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3414bbff MZ |
1 | /* |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kvm.h> | |
20 | #include <linux/kvm_host.h> | |
21 | #include <asm/kvm_emulate.h> | |
22 | #include <asm/kvm_coproc.h> | |
23 | #include <asm/kvm_mmu.h> | |
24 | #include <asm/kvm_psci.h> | |
6190920a MZ |
25 | #include <trace/events/kvm.h> |
26 | ||
27 | #include "trace.h" | |
3414bbff MZ |
28 | |
29 | typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); | |
30 | ||
31 | static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
32 | { | |
33 | /* SVC called from Hyp mode should never get here */ | |
34 | kvm_debug("SVC called from Hyp mode shouldn't go here\n"); | |
35 | BUG(); | |
36 | return -EINVAL; /* Squash warning */ | |
37 | } | |
38 | ||
39 | static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
40 | { | |
e8e7fcc5 AP |
41 | int ret; |
42 | ||
c088f8f0 CD |
43 | trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0), |
44 | kvm_vcpu_hvc_get_imm(vcpu)); | |
45 | ||
e8e7fcc5 AP |
46 | ret = kvm_psci_call(vcpu); |
47 | if (ret < 0) { | |
48 | kvm_inject_undefined(vcpu); | |
3414bbff | 49 | return 1; |
e8e7fcc5 | 50 | } |
3414bbff | 51 | |
e8e7fcc5 | 52 | return ret; |
3414bbff MZ |
53 | } |
54 | ||
55 | static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
56 | { | |
3414bbff MZ |
57 | kvm_inject_undefined(vcpu); |
58 | return 1; | |
59 | } | |
60 | ||
61 | static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
62 | { | |
63 | /* The hypervisor should never cause aborts */ | |
64 | kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | |
65 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | |
66 | return -EFAULT; | |
67 | } | |
68 | ||
69 | static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
70 | { | |
71 | /* This is either an error in the ws. code or an external abort */ | |
72 | kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | |
73 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | |
74 | return -EFAULT; | |
75 | } | |
76 | ||
6190920a | 77 | /** |
86ed81aa | 78 | * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests |
6190920a MZ |
79 | * @vcpu: the vcpu pointer |
80 | * @run: the kvm_run structure pointer | |
81 | * | |
86ed81aa CD |
82 | * WFE: Yield the CPU and come back to this vcpu when the scheduler |
83 | * decides to. | |
84 | * WFI: Simply call kvm_vcpu_block(), which will halt execution of | |
85 | * world-switches and schedule other host processes until there is an | |
86 | * incoming IRQ or FIQ to the VM. | |
6190920a | 87 | */ |
86ed81aa | 88 | static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run) |
6190920a | 89 | { |
924de80d AP |
90 | if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE) { |
91 | trace_kvm_wfx(*vcpu_pc(vcpu), true); | |
58d5ec8f | 92 | kvm_vcpu_on_spin(vcpu); |
924de80d AP |
93 | } else { |
94 | trace_kvm_wfx(*vcpu_pc(vcpu), false); | |
58d5ec8f | 95 | kvm_vcpu_block(vcpu); |
924de80d | 96 | } |
58d5ec8f | 97 | |
05e0127f CD |
98 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); |
99 | ||
6190920a MZ |
100 | return 1; |
101 | } | |
102 | ||
3414bbff | 103 | static exit_handle_fn arm_exit_handlers[] = { |
86ed81aa | 104 | [HSR_EC_WFI] = kvm_handle_wfx, |
3414bbff MZ |
105 | [HSR_EC_CP15_32] = kvm_handle_cp15_32, |
106 | [HSR_EC_CP15_64] = kvm_handle_cp15_64, | |
107 | [HSR_EC_CP14_MR] = kvm_handle_cp14_access, | |
108 | [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store, | |
109 | [HSR_EC_CP14_64] = kvm_handle_cp14_access, | |
110 | [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access, | |
111 | [HSR_EC_CP10_ID] = kvm_handle_cp10_id, | |
112 | [HSR_EC_SVC_HYP] = handle_svc_hyp, | |
113 | [HSR_EC_HVC] = handle_hvc, | |
114 | [HSR_EC_SMC] = handle_smc, | |
115 | [HSR_EC_IABT] = kvm_handle_guest_abort, | |
116 | [HSR_EC_IABT_HYP] = handle_pabt_hyp, | |
117 | [HSR_EC_DABT] = kvm_handle_guest_abort, | |
118 | [HSR_EC_DABT_HYP] = handle_dabt_hyp, | |
119 | }; | |
120 | ||
121 | static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) | |
122 | { | |
123 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
124 | ||
125 | if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || | |
126 | !arm_exit_handlers[hsr_ec]) { | |
8546dc1d | 127 | kvm_err("Unknown exception class: hsr: %#08x\n", |
3414bbff MZ |
128 | (unsigned int)kvm_vcpu_get_hsr(vcpu)); |
129 | BUG(); | |
130 | } | |
131 | ||
132 | return arm_exit_handlers[hsr_ec]; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on | |
137 | * proper exit to userspace. | |
138 | */ | |
139 | int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
140 | int exception_index) | |
141 | { | |
142 | exit_handle_fn exit_handler; | |
143 | ||
144 | switch (exception_index) { | |
145 | case ARM_EXCEPTION_IRQ: | |
146 | return 1; | |
147 | case ARM_EXCEPTION_UNDEFINED: | |
148 | kvm_err("Undefined exception in Hyp mode at: %#08lx\n", | |
149 | kvm_vcpu_get_hyp_pc(vcpu)); | |
150 | BUG(); | |
151 | panic("KVM: Hypervisor undefined exception!\n"); | |
152 | case ARM_EXCEPTION_DATA_ABORT: | |
153 | case ARM_EXCEPTION_PREF_ABORT: | |
154 | case ARM_EXCEPTION_HVC: | |
155 | /* | |
156 | * See ARM ARM B1.14.1: "Hyp traps on instructions | |
157 | * that fail their condition code check" | |
158 | */ | |
159 | if (!kvm_condition_valid(vcpu)) { | |
160 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
161 | return 1; | |
162 | } | |
163 | ||
164 | exit_handler = kvm_get_exit_handler(vcpu); | |
165 | ||
166 | return exit_handler(vcpu, run); | |
167 | default: | |
168 | kvm_pr_unimpl("Unsupported exception type: %d", | |
169 | exception_index); | |
170 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
171 | return 0; | |
172 | } | |
173 | } |