Contributors: 16
Author Tokens Token Proportion Commits Commit Proportion
Xiao Guangrong 180 64.06% 3 13.04%
Avi Kivity 22 7.83% 3 13.04%
Xiaoguang Chen 18 6.41% 1 4.35%
Paolo Bonzini 15 5.34% 2 8.70%
David L Stevens 14 4.98% 2 8.70%
Takuya Yoshikawa 8 2.85% 1 4.35%
Dave Hansen 6 2.14% 1 4.35%
David Matlack 4 1.42% 1 4.35%
Jike Song 4 1.42% 1 4.35%
Ben Gardon 3 1.07% 2 8.70%
Nadav Amit 2 0.71% 1 4.35%
Gleb Natapov 1 0.36% 1 4.35%
Greg Kroah-Hartman 1 0.36% 1 4.35%
Sean Christopherson 1 0.36% 1 4.35%
Haimin Zhang 1 0.36% 1 4.35%
Junaid Shahid 1 0.36% 1 4.35%
Total 281 23 


/* 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);

bool kvm_page_track_write_tracking_enabled(struct kvm *kvm);
int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot);

void kvm_page_track_free_memslot(struct kvm_memory_slot *slot);
int kvm_page_track_create_memslot(struct kvm *kvm,
				  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_slot_page_track_is_active(struct kvm *kvm,
				   const struct kvm_memory_slot *slot,
				   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