1 /* 2 * handling kvm guest interrupts 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 */ 12 13 #include <linux/interrupt.h> 14 #include <linux/kvm_host.h> 15 #include <linux/hrtimer.h> 16 #include <linux/mmu_context.h> 17 #include <linux/signal.h> 18 #include <linux/slab.h> 19 #include <asm/asm-offsets.h> 20 #include <asm/uaccess.h> 21 #include "kvm-s390.h" 22 #include "gaccess.h" 23 #include "trace-s390.h" 24 25 #define IOINT_SCHID_MASK 0x0000ffff 26 #define IOINT_SSID_MASK 0x00030000 27 #define IOINT_CSSID_MASK 0x03fc0000 28 #define IOINT_AI_MASK 0x04000000 29 30 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu); 31 32 static int is_ioint(u64 type) 33 { 34 return ((type & 0xfffe0000u) != 0xfffe0000u); 35 } 36 37 int psw_extint_disabled(struct kvm_vcpu *vcpu) 38 { 39 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); 40 } 41 42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu) 43 { 44 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO); 45 } 46 47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu) 48 { 49 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK); 50 } 51 52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) 53 { 54 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) || 55 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) || 56 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT)) 57 return 0; 58 return 1; 59 } 60 61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu) 62 { 63 if (psw_extint_disabled(vcpu) || 64 !(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 65 return 0; 66 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu)) 67 /* No timer interrupts when single stepping */ 68 return 0; 69 return 1; 70 } 71 72 static u64 int_word_to_isc_bits(u32 int_word) 73 { 74 u8 isc = (int_word & 0x38000000) >> 27; 75 76 return (0x80 >> isc) << 24; 77 } 78 79 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu, 80 struct kvm_s390_interrupt_info *inti) 81 { 82 switch (inti->type) { 83 case KVM_S390_INT_EXTERNAL_CALL: 84 if (psw_extint_disabled(vcpu)) 85 return 0; 86 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul) 87 return 1; 88 case KVM_S390_INT_EMERGENCY: 89 if (psw_extint_disabled(vcpu)) 90 return 0; 91 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul) 92 return 1; 93 return 0; 94 case KVM_S390_INT_CLOCK_COMP: 95 return ckc_interrupts_enabled(vcpu); 96 case KVM_S390_INT_CPU_TIMER: 97 if (psw_extint_disabled(vcpu)) 98 return 0; 99 if (vcpu->arch.sie_block->gcr[0] & 0x400ul) 100 return 1; 101 return 0; 102 case KVM_S390_INT_SERVICE: 103 case KVM_S390_INT_PFAULT_INIT: 104 case KVM_S390_INT_PFAULT_DONE: 105 case KVM_S390_INT_VIRTIO: 106 if (psw_extint_disabled(vcpu)) 107 return 0; 108 if (vcpu->arch.sie_block->gcr[0] & 0x200ul) 109 return 1; 110 return 0; 111 case KVM_S390_PROGRAM_INT: 112 case KVM_S390_SIGP_STOP: 113 case KVM_S390_SIGP_SET_PREFIX: 114 case KVM_S390_RESTART: 115 return 1; 116 case KVM_S390_MCHK: 117 if (psw_mchk_disabled(vcpu)) 118 return 0; 119 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14) 120 return 1; 121 return 0; 122 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 123 if (psw_ioint_disabled(vcpu)) 124 return 0; 125 if (vcpu->arch.sie_block->gcr[6] & 126 int_word_to_isc_bits(inti->io.io_int_word)) 127 return 1; 128 return 0; 129 default: 130 printk(KERN_WARNING "illegal interrupt type %llx\n", 131 inti->type); 132 BUG(); 133 } 134 return 0; 135 } 136 137 static void __set_cpu_idle(struct kvm_vcpu *vcpu) 138 { 139 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 140 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 141 } 142 143 static void __unset_cpu_idle(struct kvm_vcpu *vcpu) 144 { 145 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 146 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 147 } 148 149 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) 150 { 151 atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, 152 &vcpu->arch.sie_block->cpuflags); 153 vcpu->arch.sie_block->lctl = 0x0000; 154 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT); 155 156 if (guestdbg_enabled(vcpu)) { 157 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 | 158 LCTL_CR10 | LCTL_CR11); 159 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT); 160 } 161 162 if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) 163 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags); 164 } 165 166 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) 167 { 168 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags); 169 } 170 171 static void __set_intercept_indicator(struct kvm_vcpu *vcpu, 172 struct kvm_s390_interrupt_info *inti) 173 { 174 switch (inti->type) { 175 case KVM_S390_INT_EXTERNAL_CALL: 176 case KVM_S390_INT_EMERGENCY: 177 case KVM_S390_INT_SERVICE: 178 case KVM_S390_INT_PFAULT_INIT: 179 case KVM_S390_INT_PFAULT_DONE: 180 case KVM_S390_INT_VIRTIO: 181 case KVM_S390_INT_CLOCK_COMP: 