| 1 | /* |
| 2 | * in-kernel handling for sie intercepts |
| 3 | * |
| 4 | * Copyright IBM Corp. 2008, 2014 |
| 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> |
| 19 | #include <asm/asm-offsets.h> |
| 20 | #include <asm/irq.h> |
| 21 | |
| 22 | #include "kvm-s390.h" |
| 23 | #include "gaccess.h" |
| 24 | #include "trace.h" |
| 25 | #include "trace-s390.h" |
| 26 | |
| 27 | |
| 28 | static const intercept_handler_t instruction_handlers[256] = { |
| 29 | [0x01] = kvm_s390_handle_01, |
| 30 | [0x82] = kvm_s390_handle_lpsw, |
| 31 | [0x83] = kvm_s390_handle_diag, |
| 32 | [0xae] = kvm_s390_handle_sigp, |
| 33 | [0xb2] = kvm_s390_handle_b2, |
| 34 | [0xb6] = kvm_s390_handle_stctl, |
| 35 | [0xb7] = kvm_s390_handle_lctl, |
| 36 | [0xb9] = kvm_s390_handle_b9, |
| 37 | [0xe5] = kvm_s390_handle_e5, |
| 38 | [0xeb] = kvm_s390_handle_eb, |
| 39 | }; |
| 40 | |
| 41 | u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu) |
| 42 | { |
| 43 | struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; |
| 44 | u8 ilen = 0; |
| 45 | |
| 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; |
| 65 | } |
| 66 | return ilen; |
| 67 | } |
| 68 | |
| 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; |
| 75 | default: |
| 76 | break; /* nothing */ |
| 77 | } |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int handle_stop(struct kvm_vcpu *vcpu) |
| 82 | { |
| 83 | struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| 84 | int rc = 0; |
| 85 | uint8_t flags, stop_pending; |
| 86 | |
| 87 | vcpu->stat.exit_stop_request++; |
| 88 | |
| 89 | /* delay the stop if any non-stop irq is pending */ |
| 90 | if (kvm_s390_vcpu_has_irq(vcpu, 1)) |
| 91 | return 0; |
| 92 | |
| 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); |
| 98 | |
| 99 | trace_kvm_s390_stop_request(stop_pending, flags); |
| 100 | if (!stop_pending) |
| 101 | return 0; |
| 102 | |
| 103 | if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) { |
| 104 | rc = kvm_s390_vcpu_store_status(vcpu, |
| 105 | KVM_S390_STORE_STATUS_NOADDR); |
| 106 | if (rc) |
| 107 | return rc; |
| 108 | } |
| 109 | |
| 110 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
| 111 | kvm_s390_vcpu_stop(vcpu); |
| 112 | return -EOPNOTSUPP; |
| 113 | } |
| 114 | |
| 115 | static int handle_validity(struct kvm_vcpu *vcpu) |
| 116 | { |
| 117 | int viwhy = vcpu->arch.sie_block->ipb >> 16; |
| 118 | |
| 119 | vcpu->stat.exit_validity++; |
| 120 | trace_kvm_s390_intercept_validity(vcpu, viwhy); |
| 121 | WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); |
| 122 | return -EOPNOTSUPP; |
| 123 | } |
| 124 | |
| 125 | static int handle_instruction(struct kvm_vcpu *vcpu) |
| 126 | { |
| 127 | intercept_handler_t handler; |
| 128 | |
| 129 | vcpu->stat.exit_instruction++; |
| 130 | trace_kvm_s390_intercept_instruction(vcpu, |
| 131 | vcpu->arch.sie_block->ipa, |
| 132 | vcpu->arch.sie_block->ipb); |
| 133 | handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; |
| 134 | if (handler) |
| 135 | return handler(vcpu); |
| 136 | return -EOPNOTSUPP; |
| 137 | } |
| 138 | |
| 139 | static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu) |
| 140 | { |
| 141 | struct kvm_s390_pgm_info pgm_info = { |
| 142 | .code = vcpu->arch.sie_block->iprcc, |
| 143 | /* the PSW has already been rewound */ |
| 144 | .flags = KVM_S390_PGM_FLAGS_NO_REWIND, |
| 145 | }; |
| 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: |
| 158 | pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
| 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: |
| 166 | pgm_info.exc_access_id = vcpu->arch.sie_block->eai; |
| 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: |
| 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; |
| 177 | break; |
| 178 | case PGM_MONITOR: |
