1 #ifndef _ASM_X86_KVM_PAGE_TRACK_H 2 #define _ASM_X86_KVM_PAGE_TRACK_H 3 4 enum kvm_page_track_mode { 5 KVM_PAGE_TRACK_WRITE, 6 KVM_PAGE_TRACK_MAX, 7 }; 8 9 /* 10 * The notifier represented by @kvm_page_track_notifier_node is linked into 11 * the head which will be notified when guest is triggering the track event. 12 * 13 * Write access on the head is protected by kvm->mmu_lock, read access 14 * is protected by track_srcu. 15 */ 16 struct kvm_page_track_notifier_head { 17 struct srcu_struct track_srcu; 18 struct hlist_head track_notifier_list; 19 }; 20 21 struct kvm_page_track_notifier_node { 22 struct hlist_node node; 23 24 /* 25 * It is called when guest is writing the write-tracked page 26 * and write emulation is finished at that time. 27 * 28 * @vcpu: the vcpu where the write access happened. 29 * @gpa: the physical address written by guest. 30 * @new: the data was written to the address. 31 * @bytes: the written length. 32 * @node: this node 33 */ 34 void (*track_write)(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, 35 int bytes, struct kvm_page_track_notifier_node *node); 36 /* 37 * It is called when memory slot is being moved or removed 38 * users can drop write-protection for the pages in that memory slot 39 * 40 * @kvm: the kvm where memory slot being moved or removed 41 * @slot: the memory slot being moved or removed 42 * @node: this node 43 */ 44 void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot, 45 struct kvm_page_track_notifier_node *node); 46 }; 47 48 void kvm_page_track_init(struct kvm *kvm); 49 void kvm_page_track_cleanup(struct kvm *kvm); 50 51 void kvm_page_track_free_memslot(struct kvm_memory_slot *free, 52 struct kvm_memory_slot *dont); 53 int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, 54 unsigned long npages); 55 56 void kvm_slot_page_track_add_page(struct kvm *kvm, 57 struct kvm_memory_slot *slot, gfn_t gfn, 58 enum kvm_page_track_mode mode); 59 void kvm_slot_page_track_remove_page(struct kvm *kvm, 60 struct kvm_memory_slot *slot, gfn_t gfn, 61 enum kvm_page_track_mode mode); 62 bool kvm_page_track_is_active(struct kvm_vcpu *vcpu, gfn_t gfn, 63 enum kvm_page_track_mode mode); 64 65 void 66 kvm_page_track_register_notifier(struct kvm *kvm, 67 struct kvm_page_track_notifier_node *n); 68 void 69 kvm_page_track_unregister_notifier(struct kvm *kvm, 70 struct kvm_page_track_notifier_node *n); 71 void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, 72 int bytes); 73 void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot); 74 #endif 75