_gfn(kvm, slot, gfn);
 
 	kvm_mmu_gfn_disallow_lpage(slot, gfn);
 
@@ -877,7 +877,7 @@ static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
 	slots = kvm_memslots_for_spte_role(kvm, sp->role);
 	slot = __gfn_to_memslot(slots, gfn);
 	if (sp->role.level > PG_LEVEL_4K)
-		return kvm_slot_page_track_remove_page(kvm, slot, gfn);
+		return kvm_write_track_remove_gfn(kvm, slot, gfn);
 
 	kvm_mmu_gfn_allow_lpage(slot, gfn);
 }
@@ -2807,7 +2807,7 @@ int mmu_try_to_unsync_pages(struct kvm *kvm, const struct kvm_memory_slot *slot,
 	 * track machinery is used to write-protect upper-level shadow pages,
 	 * i.e. this guards the role.level == 4K assertion below!
 	 */
-	if (kvm_slot_page_track_is_active(kvm, slot, gfn))
+	if (kvm_gfn_is_write_tracked(kvm, slot, gfn))
 		return -EPERM;
 
 	/*
@@ -4201,7 +4201,7 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
 	 * guest is writing the page which is write tracked which can
 	 * not be fixed by page fault handler.
 	 */
-	if (kvm_slot_page_track_is_active(vcpu->kvm, fault->slot, fault->gfn))
+	if (kvm_gfn_is_write_tracked(vcpu->kvm, fault->slot, fault->gfn))
 		return true;
 
 	return false;

arch/x86/kvm/mmu/page_track.c

@@ -84,8 +84,8 @@ static void update_gfn_write_track(struct kvm_memory_slot *slot, gfn_t gfn,
  * @slot: the @gfn belongs to.
  * @gfn: the guest page.
  */
-void kvm_slot_page_track_add_page(struct kvm *kvm,
+void kvm_write_track_add_gfn(struct kvm *kvm, struct kvm_memory_slot *slot,
-				  struct kvm_memory_slot *slot, gfn_t gfn)
+			     gfn_t gfn)
 {
 	if (WARN_ON_ONCE(!kvm_page_track_write_tracking_enabled(kvm)))
 		return;
@@ -101,12 +101,11 @@ void kvm_slot_page_track_add_page(struct kvm *kvm,
 	if (kvm_mmu_slot_gfn_write_protect(kvm, slot, gfn, PG_LEVEL_4K))
 		kvm_flush_remote_tlbs(kvm);
 }
-EXPORT_SYMBOL_GPL(kvm_slot_page_track_add_page);
+EXPORT_SYMBOL_GPL(kvm_write_track_add_gfn);
 
 /*
  * remove the guest page from the tracking pool which stops the interception
- * of corresponding access on that page. It is the opposed operation of
+ * of corresponding access on that page.
- * kvm_slot_page_track_add_page().
  *
  * It should be called under the protection both of mmu-lock and kvm->srcu
  * or kvm->slots_lock.
@@ -115,8 +114,8 @@ EXPORT_SYMBOL_GPL(kvm_slot_page_track_add_page);
  * @slot: the @gfn belongs to.
  * @gfn: the guest page.
  */
-void kvm_slot_page_track_remove_page(struct kvm *kvm,
+void kvm_write_track_remove_gfn(struct kvm *kvm,
-				     struct kvm_memory_slot *slot, gfn_t gfn)
+				struct kvm_memory_slot *slot, gfn_t gfn)
 {
 	if (WARN_ON_ONCE(!kvm_page_track_write_tracking_enabled(kvm)))
 		return;
@@ -129,14 +128,13 @@ void kvm_slot_page_track_remove_page(struct kvm *kvm,
 	 */
 	kvm_mmu_gfn_allow_lpage(slot, gfn);
 }
-EXPORT_SYMBOL_GPL(kvm_slot_page_track_remove_page);
+EXPORT_SYMBOL_GPL(kvm_write_track_remove_gfn);
 
 /*
  * check if the corresponding access on the specified guest page is tracked.
  */
-bool kvm_slot_page_track_is_active(struct kvm *kvm,
+bool kvm_gfn_is_write_tracked(struct kvm *kvm,
-				   const struct kvm_memory_slot *slot,
+			      const struct kvm_memory_slot *slot, gfn_t gfn)
-				   gfn_t gfn)
 {
 	int index;
 

arch/x86/kvm/mmu/page_track.h

@@ -15,8 +15,8 @@ int kvm_page_track_create_memslot(struct kvm *kvm,
 				  struct kvm_memory_slot *slot,
 				  unsigned long npages);
 
-bool kvm_slot_page_track_is_active(struct kvm *kvm,
+bool kvm_gfn_is_write_tracked(struct kvm *kvm,
-				   const struct kvm_memory_slot *slot, gfn_t gfn);
+			      const struct kvm_memory_slot *slot, gfn_t gfn);
 
 #ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
 int kvm_page_track_init(struct kvm *kvm);

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

@@ -1564,7 +1564,7 @@ int intel_gvt_page_track_add(struct intel_vgpu *info, u64 gfn)
 	}
 
 	write_lock(&kvm->mmu_lock);
-	kvm_slot_page_track_add_page(kvm, slot, gfn);
+	kvm_write_track_add_gfn(kvm, slot, gfn);
 	write_unlock(&kvm->mmu_lock);
 
 	srcu_read_unlock(&kvm->srcu, idx);
@@ -1593,7 +1593,7 @@ int intel_gvt_page_track_remove(struct intel_vgpu *info, u64 gfn)
 	}
 
 	write_lock(&kvm->mmu_lock);
-	kvm_slot_page_track_remove_page(kvm, slot, gfn);
+	kvm_write_track_remove_gfn(kvm, slot, gfn);
 	write_unlock(&kvm->mmu_lock);
 	srcu_read_unlock(&kvm->srcu, idx);