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; |
32f5ff63 | 59 | unsigned int action_bits; |
5288fbf0 | 60 | |
8f2abe6a | 61 | vcpu->stat.exit_stop_request++; |
ade38c31 CH |
62 | trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits); |
63 | ||
32f5ff63 DH |
64 | action_bits = vcpu->arch.local_int.action_bits; |
65 | ||
66 | if (!(action_bits & ACTION_STOP_ON_STOP)) | |
67 | return 0; | |
9ace903d | 68 | |
32f5ff63 | 69 | if (action_bits & ACTION_STORE_ON_STOP) { |
9e0d5473 JF |
70 | rc = kvm_s390_vcpu_store_status(vcpu, |
71 | KVM_S390_STORE_STATUS_NOADDR); | |
32f5ff63 DH |
72 | if (rc) |
73 | return rc; | |
74 | } | |
75 | ||
6352e4d2 DH |
76 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
77 | kvm_s390_vcpu_stop(vcpu); | |
32f5ff63 | 78 | return -EOPNOTSUPP; |
8f2abe6a CB |
79 | } |
80 | ||
81 | static int handle_validity(struct kvm_vcpu *vcpu) | |
82 | { | |
83 | int viwhy = vcpu->arch.sie_block->ipb >> 16; | |
3edbcff9 | 84 | |
8f2abe6a | 85 | vcpu->stat.exit_validity++; |
5786fffa | 86 | trace_kvm_s390_intercept_validity(vcpu, viwhy); |
2c70fe44 CB |
87 | WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); |
88 | return -EOPNOTSUPP; | |
8f2abe6a CB |
89 | } |
90 | ||
ba5c1e9b CO |
91 | static int handle_instruction(struct kvm_vcpu *vcpu) |
92 | { | |
93 | intercept_handler_t handler; | |
94 | ||
95 | vcpu->stat.exit_instruction++; | |
5786fffa CH |
96 | trace_kvm_s390_intercept_instruction(vcpu, |
97 | vcpu->arch.sie_block->ipa, | |
98 | vcpu->arch.sie_block->ipb); | |
ba5c1e9b CO |
99 | handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; |
100 | if (handler) | |
101 | return handler(vcpu); | |
b8e660b8 | 102 | return -EOPNOTSUPP; |
ba5c1e9b CO |
103 | } |
104 | ||
439716a5 DH |
105 | static void __extract_prog_irq(struct kvm_vcpu *vcpu, |
106 | struct kvm_s390_pgm_info *pgm_info) | |
107 | { | |
108 | memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info)); | |
109 | pgm_info->code = vcpu->arch.sie_block->iprcc; | |
110 | ||
111 | switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) { | |
112 | case PGM_AFX_TRANSLATION: | |
113 | case PGM_ASX_TRANSLATION: | |
114 | case PGM_EX_TRANSLATION: | |
115 | case PGM_LFX_TRANSLATION: | |
116 | case PGM_LSTE_SEQUENCE: | |
117 | case PGM_LSX_TRANSLATION: | |
118 | case PGM_LX_TRANSLATION: | |
119 | case PGM_PRIMARY_AUTHORITY: | |
120 | case PGM_SECONDARY_AUTHORITY: | |
121 | case PGM_SPACE_SWITCH: | |
122 | pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; | |
123 | break; | |
124 | case PGM_ALEN_TRANSLATION: | |
125 | case PGM_ALE_SEQUENCE: | |
126 | case PGM_ASTE_INSTANCE: | |
127 | case PGM_ASTE_SEQUENCE: | |
128 | case PGM_ASTE_VALIDITY: | |
129 | case PGM_EXTENDED_AUTHORITY: | |
130 | pgm_info->exc_access_id = vcpu->arch.sie_block->eai; | |
131 | break; | |
132 | case PGM_ASCE_TYPE: | |
133 | case PGM_PAGE_TRANSLATION: | |
134 | case PGM_REGION_FIRST_TRANS: | |
135 | case PGM_REGION_SECOND_TRANS: | |
136 | case PGM_REGION_THIRD_TRANS: | |
137 | case PGM_SEGMENT_TRANSLATION: | |
138 | pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; | |
139 | pgm_info->exc_access_id = vcpu->arch.sie_block->eai; | |
140 | pgm_info->op_access_id = vcpu->arch.sie_block->oai; | |
141 | break; | |
142 | case PGM_MONITOR: | |
143 | pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn; | |
144 | pgm_info->mon_code = vcpu->arch.sie_block->tecmc; | |
145 | break; | |
146 | case PGM_DATA: | |
147 | pgm_info->data_exc_code = vcpu->arch.sie_block->dxc; | |
148 | break; | |
149 | case PGM_PROTECTION: | |
150 | pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; | |
151 | pgm_info->exc_access_id = vcpu->arch.sie_block->eai; | |
152 | break; | |
153 | default: | |
154 | break; | |
155 | } | |
156 | ||
157 | if (vcpu->arch.sie_block->iprcc & PGM_PER) { | |