182 case KVM_S390_INT_CPU_TIMER: 183 if (psw_extint_disabled(vcpu)) 184 __set_cpuflag(vcpu, CPUSTAT_EXT_INT); 185 else 186 vcpu->arch.sie_block->lctl |= LCTL_CR0; 187 break; 188 case KVM_S390_SIGP_STOP: 189 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 190 break; 191 case KVM_S390_MCHK: 192 if (psw_mchk_disabled(vcpu)) 193 vcpu->arch.sie_block->ictl |= ICTL_LPSW; 194 else 195 vcpu->arch.sie_block->lctl |= LCTL_CR14; 196 break; 197 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 198 if (psw_ioint_disabled(vcpu)) 199 __set_cpuflag(vcpu, CPUSTAT_IO_INT); 200 else 201 vcpu->arch.sie_block->lctl |= LCTL_CR6; 202 break; 203 default: 204 BUG(); 205 } 206 } 207 208 static int __deliver_prog_irq(struct kvm_vcpu *vcpu, 209 struct kvm_s390_pgm_info *pgm_info) 210 { 211 const unsigned short table[] = { 2, 4, 4, 6 }; 212 int rc = 0; 213 214 switch (pgm_info->code & ~PGM_PER) { 215 case PGM_AFX_TRANSLATION: 216 case PGM_ASX_TRANSLATION: 217 case PGM_EX_TRANSLATION: 218 case PGM_LFX_TRANSLATION: 219 case PGM_LSTE_SEQUENCE: 220 case PGM_LSX_TRANSLATION: 221 case PGM_LX_TRANSLATION: 222 case PGM_PRIMARY_AUTHORITY: 223 case PGM_SECONDARY_AUTHORITY: 224 case PGM_SPACE_SWITCH: 225 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code, 226 (u64 *)__LC_TRANS_EXC_CODE); 227 break; 228 case PGM_ALEN_TRANSLATION: 229 case PGM_ALE_SEQUENCE: 230 case PGM_ASTE_INSTANCE: 231 case PGM_ASTE_SEQUENCE: 232 case PGM_ASTE_VALIDITY: 233 case PGM_EXTENDED_AUTHORITY: 234 rc = put_guest_lc(vcpu, pgm_info->exc_access_id, 235 (u8 *)__LC_EXC_ACCESS_ID); 236 break; 237 case PGM_ASCE_TYPE: 238 case PGM_PAGE_TRANSLATION: 239 case PGM_REGION_FIRST_TRANS: 240 case PGM_REGION_SECOND_TRANS: 241 case PGM_REGION_THIRD_TRANS: 242 case PGM_SEGMENT_TRANSLATION: 243 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code, 244 (u64 *)__LC_TRANS_EXC_CODE); 245 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id, 246 (u8 *)__LC_EXC_ACCESS_ID); 247 rc |= put_guest_lc(vcpu, pgm_info->op_access_id, 248 (u8 *)__LC_OP_ACCESS_ID); 249 break; 250 case PGM_MONITOR: 251 rc = put_guest_lc(vcpu, pgm_info->mon_class_nr, 252 (u64 *)__LC_MON_CLASS_NR); 253 rc |= put_guest_lc(vcpu, pgm_info->mon_code, 254 (u64 *)__LC_MON_CODE); 255 break; 256 case PGM_DATA: 257 rc = put_guest_lc(vcpu, pgm_info->data_exc_code, 258 (u32 *)__LC_DATA_EXC_CODE); 259 break; 260 case PGM_PROTECTION: 261 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code, 262 (u64 *)__LC_TRANS_EXC_CODE); 263 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id, 264 (u8 *)__LC_EXC_ACCESS_ID); 265 break; 266 } 267 268 if (pgm_info->code & PGM_PER) { 269 rc |= put_guest_lc(vcpu, pgm_info->per_code, 270 (u8 *) __LC_PER_CODE); 271 rc |= put_guest_lc(vcpu, pgm_info->per_atmid, 272 (u8 *)__LC_PER_ATMID); 273 rc |= put_guest_lc(vcpu, pgm_info->per_address, 274 (u64 *) __LC_PER_ADDRESS); 275 rc |= put_guest_lc(vcpu, pgm_info->per_access_id, 276 (u8 *) __LC_PER_ACCESS_ID); 277 } 278 279 switch (vcpu->arch.sie_block->icptcode) { 280 case ICPT_INST: 281 case ICPT_INSTPROGI: 282 case ICPT_OPEREXC: 283 case ICPT_PARTEXEC: 284 case ICPT_IOINST: 285 /* last instruction only stored for these icptcodes */ 286 rc |= put_guest_lc(vcpu, table[vcpu->arch.sie_block->ipa >> 14], 287 (u16 *) __LC_PGM_ILC); 288 break; 289 case ICPT_PROGI: 290 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->pgmilc, 291 (u16 *) __LC_PGM_ILC); 292 break; 293 default: 294 rc |= put_guest_lc(vcpu, 0, 295 (u16 *) __LC_PGM_ILC); 296 } 297 298 rc |= put_guest_lc(vcpu, pgm_info->code, 299 (u16 *)__LC_PGM_INT_CODE); 300 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW, 301 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 302 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW, 303 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 304 305 return rc; 306 } 307 308 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, 309 struct kvm_s390_interrupt_info *inti) 310 { 311 const unsigned short table[] = { 2, 4, 4, 6 }; 312 int rc = 0; 313 314 switch (inti->type) { 315 case KVM_S390_INT_EMERGENCY: 316 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg"); 317 vcpu->stat.deliver_emergency_signal++; 318 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 319 inti->emerg.code, 0); 320 rc = put_guest_lc(vcpu, 0x1201, (u16 *)__LC_EXT_INT_CODE); 321 rc |= put_guest_lc(vcpu, inti->emerg.code, 322 (u16 *)__LC_EXT_CPU_ADDR); 323 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 324 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 325 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 326 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 327 break; 328 case KVM_S390_INT_EXTERNAL_CALL: 329 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call"); 330 vcpu->stat.deliver_external_call++; 331 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 332 inti->extcall.code, 0); 333 rc = put_guest_lc(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE); 