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 | 40 | |
0e8bc06a | 41 | u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu) |
04b41acd TH |
42 | { |
43 | struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; | |
0e8bc06a | 44 | u8 ilen = 0; |
04b41acd | 45 | |
0e8bc06a DH |
46 | switch (vcpu->arch.sie_block->icptcode) { |
47 | case ICPT_INST: | |
48 | case ICPT_INSTPROGI: | |
49 | case ICPT_OPEREXC: | |
50 | case ICPT_PARTEXEC: | |
51 | case ICPT_IOINST: | |
52 | /* instruction only stored for these icptcodes */ | |
53 | ilen = insn_length(vcpu->arch.sie_block->ipa >> 8); | |
54 | /* Use the length of the EXECUTE instruction if necessary */ | |
55 | if (sie_block->icptstatus & 1) { | |
56 | ilen = (sie_block->icptstatus >> 4) & 0x6; | |
57 | if (!ilen) | |
58 | ilen = 4; | |
59 | } | |
60 | break; | |
61 | case ICPT_PROGI: | |
62 | /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */ | |
63 | ilen = vcpu->arch.sie_block->pgmilc & 0x6; | |
64 | break; | |
04b41acd | 65 | } |
0e8bc06a | 66 | return ilen; |
04b41acd TH |
67 | } |
68 | ||
8f2abe6a CB |
69 | static int handle_noop(struct kvm_vcpu *vcpu) |
70 | { | |
71 | switch (vcpu->arch.sie_block->icptcode) { | |
72 | case 0x10: | |
73 | vcpu->stat.exit_external_request++; | |
74 | break; | |
8f2abe6a CB |
75 | default: |
76 | break; /* nothing */ | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int handle_stop(struct kvm_vcpu *vcpu) | |
82 | { | |
6cddd432 | 83 | struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
9ace903d | 84 | int rc = 0; |
6cddd432 | 85 | uint8_t flags, stop_pending; |
5288fbf0 | 86 | |
8f2abe6a | 87 | vcpu->stat.exit_stop_request++; |
ade38c31 | 88 | |
9a022067 DH |
89 | /* delay the stop if any non-stop irq is pending */ |
90 | if (kvm_s390_vcpu_has_irq(vcpu, 1)) | |
91 | return 0; | |
92 | ||
6cddd432 DH |
93 | /* avoid races with the injection/SIGP STOP code */ |
94 | spin_lock(&li->lock); | |
95 | flags = li->irq.stop.flags; | |
96 | stop_pending = kvm_s390_is_stop_irq_pending(vcpu); | |
97 | spin_unlock(&li->lock); | |
32f5ff63 | 98 | |
6cddd432 DH |
99 | trace_kvm_s390_stop_request(stop_pending, flags); |
100 | if (!stop_pending) | |
32f5ff63 | 101 | return 0; |
9ace903d | 102 | |
6cddd432 | 103 | if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) { |
9e0d5473 JF |
104 | rc = kvm_s390_vcpu_store_status(vcpu, |
105 | KVM_S390_STORE_STATUS_NOADDR); | |
32f5ff63 DH |
106 | if (rc) |
107 | return rc; | |
108 | } | |
109 | ||
6352e4d2 DH |
110 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
111 | kvm_s390_vcpu_stop(vcpu); | |
32f5ff63 | 112 | return -EOPNOTSUPP; |
8f2abe6a CB |
113 | } |
114 | ||
115 | static int handle_validity(struct kvm_vcpu *vcpu) | |
116 | { | |
117 | int viwhy = vcpu->arch.sie_block->ipb >> 16; | |
3edbcff9 | 118 | |
8f2abe6a | 119 | vcpu->stat.exit_validity++; |
5786fffa | 120 | trace_kvm_s390_intercept_validity(vcpu, viwhy); |
2c70fe44 CB |
121 | WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); |
122 | return -EOPNOTSUPP; | |
8f2abe6a CB |
123 | } |
124 | ||
ba5c1e9b CO |
125 | static int handle_instruction(struct kvm_vcpu *vcpu) |
126 | { | |
127 | intercept_handler_t handler; | |
128 | ||
129 | vcpu->stat.exit_instruction++; | |
5786fffa CH |
130 | trace_kvm_s390_intercept_instruction(vcpu, |
131 | vcpu->arch.sie_block->ipa, | |
132 | vcpu->arch.sie_block->ipb); | |
