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f4672752 MZ |
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> | |
834bf887 | 25 | #include <linux/hw_breakpoint.h> |
f4672752 | 26 | |
003300de MZ |
27 | #include <kvm/arm_arch_timer.h> |
28 | ||
f4672752 MZ |
29 | #include <asm/cputype.h> |
30 | #include <asm/ptrace.h> | |
31 | #include <asm/kvm_arm.h> | |
67f69197 | 32 | #include <asm/kvm_asm.h> |
f4672752 | 33 | #include <asm/kvm_coproc.h> |
67f69197 | 34 | #include <asm/kvm_mmu.h> |
f4672752 MZ |
35 | |
36 | /* | |
37 | * ARMv8 Reset Values | |
38 | */ | |
39 | static const struct kvm_regs default_regs_reset = { | |
40 | .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT | | |
41 | PSR_F_BIT | PSR_D_BIT), | |
42 | }; | |
43 | ||
0d854a60 MZ |
44 | static const struct kvm_regs default_regs_reset32 = { |
45 | .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT | | |
46 | COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT), | |
47 | }; | |
48 | ||
003300de MZ |
49 | static const struct kvm_irq_level default_vtimer_irq = { |
50 | .irq = 27, | |
51 | .level = 1, | |
52 | }; | |
53 | ||
0d854a60 MZ |
54 | static bool cpu_has_32bit_el1(void) |
55 | { | |
56 | u64 pfr0; | |
57 | ||
4db8e5ea | 58 | pfr0 = read_system_reg(SYS_ID_AA64PFR0_EL1); |
0d854a60 MZ |
59 | return !!(pfr0 & 0x20); |
60 | } | |
61 | ||
834bf887 AB |
62 | /** |
63 | * kvm_arch_dev_ioctl_check_extension | |
64 | * | |
65 | * We currently assume that the number of HW registers is uniform | |
66 | * across all CPUs (see cpuinfo_sanity_check). | |
67 | */ | |
f4672752 MZ |
68 | int kvm_arch_dev_ioctl_check_extension(long ext) |
69 | { | |
70 | int r; | |
71 | ||
72 | switch (ext) { | |
0d854a60 MZ |
73 | case KVM_CAP_ARM_EL1_32BIT: |
74 | r = cpu_has_32bit_el1(); | |
75 | break; | |
834bf887 AB |
76 | case KVM_CAP_GUEST_DEBUG_HW_BPS: |
77 | r = get_num_brps(); | |
78 | break; | |
79 | case KVM_CAP_GUEST_DEBUG_HW_WPS: | |
80 | r = get_num_wrps(); | |
81 | break; | |
808e7381 SZ |
82 | case KVM_CAP_ARM_PMU_V3: |
83 | r = kvm_arm_support_pmu_v3(); | |
84 | break; | |
834bf887 | 85 | case KVM_CAP_SET_GUEST_DEBUG: |
f577f6c2 | 86 | case KVM_CAP_VCPU_ATTRIBUTES: |
834bf887 AB |
87 | r = 1; |
88 | break; | |
f4672752 MZ |
89 | default: |
90 | r = 0; | |
91 | } | |
92 | ||
93 | return r; | |
94 | } | |
95 | ||
96 | /** | |
97 | * kvm_reset_vcpu - sets core registers and sys_regs to reset value | |
98 | * @vcpu: The VCPU pointer | |
99 | * | |
100 | * This function finds the right table above and sets the registers on | |
101 | * the virtual CPU struct to their architectually defined reset | |
102 | * values. | |
103 | */ | |
104 | int kvm_reset_vcpu(struct kvm_vcpu *vcpu) | |
105 | { | |
003300de | 106 | const struct kvm_irq_level *cpu_vtimer_irq; |
f4672752 MZ |
107 | const struct kvm_regs *cpu_reset; |
108 | ||
109 | switch (vcpu->arch.target) { | |
110 | default: | |
0d854a60 MZ |
111 | if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) { |
112 | if (!cpu_has_32bit_el1()) | |
113 | return -EINVAL; | |
114 | cpu_reset = &default_regs_reset32; | |
0d854a60 MZ |
115 | } else { |
116 | cpu_reset = &default_regs_reset; | |
117 | } | |
118 | ||
003300de | 119 | cpu_vtimer_irq = &default_vtimer_irq; |
f4672752 MZ |
120 | break; |
121 | } | |
122 | ||
123 | /* Reset core registers */ | |
124 | memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset)); | |
125 | ||
126 | /* Reset system registers */ | |
127 | kvm_reset_sys_regs(vcpu); | |
128 | ||
2aa36e98 SZ |
129 | /* Reset PMU */ |
130 | kvm_pmu_vcpu_reset(vcpu); | |
131 | ||
003300de | 132 | /* Reset timer */ |
f120cd65 | 133 | return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq); |
f4672752 | 134 | } |
67f69197 AT |
135 | |
136 | extern char __hyp_idmap_text_start[]; | |
137 | ||
c612505f | 138 | unsigned long kvm_hyp_reset_entry(void) |
67f69197 | 139 | { |
c612505f JM |
140 | if (!__kvm_cpu_uses_extended_idmap()) { |
141 | unsigned long offset; | |
142 | ||
143 | /* | |
144 | * Find the address of __kvm_hyp_reset() in the trampoline page. | |
145 | * This is present in the running page tables, and the boot page | |
146 | * tables, so we call the code here to start the trampoline | |
147 | * dance in reverse. | |
148 | */ | |
149 | offset = (unsigned long)__kvm_hyp_reset | |
150 | - ((unsigned long)__hyp_idmap_text_start & PAGE_MASK); | |
151 | ||
152 | return TRAMPOLINE_VA + offset; | |
153 | } else { | |
154 | /* | |
155 | * KVM is running with merged page tables, which don't have the | |
156 | * trampoline page mapped. We know the idmap is still mapped, | |
157 | * but can't be called into directly. Use | |
158 | * __extended_idmap_trampoline to do the call. | |
159 | */ | |
160 | return (unsigned long)kvm_ksym_ref(__extended_idmap_trampoline); | |
161 | } | |
67f69197 | 162 | } |