Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Based on the x86 implementation.
 *
 * Copyright (C) 2012 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 */
 
#include <linux/perf_event.h>
#include <linux/kvm_host.h>
 
#include <asm/kvm_emulate.h>
 
DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
 
static int kvm_is_in_guest(void)
{
        return kvm_get_running_vcpu() != NULL;
}
 
static int kvm_is_user_mode(void)
{
<------>struct kvm_vcpu *vcpu;
 
<------>vcpu = kvm_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_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)
{
<------>/*
<------> * Check if HW_PERF_EVENTS are supported by checking the number of
<------> * hardware performance counters. This could ensure the presence of
<------> * a physical PMU and CONFIG_PERF_EVENT is selected.
<------> */
<------>if (IS_ENABLED(CONFIG_ARM_PMU) && perf_num_counters() > 0
<------><------><------><------>       && !is_protected_kvm_enabled())
<------><------>static_branch_enable(&kvm_arm_pmu_available);
 
<------>return perf_register_guest_info_callbacks(&kvm_guest_cbs);
}
 
int kvm_perf_teardown(void)
{
<------>return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
}