1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012-2015 - ARM Ltd
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 */
6
7#include <clocksource/arm_arch_timer.h>
8#include <linux/compiler.h>
9#include <linux/kvm_host.h>
10
11#include <asm/kvm_hyp.h>
12
13void __kvm_timer_set_cntvoff(u64 cntvoff)
14{
15	write_sysreg(cntvoff, cntvoff_el2);
16}
17
18/*
19 * Should only be called on non-VHE systems.
20 * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
21 */
22void __timer_disable_traps(struct kvm_vcpu *vcpu)
23{
24	u64 val;
25
26	/* Allow physical timer/counter access for the host */
27	val = read_sysreg(cnthctl_el2);
28	val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
29	write_sysreg(val, cnthctl_el2);
30}
31
32/*
33 * Should only be called on non-VHE systems.
34 * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
35 */
36void __timer_enable_traps(struct kvm_vcpu *vcpu)
37{
38	u64 val;
39
40	/*
41	 * Disallow physical timer access for the guest
42	 * Physical counter access is allowed
43	 */
44	val = read_sysreg(cnthctl_el2);
45	val &= ~CNTHCTL_EL1PCEN;
46	val |= CNTHCTL_EL1PCTEN;
47	write_sysreg(val, cnthctl_el2);
48}
49