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c4b1afd0 MZ |
1 | /* |
2 | * Copyright (C) 2012,2013 - ARM Ltd | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * Derived from arch/arm/kvm/handle_exit.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/kvm.h> | |
23 | #include <linux/kvm_host.h> | |
c6d01a94 | 24 | |
221905ab MZ |
25 | #include <kvm/arm_psci.h> |
26 | ||
c6d01a94 | 27 | #include <asm/esr.h> |
9d8415d6 | 28 | #include <asm/kvm_asm.h> |
c4b1afd0 | 29 | #include <asm/kvm_coproc.h> |
c6d01a94 | 30 | #include <asm/kvm_emulate.h> |
c4b1afd0 | 31 | #include <asm/kvm_mmu.h> |
e70dce73 | 32 | #include <asm/debug-monitors.h> |
c4b1afd0 | 33 | |
0d97f884 WH |
34 | #define CREATE_TRACE_POINTS |
35 | #include "trace.h" | |
36 | ||
c4b1afd0 MZ |
37 | typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); |
38 | ||
39 | static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
40 | { | |
e8e7fcc5 AP |
41 | int ret; |
42 | ||
f6be563a | 43 | trace_kvm_hvc_arm64(*vcpu_pc(vcpu), vcpu_get_reg(vcpu, 0), |
0d97f884 | 44 | kvm_vcpu_hvc_get_imm(vcpu)); |
b19e6892 | 45 | vcpu->stat.hvc_exit_stat++; |
0d97f884 | 46 | |
e8e7fcc5 AP |
47 | ret = kvm_psci_call(vcpu); |
48 | if (ret < 0) { | |
acfb3b88 | 49 | vcpu_set_reg(vcpu, 0, ~0UL); |
dcd2e40c | 50 | return 1; |
e8e7fcc5 | 51 | } |
dcd2e40c | 52 | |
e8e7fcc5 | 53 | return ret; |
c4b1afd0 MZ |
54 | } |
55 | ||
56 | static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
57 | { | |
bcb7651d MZ |
58 | /* |
59 | * "If an SMC instruction executed at Non-secure EL1 is | |
60 | * trapped to EL2 because HCR_EL2.TSC is 1, the exception is a | |
61 | * Trap exception, not a Secure Monitor Call exception [...]" | |
62 | * | |
63 | * We need to advance the PC after the trap, as it would | |
64 | * otherwise return to the same address... | |
65 | */ | |
acfb3b88 | 66 | vcpu_set_reg(vcpu, 0, ~0UL); |
bcb7651d | 67 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); |
c4b1afd0 MZ |
68 | return 1; |
69 | } | |
70 | ||
82e0191a SP |
71 | /* |
72 | * Guest access to FP/ASIMD registers are routed to this handler only | |
73 | * when the system doesn't support FP/ASIMD. | |
74 | */ | |
75 | static int handle_no_fpsimd(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
76 | { | |
77 | kvm_inject_undefined(vcpu); | |
78 | return 1; | |
79 | } | |
80 | ||
c4b1afd0 | 81 | /** |
d241aac7 MZ |
82 | * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event |
83 | * instruction executed by a guest | |
84 | * | |
c4b1afd0 MZ |
85 | * @vcpu: the vcpu pointer |
86 | * | |
d241aac7 MZ |
87 | * WFE: Yield the CPU and come back to this vcpu when the scheduler |
88 | * decides to. | |
89 | * WFI: Simply call kvm_vcpu_block(), which will halt execution of | |
c4b1afd0 MZ |
90 | * world-switches and schedule other host processes until there is an |
91 | * incoming IRQ or FIQ to the VM. | |
92 | */ | |
d241aac7 | 93 | static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run) |
c4b1afd0 | 94 | { |
1c6007d5 | 95 | if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE) { |
0d97f884 | 96 | trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true); |
b19e6892 | 97 | vcpu->stat.wfe_exit_stat++; |
f01fbd2f | 98 | kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu)); |
0d97f884 WH |
99 | } else { |
100 | trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false); | |
b19e6892 | 101 | vcpu->stat.wfi_exit_stat++; |
d241aac7 | 102 | kvm_vcpu_block(vcpu); |
6a6d73be | 103 | kvm_clear_request(KVM_REQ_UNHALT, vcpu); |
