KVM: x86: Remove the unused page-track hook track_flush_slot()

Remove ->track_remove_slot(), there are no longer any users and it's
unlikely a "flush" hook will ever be the correct API to provide to an
external page-track user.

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Link: https://lore.kernel.org/r/20230729013535.1070024-21-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
index cfd36c2..5c348ff 100644 (file)
--- a/arch/x86/include/asm/kvm_page_track.h
+++ b/arch/x86/include/asm/kvm_page_track.h
@@ -33,16 +33,6 @@ struct kvm_page_track_notifier_node {
         */
        void (*track_write)(gpa_t gpa, const u8 *new, int bytes,
                            struct kvm_page_track_notifier_node *node);
-       /*
-        * It is called when memory slot is being moved or removed
-        * users can drop write-protection for the pages in that memory slot
-        *
-        * @kvm: the kvm where memory slot being moved or removed
-        * @slot: the memory slot being moved or removed
-        * @node: this node
-        */
-       void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot,
-                           struct kvm_page_track_notifier_node *node);
 
        /*
         * Invoked when a memory region is removed from the guest.  Or in KVM
@@ -85,7 +75,6 @@ kvm_page_track_unregister_notifier(struct kvm *kvm,
                                   struct kvm_page_track_notifier_node *n);
 void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
                          int bytes);
-void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot);
 void kvm_page_track_delete_slot(struct kvm *kvm, struct kvm_memory_slot *slot);
 
 bool kvm_page_track_has_external_user(struct kvm *kvm);

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 2838564..90a528d 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6695,8 +6695,6 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
                                   struct kvm_memory_slot *slot)
 {
        kvm_mmu_zap_all_fast(kvm);
-
-       kvm_page_track_flush_slot(kvm, slot);
 }
 
 void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen)

diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 640e383..98fb963 100644 (file)
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -279,32 +279,6 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
 }
 
 /*
- * Notify the node that memory slot is being removed or moved so that it can
- * drop write-protection for the pages in the memory slot.
- *
- * The node should figure out it has any write-protected pages in this slot
- * by itself.
- */
-void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot)
-{
-       struct kvm_page_track_notifier_head *head;
-       struct kvm_page_track_notifier_node *n;
-       int idx;
-
-       head = &kvm->arch.track_notifier_head;
-
-       if (hlist_empty(&head->track_notifier_list))
-               return;
-
-       idx = srcu_read_lock(&head->track_srcu);
-       hlist_for_each_entry_srcu(n, &head->track_notifier_list, node,
-                                 srcu_read_lock_held(&head->track_srcu))
-               if (n->track_flush_slot)
-                       n->track_flush_slot(kvm, slot, n);
-       srcu_read_unlock(&head->track_srcu, idx);
-}
-
-/*
  * Notify external page track nodes that a memory region is being removed from
  * the VM, e.g. so that users can free any associated metadata.
  */