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
25static int kvm_is_in_guest(void)
26{
27        return kvm_arm_get_running_vcpu() != NULL;
28}
29
30static 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
42static 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
54static 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
60int kvm_perf_init(void)
61{
62	return perf_register_guest_info_callbacks(&kvm_guest_cbs);
63}
64
65int kvm_perf_teardown(void)
66{
67	return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
68}
69