| 179 | pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn; |
| 180 | pgm_info.mon_code = vcpu->arch.sie_block->tecmc; |
| 181 | break; |
| 182 | case PGM_VECTOR_PROCESSING: |
| 183 | case PGM_DATA: |
| 184 | pgm_info.data_exc_code = vcpu->arch.sie_block->dxc; |
| 185 | break; |
| 186 | case PGM_PROTECTION: |
| 187 | pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
| 188 | pgm_info.exc_access_id = vcpu->arch.sie_block->eai; |
| 189 | break; |
| 190 | default: |
| 191 | break; |
| 192 | } |
| 193 | |
| 194 | if (vcpu->arch.sie_block->iprcc & PGM_PER) { |
| 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; |
| 199 | } |
| 200 | return kvm_s390_inject_prog_irq(vcpu, &pgm_info); |
| 201 | } |
| 202 | |
| 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 | |
| 225 | #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) |
| 226 | |
| 227 | static int handle_prog(struct kvm_vcpu *vcpu) |
| 228 | { |
| 229 | psw_t psw; |
| 230 | int rc; |
| 231 | |
| 232 | vcpu->stat.exit_program_interruption++; |
| 233 | |
| 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 | |
| 241 | trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); |
| 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 | } |
| 250 | rc = handle_itdb(vcpu); |
| 251 | if (rc) |
| 252 | return rc; |
| 253 | |
| 254 | return inject_prog_on_prog_intercept(vcpu); |
| 255 | } |
| 256 | |
| 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; |
| 268 | struct kvm_s390_irq irq; |
| 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; |
| 291 | irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr; |
| 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; |
| 297 | default: |
| 298 | return -EOPNOTSUPP; |
| 299 | } |
| 300 | |
| 301 | return kvm_s390_inject_vcpu(vcpu, &irq); |
| 302 | } |
| 303 | |
| 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 | { |
| 314 | unsigned long srcaddr, dstaddr; |
| 315 | int reg1, reg2, rc; |
| 316 | |
| 317 | kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| 318 | |
| 319 | /* Make sure that the source is paged-in */ |
| 320 | rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2], |
| 321 | reg2, &srcaddr, GACC_FETCH); |
| 322 | if (rc) |
| 323 | return kvm_s390_inject_prog_cond(vcpu, rc); |
| 324 | rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0); |
| 325 | if (rc != 0) |
| 326 | return rc; |
| 327 | |
| 328 | /* Make sure that the destination is paged-in */ |
| 329 | rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1], |
| 330 | reg1, &dstaddr, GACC_STORE); |
| 331 | if (rc) |
| 332 | return kvm_s390_inject_prog_cond(vcpu, rc); |
| 333 | rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1); |
| 334 | if (rc != 0) |
| 335 | return rc; |
| 336 | |
| 337 | kvm_s390_retry_instr(vcpu); |
| 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); |
| 346 | if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ |
| 347 | return kvm_s390_handle_sigp_pei(vcpu); |
| 348 | |
| 349 | return -EOPNOTSUPP; |
| 350 | } |
| 351 | |
| 352 | int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) |
| 353 | { |
| 354 | if (kvm_is_ucontrol(vcpu->kvm)) |
| 355 | return -EOPNOTSUPP; |
| 356 | |
| 357 | switch (vcpu->arch.sie_block->icptcode) { |
| 358 | case 0x10: |
| 359 | case 0x18: |
| 360 | return handle_noop(vcpu); |
| 361 | case 0x04: |
| 362 | return handle_instruction(vcpu); |
| 363 | case 0x08: |
| 364 | return handle_prog(vcpu); |
| 365 | case 0x14: |
| 366 | return handle_external_interrupt(vcpu); |
| 367 | case 0x1c: |
| 368 | return kvm_s390_handle_wait(vcpu); |
| 369 | case 0x20: |
| 370 | return handle_validity(vcpu); |
| 371 | case 0x28: |
| 372 | return handle_stop(vcpu); |
| 373 | case 0x38: |
| 374 | return handle_partial_execution(vcpu); |
| 375 | default: |
| 376 | return -EOPNOTSUPP; |
| 377 | } |
| 378 | } |