334 rc |= put_guest_lc(vcpu, inti->extcall.code, 335 (u16 *)__LC_EXT_CPU_ADDR); 336 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 337 &vcpu->arch.sie_block->gpsw, 338 sizeof(psw_t)); 339 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 340 &vcpu->arch.sie_block->gpsw, 341 sizeof(psw_t)); 342 break; 343 case KVM_S390_INT_CLOCK_COMP: 344 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 345 inti->ext.ext_params, 0); 346 deliver_ckc_interrupt(vcpu); 347 break; 348 case KVM_S390_INT_CPU_TIMER: 349 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 350 inti->ext.ext_params, 0); 351 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER, 352 (u16 *)__LC_EXT_INT_CODE); 353 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 354 &vcpu->arch.sie_block->gpsw, 355 sizeof(psw_t)); 356 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 357 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 358 rc |= put_guest_lc(vcpu, inti->ext.ext_params, 359 (u32 *)__LC_EXT_PARAMS); 360 break; 361 case KVM_S390_INT_SERVICE: 362 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x", 363 inti->ext.ext_params); 364 vcpu->stat.deliver_service_signal++; 365 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 366 inti->ext.ext_params, 0); 367 rc = put_guest_lc(vcpu, 0x2401, (u16 *)__LC_EXT_INT_CODE); 368 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 369 &vcpu->arch.sie_block->gpsw, 370 sizeof(psw_t)); 371 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 372 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 373 rc |= put_guest_lc(vcpu, inti->ext.ext_params, 374 (u32 *)__LC_EXT_PARAMS); 375 break; 376 case KVM_S390_INT_PFAULT_INIT: 377 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0, 378 inti->ext.ext_params2); 379 rc = put_guest_lc(vcpu, 0x2603, (u16 *) __LC_EXT_INT_CODE); 380 rc |= put_guest_lc(vcpu, 0x0600, (u16 *) __LC_EXT_CPU_ADDR); 381 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 382 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 383 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 384 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 385 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 386 (u64 *) __LC_EXT_PARAMS2); 387 break; 388 case KVM_S390_INT_PFAULT_DONE: 389 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0, 390 inti->ext.ext_params2); 391 rc = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE); 392 rc |= put_guest_lc(vcpu, 0x0680, (u16 *)__LC_EXT_CPU_ADDR); 393 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 394 &vcpu->arch.sie_block->gpsw, 395 sizeof(psw_t)); 396 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 397 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 398 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 399 (u64 *)__LC_EXT_PARAMS2); 400 break; 401 case KVM_S390_INT_VIRTIO: 402 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx", 403 inti->ext.ext_params, inti->ext.ext_params2); 404 vcpu->stat.deliver_virtio_interrupt++; 405 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 406 inti->ext.ext_params, 407 inti->ext.ext_params2); 408 rc = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE); 409 rc |= put_guest_lc(vcpu, 0x0d00, (u16 *)__LC_EXT_CPU_ADDR); 410 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 411 &vcpu->arch.sie_block->gpsw, 412 sizeof(psw_t)); 413 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 414 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 415 rc |= put_guest_lc(vcpu, inti->ext.ext_params, 416 (u32 *)__LC_EXT_PARAMS); 417 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 418 (u64 *)__LC_EXT_PARAMS2); 419 break; 420 case KVM_S390_SIGP_STOP: 421 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop"); 422 vcpu->stat.deliver_stop_signal++; 423 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 424 0, 0); 425 __set_intercept_indicator(vcpu, inti); 426 break; 427 428 case KVM_S390_SIGP_SET_PREFIX: 429 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", 430 inti->prefix.address); 431 vcpu->stat.deliver_prefix_signal++; 432 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 433 inti->prefix.address, 0); 434 kvm_s390_set_prefix(vcpu, inti->prefix.address); 435 break; 436 437 case KVM_S390_RESTART: 438 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart"); 439 vcpu->stat.deliver_restart_signal++; 440 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 441 0, 0); 442 rc = write_guest_lc(vcpu, 443 offsetof(struct _lowcore, restart_old_psw), 444 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 445 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw), 446 &vcpu->arch.sie_block->gpsw, 447 sizeof(psw_t)); 448 break; 449 case KVM_S390_PROGRAM_INT: 450 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x", 451 inti->pgm.code, 452 table[vcpu->arch.sie_block->ipa >> 14]); 453 vcpu->stat.deliver_program_int++; 454 