0d97f884 | 104 | } |
d241aac7 | 105 | |
05e0127f CD |
106 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); |
107 | ||
c4b1afd0 MZ |
108 | return 1; |
109 | } | |
110 | ||
4bd611ca AB |
111 | /** |
112 | * kvm_handle_guest_debug - handle a debug exception instruction | |
113 | * | |
114 | * @vcpu: the vcpu pointer | |
115 | * @run: access to the kvm_run structure for results | |
116 | * | |
117 | * We route all debug exceptions through the same handler. If both the | |
118 | * guest and host are using the same debug facilities it will be up to | |
119 | * userspace to re-inject the correct exception for guest delivery. | |
120 | * | |
121 | * @return: 0 (while setting run->exit_reason), -1 for error | |
122 | */ | |
123 | static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
124 | { | |
125 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
126 | int ret = 0; | |
127 | ||
128 | run->exit_reason = KVM_EXIT_DEBUG; | |
129 | run->debug.arch.hsr = hsr; | |
130 | ||
561454e2 | 131 | switch (ESR_ELx_EC(hsr)) { |
834bf887 AB |
132 | case ESR_ELx_EC_WATCHPT_LOW: |
133 | run->debug.arch.far = vcpu->arch.fault.far_el2; | |
134 | /* fall through */ | |
337b99bf | 135 | case ESR_ELx_EC_SOFTSTP_LOW: |
834bf887 | 136 | case ESR_ELx_EC_BREAKPT_LOW: |
4bd611ca AB |
137 | case ESR_ELx_EC_BKPT32: |
138 | case ESR_ELx_EC_BRK64: | |
139 | break; | |
140 | default: | |
141 | kvm_err("%s: un-handled case hsr: %#08x\n", | |
142 | __func__, (unsigned int) hsr); | |
143 | ret = -1; | |
144 | break; | |
145 | } | |
146 | ||
147 | return ret; | |
148 | } | |
149 | ||
ba4dd156 MR |
150 | static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run) |
151 | { | |
152 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
153 | ||
154 | kvm_pr_unimpl("Unknown exception class: hsr: %#08x -- %s\n", | |
155 | hsr, esr_get_class_string(hsr)); | |
156 | ||
157 | kvm_inject_undefined(vcpu); | |
158 | return 1; | |
159 | } | |
160 | ||
aac45ffd DM |
161 | static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run) |
162 | { | |
163 | /* Until SVE is supported for guests: */ | |
164 | kvm_inject_undefined(vcpu); | |
165 | return 1; | |
166 | } | |
167 | ||
c4b1afd0 | 168 | static exit_handle_fn arm_exit_handlers[] = { |
ba4dd156 | 169 | [0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec, |
c6d01a94 MR |
170 | [ESR_ELx_EC_WFx] = kvm_handle_wfx, |
171 | [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32, | |
172 | [ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64, | |
173 | [ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32, | |
174 | [ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store, | |
175 | [ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64, | |
176 | [ESR_ELx_EC_HVC32] = handle_hvc, | |
177 | [ESR_ELx_EC_SMC32] = handle_smc, | |
178 | [ESR_ELx_EC_HVC64] = handle_hvc, | |
179 | [ESR_ELx_EC_SMC64] = handle_smc, | |
180 | [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, | |
aac45ffd | 181 | [ESR_ELx_EC_SVE] = handle_sve, |
c6d01a94 MR |
182 | [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, |
183 | [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, | |
337b99bf | 184 | [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug, |
834bf887 AB |
185 | [ESR_ELx_EC_WATCHPT_LOW]= kvm_handle_guest_debug, |
186 | [ESR_ELx_EC_BREAKPT_LOW]= kvm_handle_guest_debug, | |
4bd611ca AB |
187 | [ESR_ELx_EC_BKPT32] = kvm_handle_guest_debug, |
188 | [ESR_ELx_EC_BRK64] = kvm_handle_guest_debug, | |
82e0191a | 189 | [ESR_ELx_EC_FP_ASIMD] = handle_no_fpsimd, |
