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/*
* 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);
}
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