linux-kernel - [PATCH 17/27] KVM: x86: Remove the unused page-track hook track_flush

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Date:   Fri, 23 Dec 2022 00:57:29 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>
Cc:     kvm@...r.kernel.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Yan Zhao <yan.y.zhao@...el.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: [PATCH 17/27] KVM: x86: Remove the unused page-track hook track_flush_slot()

From: Yan Zhao <yan.y.zhao@...el.com>

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@...ux.intel.com>
Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/include/asm/kvm_page_track.h | 11 -----------
 arch/x86/kvm/mmu/page_track.c         | 26 --------------------------
 arch/x86/kvm/x86.c                    |  2 --
 3 files changed, 39 deletions(-)

diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
index 152c5e7d7868..e5eb98ca4fce 100644
--- 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
@@ -87,7 +77,6 @@ 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/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 959be672e2ad..d2b9f7f183cc 100644
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -277,32 +277,6 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
 	kvm_mmu_track_write(vcpu, gpa, new, bytes);
 }
 
-/*
- * 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.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cb0005e4baf0..f372c41ee2c2 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12610,8 +12610,6 @@ 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);
 }
 
 static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu)
-- 
2.39.0.314.g84b9a713c41-goog