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 void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilc) 42 { 43 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; 44 45 /* Use the length of the EXECUTE instruction if necessary */ 46 if (sie_block->icptstatus & 1) { 47 ilc = (sie_block->icptstatus >> 4) & 0x6; 48 if (!ilc) 49 ilc = 4; 50 } 51 sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilc); 52 } 53 54 static int handle_noop(struct kvm_vcpu *vcpu) 55 { 56 switch (vcpu->arch.sie_block->icptcode) { 57 case 0x10: 58 vcpu->stat.exit_external_request++; 59 break; 60 default: 61 break; /* nothing */ 62 } 63 return 0; 64 } 65 66 static int handle_stop(struct kvm_vcpu *vcpu) 67 { 68 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 69 int rc = 0; 70 uint8_t flags, stop_pending; 71 72 vcpu->stat.exit_stop_request++; 73 74 /* delay the stop if any non-stop irq is pending */ 75 if (kvm_s390_vcpu_has_irq(vcpu, 1)) 76 return 0; 77 78 /* avoid races with the injection/SIGP STOP code */ 79 spin_lock(&li->lock); 80 flags = li->irq.stop.flags; 81 stop_pending = kvm_s390_is_stop_irq_pending(vcpu); 82 spin_unlock(&li->lock); 83 84 trace_kvm_s390_stop_request(stop_pending, flags); 85 if (!stop_pending) 86 return 0; 87 88 if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) { 89 rc = kvm_s390_vcpu_store_status(vcpu, 90 KVM_S390_STORE_STATUS_NOADDR); 91 if (rc) 92 return rc; 93 } 94 95 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 96 kvm_s390_vcpu_stop(vcpu); 97 return -EOPNOTSUPP; 98 } 99 100 static int handle_validity(struct kvm_vcpu *vcpu) 101 { 102 int viwhy = vcpu->arch.sie_block->ipb >> 16; 103 104 vcpu->stat.exit_validity++; 105 trace_kvm_s390_intercept_validity(vcpu, viwhy); 106 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); 107 return -EOPNOTSUPP; 108 } 109 110 static int handle_instruction(struct kvm_vcpu *vcpu) 111 { 112 intercept_handler_t handler; 113 114 vcpu->stat.exit_instruction++; 115 trace_kvm_s390_intercept_instruction(vcpu, 116 vcpu->arch.sie_block->ipa, 117 vcpu->arch.sie_block->ipb); 118 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; 119 if (handler) 120 return handler(vcpu); 121 return -EOPNOTSUPP; 122 } 123 124 static void __extract_prog_irq(struct kvm_vcpu *vcpu, 125 struct kvm_s390_pgm_info *pgm_info) 126 { 127 memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info)); 128 pgm_info->code = vcpu->arch.sie_block->iprcc; 129 130 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) { 131 case PGM_AFX_TRANSLATION: 132 case PGM_ASX_TRANSLATION: 133 case PGM_EX_TRANSLATION: 134 case PGM_LFX_TRANSLATION: 135 case PGM_LSTE_SEQUENCE: 136 case PGM_LSX_TRANSLATION: 137 case PGM_LX_TRANSLATION: 138 case PGM_PRIMARY_AUTHORITY: 139 case PGM_SECONDARY_AUTHORITY: 140 case PGM_SPACE_SWITCH: 141 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; 142 break; 143 case PGM_ALEN_TRANSLATION: 144 case PGM_ALE_SEQUENCE: 145 case PGM_ASTE_INSTANCE: 146 case PGM_ASTE_SEQUENCE: 147 case PGM_ASTE_VALIDITY: 148 case PGM_EXTENDED_AUTHORITY: 149 pgm_info->exc_access_id = vcpu->arch.sie_block->eai; 150 break; 151 case PGM_ASCE_TYPE: 152 case PGM_PAGE_TRANSLATION: 153 case PGM_REGION_FIRST_TRANS: 154 case PGM_REGION_SECOND_TRANS: 155 case PGM_REGION_THIRD_TRANS: 156 case PGM_SEGMENT_TRANSLATION: 157 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; 158 pgm_info->exc_access_id = vcpu->arch.sie_block->eai; 159 pgm_info->op_access_id = vcpu->arch.sie_block->oai; 160 break; 161 case PGM_MONITOR: 162 pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn; 163 pgm_info->mon_code = vcpu->arch.sie_block->tecmc; 164 break; 165 case PGM_VECTOR_PROCESSING: 166 case PGM_DATA: 167 pgm_info->data_exc_code = vcpu->arch.sie_block->dxc; 168 break; 169 case PGM_PROTECTION: 170 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc; 171 pgm_info->exc_access_id = vcpu->arch.sie_block->eai; 172 break; 173 default: 174 break; 175 } 176 177 if (vcpu->arch.sie_block->iprcc & PGM_PER) { 178 pgm_info->per_code = vcpu->arch.sie_block->perc; 179 pgm_info->per_atmid = vcpu->arch.sie_block->peratmid; 180 pgm_info->per_address = vcpu->arch.sie_block->peraddr; 181 pgm_info->per_access_id = vcpu->arch.sie_block->peraid; 182 } 183 } 184 185 /* 186 * restore ITDB to program-interruption TDB in guest lowcore 187 * and set TX abort indication if required 188 */ 189 static int handle_itdb(struct kvm_vcpu *vcpu) 190 { 191 struct kvm_s390_itdb *itdb; 192 int rc; 193 194 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) 195 return 0; 196 if (current->thread.per_flags & PER_FLAG_NO_TE) 197 return 0; 198 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; 199 