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 */ 33 void (*track_write)(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, 34 int bytes); 35 /* 36 * It is called when memory slot is being moved or removed 37 * users can drop write-protection for the pages in that memory slot 38 * 39 * @kvm: the kvm where memory slot being moved or removed 40 * @slot: the memory slot being moved or removed 41 */ 42 void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot); 43 }; 44 45 void kvm_page_track_init(struct kvm *kvm); 46 47 void kvm_page_track_free_memslot(struct kvm_memory_slot *free, 48 struct kvm_memory_slot *dont); 49 int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, 50 unsigned long npages); 51 52 void kvm_slot_page_track_add_page(struct kvm *kvm, 53 struct kvm_memory_slot *slot, gfn_t gfn, 54 enum kvm_page_track_mode mode); 55 void kvm_slot_page_track_remove_page(struct kvm *kvm, 56 struct kvm_memory_slot *slot, gfn_t gfn, 57 enum kvm_page_track_mode mode); 58 bool kvm_page_track_is_active(struct kvm_vcpu *vcpu, gfn_t gfn, 59 enum kvm_page_track_mode mode); 60 61 void 62 kvm_page_track_register_notifier(struct kvm *kvm, 63 struct kvm_page_track_notifier_node *n); 64 void 65 kvm_page_track_unregister_notifier(struct kvm *kvm, 66 struct kvm_page_track_notifier_node *n); 67 void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, 68 int bytes); 69 void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot); 70 #endif 71