Commit | Line | Data |
---|---|---|
8f2abe6a | 1 | /* |
a53c8fab | 2 | * in-kernel handling for sie intercepts |
8f2abe6a | 3 | * |
9a558ee3 | 4 | * Copyright IBM Corp. 2008, 2014 |
8f2abe6a CB |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License (version 2 only) | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * Author(s): Carsten Otte <cotte@de.ibm.com> | |
11 | * Christian Borntraeger <borntraeger@de.ibm.com> | |
12 | */ | |
13 | ||
14 | #include <linux/kvm_host.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/pagemap.h> | |
17 | ||
18 | #include <asm/kvm_host.h> | |
a86dcc24 | 19 | #include <asm/asm-offsets.h> |
f14d82e0 | 20 | #include <asm/irq.h> |
8f2abe6a CB |
21 | |
22 | #include "kvm-s390.h" | |
ba5c1e9b | 23 | #include "gaccess.h" |
5786fffa | 24 | #include "trace.h" |
ade38c31 | 25 | #include "trace-s390.h" |
ba5c1e9b | 26 | |
f379aae5 | 27 | |
77975357 | 28 | static const intercept_handler_t instruction_handlers[256] = { |
8c3f61e2 | 29 | [0x01] = kvm_s390_handle_01, |
48a3e950 | 30 | [0x82] = kvm_s390_handle_lpsw, |
e28acfea | 31 | [0x83] = kvm_s390_handle_diag, |
5288fbf0 | 32 | [0xae] = kvm_s390_handle_sigp, |
70455a36 | 33 | [0xb2] = kvm_s390_handle_b2, |
aba07508 | 34 | [0xb6] = kvm_s390_handle_stctl, |
953ed88d | 35 | [0xb7] = kvm_s390_handle_lctl, |
48a3e950 | 36 | [0xb9] = kvm_s390_handle_b9, |
bb25b9ba | 37 | [0xe5] = kvm_s390_handle_e5, |
953ed88d | 38 | [0xeb] = kvm_s390_handle_eb, |
ba5c1e9b | 39 | }; |
8f2abe6a CB |
40 | |
41 | static int handle_noop(struct kvm_vcpu *vcpu) | |
42 | { | |
43 | switch (vcpu->arch.sie_block->icptcode) { | |
0eaeafa1 CB |
44 | case 0x0: |
45 | vcpu->stat.exit_null++; | |
46 | break; | |
8f2abe6a CB |
47 | case 0x10: |
48 | vcpu->stat.exit_external_request++; | |
49 | break; | |
8f2abe6a CB |
50 | default: |
51 | break; /* nothing */ | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int handle_stop(struct kvm_vcpu *vcpu) | |
57 | { | |
9ace903d | 58 | int rc = 0; |
5288fbf0 | 59 | |
8f2abe6a | 60 | vcpu->stat.exit_stop_request++; |
5288fbf0 | 61 | spin_lock_bh(&vcpu->arch.local_int.lock); |
5288fbf0 | 62 | |
ade38c31 CH |
63 | trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits); |
64 | ||
5288fbf0 | 65 | if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) { |
6852d7b6 | 66 | kvm_s390_vcpu_stop(vcpu); |
5288fbf0 CB |
67 | vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP; |
68 | VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); | |
b8e660b8 | 69 | rc = -EOPNOTSUPP; |
9ace903d CE |
70 | } |
71 | ||
9e0d5473 JF |
72 | if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) { |
73 | vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP; | |
74 | /* store status must be called unlocked. Since local_int.lock | |
75 | * only protects local_int.* and not guest memory we can give | |
76 | * up the lock here */ | |
77 | spin_unlock_bh(&vcpu->arch.local_int.lock); | |
78 | rc = kvm_s390_vcpu_store_status(vcpu, | |
79 | KVM_S390_STORE_STATUS_NOADDR); | |
80 | if (rc >= 0) | |
81 | rc = -EOPNOTSUPP; | |
82 | } else | |
83 | spin_unlock_bh(&vcpu->arch.local_int.lock); | |
5288fbf0 | 84 | return rc; |
8f2abe6a CB |
85 | } |
86 | ||
87 | static int handle_validity(struct kvm_vcpu *vcpu) | |
88 | { | |
89 | int viwhy = vcpu->arch.sie_block->ipb >> 16; | |
3edbcff9 | 90 | |
8f2abe6a | 91 | vcpu->stat.exit_validity++; |
5786fffa | 92 | trace_kvm_s390_intercept_validity(vcpu, viwhy); |
