69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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/* vcpu is already in the HYP VA space */
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void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
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{
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struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
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u64 val;
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if (timer->enabled) {
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timer->cntv_ctl = read_sysreg_el0(cntv_ctl);
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timer->cntv_cval = read_sysreg_el0(cntv_cval);
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}
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/* Disable the virtual timer */
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write_sysreg_el0(0, cntv_ctl);
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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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/* Clear cntvoff for the host */
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write_sysreg(0, cntvoff_el2);
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}
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void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = kern_hyp_va(vcpu->kvm);
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struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
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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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if (timer->enabled) {
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write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2);
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write_sysreg_el0(timer->cntv_cval, cntv_cval);
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isb();
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write_sysreg_el0(timer->cntv_ctl, cntv_ctl);
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}
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}
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