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 455 inti->pgm.code, 0); 456 rc = __deliver_prog_irq(vcpu, &inti->pgm); 457 break; 458 459 case KVM_S390_MCHK: 460 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx", 461 inti->mchk.mcic); 462 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 463 inti->mchk.cr14, 464 inti->mchk.mcic); 465 rc = kvm_s390_vcpu_store_status(vcpu, 466 KVM_S390_STORE_STATUS_PREFIXED); 467 rc |= put_guest_lc(vcpu, inti->mchk.mcic, (u64 *)__LC_MCCK_CODE); 468 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW, 469 &vcpu->arch.sie_block->gpsw, 470 sizeof(psw_t)); 471 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW, 472 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 473 break; 474 475 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 476 { 477 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) | 478 inti->io.subchannel_nr; 479 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) | 480 inti->io.io_int_word; 481 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type); 482 vcpu->stat.deliver_io_int++; 483 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 484 param0, param1); 485 rc = put_guest_lc(vcpu, inti->io.subchannel_id, 486 (u16 *)__LC_SUBCHANNEL_ID); 487 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr, 488 (u16 *)__LC_SUBCHANNEL_NR); 489 rc |= put_guest_lc(vcpu, inti->io.io_int_parm, 490 (u32 *)__LC_IO_INT_PARM); 491 rc |= put_guest_lc(vcpu, inti->io.io_int_word, 492 (u32 *)__LC_IO_INT_WORD); 493 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW, 494 &vcpu->arch.sie_block->gpsw, 495 sizeof(psw_t)); 496 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW, 497 &vcpu->arch.sie_block->gpsw, 498 sizeof(psw_t)); 499 break; 500 } 501 default: 502 BUG(); 503 } 504 if (rc) { 505 printk("kvm: The guest lowcore is not mapped during interrupt " 506 "delivery, killing userspace\n"); 507 do_exit(SIGKILL); 508 } 509 } 510 511 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu) 512 { 513 int rc; 514 515 rc = put_guest_lc(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE); 516 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 517 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 518 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 519 &vcpu->arch.sie_block->gpsw, 520 sizeof(psw_t)); 521 if (rc) { 522 printk("kvm: The guest lowcore is not mapped during interrupt " 523 "delivery, killing userspace\n"); 524 do_exit(SIGKILL); 525 } 526 } 527 528 /* Check whether SIGP interpretation facility has an external call pending */ 529 int kvm_s390_si_ext_call_pending(struct kvm_vcpu *vcpu) 530 { 531 atomic_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl; 532 533 if (!psw_extint_disabled(vcpu) && 534 (vcpu->arch.sie_block->gcr[0] & 0x2000ul) && 535 (atomic_read(sigp_ctrl) & SIGP_CTRL_C) && 536 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND)) 537 return 1; 538 539 return 0; 540 } 541 542 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu) 543 { 544 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 545 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int; 546 struct kvm_s390_interrupt_info *inti; 547 int rc = 0; 548 549 if (atomic_read(&li->active)) { 550 spin_lock(&li->lock); 551 list_for_each_entry(inti, &li->list, list) 552 if (__interrupt_is_deliverable(vcpu, inti)) { 553 rc = 1; 554 break; 555 } 556 spin_unlock(&li->lock); 557 } 558 559 if ((!rc) && atomic_read(&fi->active)) { 560 spin_lock(&fi->lock); 561 list_for_each_entry(inti, &fi->list, list) 562 if (__interrupt_is_deliverable(vcpu, inti)) { 563 rc = 1; 564 break; 565 } 566 spin_unlock(&fi->lock); 567 } 568 569 if (!rc && kvm_cpu_has_pending_timer(vcpu)) 570 rc = 1; 571 572 if (!rc && kvm_s390_si_ext_call_pending(vcpu)) 573 rc = 1; 574 575 return rc; 576 } 577 578 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 579 { 580 if (!(vcpu->arch.sie_block->ckc < 581 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) 582 return 0; 583 if (!ckc_interrupts_enabled(vcpu)) 584 return 0; 585 return 1; 586 } 587 588 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) 589 { 590 u64 now, sltime; 591 592 vcpu->stat.exit_wait_state++; 593 594 /* fast path */ 595 if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu)) 596 return 0; 597 598 if (psw_interrupts_disabled(vcpu)) { 599 VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); 600 return -EOPNOTSUPP; /* disabled wait */ 601 } 602 603 __set_cpu_idle(vcpu); 604 if (!ckc_interrupts_enabled(vcpu)) { 605 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); 606 goto no_timer; 607 } 608 609 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch; 610 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); 611 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); 612 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime); 613 no_timer: 614 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 615 kvm_vcpu_block(vcpu); 616 __unset_cpu_idle(vcpu); 617 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 618 619 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer); 620 return 0; 621 } 622 623 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) 624 { 625 if (waitqueue_active(&vcpu->wq)) { 626 /* 627 * The vcpu gave up the cpu voluntarily, mark it as a good 628 * yield-candidate. 