ba5c1e9b CO |
133 | handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; |
134 | if (handler) | |
135 | return handler(vcpu); | |
b8e660b8 | 136 | return -EOPNOTSUPP; |
ba5c1e9b CO |
137 | } |
138 | ||
f6af84e7 | 139 | static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu) |
439716a5 | 140 | { |
f6af84e7 DH |
141 | struct kvm_s390_pgm_info pgm_info = { |
142 | .code = vcpu->arch.sie_block->iprcc, | |
eaa4f416 DH |
143 | /* the PSW has already been rewound */ |
144 | .flags = KVM_S390_PGM_FLAGS_NO_REWIND, | |
f6af84e7 | 145 | }; |
439716a5 DH |
146 | |
147 | switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) { | |
148 | case PGM_AFX_TRANSLATION: | |
149 | case PGM_ASX_TRANSLATION: | |
150 | case PGM_EX_TRANSLATION: | |
151 | case PGM_LFX_TRANSLATION: | |
152 | case PGM_LSTE_SEQUENCE: | |
153 | case PGM_LSX_TRANSLATION: | |
154 | case PGM_LX_TRANSLATION: | |
155 | case PGM_PRIMARY_AUTHORITY: | |
156 | case PGM_SECONDARY_AUTHORITY: | |
157 | case PGM_SPACE_SWITCH: | |
f6af84e7 | 158 | pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
439716a5 DH |
159 | break; |
160 | case PGM_ALEN_TRANSLATION: | |
161 | case PGM_ALE_SEQUENCE: | |
162 | case PGM_ASTE_INSTANCE: | |
163 | case PGM_ASTE_SEQUENCE: | |
164 | case PGM_ASTE_VALIDITY: | |
165 | case PGM_EXTENDED_AUTHORITY: | |
f6af84e7 | 166 | pgm_info.exc_access_id = vcpu->arch.sie_block->eai; |
439716a5 DH |
167 | break; |
168 | case PGM_ASCE_TYPE: | |
169 | case PGM_PAGE_TRANSLATION: | |
170 | case PGM_REGION_FIRST_TRANS: | |
171 | case PGM_REGION_SECOND_TRANS: | |
172 | case PGM_REGION_THIRD_TRANS: | |
173 | case PGM_SEGMENT_TRANSLATION: | |
f6af84e7 DH |
174 | pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
175 | pgm_info.exc_access_id = vcpu->arch.sie_block->eai; | |
176 | pgm_info.op_access_id = vcpu->arch.sie_block->oai; | |
439716a5 DH |
177 | break; |
178 | case PGM_MONITOR: | |
f6af84e7 DH |
179 | pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn; |
180 | pgm_info.mon_code = vcpu->arch.sie_block->tecmc; | |
439716a5 | 181 | break; |
403c8648 | 182 | case PGM_VECTOR_PROCESSING: |
439716a5 | 183 | case PGM_DATA: |
f6af84e7 | 184 | pgm_info.data_exc_code = vcpu->arch.sie_block->dxc; |
439716a5 DH |
185 | break; |
186 | case PGM_PROTECTION: | |
f6af84e7 DH |
187 | pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
188 | pgm_info.exc_access_id = vcpu->arch.sie_block->eai; | |
439716a5 DH |
189 | break; |
190 | default: | |
191 | break; | |
192 | } | |
193 | ||
194 | if (vcpu->arch.sie_block->iprcc & PGM_PER) { | |
f6af84e7 DH |
195 | pgm_info.per_code = vcpu->arch.sie_block->perc; |
196 | pgm_info.per_atmid = vcpu->arch.sie_block->peratmid; | |
197 | pgm_info.per_address = vcpu->arch.sie_block->peraddr; | |
198 | pgm_info.per_access_id = vcpu->arch.sie_block->peraid; | |
439716a5 | 199 | } |
f6af84e7 | 200 | return kvm_s390_inject_prog_irq(vcpu, &pgm_info); |
439716a5 DH |
201 | } |
202 | ||
e325fe69 MM |
203 | /* |
204 | * restore ITDB to program-interruption TDB in guest lowcore | |
205 | * and set TX abort indication if required | |
206 | */ | |
207 | static int handle_itdb(struct kvm_vcpu *vcpu) | |
208 | { | |
209 | struct kvm_s390_itdb *itdb; | |
210 | int rc; | |
211 | ||
212 | if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) | |
213 | return 0; | |
214 | if (current->thread.per_flags & PER_FLAG_NO_TE) | |