158 | pgm_info->per_code = vcpu->arch.sie_block->perc; | |
159 | pgm_info->per_atmid = vcpu->arch.sie_block->peratmid; | |
160 | pgm_info->per_address = vcpu->arch.sie_block->peraddr; | |
161 | pgm_info->per_access_id = vcpu->arch.sie_block->peraid; | |
162 | } | |
163 | } | |
164 | ||
e325fe69 MM |
165 | /* |
166 | * restore ITDB to program-interruption TDB in guest lowcore | |
167 | * and set TX abort indication if required | |
168 | */ | |
169 | static int handle_itdb(struct kvm_vcpu *vcpu) | |
170 | { | |
171 | struct kvm_s390_itdb *itdb; | |
172 | int rc; | |
173 | ||
174 | if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) | |
175 | return 0; | |
176 | if (current->thread.per_flags & PER_FLAG_NO_TE) | |
177 | return 0; | |
178 | itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; | |
179 | rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); | |
180 | if (rc) | |
181 | return rc; | |
182 | memset(itdb, 0, sizeof(*itdb)); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
27291e21 DH |
187 | #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) |
188 | ||
ba5c1e9b CO |
189 | static int handle_prog(struct kvm_vcpu *vcpu) |
190 | { | |
439716a5 | 191 | struct kvm_s390_pgm_info pgm_info; |
684135e0 | 192 | psw_t psw; |
0040e7d2 HC |
193 | int rc; |
194 | ||
ba5c1e9b | 195 | vcpu->stat.exit_program_interruption++; |
7feb6bb8 | 196 | |
27291e21 DH |
197 | if (guestdbg_enabled(vcpu) && per_event(vcpu)) { |
198 | kvm_s390_handle_per_event(vcpu); | |
199 | /* the interrupt might have been filtered out completely */ | |
200 | if (vcpu->arch.sie_block->iprcc == 0) | |
201 | return 0; | |
202 | } | |
203 | ||
e325fe69 | 204 | trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); |
684135e0 TH |
205 | if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) { |
206 | rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t)); | |
207 | if (rc) | |
208 | return rc; | |
209 | /* Avoid endless loops of specification exceptions */ | |
210 | if (!is_valid_psw(&psw)) | |
211 | return -EOPNOTSUPP; | |
212 | } | |
e325fe69 | 213 | rc = handle_itdb(vcpu); |
0040e7d2 HC |
214 | if (rc) |
215 | return rc; | |
439716a5 | 216 | |
e325fe69 | 217 | __extract_prog_irq(vcpu, &pgm_info); |
439716a5 | 218 | return kvm_s390_inject_prog_irq(vcpu, &pgm_info); |
ba5c1e9b CO |
219 | } |
220 | ||
221 | static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) | |
222 | { | |
223 | int rc, rc2; | |
224 | ||
225 | vcpu->stat.exit_instr_and_program++; | |
226 | rc = handle_instruction(vcpu); | |
227 | rc2 = handle_prog(vcpu); | |
228 | ||
b8e660b8 | 229 | if (rc == -EOPNOTSUPP) |
ba5c1e9b CO |
230 | vcpu->arch.sie_block->icptcode = 0x04; |
231 | if (rc) | |
232 | return rc; | |
233 | return rc2; | |
234 | } | |
235 | ||
f14d82e0 TH |
236 | /** |
237 | * handle_external_interrupt - used for external interruption interceptions | |
238 | * | |
239 | * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if | |
240 | * the new PSW does not have external interrupts disabled. In the first case, | |
241 | * we've got to deliver the interrupt manually, and in the second case, we | |
242 | * drop to userspace to handle the situation there. | |
243 | */ | |
244 | static int handle_external_interrupt(struct kvm_vcpu *vcpu) | |
245 | { | |
246 | u16 eic = vcpu->arch.sie_block->eic; | |
247 | struct kvm_s390_interrupt irq; | |
248 | psw_t newpsw; | |
249 | int rc; | |
250 | ||
251 | vcpu->stat.exit_external_interrupt++; | |
252 | ||
253 | rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t)); | |
254 | if (rc) | |
255 | return rc; | |
256 | /* We can not handle clock comparator or timer interrupt with bad PSW */ | |
257 | if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) && | |
258 | (newpsw.mask & PSW_MASK_EXT)) | |
