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