69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2012-2015 - ARM Ltd
|
||
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <clocksource/arm_arch_timer.h>
|
||
|
|
#include <linux/compiler.h>
|
||
|
|
#include <linux/kvm_host.h>
|
||
|
|
|
||
|
|
#include <asm/kvm_hyp.h>
|
||
|
|
|
||
|
|
/* vcpu is already in the HYP VA space */
|
||
|
|
void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
|
||
|
|
{
|
||
|
|
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
|
||
|
|
u64 val;
|
||
|
|
|
||
|
|
if (timer->enabled) {
|
||
|
|
timer->cntv_ctl = read_sysreg_el0(cntv_ctl);
|
||
|
|
timer->cntv_cval = read_sysreg_el0(cntv_cval);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Disable the virtual timer */
|
||
|
|
write_sysreg_el0(0, cntv_ctl);
|
||
|
|
|
||
|
|
/* Allow physical timer/counter access for the host */
|
||
|
|
val = read_sysreg(cnthctl_el2);
|
||
|
|
val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
|
||
|
|
write_sysreg(val, cnthctl_el2);
|
||
|
|
|
||
|
|
/* Clear cntvoff for the host */
|
||
|
|
write_sysreg(0, cntvoff_el2);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
|
||
|
|
{
|
||
|
|
struct kvm *kvm = kern_hyp_va(vcpu->kvm);
|
||
|
|
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
|
||
|
|
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);
|
||
|
|
|
||
|
|
if (timer->enabled) {
|
||
|
|
write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2);
|
||
|
|
write_sysreg_el0(timer->cntv_cval, cntv_cval);
|
||
|
|
isb();
|
||
|
|
write_sysreg_el0(timer->cntv_ctl, cntv_ctl);
|
||
|
|
}
|
||
|
|
}
|