c4b1afd0 MZ |
190 | }; |
191 | ||
192 | static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) | |
193 | { | |
056bb5f5 | 194 | u32 hsr = kvm_vcpu_get_hsr(vcpu); |
561454e2 | 195 | u8 hsr_ec = ESR_ELx_EC(hsr); |
c4b1afd0 | 196 | |
c4b1afd0 MZ |
197 | return arm_exit_handlers[hsr_ec]; |
198 | } | |
199 | ||
7226bc2e AB |
200 | /* |
201 | * We may be single-stepping an emulated instruction. If the emulation | |
202 | * has been completed in the kernel, we can return to userspace with a | |
203 | * KVM_EXIT_DEBUG, otherwise userspace needs to complete its | |
204 | * emulation first. | |
205 | */ | |
206 | static int handle_trap_exceptions(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
207 | { | |
208 | int handled; | |
209 | ||
210 | /* | |
211 | * See ARM ARM B1.14.1: "Hyp traps on instructions | |
212 | * that fail their condition code check" | |
213 | */ | |
214 | if (!kvm_condition_valid(vcpu)) { | |
215 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
216 | handled = 1; | |
217 | } else { | |
218 | exit_handle_fn exit_handler; | |
219 | ||
220 | exit_handler = kvm_get_exit_handler(vcpu); | |
221 | handled = exit_handler(vcpu, run); | |
222 | } | |
223 | ||
224 | /* | |
225 | * kvm_arm_handle_step_debug() sets the exit_reason on the kvm_run | |
226 | * structure if we need to return to userspace. | |
227 | */ | |
228 | if (handled > 0 && kvm_arm_handle_step_debug(vcpu, run)) | |
229 | handled = 0; | |
230 | ||
231 | return handled; | |
232 | } | |
233 | ||
c4b1afd0 MZ |
234 | /* |
235 | * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on | |
236 | * proper exit to userspace. | |
237 | */ | |
238 | int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
239 | int exception_index) | |
240 | { | |
ddb3d07c MZ |
241 | if (ARM_SERROR_PENDING(exception_index)) { |
242 | u8 hsr_ec = ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu)); | |
243 | ||
244 | /* | |
245 | * HVC/SMC already have an adjusted PC, which we need | |
246 | * to correct in order to return to after having | |
247 | * injected the SError. | |
248 | */ | |
249 | if (hsr_ec == ESR_ELx_EC_HVC32 || hsr_ec == ESR_ELx_EC_HVC64 || | |
250 | hsr_ec == ESR_ELx_EC_SMC32 || hsr_ec == ESR_ELx_EC_SMC64) { | |
251 | u32 adj = kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2; | |
252 | *vcpu_pc(vcpu) -= adj; | |
253 | } | |
254 | ||
255 | kvm_inject_vabt(vcpu); | |
256 | return 1; | |
257 | } | |
258 | ||
259 | exception_index = ARM_EXCEPTION_CODE(exception_index); | |
260 | ||
c4b1afd0 MZ |
261 | switch (exception_index) { |
262 | case ARM_EXCEPTION_IRQ: | |
263 | return 1; | |
0215a6e6 MZ |
264 | case ARM_EXCEPTION_EL1_SERROR: |
265 | kvm_inject_vabt(vcpu); | |
e70dce73 AB |
266 | /* We may still need to return for single-step */ |
267 | if (!(*vcpu_cpsr(vcpu) & DBG_SPSR_SS) | |
268 | && kvm_arm_handle_step_debug(vcpu, run)) | |
269 | return 0; | |
270 | else | |
271 | return 1; | |
c4b1afd0 | 272 | case ARM_EXCEPTION_TRAP: |
7226bc2e | 273 | return handle_trap_exceptions(vcpu, run); |
c94b0cf2 JM |
274 | case ARM_EXCEPTION_HYP_GONE: |
275 | /* | |
276 | * EL2 has been reset to the hyp-stub. This happens when a guest | |
277 | * is pre-empted by kvm_reboot()'s shutdown call. | |
278 | */ | |
279 | run->exit_reason = KVM_EXIT_FAIL_ENTRY; | |
280 | return 0; | |
c4b1afd0 MZ |
281 | default: |
282 | kvm_pr_unimpl("Unsupported exception type: %d", | |
283 | exception_index); | |
284 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
285 | return 0; | |
286 | } | |
287 | } |