1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Based on the x86 implementation.
 4 *
 5 * Copyright (C) 2012 ARM Ltd.
 6 * Author: Marc Zyngier <marc.zyngier@arm.com>
 7 */
 8
 9#include <linux/perf_event.h>
10#include <linux/kvm_host.h>
11
12#include <asm/kvm_emulate.h>
13
14static int kvm_is_in_guest(void)
15{
16        return kvm_arm_get_running_vcpu() != NULL;
17}
18
19static int kvm_is_user_mode(void)
20{
21	struct kvm_vcpu *vcpu;
22
23	vcpu = kvm_arm_get_running_vcpu();
24
25	if (vcpu)
26		return !vcpu_mode_priv(vcpu);
27
28	return 0;
29}
30
31static unsigned long kvm_get_guest_ip(void)
32{
33	struct kvm_vcpu *vcpu;
34
35	vcpu = kvm_arm_get_running_vcpu();
36
37	if (vcpu)
38		return *vcpu_pc(vcpu);
39
40	return 0;
41}
42
43static struct perf_guest_info_callbacks kvm_guest_cbs = {
44	.is_in_guest	= kvm_is_in_guest,
45	.is_user_mode	= kvm_is_user_mode,
46	.get_guest_ip	= kvm_get_guest_ip,
47};
48
49int kvm_perf_init(void)
50{
51	return perf_register_guest_info_callbacks(&kvm_guest_cbs);
52}
53
54int kvm_perf_teardown(void)
55{
56	return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
57}