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In preparation for implementing in-place hugepage promotion, various functions will need to be called from zap_collapsible_spte_range, which has the const qualifier on its memslot argument. Propagate the const qualifier to the various functions which will be needed. This just serves to simplify the following patch. No functional change intended. Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20211115234603.2908381-11-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/* 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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