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1/*
2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * Derived from arch/arm/kvm/reset.c
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License, version 2, as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include <linux/errno.h>
23#include <linux/kvm_host.h>
24#include <linux/kvm.h>
25#include <linux/hw_breakpoint.h>
26
27#include <kvm/arm_arch_timer.h>
28
29#include <asm/cputype.h>
30#include <asm/ptrace.h>
31#include <asm/kvm_arm.h>
32#include <asm/kvm_coproc.h>
33
34/*
35 * ARMv8 Reset Values
36 */
37static const struct kvm_regs default_regs_reset = {
38 .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT |
39 PSR_F_BIT | PSR_D_BIT),
40};
41
42static const struct kvm_regs default_regs_reset32 = {
43 .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT |
44 COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
45};
46
47static const struct kvm_irq_level default_vtimer_irq = {
48 .irq = 27,
49 .level = 1,
50};
51
52static bool cpu_has_32bit_el1(void)
53{
54 u64 pfr0;
55
56 pfr0 = read_system_reg(SYS_ID_AA64PFR0_EL1);
57 return !!(pfr0 & 0x20);
58}
59
60/**
61 * kvm_arch_dev_ioctl_check_extension
62 *
63 * We currently assume that the number of HW registers is uniform
64 * across all CPUs (see cpuinfo_sanity_check).
65 */
66int kvm_arch_dev_ioctl_check_extension(long ext)
67{
68 int r;
69
70 switch (ext) {
71 case KVM_CAP_ARM_EL1_32BIT:
72 r = cpu_has_32bit_el1();
73 break;
74 case KVM_CAP_GUEST_DEBUG_HW_BPS:
75 r = get_num_brps();
76 break;
77 case KVM_CAP_GUEST_DEBUG_HW_WPS:
78 r = get_num_wrps();
79 break;
80 case KVM_CAP_ARM_PMU_V3:
81 r = kvm_arm_support_pmu_v3();
82 break;
83 case KVM_CAP_SET_GUEST_DEBUG:
84 case KVM_CAP_VCPU_ATTRIBUTES:
85 r = 1;
86 break;
87 default:
88 r = 0;
89 }
90
91 return r;
92}
93
94/**
95 * kvm_reset_vcpu - sets core registers and sys_regs to reset value
96 * @vcpu: The VCPU pointer
97 *
98 * This function finds the right table above and sets the registers on
99 * the virtual CPU struct to their architectually defined reset
100 * values.
101 */
102int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
103{
104 const struct kvm_irq_level *cpu_vtimer_irq;
105 const struct kvm_regs *cpu_reset;
106
107 switch (vcpu->arch.target) {
108 default:
109 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
110 if (!cpu_has_32bit_el1())
111 return -EINVAL;
112 cpu_reset = &default_regs_reset32;
113 } else {
114 cpu_reset = &default_regs_reset;
115 }
116
117 cpu_vtimer_irq = &default_vtimer_irq;
118 break;
119 }
120
121 /* Reset core registers */
122 memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));
123
124 /* Reset system registers */
125 kvm_reset_sys_regs(vcpu);
126
127 /* Reset PMU */
128 kvm_pmu_vcpu_reset(vcpu);
129
130 /* Reset timer */
131 return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
132}
1/*
2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * Derived from arch/arm/kvm/reset.c
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License, version 2, as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include <linux/errno.h>
23#include <linux/kvm_host.h>
24#include <linux/kvm.h>
25
26#include <kvm/arm_arch_timer.h>
27
28#include <asm/cputype.h>
29#include <asm/ptrace.h>
30#include <asm/kvm_arm.h>
31#include <asm/kvm_coproc.h>
32
33/*
34 * ARMv8 Reset Values
35 */
36static const struct kvm_regs default_regs_reset = {
37 .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT |
38 PSR_F_BIT | PSR_D_BIT),
39};
40
41static const struct kvm_regs default_regs_reset32 = {
42 .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT |
43 COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
44};
45
46static const struct kvm_irq_level default_vtimer_irq = {
47 .irq = 27,
48 .level = 1,
49};
50
51static bool cpu_has_32bit_el1(void)
52{
53 u64 pfr0;
54
55 pfr0 = read_cpuid(ID_AA64PFR0_EL1);
56 return !!(pfr0 & 0x20);
57}
58
59int kvm_arch_dev_ioctl_check_extension(long ext)
60{
61 int r;
62
63 switch (ext) {
64 case KVM_CAP_ARM_EL1_32BIT:
65 r = cpu_has_32bit_el1();
66 break;
67 default:
68 r = 0;
69 }
70
71 return r;
72}
73
74/**
75 * kvm_reset_vcpu - sets core registers and sys_regs to reset value
76 * @vcpu: The VCPU pointer
77 *
78 * This function finds the right table above and sets the registers on
79 * the virtual CPU struct to their architectually defined reset
80 * values.
81 */
82int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
83{
84 const struct kvm_irq_level *cpu_vtimer_irq;
85 const struct kvm_regs *cpu_reset;
86
87 switch (vcpu->arch.target) {
88 default:
89 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
90 if (!cpu_has_32bit_el1())
91 return -EINVAL;
92 cpu_reset = &default_regs_reset32;
93 vcpu->arch.hcr_el2 &= ~HCR_RW;
94 } else {
95 cpu_reset = &default_regs_reset;
96 }
97
98 cpu_vtimer_irq = &default_vtimer_irq;
99 break;
100 }
101
102 /* Reset core registers */
103 memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));
104
105 /* Reset system registers */
106 kvm_reset_sys_regs(vcpu);
107
108 /* Reset timer */
109 kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
110
111 return 0;
112}