projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1431af36 MZ |
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_mmu.h> | |
| 23 | ||
| 24 | #include "hyp.h" | |
| 25 | ||
| 26 | /* vcpu is already in the HYP VA space */ | |
| 27 | void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu) | |
| 28 | { | |
| 29 | struct kvm *kvm = kern_hyp_va(vcpu->kvm); | |
| 30 | struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; | |
| 31 | u64 val; | |
| 32 | ||
| 33 | if (kvm->arch.timer.enabled) { | |
| 34 | timer->cntv_ctl = read_sysreg(cntv_ctl_el0); | |
| 35 | timer->cntv_cval = read_sysreg(cntv_cval_el0); | |
| 36 | } | |
| 37 | ||
| 38 | /* Disable the virtual timer */ | |
| 39 | write_sysreg(0, cntv_ctl_el0); | |
| 40 | ||
| 41 | /* Allow physical timer/counter access for the host */ | |
| 42 | val = read_sysreg(cnthctl_el2); | |
| 43 | val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN; | |
| 44 | write_sysreg(val, cnthctl_el2); | |
| 45 | ||
| 46 | /* Clear cntvoff for the host */ | |
| 47 | write_sysreg(0, cntvoff_el2); | |
| 48 | } | |
| 49 | ||
| 50 | void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu) | |
| 51 | { | |
| 52 | struct kvm *kvm = kern_hyp_va(vcpu->kvm); | |
| 53 | struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; | |
| 54 | u64 val; | |
| 55 | ||
| 56 | /* | |
| 57 | * Disallow physical timer access for the guest | |
| 58 | * Physical counter access is allowed | |
| 59 | */ | |
| 60 | val = read_sysreg(cnthctl_el2); | |
| 61 | val &= ~CNTHCTL_EL1PCEN; | |
| 62 | val |= CNTHCTL_EL1PCTEN; | |
| 63 | write_sysreg(val, cnthctl_el2); | |
| 64 | ||
| 65 | if (kvm->arch.timer.enabled) { | |
| 66 | write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2); | |
| 67 | write_sysreg(timer->cntv_cval, cntv_cval_el0); | |
| 68 | isb(); | |
| 69 | write_sysreg(timer->cntv_ctl, cntv_ctl_el0); | |
| 70 | } | |
| 71 | } |