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linux-next/arch/x86/include/asm/kvm_page_track.h
Sean Christopherson e96c81ee89 KVM: Simplify kvm_free_memslot() and all its descendents
Now that all callers of kvm_free_memslot() pass NULL for @dont, remove
the param from the top-level routine and all arch's implementations.

No functional change intended.

Tested-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-03-16 17:57:22 +01:00

75 lines
2.4 KiB
C

/* 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);
};
void 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