629 */ 630 vcpu->preempted = true; 631 wake_up_interruptible(&vcpu->wq); 632 } 633 } 634 635 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer) 636 { 637 struct kvm_vcpu *vcpu; 638 639 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer); 640 kvm_s390_vcpu_wakeup(vcpu); 641 642 return HRTIMER_NORESTART; 643 } 644 645 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu) 646 { 647 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 648 struct kvm_s390_interrupt_info *n, *inti = NULL; 649 650 spin_lock(&li->lock); 651 list_for_each_entry_safe(inti, n, &li->list, list) { 652 list_del(&inti->list); 653 kfree(inti); 654 } 655 atomic_set(&li->active, 0); 656 spin_unlock(&li->lock); 657 658 /* clear pending external calls set by sigp interpretation facility */ 659 atomic_clear_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags); 660 atomic_clear_mask(SIGP_CTRL_C, 661 &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl); 662 } 663 664 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) 665 { 666 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 667 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int; 668 struct kvm_s390_interrupt_info *n, *inti = NULL; 669 int deliver; 670 671 __reset_intercept_indicators(vcpu); 672 if (atomic_read(&li->active)) { 673 do { 674 deliver = 0; 675 spin_lock(&li->lock); 676 list_for_each_entry_safe(inti, n, &li->list, list) { 677 if (__interrupt_is_deliverable(vcpu, inti)) { 678 list_del(&inti->list); 679 deliver = 1; 680 break; 681 } 682 __set_intercept_indicator(vcpu, inti); 683 } 684 if (list_empty(&li->list)) 685 atomic_set(&li->active, 0); 686 spin_unlock(&li->lock); 687 if (deliver) { 688 __do_deliver_interrupt(vcpu, inti); 689 kfree(inti); 690 } 691 } while (deliver); 692 } 693 694 if (kvm_cpu_has_pending_timer(vcpu)) 695 deliver_ckc_interrupt(vcpu); 696 697 if (atomic_read(&fi->active)) { 698 do { 699 deliver = 0; 700 spin_lock(&fi->lock); 701 list_for_each_entry_safe(inti, n, &fi->list, list) { 702 if (__interrupt_is_deliverable(vcpu, inti)) { 703 list_del(&inti->list); 704 fi->irq_count--; 705 deliver = 1; 706 break; 707 } 708 __set_intercept_indicator(vcpu, inti); 709 } 710 if (list_empty(&fi->list)) 711 atomic_set(&fi->active, 0); 712 spin_unlock(&fi->lock); 713 if (deliver) { 714 __do_deliver_interrupt(vcpu, inti); 715 kfree(inti); 716 } 717 } while (deliver); 718 } 719 } 720 721 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu) 722 { 723 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 724 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int; 725 struct kvm_s390_interrupt_info *n, *inti = NULL; 726 int deliver; 727 728 __reset_intercept_indicators(vcpu); 729 if (atomic_read(&li->active)) { 730 do { 731 deliver = 0; 732 spin_lock(&li->lock); 733 list_for_each_entry_safe(inti, n, &li->list, list) { 734 if ((inti->type == KVM_S390_MCHK) && 735 __interrupt_is_deliverable(vcpu, inti)) { 736 list_del(&inti->list); 737 deliver = 1; 738 break; 739 } 740 __set_intercept_indicator(vcpu, inti); 741 } 742 if (list_empty(&li->list)) 743 atomic_set(&li->active, 0); 744 spin_unlock(&li->lock); 745 if (deliver) { 746 __do_deliver_interrupt(vcpu, inti); 747 kfree(inti); 748 } 749 } while (deliver); 750 } 751 752 if (atomic_read(&fi->active)) { 753 do { 754 deliver = 0; 755 spin_lock(&fi->lock); 756 list_for_each_entry_safe(inti, n, &fi->list, list) { 757 if ((inti->type == KVM_S390_MCHK) && 758 __interrupt_is_deliverable(vcpu, inti)) { 759 list_del(&inti->list); 760 fi->irq_count--; 761 deliver = 1; 762 break; 763 } 764 __set_intercept_indicator(vcpu, inti); 765 } 766 if (list_empty(&fi->list)) 767 atomic_set(&fi->active, 0); 768 spin_unlock(&fi->lock); 769 if (deliver) { 770 __do_deliver_interrupt(vcpu, inti); 771 kfree(inti); 772 } 773 } while (deliver); 774 } 775 } 776 777 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code) 778 { 779 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 780 struct kvm_s390_interrupt_info *inti; 781 782 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 783 if (!inti) 784 return -ENOMEM; 785 786 inti->type = KVM_S390_PROGRAM_INT; 787 inti->pgm.code = code; 788 789 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code); 790 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1); 791 spin_lock(&li->lock); 792 list_add(&inti->list, &li->list); 793 atomic_set(&li->active, 1); 794 BUG_ON(waitqueue_active(li->wq)); 795 spin_unlock(&li->lock); 796 return 0; 797 } 798 799 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu, 800 struct