[PATCH v2 3/3] KVM: x86: Remove the unused page track hook track_flush_slot

Yan Zhao
2022-11-11T10:58:14Z

There's no users of hook track_remove_slot any more and no external page
tracker user cares about slot flush.
So remove this hook.

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.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 046b024d1813..4f1d3c91fdc7 100644
--- a/arch/x86/include/asm/kvm_page_track.h
+++ b/arch/x86/include/asm/kvm_page_track.h
@@ -34,16 +34,6 @@ struct kvm_page_track_notifier_node {
*/
void (*track_write)(struct kvm_vcpu *vcpu, 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);
/*
* It is called when memory slot is moved or removed
* users can drop write-protection for the pages in that memory slot
@@ -85,6 +75,5 @@ 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_remove_slot(struct kvm *kvm, struct kvm_memory_slot *slot);
#endif
diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 4d6bab1d61c9..f783aea618f8 100644
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -275,32 +275,6 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
srcu_read_unlock(&head->track_srcu, idx);
}

-/*
- * 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 the node that memory slot is removed or moved so that it can
* drop write-protection for the pages in the memory slot.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a24a4a2ad1a0..260288f4d741 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12872,8 +12872,6 @@ 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)
--
2.17.1