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

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  1 /*
  2  * Copyright (C) 2012-2015 - ARM Ltd
  3  * Author: Marc Zyngier <marc.zyngier@arm.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #include <clocksource/arm_arch_timer.h>
 19 #include <linux/compiler.h>
 20 #include <linux/kvm_host.h>
 21 
 22 #include <asm/kvm_hyp.h>
 23 
 24 /* vcpu is already in the HYP VA space */
 25 void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
 26 {
 27         struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
 28         u64 val;
 29 
 30         if (timer->enabled) {
 31                 timer->cntv_ctl = read_sysreg_el0(cntv_ctl);
 32                 timer->cntv_cval = read_sysreg_el0(cntv_cval);
 33         }
 34 
 35         /* Disable the virtual timer */
 36         write_sysreg_el0(0, cntv_ctl);
 37 
 38         /* Allow physical timer/counter access for the host */
 39         val = read_sysreg(cnthctl_el2);
 40         val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
 41         write_sysreg(val, cnthctl_el2);
 42 
 43         /* Clear cntvoff for the host */
 44         write_sysreg(0, cntvoff_el2);
 45 }
 46 
 47 void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
 48 {
 49         struct kvm *kvm = kern_hyp_va(vcpu->kvm);
 50         struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
 51         u64 val;
 52 
 53         /*
 54          * Disallow physical timer access for the guest
 55          * Physical counter access is allowed
 56          */
 57         val = read_sysreg(cnthctl_el2);
 58         val &= ~CNTHCTL_EL1PCEN;
 59         val |= CNTHCTL_EL1PCTEN;
 60         write_sysreg(val, cnthctl_el2);
 61 
 62         if (timer->enabled) {
 63                 write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2);
 64                 write_sysreg_el0(timer->cntv_cval, cntv_cval);
 65                 isb();
 66                 write_sysreg_el0(timer->cntv_ctl, cntv_ctl);
 67         }
 68 }
 69 

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