1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_KVM_PAGE_TRACK_H
3 #define _ASM_X86_KVM_PAGE_TRACK_H
5 enum kvm_page_track_mode {
11 * The notifier represented by @kvm_page_track_notifier_node is linked into
12 * the head which will be notified when guest is triggering the track event.
14 * Write access on the head is protected by kvm->mmu_lock, read access
15 * is protected by track_srcu.
17 struct kvm_page_track_notifier_head {
18 struct srcu_struct track_srcu;
19 struct hlist_head track_notifier_list;
22 struct kvm_page_track_notifier_node {
23 struct hlist_node node;
26 * It is called when guest is writing the write-tracked page
27 * and write emulation is finished at that time.
29 * @vcpu: the vcpu where the write access happened.
30 * @gpa: the physical address written by guest.
31 * @new: the data was written to the address.
32 * @bytes: the written length.
35 void (*track_write)(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
36 int bytes, struct kvm_page_track_notifier_node *node);
38 * It is called when memory slot is being moved or removed
39 * users can drop write-protection for the pages in that memory slot
41 * @kvm: the kvm where memory slot being moved or removed
42 * @slot: the memory slot being moved or removed
45 void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot,
46 struct kvm_page_track_notifier_node *node);
49 int kvm_page_track_init(struct kvm *kvm);
50 void kvm_page_track_cleanup(struct kvm *kvm);
52 bool kvm_page_track_write_tracking_enabled(struct kvm *kvm);
53 int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot);
55 void kvm_page_track_free_memslot(struct kvm_memory_slot *slot);
56 int kvm_page_track_create_memslot(struct kvm *kvm,
57 struct kvm_memory_slot *slot,
58 unsigned long npages);
60 void kvm_slot_page_track_add_page(struct kvm *kvm,
61 struct kvm_memory_slot *slot, gfn_t gfn,
62 enum kvm_page_track_mode mode);
63 void kvm_slot_page_track_remove_page(struct kvm *kvm,
64 struct kvm_memory_slot *slot, gfn_t gfn,
65 enum kvm_page_track_mode mode);
66 bool kvm_slot_page_track_is_active(struct kvm *kvm,
67 const struct kvm_memory_slot *slot,
68 gfn_t gfn, enum kvm_page_track_mode mode);
71 kvm_page_track_register_notifier(struct kvm *kvm,
72 struct kvm_page_track_notifier_node *n);
74 kvm_page_track_unregister_notifier(struct kvm *kvm,
75 struct kvm_page_track_notifier_node *n);
76 void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
78 void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot);