arch/sw_64/kvm/perf.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Performance events support for KVM.
 */

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

#include <asm/kvm_emulate.h>

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->arch.regs.ps & 8) != 0;

	return 0;
}

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

	vcpu = kvm_get_running_vcpu();

	if (vcpu)
		return vcpu->arch.regs.pc;
	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_sw64_perf_init(void)
{
	return perf_register_guest_info_callbacks(&kvm_guest_cbs);
}

int kvm_sw64_perf_teardown(void)
{
	return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
}