215 | return 0; | |
216 | itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; | |
217 | rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); | |
218 | if (rc) | |
219 | return rc; | |
220 | memset(itdb, 0, sizeof(*itdb)); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
27291e21 DH |
225 | #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) |
226 | ||
ba5c1e9b CO |
227 | static int handle_prog(struct kvm_vcpu *vcpu) |
228 | { | |
684135e0 | 229 | psw_t psw; |
0040e7d2 HC |
230 | int rc; |
231 | ||
ba5c1e9b | 232 | vcpu->stat.exit_program_interruption++; |
7feb6bb8 | 233 | |
27291e21 DH |
234 | if (guestdbg_enabled(vcpu) && per_event(vcpu)) { |
235 | kvm_s390_handle_per_event(vcpu); | |
236 | /* the interrupt might have been filtered out completely */ | |
237 | if (vcpu->arch.sie_block->iprcc == 0) | |
238 | return 0; | |
239 | } | |
240 | ||
e325fe69 | 241 | trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); |
684135e0 TH |
242 | if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) { |
243 | rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t)); | |
244 | if (rc) | |
245 | return rc; | |
246 | /* Avoid endless loops of specification exceptions */ | |
247 | if (!is_valid_psw(&psw)) | |
248 | return -EOPNOTSUPP; | |
249 | } | |
e325fe69 | 250 | rc = handle_itdb(vcpu); |
0040e7d2 HC |
251 | if (rc) |
252 | return rc; | |
439716a5 | 253 | |
f6af84e7 | 254 | return inject_prog_on_prog_intercept(vcpu); |
ba5c1e9b CO |
255 | } |
256 | ||
f14d82e0 TH |
257 | /** |
258 | * handle_external_interrupt - used for external interruption interceptions | |
259 | * | |
260 | * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if | |
261 | * the new PSW does not have external interrupts disabled. In the first case, | |
262 | * we've got to deliver the interrupt manually, and in the second case, we | |
263 | * drop to userspace to handle the situation there. | |
264 | */ | |
265 | static int handle_external_interrupt(struct kvm_vcpu *vcpu) | |
266 | { | |
267 | u16 eic = vcpu->arch.sie_block->eic; | |
383d0b05 | 268 | struct kvm_s390_irq irq; |
f14d82e0 TH |
269 | psw_t newpsw; |
270 | int rc; | |
271 | ||
272 | vcpu->stat.exit_external_interrupt++; | |
273 | ||
274 | rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t)); | |
275 | if (rc) | |
276 | return rc; | |
277 | /* We can not handle clock comparator or timer interrupt with bad PSW */ | |
278 | if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) && | |
279 | (newpsw.mask & PSW_MASK_EXT)) | |
280 | return -EOPNOTSUPP; | |
281 | ||
282 | switch (eic) { | |
283 | case EXT_IRQ_CLK_COMP: | |
284 | irq.type = KVM_S390_INT_CLOCK_COMP; | |
285 | break; | |
286 | case EXT_IRQ_CPU_TIMER: | |
287 | irq.type = KVM_S390_INT_CPU_TIMER; | |
288 | break; | |
289 | case EXT_IRQ_EXTERNAL_CALL: | |
290 | irq.type = KVM_S390_INT_EXTERNAL_CALL; | |
383d0b05 | 291 | irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr; |
ea5f4969 DH |
292 | rc = kvm_s390_inject_vcpu(vcpu, &irq); |
293 | /* ignore if another external call is already pending */ | |
294 | if (rc == -EBUSY) | |
295 | return 0; | |
296 | return rc; | |
f14d82e0 TH |
297 | default: |
298 | return -EOPNOTSUPP; | |
299 | } | |
300 | ||
301 | return kvm_s390_inject_vcpu(vcpu, &irq); | |
302 | } | |
303 | ||
9a558ee3 TH |
304 | /** |
305 | * Handle MOVE PAGE partial execution interception. | |
