80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_KVM_PAGE_TRACK_H
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#define _ASM_X86_KVM_PAGE_TRACK_H
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enum kvm_page_track_mode {
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KVM_PAGE_TRACK_WRITE,
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KVM_PAGE_TRACK_MAX,
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};
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/*
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* The notifier represented by @kvm_page_track_notifier_node is linked into
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* the head which will be notified when guest is triggering the track event.
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*
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* Write access on the head is protected by kvm->mmu_lock, read access
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* is protected by track_srcu.
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*/
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struct kvm_page_track_notifier_head {
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struct srcu_struct track_srcu;
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struct hlist_head track_notifier_list;
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};
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struct kvm_page_track_notifier_node {
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struct hlist_node node;
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/*
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* It is called when guest is writing the write-tracked page
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* and write emulation is finished at that time.
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*
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* @vcpu: the vcpu where the write access happened.
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* @gpa: the physical address written by guest.
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* @new: the data was written to the address.
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* @bytes: the written length.
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* @node: this node
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*/
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void (*track_write)(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
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int bytes, struct kvm_page_track_notifier_node *node);
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/*
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* It is called when memory slot is being moved or removed
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* users can drop write-protection for the pages in that memory slot
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*
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* @kvm: the kvm where memory slot being moved or removed
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* @slot: the memory slot being moved or removed
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* @node: this node
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*/
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void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot,
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struct kvm_page_track_notifier_node *node);
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};
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int kvm_page_track_init(struct kvm *kvm);
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void kvm_page_track_cleanup(struct kvm *kvm);
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bool kvm_page_track_write_tracking_enabled(struct kvm *kvm);
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int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot);
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void kvm_page_track_free_memslot(struct kvm_memory_slot *slot);
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int kvm_page_track_create_memslot(struct kvm *kvm,
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struct kvm_memory_slot *slot,
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unsigned long npages);
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void kvm_slot_page_track_add_page(struct kvm *kvm,
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struct kvm_memory_slot *slot, gfn_t gfn,
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enum kvm_page_track_mode mode);
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void kvm_slot_page_track_remove_page(struct kvm *kvm,
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struct kvm_memory_slot *slot, gfn_t gfn,
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enum kvm_page_track_mode mode);
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bool kvm_slot_page_track_is_active(struct kvm *kvm,
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const struct kvm_memory_slot *slot,
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gfn_t gfn, enum kvm_page_track_mode mode);
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void
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kvm_page_track_register_notifier(struct kvm *kvm,
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struct kvm_page_track_notifier_node *n);
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void
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kvm_page_track_unregister_notifier(struct kvm *kvm,
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struct kvm_page_track_notifier_node *n);
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void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
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int bytes);
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void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot);
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#endif
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