63 строки
1.1 KiB
C
63 строки
1.1 KiB
C
// 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)
|
|
{
|
|
if (kvm_pmu_probe_pmuver() != 0xf && !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);
|
|
}
|