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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 | 28 | |
c088f8f0 CD |
29 | #include "trace.h" |
30 | ||
3414bbff MZ |
31 | typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); |
32 | ||
33 | static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
34 | { | |
35 | /* SVC called from Hyp mode should never get here */ | |
36 | kvm_debug("SVC called from Hyp mode shouldn't go here\n"); | |
37 | BUG(); | |
38 | return -EINVAL; /* Squash warning */ | |
39 | } | |
40 | ||
41 | static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
42 | { | |
c088f8f0 CD |
43 | trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0), |
44 | kvm_vcpu_hvc_get_imm(vcpu)); | |
45 | ||
3414bbff MZ |
46 | if (kvm_psci_call(vcpu)) |
47 | return 1; | |
48 | ||
49 | kvm_inject_undefined(vcpu); | |
50 | return 1; | |
51 | } | |
52 | ||
53 | static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
54 | { | |
3414bbff MZ |
55 | kvm_inject_undefined(vcpu); |
56 | return 1; | |
57 | } | |
58 | ||
59 | static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
60 | { | |
61 | /* The hypervisor should never cause aborts */ | |
62 | kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | |
63 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | |
64 | return -EFAULT; | |
65 | } | |
66 | ||
67 | static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
68 | { | |
69 | /* This is either an error in the ws. code or an external abort */ | |
70 | kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | |
71 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | |
72 | return -EFAULT; | |
73 | } | |
74 | ||
6190920a MZ |
75 | /** |
76 | * kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest | |
77 | * @vcpu: the vcpu pointer | |
78 | * @run: the kvm_run structure pointer | |
79 | * | |
80 | * Simply sets the wait_for_interrupts flag on the vcpu structure, which will | |
81 | * halt execution of world-switches and schedule other host processes until | |
82 | * there is an incoming IRQ or FIQ to the VM. | |
83 | */ | |
84 | static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
85 | { | |
86 | trace_kvm_wfi(*vcpu_pc(vcpu)); | |
58d5ec8f MZ |
87 | if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE) |
88 | kvm_vcpu_on_spin(vcpu); | |
89 | else | |
90 | kvm_vcpu_block(vcpu); | |
91 | ||
6190920a MZ |
92 | return 1; |
93 | } | |
94 | ||
3414bbff MZ |
95 | static exit_handle_fn arm_exit_handlers[] = { |
96 | [HSR_EC_WFI] = kvm_handle_wfi, | |
97 | [HSR_EC_CP15_32] = kvm_handle_cp15_32, | |
98 | [HSR_EC_CP15_64] = kvm_handle_cp15_64, | |
99 | [HSR_EC_CP14_MR] = kvm_handle_cp14_access, | |
100 | [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store, | |
101 | [HSR_EC_CP14_64] = kvm_handle_cp14_access, | |
102 | [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access, | |
103 | [HSR_EC_CP10_ID] = kvm_handle_cp10_id, | |
104 | [HSR_EC_SVC_HYP] = handle_svc_hyp, | |
105 | [HSR_EC_HVC] = handle_hvc, | |
106 | [HSR_EC_SMC] = handle_smc, | |
107 | [HSR_EC_IABT] = kvm_handle_guest_abort, | |
108 | [HSR_EC_IABT_HYP] = handle_pabt_hyp, | |
109 | [HSR_EC_DABT] = kvm_handle_guest_abort, | |
110 | [HSR_EC_DABT_HYP] = handle_dabt_hyp, | |
111 | }; | |
112 | ||
113 | static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) | |
114 | { | |
115 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
116 | ||
117 | if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || | |
118 | !arm_exit_handlers[hsr_ec]) { | |
8546dc1d | 119 | kvm_err("Unknown exception class: hsr: %#08x\n", |
3414bbff MZ |
120 | (unsigned int)kvm_vcpu_get_hsr(vcpu)); |
121 | BUG(); | |
122 | } | |
123 | ||
124 | return arm_exit_handlers[hsr_ec]; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on | |
129 | * proper exit to userspace. | |
130 | */ | |
131 | int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
132 | int exception_index) | |
133 | { | |
134 | exit_handle_fn exit_handler; | |
135 | ||
136 | switch (exception_index) { | |
137 | case ARM_EXCEPTION_IRQ: | |
138 | return 1; | |
139 | case ARM_EXCEPTION_UNDEFINED: | |
140 | kvm_err("Undefined exception in Hyp mode at: %#08lx\n", | |
141 | kvm_vcpu_get_hyp_pc(vcpu)); | |
142 | BUG(); | |
143 | panic("KVM: Hypervisor undefined exception!\n"); | |
144 | case ARM_EXCEPTION_DATA_ABORT: | |
145 | case ARM_EXCEPTION_PREF_ABORT: | |
146 | case ARM_EXCEPTION_HVC: | |
147 | /* | |
148 | * See ARM ARM B1.14.1: "Hyp traps on instructions | |
149 | * that fail their condition code check" | |
150 | */ | |
151 | if (!kvm_condition_valid(vcpu)) { | |
152 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
153 | return 1; | |
154 | } | |
155 | ||
156 | exit_handler = kvm_get_exit_handler(vcpu); | |
157 | ||
158 | return exit_handler(vcpu, run); | |
159 | default: | |
160 | kvm_pr_unimpl("Unsupported exception type: %d", | |
161 | exception_index); | |
162 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
163 | return 0; | |
164 | } | |
165 | } |