kvm_s390_pgm_info *pgm_info) 801 { 802 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 803 struct kvm_s390_interrupt_info *inti; 804 805 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 806 if (!inti) 807 return -ENOMEM; 808 809 VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)", 810 pgm_info->code); 811 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 812 pgm_info->code, 0, 1); 813 814 inti->type = KVM_S390_PROGRAM_INT; 815 memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm)); 816 spin_lock(&li->lock); 817 list_add(&inti->list, &li->list); 818 atomic_set(&li->active, 1); 819 BUG_ON(waitqueue_active(li->wq)); 820 spin_unlock(&li->lock); 821 return 0; 822 } 823 824 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm, 825 u64 cr6, u64 schid) 826 { 827 struct kvm_s390_float_interrupt *fi; 828 struct kvm_s390_interrupt_info *inti, *iter; 829 830 if ((!schid && !cr6) || (schid && cr6)) 831 return NULL; 832 mutex_lock(&kvm->lock); 833 fi = &kvm->arch.float_int; 834 spin_lock(&fi->lock); 835 inti = NULL; 836 list_for_each_entry(iter, &fi->list, list) { 837 if (!is_ioint(iter->type)) 838 continue; 839 if (cr6 && 840 ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0)) 841 continue; 842 if (schid) { 843 if (((schid & 0x00000000ffff0000) >> 16) != 844 iter->io.subchannel_id) 845 continue; 846 if ((schid & 0x000000000000ffff) != 847 iter->io.subchannel_nr) 848 continue; 849 } 850 inti = iter; 851 break; 852 } 853 if (inti) { 854 list_del_init(&inti->list); 855 fi->irq_count--; 856 } 857 if (list_empty(&fi->list)) 858 atomic_set(&fi->active, 0); 859 spin_unlock(&fi->lock); 860 mutex_unlock(&kvm->lock); 861 return inti; 862 } 863 864 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 865 { 866 struct kvm_s390_local_interrupt *li; 867 struct kvm_s390_float_interrupt *fi; 868 struct kvm_s390_interrupt_info *iter; 869 struct kvm_vcpu *dst_vcpu = NULL; 870 int sigcpu; 871 int rc = 0; 872 873 mutex_lock(&kvm->lock); 874 fi = &kvm->arch.float_int; 875 spin_lock(&fi->lock); 876 if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) { 877 rc = -EINVAL; 878 goto unlock_fi; 879 } 880 fi->irq_count++; 881 if (!is_ioint(inti->type)) { 882 list_add_tail(&inti->list, &fi->list); 883 } else { 884 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word); 885 886 /* Keep I/O interrupts sorted in isc order. */ 887 list_for_each_entry(iter, &fi->list, list) { 888 if (!is_ioint(iter->type)) 889 continue; 890 if (int_word_to_isc_bits(iter->io.io_int_word) 891 <= isc_bits) 892 continue; 893 break; 894 } 895 list_add_tail(&inti->list, &iter->list); 896 } 897 atomic_set(&fi->active, 1); 898 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS); 899 if (sigcpu == KVM_MAX_VCPUS) { 900 do { 901 sigcpu = fi->next_rr_cpu++; 902 if (sigcpu == KVM_MAX_VCPUS) 903 sigcpu = fi->next_rr_cpu = 0; 904 } while (kvm_get_vcpu(kvm, sigcpu) == NULL); 905 } 906 dst_vcpu = kvm_get_vcpu(kvm, sigcpu); 907 li = &dst_vcpu->arch.local_int; 908 spin_lock(&li->lock); 909 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 910 spin_unlock(&li->lock); 911 kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu)); 912 unlock_fi: 913 spin_unlock(&fi->lock); 914 mutex_unlock(&kvm->lock); 915 return rc; 916 } 917 918 int kvm_s390_inject_vm(struct kvm *kvm, 919 struct kvm_s390_interrupt *s390int) 920 { 921 struct kvm_s390_interrupt_info *inti; 922 923 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 924 if (!inti) 925 return -ENOMEM; 926 927 inti->type = s390int->type; 928 switch (inti->type) { 929 case KVM_S390_INT_VIRTIO: 930 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx", 931 s390int->parm, s390int->parm64); 932 inti->ext.ext_params = s390int->parm; 933 inti->ext.ext_params2 = s390int->parm64; 934 break; 935 case KVM_S390_INT_SERVICE: 936 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm); 937 inti->ext.ext_params = s390int->parm; 938 break; 939 case KVM_S390_INT_PFAULT_DONE: 940 inti->type = s390int->type; 941 inti->ext.ext_params2 = s390int->parm64; 942 break; 943 case KVM_S390_MCHK: 944 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx", 945 s390int->parm64); 946 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */ 947 inti->mchk.mcic = s390int->parm64; 948 break; 949 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 950 if (inti->type & IOINT_AI_MASK) 951 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)"); 952 else 953 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x", 954 s390int->type & IOINT_CSSID_MASK, 955 s390int->type & IOINT_SSID_MASK, 956 s390int->type & IOINT_SCHID_MASK); 957 inti->io.subchannel_id = s390int->parm >> 16; 958 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu; 959 inti->io.io_int_parm = s390int->parm64 >> 32; 960 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull; 961 break; 962 default: 963 kfree(inti); 964 return -EINVAL; 965 } 966 