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#include <asm/kvm_mmu.h>
13
14void __kvm_timer_set_cntvoff(u64 cntvoff)
15{
16	write_sysreg(cntvoff, cntvoff_el2);
17}
18
19/*
20 * Should only be called on non-VHE or hVHE setups.
21 * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
22 */
23void __timer_disable_traps(struct kvm_vcpu *vcpu)
24{
25	u64 val, shift = 0;
26
27	if (has_hvhe())
28		shift = 10;
29
30	/* Allow physical timer/counter access for the host */
31	val = read_sysreg(cnthctl_el2);
32	val |= (CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN) << shift;
33	write_sysreg(val, cnthctl_el2);
34}
35
36/*
37 * Should only be called on non-VHE or hVHE setups.
38 * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
39 */
40void __timer_enable_traps(struct kvm_vcpu *vcpu)
41{
42	u64 clr = 0, set = 0;
43
44	/*
45	 * Disallow physical timer access for the guest
46	 * Physical counter access is allowed if no offset is enforced
47	 * or running protected (we don't offset anything in this case).
48	 */
49	clr = CNTHCTL_EL1PCEN;
50	if (is_protected_kvm_enabled() ||
51	    !kern_hyp_va(vcpu->kvm)->arch.timer_data.poffset)
52		set |= CNTHCTL_EL1PCTEN;
53	else
54		clr |= CNTHCTL_EL1PCTEN;
55
56	if (has_hvhe()) {
57		clr <<= 10;
58		set <<= 10;
59	}
60
61	sysreg_clear_set(cnthctl_el2, clr, set);
62}
63