/*
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* Based on the x86 implementation.
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*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/perf_event.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_emulate.h>
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static int kvm_is_in_guest(void)
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{
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return kvm_arm_get_running_vcpu() != NULL;
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}
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static int kvm_is_user_mode(void)
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{
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struct kvm_vcpu *vcpu;
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vcpu = kvm_arm_get_running_vcpu();
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if (vcpu)
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return !vcpu_mode_priv(vcpu);
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return 0;
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}
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static unsigned long kvm_get_guest_ip(void)
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{
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struct kvm_vcpu *vcpu;
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vcpu = kvm_arm_get_running_vcpu();
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if (vcpu)
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return *vcpu_pc(vcpu);
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return 0;
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}
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static struct perf_guest_info_callbacks kvm_guest_cbs = {
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.is_in_guest = kvm_is_in_guest,
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.is_user_mode = kvm_is_user_mode,
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.get_guest_ip = kvm_get_guest_ip,
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};
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int kvm_perf_init(void)
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{
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return perf_register_guest_info_callbacks(&kvm_guest_cbs);
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}
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int kvm_perf_teardown(void)
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{
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return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
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}
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