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