2c70fe44 CB |
93 | WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); |
94 | return -EOPNOTSUPP; | |
8f2abe6a CB |
95 | } |
96 | ||
ba5c1e9b CO |
97 | static int handle_instruction(struct kvm_vcpu *vcpu) |
98 | { | |
99 | intercept_handler_t handler; | |
100 | ||
101 | vcpu->stat.exit_instruction++; | |
5786fffa CH |
102 | trace_kvm_s390_intercept_instruction(vcpu, |
103 | vcpu->arch.sie_block->ipa, | |
104 | vcpu->arch.sie_block->ipb); | |
ba5c1e9b CO |
105 | handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; |
106 | if (handler) | |
107 | return handler(vcpu); | |
b8e660b8 | 108 | return -EOPNOTSUPP; |
ba5c1e9b CO |
109 | } |
110 | ||
439716a5 DH |
111 | static void __extract_prog_irq(struct kvm_vcpu *vcpu, |
112 | struct kvm_s390_pgm_info *pgm_info) | |
113 | { | |
114 | memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info)); | |
115 | pgm_info->code = vcpu->arch.sie_block->iprcc; | |
116 | ||
117 | switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) { | |
118 | case PGM_AFX_TRANSLATION: | |
119 | case PGM_ASX_TRANSLATION: | |
120 | case PGM_EX_TRANSLATION: | |
121 | case PGM_LFX_TRANSLATION: | |
122 | case PGM_LSTE_SEQUENCE: | |
123 | case PGM_LSX_TRANSLATION: | |
124 | case PGM_LX_TRANSLATION: | |
125 | case PGM_PRIMARY_AUTHORITY: | |
126 | case PGM_SECONDARY_AUTHORITY: | |
127 | case PGM_SPACE_SWITCH: | |
128 | pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; | |
129 | break; | |
130 | case PGM_ALEN_TRANSLATION: | |
131 | case PGM_ALE_SEQUENCE: | |
132 | case PGM_ASTE_INSTANCE: | |
133 | case PGM_ASTE_SEQUENCE: | |
134 | case PGM_ASTE_VALIDITY: | |
135 | case PGM_EXTENDED_AUTHORITY: | |
136 | pgm_info->exc_access_id = vcpu->arch.sie_block->eai; | |
137 | break; | |
138 | case PGM_ASCE_TYPE: | |
139 | case PGM_PAGE_TRANSLATION: | |
140 | case PGM_REGION_FIRST_TRANS: | |
141 | case PGM_REGION_SECOND_TRANS: | |
142 | case PGM_REGION_THIRD_TRANS: | |
143 | case PGM_SEGMENT_TRANSLATION: | |
144 | pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; | |
145 | pgm_info->exc_access_id = vcpu->arch.sie_block->eai; | |
146 | pgm_info->op_access_id = vcpu->arch.sie_block->oai; | |
147 | break; | |
148 | case PGM_MONITOR: | |
149 | pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn; | |
150 | pgm_info->mon_code = vcpu->arch.sie_block->tecmc; | |
151 | break; | |
152 | case PGM_DATA: | |
153 | pgm_info->data_exc_code = vcpu->arch.sie_block->dxc; | |
154 | break; | |
155 | case PGM_PROTECTION: | |
156 | pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; | |
157 | pgm_info->exc_access_id = vcpu->arch.sie_block->eai; | |
158 | break; | |
159 | default: | |
160 | break; | |
161 | } | |
162 | ||
163 | if (vcpu->arch.sie_block->iprcc & PGM_PER) { | |
164 | pgm_info->per_code = vcpu->arch.sie_block->perc; | |
165 | pgm_info->per_atmid = vcpu->arch.sie_block->peratmid; | |
166 | pgm_info->per_address = vcpu->arch.sie_block->peraddr; | |
167 | pgm_info->per_access_id = vcpu->arch.sie_block->peraid; | |
168 | } | |
169 | } | |
170 | ||
e325fe69 MM |
171 | /* |
172 | * restore ITDB to program-interruption TDB in guest lowcore | |
173 | * and set TX abort indication if required | |
174 | */ | |
175 | static int handle_itdb(struct kvm_vcpu *vcpu) | |
176 | { | |
177 | struct kvm_s390_itdb *itdb; | |
178 | int rc; | |
179 | ||
180 | if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) | |
181 | return 0; | |
