blob: 3d040741044b4142ce4c7c2f79608ac18b409c69 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_KVM_PAGE_TRACK_H
#define _ASM_X86_KVM_PAGE_TRACK_H
#include <linux/kvm_types.h>
#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
/*
* 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.
*
* @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)(gpa_t gpa, const u8 *new, int bytes,
struct kvm_page_track_notifier_node *node);
/*
* Invoked when a memory region is removed from the guest. Or in KVM
* terms, when a memslot is deleted.
*
* @gfn: base gfn of the region being removed
* @nr_pages: number of pages in the to-be-removed region
* @node: this node
*/
void (*track_remove_region)(gfn_t gfn, unsigned long nr_pages,
struct kvm_page_track_notifier_node *node);
};
int 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);
int kvm_write_track_add_gfn(struct kvm *kvm, gfn_t gfn);
int kvm_write_track_remove_gfn(struct kvm *kvm, gfn_t gfn);
#else
/*
* Allow defining a node in a structure even if page tracking is disabled, e.g.
* to play nice with testing headers via direct inclusion from the command line.
*/
struct kvm_page_track_notifier_node {};
#endif /* CONFIG_KVM_EXTERNAL_WRITE_TRACKING */
#endif
|
