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 
__kvm_timer_set_cntvoff(u32 cntvoff_low,u32 cntvoff_high)13 void __hyp_text __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high)
14 {
15 	u64 cntvoff = (u64)cntvoff_high << 32 | cntvoff_low;
16 	write_sysreg(cntvoff, cntvoff_el2);
17 }
18 
19 /*
20  * Should only be called on non-VHE systems.
21  * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
22  */
__timer_disable_traps(struct kvm_vcpu * vcpu)23 void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
24 {
25 	u64 val;
26 
27 	/* Allow physical timer/counter access for the host */
28 	val = read_sysreg(cnthctl_el2);
29 	val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
30 	write_sysreg(val, cnthctl_el2);
31 }
32 
33 /*
34  * Should only be called on non-VHE systems.
35  * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
36  */
__timer_enable_traps(struct kvm_vcpu * vcpu)37 void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
38 {
39 	u64 val;
40 
41 	/*
42 	 * Disallow physical timer access for the guest
43 	 * Physical counter access is allowed
44 	 */
45 	val = read_sysreg(cnthctl_el2);
46 	val &= ~CNTHCTL_EL1PCEN;
47 	val |= CNTHCTL_EL1PCTEN;
48 	write_sysreg(val, cnthctl_el2);
49 }
50