182 | if (current->thread.per_flags & PER_FLAG_NO_TE) | |
183 | return 0; | |
184 | itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; | |
185 | rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); | |
186 | if (rc) | |
187 | return rc; | |
188 | memset(itdb, 0, sizeof(*itdb)); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
27291e21 DH |
193 | #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) |
194 | ||
ba5c1e9b CO |
195 | static int handle_prog(struct kvm_vcpu *vcpu) |
196 | { | |
439716a5 | 197 | struct kvm_s390_pgm_info pgm_info; |
684135e0 | 198 | psw_t psw; |
0040e7d2 HC |
199 | int rc; |
200 | ||
ba5c1e9b | 201 | vcpu->stat.exit_program_interruption++; |
7feb6bb8 | 202 | |
27291e21 DH |
203 | if (guestdbg_enabled(vcpu) && per_event(vcpu)) { |
204 | kvm_s390_handle_per_event(vcpu); | |
205 | /* the interrupt might have been filtered out completely */ | |
206 | if (vcpu->arch.sie_block->iprcc == 0) | |
207 | return 0; | |
208 | } | |
209 | ||
e325fe69 | 210 | trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); |
684135e0 TH |
211 | if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) { |
212 | rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t)); | |
213 | if (rc) | |
214 | return rc; | |
215 | /* Avoid endless loops of specification exceptions */ | |
216 | if (!is_valid_psw(&psw)) | |
217 | return -EOPNOTSUPP; | |
218 | } | |
e325fe69 | 219 | rc = handle_itdb(vcpu); |
0040e7d2 HC |
220 | if (rc) |
221 | return rc; | |
439716a5 | 222 | |
e325fe69 | 223 | __extract_prog_irq(vcpu, &pgm_info); |
439716a5 | 224 | return kvm_s390_inject_prog_irq(vcpu, &pgm_info); |
ba5c1e9b CO |
225 | } |
226 | ||
227 | static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) | |
228 | { | |
229 | int rc, rc2; | |
230 | ||
231 | vcpu->stat.exit_instr_and_program++; | |
232 | rc = handle_instruction(vcpu); | |
233 | rc2 = handle_prog(vcpu); | |
234 | ||
b8e660b8 | 235 | if (rc == -EOPNOTSUPP) |
ba5c1e9b CO |
236 | vcpu->arch.sie_block->icptcode = 0x04; |
237 | if (rc) | |
238 | return rc; | |
239 | return rc2; | |
240 | } | |
241 | ||
f14d82e0 TH |
242 | /** |
243 | * handle_external_interrupt - used for external interruption interceptions | |
244 | * | |
245 | * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if | |
246 | * the new PSW does not have external interrupts disabled. In the first case, | |
247 | * we've got to deliver the interrupt manually, and in the second case, we | |
248 | * drop to userspace to handle the situation there. | |
249 | */ | |
250 | static int handle_external_interrupt(struct kvm_vcpu *vcpu) | |
251 | { | |
252 | u16 eic = vcpu->arch.sie_block->eic; | |
253 | struct kvm_s390_interrupt irq; | |
254 | psw_t newpsw; | |
255 | int rc; | |
256 | ||
257 | vcpu->stat.exit_external_interrupt++; | |
258 | ||
259 | rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t)); | |
260 | if (rc) | |
261 | return rc; | |
262 | /* We can not handle clock comparator or timer interrupt with bad PSW */ | |
263 | if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) && | |
264 | (newpsw.mask & PSW_MASK_EXT)) | |
265 | return -EOPNOTSUPP; | |
266 | ||
267 | switch (eic) { | |
268 | case EXT_IRQ_CLK_COMP: | |
269 | irq.type = KVM_S390_INT_CLOCK_COMP; | |
270 | break; | |
271 | case EXT_IRQ_CPU_TIMER: | |
272 | irq.type = KVM_S390_INT_CPU_TIMER; | |
273 | break; | |
274 | case EXT_IRQ_EXTERNAL_CALL: | |
4953919f DH |
275 | if (kvm_s390_si_ext_call_pending(vcpu)) |