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64, 967 2); 968 969 return __inject_vm(kvm, inti); 970 } 971 972 void kvm_s390_reinject_io_int(struct kvm *kvm, 973 struct kvm_s390_interrupt_info *inti) 974 { 975 __inject_vm(kvm, inti); 976 } 977 978 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, 979 struct kvm_s390_interrupt *s390int) 980 { 981 struct kvm_s390_local_interrupt *li; 982 struct kvm_s390_interrupt_info *inti; 983 984 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 985 if (!inti) 986 return -ENOMEM; 987 988 switch (s390int->type) { 989 case KVM_S390_PROGRAM_INT: 990 if (s390int->parm & 0xffff0000) { 991 kfree(inti); 992 return -EINVAL; 993 } 994 inti->type = s390int->type; 995 inti->pgm.code = s390int->parm; 996 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)", 997 s390int->parm); 998 break; 999 case KVM_S390_SIGP_SET_PREFIX: 1000 inti->prefix.address = s390int->parm; 1001 inti->type = s390int->type; 1002 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)", 1003 s390int->parm); 1004 break; 1005 case KVM_S390_SIGP_STOP: 1006 case KVM_S390_RESTART: 1007 case KVM_S390_INT_CLOCK_COMP: 1008 case KVM_S390_INT_CPU_TIMER: 1009 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type); 1010 inti->type = s390int->type; 1011 break; 1012 case KVM_S390_INT_EXTERNAL_CALL: 1013 if (s390int->parm & 0xffff0000) { 1014 kfree(inti); 1015 return -EINVAL; 1016 } 1017 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u", 1018 s390int->parm); 1019 inti->type = s390int->type; 1020 inti->extcall.code = s390int->parm; 1021 break; 1022 case KVM_S390_INT_EMERGENCY: 1023 if (s390int->parm & 0xffff0000) { 1024 kfree(inti); 1025 return -EINVAL; 1026 } 1027 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm); 1028 inti->type = s390int->type; 1029 inti->emerg.code = s390int->parm; 1030 break; 1031 case KVM_S390_MCHK: 1032 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx", 1033 s390int->parm64); 1034 inti->type = s390int->type; 1035 inti->mchk.mcic = s390int->parm64; 1036 break; 1037 case KVM_S390_INT_PFAULT_INIT: 1038 inti->type = s390int->type; 1039 inti->ext.ext_params2 = s390int->parm64; 1040 break; 1041 case KVM_S390_INT_VIRTIO: 1042 case KVM_S390_INT_SERVICE: 1043 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1044 default: 1045 kfree(inti); 1046 return -EINVAL; 1047 } 1048 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm, 1049 s390int->parm64, 2); 1050 1051 mutex_lock(&vcpu->kvm->lock); 1052 li = &vcpu->arch.local_int; 1053 spin_lock(&li->lock); 1054 if (inti->type == KVM_S390_PROGRAM_INT) 1055 list_add(&inti->list, &li->list); 1056 else 1057 list_add_tail(&inti->list, &li->list); 1058 atomic_set(&li->active, 1); 1059 if (inti->type == KVM_S390_SIGP_STOP) 1060 li->action_bits |= ACTION_STOP_ON_STOP; 1061 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1062 spin_unlock(&li->lock); 1063 mutex_unlock(&vcpu->kvm->lock); 1064 kvm_s390_vcpu_wakeup(vcpu); 1065 return 0; 1066 } 1067 1068 void kvm_s390_clear_float_irqs(struct kvm *kvm) 1069 { 1070 struct kvm_s390_float_interrupt *fi; 1071 struct kvm_s390_interrupt_info *n, *inti = NULL; 1072 1073 mutex_lock(&kvm->lock); 1074 fi = &kvm->arch.float_int; 1075 spin_lock(&fi->lock); 1076 list_for_each_entry_safe(inti, n, &fi->list, list) { 1077 list_del(&inti->list); 1078 kfree(inti); 1079 } 1080 fi->irq_count = 0; 1081 atomic_set(&fi->active, 0); 1082 spin_unlock(&fi->lock); 1083 mutex_unlock(&kvm->lock); 1084 } 1085 1086 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti, 1087 u8 *addr) 1088 { 1089 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr; 1090 struct kvm_s390_irq irq = {0}; 1091 1092 irq.type = inti->type; 1093 switch (inti->type) { 1094 case KVM_S390_INT_PFAULT_INIT: 1095 case KVM_S390_INT_PFAULT_DONE: 1096 case KVM_S390_INT_VIRTIO: 1097 case KVM_S390_INT_SERVICE: 1098 irq.u.ext = inti->ext; 1099 break; 1100 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1101 irq.u.io = inti->io; 1102 break; 1103 case KVM_S390_MCHK: 1104 irq.u.mchk = inti->mchk; 1105 break; 1106 default: 1107 return -EINVAL; 1108 } 1109 1110 if (copy_to_user(uptr, &irq, sizeof(irq))) 1111 return -EFAULT; 1112 1113 return 0; 1114 } 1115 1116 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len) 1117 { 1118 struct kvm_s390_interrupt_info *inti; 1119 struct kvm_s390_float_interrupt *fi; 1120 int ret = 0; 1121 int n = 0; 1122 1123 mutex_lock(&kvm->lock); 1124 fi = &kvm->arch.float_int; 1125 spin_lock(&fi->lock); 1126 1127 list_for_each_entry(inti, &fi->list, list) { 1128 if (len < sizeof(struct kvm_s390_irq)) { 1129 /* signal userspace to try again */ 1130 ret = -ENOMEM; 1131 break; 1132 } 1133 ret = copy_irq_to_user(inti, buf); 1134 if (ret) 1135 break; 1136 buf += sizeof(struct kvm_s390_irq); 1137 len -= sizeof(struct kvm_s390_irq); 1138 n++; 1139 } 1140 1141 spin_unlock(&fi->lock); 1142 mutex_unlock(&kvm->lock); 1143 1144 return ret < 0 ? ret : n; 1145 } 1146 