259 | return -EOPNOTSUPP; | |
260 | ||
261 | switch (eic) { | |
262 | case EXT_IRQ_CLK_COMP: | |
263 | irq.type = KVM_S390_INT_CLOCK_COMP; | |
264 | break; | |
265 | case EXT_IRQ_CPU_TIMER: | |
266 | irq.type = KVM_S390_INT_CPU_TIMER; | |
267 | break; | |
268 | case EXT_IRQ_EXTERNAL_CALL: | |
4953919f DH |
269 | if (kvm_s390_si_ext_call_pending(vcpu)) |
270 | return 0; | |
f14d82e0 TH |
271 | irq.type = KVM_S390_INT_EXTERNAL_CALL; |
272 | irq.parm = vcpu->arch.sie_block->extcpuaddr; | |
273 | break; | |
274 | default: | |
275 | return -EOPNOTSUPP; | |
276 | } | |
277 | ||
278 | return kvm_s390_inject_vcpu(vcpu, &irq); | |
279 | } | |
280 | ||
9a558ee3 TH |
281 | /** |
282 | * Handle MOVE PAGE partial execution interception. | |
283 | * | |
284 | * This interception can only happen for guests with DAT disabled and | |
285 | * addresses that are currently not mapped in the host. Thus we try to | |
286 | * set up the mappings for the corresponding user pages here (or throw | |
287 | * addressing exceptions in case of illegal guest addresses). | |
288 | */ | |
289 | static int handle_mvpg_pei(struct kvm_vcpu *vcpu) | |
290 | { | |
9a558ee3 | 291 | psw_t *psw = &vcpu->arch.sie_block->gpsw; |
f22166dc | 292 | unsigned long srcaddr, dstaddr; |
9a558ee3 TH |
293 | int reg1, reg2, rc; |
294 | ||
295 | kvm_s390_get_regs_rre(vcpu, ®1, ®2); | |
9a558ee3 TH |
296 | |
297 | /* Make sure that the source is paged-in */ | |
f22166dc TH |
298 | srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]); |
299 | if (kvm_is_error_gpa(vcpu->kvm, srcaddr)) | |
9a558ee3 | 300 | return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
f22166dc TH |
301 | rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0); |
302 | if (rc != 0) | |
9a558ee3 TH |
303 | return rc; |
304 | ||
305 | /* Make sure that the destination is paged-in */ | |
f22166dc TH |
306 | dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]); |
307 | if (kvm_is_error_gpa(vcpu->kvm, dstaddr)) | |
9a558ee3 | 308 | return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
f22166dc TH |
309 | rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1); |
310 | if (rc != 0) | |
9a558ee3 TH |
311 | return rc; |
312 | ||
313 | psw->addr = __rewind_psw(*psw, 4); | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static int handle_partial_execution(struct kvm_vcpu *vcpu) | |
319 | { | |
320 | if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */ | |
321 | return handle_mvpg_pei(vcpu); | |
4953919f DH |
322 | if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ |
323 | return kvm_s390_handle_sigp_pei(vcpu); | |
9a558ee3 TH |
324 | |
325 | return -EOPNOTSUPP; | |
326 | } | |
327 | ||
062d5e9b | 328 | static const intercept_handler_t intercept_funcs[] = { |
8f2abe6a | 329 | [0x00 >> 2] = handle_noop, |
ba5c1e9b CO |
330 | [0x04 >> 2] = handle_instruction, |
331 | [0x08 >> 2] = handle_prog, | |
332 | [0x0C >> 2] = handle_instruction_and_prog, | |
8f2abe6a | 333 | [0x10 >> 2] = handle_noop, |
f14d82e0 | 334 | [0x14 >> 2] = handle_external_interrupt, |
fa6b7fe9 | 335 | [0x18 >> 2] = handle_noop, |
ba5c1e9b | 336 | [0x1C >> 2] = kvm_s390_handle_wait, |
8f2abe6a CB |
337 | [0x20 >> 2] = handle_validity, |
338 | [0x28 >> 2] = handle_stop, | |
9a558ee3 | 339 | [0x38 >> 2] = handle_partial_execution, |
8f2abe6a CB |
340 | }; |
341 | ||
342 | int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) | |
343 | { | |
344 | intercept_handler_t func; | |
345 | u8 code = vcpu->arch.sie_block->icptcode; | |
346 | ||
062d5e9b | 347 | if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs)) |
b8e660b8 | 348 | return -EOPNOTSUPP; |
8f2abe6a CB |
349 | func = intercept_funcs[code >> 2]; |
350 | if (func) | |
351 | return func(vcpu); | |
b8e660b8 | 352 | return -EOPNOTSUPP; |
8f2abe6a | 353 | } |