306 | * | |
307 | * This interception can only happen for guests with DAT disabled and | |
308 | * addresses that are currently not mapped in the host. Thus we try to | |
309 | * set up the mappings for the corresponding user pages here (or throw | |
310 | * addressing exceptions in case of illegal guest addresses). | |
311 | */ | |
312 | static int handle_mvpg_pei(struct kvm_vcpu *vcpu) | |
313 | { | |
f22166dc | 314 | unsigned long srcaddr, dstaddr; |
9a558ee3 TH |
315 | int reg1, reg2, rc; |
316 | ||
317 | kvm_s390_get_regs_rre(vcpu, ®1, ®2); | |
9a558ee3 TH |
318 | |
319 | /* Make sure that the source is paged-in */ | |
3cfad023 | 320 | rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2], |
92c96321 | 321 | reg2, &srcaddr, GACC_FETCH); |
3cfad023 TH |
322 | if (rc) |
323 | return kvm_s390_inject_prog_cond(vcpu, rc); | |
f22166dc TH |
324 | rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0); |
325 | if (rc != 0) | |
9a558ee3 TH |
326 | return rc; |
327 | ||
328 | /* Make sure that the destination is paged-in */ | |
3cfad023 | 329 | rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1], |
92c96321 | 330 | reg1, &dstaddr, GACC_STORE); |
3cfad023 TH |
331 | if (rc) |
332 | return kvm_s390_inject_prog_cond(vcpu, rc); | |
f22166dc TH |
333 | rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1); |
334 | if (rc != 0) | |
9a558ee3 TH |
335 | return rc; |
336 | ||
0e8bc06a | 337 | kvm_s390_retry_instr(vcpu); |
9a558ee3 TH |
338 | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static int handle_partial_execution(struct kvm_vcpu *vcpu) | |
343 | { | |
344 | if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */ | |
345 | return handle_mvpg_pei(vcpu); | |
4953919f DH |
346 | if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ |
347 | return kvm_s390_handle_sigp_pei(vcpu); | |
9a558ee3 TH |
348 | |
349 | return -EOPNOTSUPP; | |
350 | } | |
351 | ||
a011eeb2 JF |
352 | static int handle_operexc(struct kvm_vcpu *vcpu) |
353 | { | |
354 | vcpu->stat.exit_operation_exception++; | |
355 | trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa, | |
356 | vcpu->arch.sie_block->ipb); | |
357 | ||
95ca2cb5 JF |
358 | if (vcpu->arch.sie_block->ipa == 0xb256 && |
359 | test_kvm_facility(vcpu->kvm, 74)) | |
360 | return handle_sthyi(vcpu); | |
361 | ||
a011eeb2 JF |
362 | return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
363 | } | |
364 | ||
8f2abe6a CB |
365 | int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) |
366 | { | |
71f116bf DH |
367 | if (kvm_is_ucontrol(vcpu->kvm)) |
368 | return -EOPNOTSUPP; | |
369 | ||
46b708ea | 370 | switch (vcpu->arch.sie_block->icptcode) { |
46b708ea CB |
371 | case 0x10: |
372 | case 0x18: | |
373 | return handle_noop(vcpu); | |
374 | case 0x04: | |
375 | return handle_instruction(vcpu); | |
376 | case 0x08: | |
377 | return handle_prog(vcpu); | |
378 | case 0x14: | |
379 | return handle_external_interrupt(vcpu); | |
380 | case 0x1c: | |
381 | return kvm_s390_handle_wait(vcpu); | |
382 | case 0x20: | |
383 | return handle_validity(vcpu); | |
384 | case 0x28: | |
385 | return handle_stop(vcpu); | |
a011eeb2 JF |
386 | case 0x2c: |
387 | return handle_operexc(vcpu); | |
46b708ea CB |
388 | case 0x38: |
389 | return handle_partial_execution(vcpu); | |
390 | default: | |
b8e660b8 | 391 | return -EOPNOTSUPP; |
46b708ea | 392 | } |
8f2abe6a | 393 | } |