[mirror_ubuntu-zesty-kernel.git] / arch / arm / kvm / perf.c

/*
 * Based on the x86 implementation.
 *
 * Copyright (C) 2012 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/perf_event.h>
#include <linux/kvm_host.h>

#include <asm/kvm_emulate.h>

static int kvm_is_in_guest(void)
{
        return kvm_arm_get_running_vcpu() != NULL;
}

static int kvm_is_user_mode(void)
{
	struct kvm_vcpu *vcpu;

	vcpu = kvm_arm_get_running_vcpu();

	if (vcpu)
		return !vcpu_mode_priv(vcpu);

	return 0;
}

static unsigned long kvm_get_guest_ip(void)
{
	struct kvm_vcpu *vcpu;

	vcpu = kvm_arm_get_running_vcpu();

	if (vcpu)
		return *vcpu_pc(vcpu);

	return 0;
}

static struct perf_guest_info_callbacks kvm_guest_cbs = {
	.is_in_guest	= kvm_is_in_guest,
	.is_user_mode	= kvm_is_user_mode,
	.get_guest_ip	= kvm_get_guest_ip,
};

int kvm_perf_init(void)
{
	return perf_register_guest_info_callbacks(&kvm_guest_cbs);
}

int kvm_perf_teardown(void)
{
	return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
}
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	}