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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> | |
51c1296c | 24 | #include <kvm/arm_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 | ||
3414bbff MZ |
31 | static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) |
32 | { | |
e8e7fcc5 AP |
33 | int ret; |
34 | ||
c088f8f0 CD |
35 | trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0), |
36 | kvm_vcpu_hvc_get_imm(vcpu)); | |
b19e6892 | 37 | vcpu->stat.hvc_exit_stat++; |
c088f8f0 | 38 | |
f4e7680c | 39 | ret = kvm_hvc_call_handler(vcpu); |
e8e7fcc5 AP |
40 | if (ret < 0) { |
41 | kvm_inject_undefined(vcpu); | |
3414bbff | 42 | return 1; |
e8e7fcc5 | 43 | } |
3414bbff | 44 | |
e8e7fcc5 | 45 | return ret; |
3414bbff MZ |
46 | } |
47 | ||
48 | static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
49 | { | |
3414bbff MZ |
50 | kvm_inject_undefined(vcpu); |
51 | return 1; | |
52 | } | |
53 | ||
6190920a | 54 | /** |
86ed81aa | 55 | * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests |
6190920a MZ |
56 | * @vcpu: the vcpu pointer |
57 | * @run: the kvm_run structure pointer | |
58 | * | |
86ed81aa CD |
59 | * WFE: Yield the CPU and come back to this vcpu when the scheduler |
60 | * decides to. | |
61 | * WFI: Simply call kvm_vcpu_block(), which will halt execution of | |
62 | * world-switches and schedule other host processes until there is an | |
63 | * incoming IRQ or FIQ to the VM. | |
6190920a | 64 | */ |
86ed81aa | 65 | static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run) |
6190920a | 66 | { |
924de80d AP |
67 | if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE) { |
68 | trace_kvm_wfx(*vcpu_pc(vcpu), true); | |
b19e6892 | 69 | vcpu->stat.wfe_exit_stat++; |
58d5ec8f | 70 | kvm_vcpu_on_spin(vcpu); |
924de80d AP |
71 | } else { |
72 | trace_kvm_wfx(*vcpu_pc(vcpu), false); | |
b19e6892 | 73 | vcpu->stat.wfi_exit_stat++; |
58d5ec8f | 74 | kvm_vcpu_block(vcpu); |
6a6d73be | 75 | kvm_clear_request(KVM_REQ_UNHALT, vcpu); |
924de80d | 76 | } |
58d5ec8f | 77 | |
05e0127f CD |
78 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); |
79 | ||
6190920a MZ |
80 | return 1; |
81 | } | |
82 | ||
f050fe7a MR |
83 | static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run) |
84 | { | |
85 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
86 | ||
87 | kvm_pr_unimpl("Unknown exception class: hsr: %#08x\n", | |
88 | hsr); | |
89 | ||
90 | kvm_inject_undefined(vcpu); | |
91 | return 1; | |
92 | } | |
93 | ||
3414bbff | 94 | static exit_handle_fn arm_exit_handlers[] = { |
f050fe7a | 95 | [0 ... HSR_EC_MAX] = kvm_handle_unknown_ec, |
86ed81aa | 96 | [HSR_EC_WFI] = kvm_handle_wfx, |
3414bbff MZ |
97 | [HSR_EC_CP15_32] = kvm_handle_cp15_32, |
98 | [HSR_EC_CP15_64] = kvm_handle_cp15_64, | |
661e6b02 | 99 | [HSR_EC_CP14_MR] = kvm_handle_cp14_32, |
3414bbff | 100 | [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store, |
661e6b02 | 101 | [HSR_EC_CP14_64] = kvm_handle_cp14_64, |
3414bbff MZ |
102 | [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access, |
103 | [HSR_EC_CP10_ID] = kvm_handle_cp10_id, | |
3414bbff MZ |
104 | [HSR_EC_HVC] = handle_hvc, |
105 | [HSR_EC_SMC] = handle_smc, | |
106 | [HSR_EC_IABT] = kvm_handle_guest_abort, | |
3414bbff | 107 | [HSR_EC_DABT] = kvm_handle_guest_abort, |
3414bbff MZ |
108 | }; |
109 | ||
110 | static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) | |
111 | { | |
112 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
113 | ||
3414bbff MZ |
114 | return arm_exit_handlers[hsr_ec]; |
115 | } | |
116 | ||
117 | /* | |
118 | * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on | |
119 | * proper exit to userspace. | |
120 | */ | |
121 | int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
122 | int exception_index) | |
123 | { | |
124 | exit_handle_fn exit_handler; | |
125 | ||
5d7bcf7d MZ |
126 | if (ARM_ABORT_PENDING(exception_index)) { |
127 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
128 | ||
129 | /* | |
130 | * HVC/SMC already have an adjusted PC, which we need | |
131 | * to correct in order to return to after having | |
132 | * injected the abort. | |
133 | */ | |
134 | if (hsr_ec == HSR_EC_HVC || hsr_ec == HSR_EC_SMC) { | |
135 | u32 adj = kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2; | |
136 | *vcpu_pc(vcpu) -= adj; | |
137 | } | |
138 | ||
139 | kvm_inject_vabt(vcpu); | |
140 | return 1; | |
141 | } | |
142 | ||
143 | exception_index = ARM_EXCEPTION_CODE(exception_index); | |
144 | ||
3414bbff MZ |
145 | switch (exception_index) { |
146 | case ARM_EXCEPTION_IRQ: | |
147 | return 1; | |
3414bbff MZ |
148 | case ARM_EXCEPTION_HVC: |
149 | /* | |
150 | * See ARM ARM B1.14.1: "Hyp traps on instructions | |
151 | * that fail their condition code check" | |
152 | */ | |
153 | if (!kvm_condition_valid(vcpu)) { | |
154 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
155 | return 1; | |
156 | } | |
157 | ||
158 | exit_handler = kvm_get_exit_handler(vcpu); | |
159 | ||
160 | return exit_handler(vcpu, run); | |
cc325cfc MZ |
161 | case ARM_EXCEPTION_DATA_ABORT: |
162 | kvm_inject_vabt(vcpu); | |
163 | return 1; | |
386627d8 MZ |
164 | case ARM_EXCEPTION_HYP_GONE: |
165 | /* | |
166 | * HYP has been reset to the hyp-stub. This happens | |
167 | * when a guest is pre-empted by kvm_reboot()'s | |
168 | * shutdown call. | |
169 | */ | |
170 | run->exit_reason = KVM_EXIT_FAIL_ENTRY; | |
171 | return 0; | |
3414bbff MZ |
172 | default: |
173 | kvm_pr_unimpl("Unsupported exception type: %d", | |
174 | exception_index); | |
175 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
176 | return 0; | |
177 | } | |
178 | } |