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 or hVHE setups. 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, 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 */ 40 void __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