276 | return 0; | |
f14d82e0 TH |
277 | irq.type = KVM_S390_INT_EXTERNAL_CALL; |
278 | irq.parm = vcpu->arch.sie_block->extcpuaddr; | |
279 | break; | |
280 | default: | |
281 | return -EOPNOTSUPP; | |
282 | } | |
283 | ||
284 | return kvm_s390_inject_vcpu(vcpu, &irq); | |
285 | } | |
286 | ||
9a558ee3 TH |
287 | /** |
288 | * Handle MOVE PAGE partial execution interception. | |
289 | * | |
290 | * This interception can only happen for guests with DAT disabled and | |
291 | * addresses that are currently not mapped in the host. Thus we try to | |
292 | * set up the mappings for the corresponding user pages here (or throw | |
293 | * addressing exceptions in case of illegal guest addresses). | |
294 | */ | |
295 | static int handle_mvpg_pei(struct kvm_vcpu *vcpu) | |
296 | { | |
9a558ee3 | 297 | psw_t *psw = &vcpu->arch.sie_block->gpsw; |
f22166dc | 298 | unsigned long srcaddr, dstaddr; |
9a558ee3 TH |
299 | int reg1, reg2, rc; |
300 | ||
301 | kvm_s390_get_regs_rre(vcpu, ®1, ®2); | |
9a558ee3 TH |
302 | |
303 | /* Make sure that the source is paged-in */ | |
f22166dc TH |
304 | srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]); |
305 | if (kvm_is_error_gpa(vcpu->kvm, srcaddr)) | |
9a558ee3 | 306 | return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
f22166dc TH |
307 | rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0); |
308 | if (rc != 0) | |
9a558ee3 TH |
309 | return rc; |
310 | ||
311 | /* Make sure that the destination is paged-in */ | |
f22166dc TH |
312 | dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]); |
313 | if (kvm_is_error_gpa(vcpu->kvm, dstaddr)) | |
9a558ee3 | 314 | return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
f22166dc TH |
315 | rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1); |
316 | if (rc != 0) | |
9a558ee3 TH |
317 | return rc; |
318 | ||
319 | psw->addr = __rewind_psw(*psw, 4); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int handle_partial_execution(struct kvm_vcpu *vcpu) | |
325 | { | |
326 | if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */ | |
327 | return handle_mvpg_pei(vcpu); | |
4953919f DH |
328 | if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ |
329 | return kvm_s390_handle_sigp_pei(vcpu); | |
9a558ee3 TH |
330 | |
331 | return -EOPNOTSUPP; | |
332 | } | |
333 | ||
062d5e9b | 334 | static const intercept_handler_t intercept_funcs[] = { |
8f2abe6a | 335 | [0x00 >> 2] = handle_noop, |
ba5c1e9b CO |
336 | [0x04 >> 2] = handle_instruction, |
337 | [0x08 >> 2] = handle_prog, | |
338 | [0x0C >> 2] = handle_instruction_and_prog, | |
8f2abe6a | 339 | [0x10 >> 2] = handle_noop, |
f14d82e0 | 340 | [0x14 >> 2] = handle_external_interrupt, |
fa6b7fe9 | 341 | [0x18 >> 2] = handle_noop, |
ba5c1e9b | 342 | [0x1C >> 2] = kvm_s390_handle_wait, |
8f2abe6a CB |
343 | [0x20 >> 2] = handle_validity, |
344 | [0x28 >> 2] = handle_stop, | |
9a558ee3 | 345 | [0x38 >> 2] = handle_partial_execution, |
8f2abe6a CB |
346 | }; |
347 | ||
348 | int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) | |
349 | { | |
350 | intercept_handler_t func; | |
351 | u8 code = vcpu->arch.sie_block->icptcode; | |
352 | ||
062d5e9b | 353 | if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs)) |
b8e660b8 | 354 | return -EOPNOTSUPP; |
8f2abe6a CB |
355 | func = intercept_funcs[code >> 2]; |
356 | if (func) | |
357 | return func(vcpu); | |
b8e660b8 | 358 | return -EOPNOTSUPP; |
8f2abe6a | 359 | } |