Commit | Line | Data |
---|---|---|
210552c1 MZ |
1 | /* |
2 | * Based on the x86 implementation. | |
3 | * | |
4 | * Copyright (C) 2012 ARM Ltd. | |
5 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/perf_event.h> | |
21 | #include <linux/kvm_host.h> | |
22 | ||
23 | #include <asm/kvm_emulate.h> | |
24 | ||
25 | static int kvm_is_in_guest(void) | |
26 | { | |
27 | return kvm_arm_get_running_vcpu() != NULL; | |
28 | } | |
29 | ||
30 | static int kvm_is_user_mode(void) | |
31 | { | |
32 | struct kvm_vcpu *vcpu; | |
33 | ||
34 | vcpu = kvm_arm_get_running_vcpu(); | |
35 | ||
36 | if (vcpu) | |
37 | return !vcpu_mode_priv(vcpu); | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | static unsigned long kvm_get_guest_ip(void) | |
43 | { | |
44 | struct kvm_vcpu *vcpu; | |
45 | ||
46 | vcpu = kvm_arm_get_running_vcpu(); | |
47 | ||
48 | if (vcpu) | |
49 | return *vcpu_pc(vcpu); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static struct perf_guest_info_callbacks kvm_guest_cbs = { | |
55 | .is_in_guest = kvm_is_in_guest, | |
56 | .is_user_mode = kvm_is_user_mode, | |
57 | .get_guest_ip = kvm_get_guest_ip, | |
58 | }; | |
59 | ||
60 | int kvm_perf_init(void) | |
61 | { | |
62 | return perf_register_guest_info_callbacks(&kvm_guest_cbs); | |
63 | } | |
64 | ||
65 | int kvm_perf_teardown(void) | |
66 | { | |
67 | return perf_unregister_guest_info_callbacks(&kvm_guest_cbs); | |
68 | } |