xref: /kernel/linux/linux-6.6/arch/x86/kvm/mmu/page_track.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_PAGE_TRACK_H
#define __KVM_X86_PAGE_TRACK_H

#include <linux/kvm_host.h>

#include <asm/kvm_page_track.h>


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_write_track_add_gfn(struct kvm *kvm, struct kvm_memory_slot *slot,
			       gfn_t gfn);
void __kvm_write_track_remove_gfn(struct kvm *kvm,
				  struct kvm_memory_slot *slot, gfn_t gfn);

bool kvm_gfn_is_write_tracked(struct kvm *kvm,
			      const struct kvm_memory_slot *slot, gfn_t gfn);

#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
int kvm_page_track_init(struct kvm *kvm);
void kvm_page_track_cleanup(struct kvm *kvm);

void __kvm_page_track_write(struct kvm *kvm, gpa_t gpa, const u8 *new, int bytes);
void kvm_page_track_delete_slot(struct kvm *kvm, struct kvm_memory_slot *slot);

static inline bool kvm_page_track_has_external_user(struct kvm *kvm)
{
	return !hlist_empty(&kvm->arch.track_notifier_head.track_notifier_list);
}
#else
static inline int kvm_page_track_init(struct kvm *kvm) { return 0; }
static inline void kvm_page_track_cleanup(struct kvm *kvm) { }

static inline void __kvm_page_track_write(struct kvm *kvm, gpa_t gpa,
					  const u8 *new, int bytes) { }
static inline void kvm_page_track_delete_slot(struct kvm *kvm,
					      struct kvm_memory_slot *slot) { }

static inline bool kvm_page_track_has_external_user(struct kvm *kvm) { return false; }

#endif /* CONFIG_KVM_EXTERNAL_WRITE_TRACKING */

static inline void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
					const u8 *new, int bytes)
{
	__kvm_page_track_write(vcpu->kvm, gpa, new, bytes);

	kvm_mmu_track_write(vcpu, gpa, new, bytes);
}

#endif /* __KVM_X86_PAGE_TRACK_H */