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 14 void __kvm_timer_set_cntvoff(u64 cntvoff) 15 { 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 */ 23 void __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 */ 37 void __timer_enable_traps(struct kvm_vcpu *vcpu) 38 { 39 u64 clr = 0, set = 0; 40 41 /* 42 * Disallow physical timer access for the guest 43 * Physical counter access is allowed if no offset is enforced 44 * or running protected (we don't offset anything in this case). 45 */ 46 clr = CNTHCTL_EL1PCEN; 47 if (is_protected_kvm_enabled() || 48 !kern_hyp_va(vcpu->kvm)->arch.timer_data.poffset) 49 set |= CNTHCTL_EL1PCTEN; 50 else 51 clr |= CNTHCTL_EL1PCTEN; 52 53 sysreg_clear_set(cnthctl_el2, clr, set); 54 } 55