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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 | ||
13720a56 | 22 | #include <asm/kvm_hyp.h> |
1431af36 MZ |
23 | |
24 | /* vcpu is already in the HYP VA space */ | |
25 | void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu) | |
26 | { | |
1431af36 MZ |
27 | struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; |
28 | u64 val; | |
29 | ||
41a54482 | 30 | if (timer->enabled) { |
5efe6de1 MZ |
31 | timer->cntv_ctl = read_sysreg_el0(cntv_ctl); |
32 | timer->cntv_cval = read_sysreg_el0(cntv_cval); | |
1431af36 MZ |
33 | } |
34 | ||
35 | /* Disable the virtual timer */ | |
5efe6de1 | 36 | write_sysreg_el0(0, cntv_ctl); |
1431af36 | 37 | |
488f94d7 JL |
38 | /* |
39 | * We don't need to do this for VHE since the host kernel runs in EL2 | |
40 | * with HCR_EL2.TGE ==1, which makes those bits have no impact. | |
41 | */ | |
42 | if (!has_vhe()) { | |
43 | /* Allow physical timer/counter access for the host */ | |
44 | val = read_sysreg(cnthctl_el2); | |
45 | val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN; | |
46 | write_sysreg(val, cnthctl_el2); | |
47 | } | |
1431af36 MZ |
48 | |
49 | /* Clear cntvoff for the host */ | |
50 | write_sysreg(0, cntvoff_el2); | |
51 | } | |
52 | ||
53 | void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu) | |
54 | { | |
55 | struct kvm *kvm = kern_hyp_va(vcpu->kvm); | |
56 | struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; | |
57 | u64 val; | |
58 | ||
488f94d7 JL |
59 | /* Those bits are already configured at boot on VHE-system */ |
60 | if (!has_vhe()) { | |
61 | /* | |
62 | * Disallow physical timer access for the guest | |
63 | * Physical counter access is allowed | |
64 | */ | |
65 | val = read_sysreg(cnthctl_el2); | |
66 | val &= ~CNTHCTL_EL1PCEN; | |
67 | val |= CNTHCTL_EL1PCTEN; | |
68 | write_sysreg(val, cnthctl_el2); | |
69 | } | |
1431af36 | 70 | |
41a54482 | 71 | if (timer->enabled) { |
1431af36 | 72 | write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2); |
5efe6de1 | 73 | write_sysreg_el0(timer->cntv_cval, cntv_cval); |
1431af36 | 74 | isb(); |
5efe6de1 | 75 | write_sysreg_el0(timer->cntv_ctl, cntv_ctl); |
1431af36 MZ |
76 | } |
77 | } |