50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012-2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*/
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#include <clocksource/arm_arch_timer.h>
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_hyp.h>
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void __hyp_text __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high)
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{
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u64 cntvoff = (u64)cntvoff_high << 32 | cntvoff_low;
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write_sysreg(cntvoff, cntvoff_el2);
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}
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/*
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* Should only be called on non-VHE systems.
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* VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
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*/
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void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
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{
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u64 val;
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/* Allow physical timer/counter access for the host */
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val = read_sysreg(cnthctl_el2);
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val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
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write_sysreg(val, cnthctl_el2);
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}
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/*
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* Should only be called on non-VHE systems.
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* VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
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*/
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void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
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{
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u64 val;
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/*
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* Disallow physical timer access for the guest
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* Physical counter access is allowed
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*/
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val = read_sysreg(cnthctl_el2);
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val &= ~CNTHCTL_EL1PCEN;
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val |= CNTHCTL_EL1PCTEN;
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write_sysreg(val, cnthctl_el2);
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}
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