root/virt/kvm/arm/hyp/timer-sr.c

DEFINITIONS

1. __kvm_timer_set_cntvoff
2. __timer_disable_traps
3. __timer_enable_traps

   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 
  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  */
  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  */
  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 }