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); 200 if (rc) 201 return rc; 202 memset(itdb, 0, sizeof(*itdb)); 203 204 return 0; 205 } 206 207 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) 208 209 static int handle_prog(struct kvm_vcpu *vcpu) 210 { 211 struct kvm_s390_pgm_info pgm_info; 212 psw_t psw; 213 int rc; 214 215 vcpu->stat.exit_program_interruption++; 216 217 if (guestdbg_enabled(vcpu) && per_event(vcpu)) { 218 kvm_s390_handle_per_event(vcpu); 219 /* the interrupt might have been filtered out completely */ 220 if (vcpu->arch.sie_block->iprcc == 0) 221 return 0; 222 } 223 224 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); 225 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) { 226 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t)); 227 if (rc) 228 return rc; 229 /* Avoid endless loops of specification exceptions */ 230 if (!is_valid_psw(&psw)) 231 return -EOPNOTSUPP; 232 } 233 rc = handle_itdb(vcpu); 234 if (rc) 235 return rc; 236 237 __extract_prog_irq(vcpu, &pgm_info); 238 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 239 } 240 241 /** 242 * handle_external_interrupt - used for external interruption interceptions 243 * 244 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if 245 * the new PSW does not have external interrupts disabled. In the first case, 246 * we've got to deliver the interrupt manually, and in the second case, we 247 * drop to userspace to handle the situation there. 248 */ 249 static int handle_external_interrupt(struct kvm_vcpu *vcpu) 250 { 251 u16 eic = vcpu->arch.sie_block->eic; 252 struct kvm_s390_irq irq; 253 psw_t newpsw; 254 int rc; 255 256 vcpu->stat.exit_external_interrupt++; 257 258 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t)); 259 if (rc) 260 return rc; 261 /* We can not handle clock comparator or timer interrupt with bad PSW */ 262 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) && 263 (newpsw.mask & PSW_MASK_EXT)) 264 return -EOPNOTSUPP; 265 266 switch (eic) { 267 case EXT_IRQ_CLK_COMP: 268 irq.type = KVM_S390_INT_CLOCK_COMP; 269 break; 270 case EXT_IRQ_CPU_TIMER: 271 irq.type = KVM_S390_INT_CPU_TIMER; 272 break; 273 case EXT_IRQ_EXTERNAL_CALL: 274 irq.type = KVM_S390_INT_EXTERNAL_CALL; 275 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr; 276 rc = kvm_s390_inject_vcpu(vcpu, &irq); 277 /* ignore if another external call is already pending */ 278 if (rc == -EBUSY) 279 return 0; 280 return rc; 281 default: 282 return -EOPNOTSUPP; 283 } 284 285 return kvm_s390_inject_vcpu(vcpu, &irq); 286 } 287 288 /** 289 * Handle MOVE PAGE partial execution interception. 290 * 291 * This interception can only happen for guests with DAT disabled and 292 * addresses that are currently not mapped in the host. Thus we try to 293 * set up the mappings for the corresponding user pages here (or throw 294 * addressing exceptions in case of illegal guest addresses). 295 */ 296 static int handle_mvpg_pei(struct kvm_vcpu *vcpu) 297 { 298 unsigned long srcaddr, dstaddr; 299 int reg1, reg2, rc; 300 301 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 302 303 /* Make sure that the source is paged-in */ 304 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2], 305 reg2, &srcaddr, 0); 306 if (rc) 307 return kvm_s390_inject_prog_cond(vcpu, rc); 308 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0); 309 if (rc != 0) 310 return rc; 311 312 /* Make sure that the destination is paged-in */ 313 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1], 314 reg1, &dstaddr, 1); 315 if (rc) 316 return kvm_s390_inject_prog_cond(vcpu, rc); 317 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1); 318 if (rc != 0) 319 return rc; 320 321 kvm_s390_rewind_psw(vcpu, 4); 322 323 return 0; 324 } 325 326 static int handle_partial_execution(struct kvm_vcpu *vcpu) 327 { 328 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */ 329 return handle_mvpg_pei(vcpu); 330 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ 331 return kvm_s390_handle_sigp_pei(vcpu); 332 333 return -EOPNOTSUPP; 334 } 335 336 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) 337 { 338 if (kvm_is_ucontrol(vcpu->kvm)) 339 return -EOPNOTSUPP; 340 341 switch (vcpu->arch.sie_block->icptcode) { 342 case 0x10: 343 case 0x18: 344 return handle_noop(vcpu); 345 case 0x04: 346 return handle_instruction(vcpu); 347 case 0x08: 348 return handle_prog(vcpu); 349 case 0x14: 350 return handle_external_interrupt(vcpu); 351 case 0x1c: 352 return kvm_s390_handle_wait(vcpu); 353 case 0x20: 354 return handle_validity(vcpu); 355 case 0x28: 356 return handle_stop(vcpu); 357 case 0x38: 358 return handle_partial_execution(vcpu); 359 default: 360 return -EOPNOTSUPP; 361 } 362 } 363