1147 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1148 { 1149 int r; 1150 1151 switch (attr->group) { 1152 case KVM_DEV_FLIC_GET_ALL_IRQS: 1153 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr, 1154 attr->attr); 1155 break; 1156 default: 1157 r = -EINVAL; 1158 } 1159 1160 return r; 1161 } 1162 1163 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti, 1164 u64 addr) 1165 { 1166 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr; 1167 void *target = NULL; 1168 void __user *source; 1169 u64 size; 1170 1171 if (get_user(inti->type, (u64 __user *)addr)) 1172 return -EFAULT; 1173 1174 switch (inti->type) { 1175 case KVM_S390_INT_PFAULT_INIT: 1176 case KVM_S390_INT_PFAULT_DONE: 1177 case KVM_S390_INT_VIRTIO: 1178 case KVM_S390_INT_SERVICE: 1179 target = (void *) &inti->ext; 1180 source = &uptr->u.ext; 1181 size = sizeof(inti->ext); 1182 break; 1183 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1184 target = (void *) &inti->io; 1185 source = &uptr->u.io; 1186 size = sizeof(inti->io); 1187 break; 1188 case KVM_S390_MCHK: 1189 target = (void *) &inti->mchk; 1190 source = &uptr->u.mchk; 1191 size = sizeof(inti->mchk); 1192 break; 1193 default: 1194 return -EINVAL; 1195 } 1196 1197 if (copy_from_user(target, source, size)) 1198 return -EFAULT; 1199 1200 return 0; 1201 } 1202 1203 static int enqueue_floating_irq(struct kvm_device *dev, 1204 struct kvm_device_attr *attr) 1205 { 1206 struct kvm_s390_interrupt_info *inti = NULL; 1207 int r = 0; 1208 int len = attr->attr; 1209 1210 if (len % sizeof(struct kvm_s390_irq) != 0) 1211 return -EINVAL; 1212 else if (len > KVM_S390_FLIC_MAX_BUFFER) 1213 return -EINVAL; 1214 1215 while (len >= sizeof(struct kvm_s390_irq)) { 1216 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1217 if (!inti) 1218 return -ENOMEM; 1219 1220 r = copy_irq_from_user(inti, attr->addr); 1221 if (r) { 1222 kfree(inti); 1223 return r; 1224 } 1225 r = __inject_vm(dev->kvm, inti); 1226 if (r) { 1227 kfree(inti); 1228 return r; 1229 } 1230 len -= sizeof(struct kvm_s390_irq); 1231 attr->addr += sizeof(struct kvm_s390_irq); 1232 } 1233 1234 return r; 1235 } 1236 1237 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id) 1238 { 1239 if (id >= MAX_S390_IO_ADAPTERS) 1240 return NULL; 1241 return kvm->arch.adapters[id]; 1242 } 1243 1244 static int register_io_adapter(struct kvm_device *dev, 1245 struct kvm_device_attr *attr) 1246 { 1247 struct s390_io_adapter *adapter; 1248 struct kvm_s390_io_adapter adapter_info; 1249 1250 if (copy_from_user(&adapter_info, 1251 (void __user *)attr->addr, sizeof(adapter_info))) 1252 return -EFAULT; 1253 1254 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) || 1255 (dev->kvm->arch.adapters[adapter_info.id] != NULL)) 1256 return -EINVAL; 1257 1258 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); 1259 if (!adapter) 1260 return -ENOMEM; 1261 1262 INIT_LIST_HEAD(&adapter->maps); 1263 init_rwsem(&adapter->maps_lock); 1264 atomic_set(&adapter->nr_maps, 0); 1265 adapter->id = adapter_info.id; 1266 adapter->isc = adapter_info.isc; 1267 adapter->maskable = adapter_info.maskable; 1268 adapter->masked = false; 1269 adapter->swap = adapter_info.swap; 1270 dev->kvm->arch.adapters[adapter->id] = adapter; 1271 1272 return 0; 1273 } 1274 1275 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked) 1276 { 1277 int ret; 1278 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1279 1280 if (!adapter || !adapter->maskable) 1281 return -EINVAL; 1282 ret = adapter->masked; 1283 adapter->masked = masked; 1284 return ret; 1285 } 1286 1287 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr) 1288 { 1289 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1290 struct s390_map_info *map; 1291 int ret; 1292 1293 if (!adapter || !addr) 1294 return -EINVAL; 1295 1296 map = kzalloc(sizeof(*map), GFP_KERNEL); 1297 if (!map) { 1298 ret = -ENOMEM; 1299 goto out; 1300 } 1301 INIT_LIST_HEAD(&map->list); 1302 map->guest_addr = addr; 1303 map->addr = gmap_translate(addr, kvm->arch.gmap); 1304 if (map->addr == -EFAULT) { 1305 ret = -EFAULT; 1306 goto out; 1307 } 1308 ret = get_user_pages_fast(map->addr, 1, 1, &map->page); 1309 if (ret < 0) 1310 goto out; 1311 BUG_ON(ret != 1); 1312 down_write(&adapter->maps_lock); 1313 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) { 1314 list_add_tail(&map->list, &adapter->maps); 1315 ret = 0; 1316 } else { 1317 put_page(map->page); 1318 ret = -EINVAL; 1319 } 1320 up_write(&adapter->maps_lock); 1321 out: 1322 if (ret) 1323 kfree(map); 1324 return ret; 1325 } 1326 1327 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr) 1328 { 1329 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1330 struct s390_map_info *map, *tmp; 1331 int found = 0; 1332 1333 if (!adapter || !addr) 1334 return -EINVAL; 1335 1336 down_write(&adapter->maps_lock); 1337 list_for_each_entry_safe(map, tmp, &adapter->maps, list) { 1338 if (map->guest_addr == addr) { 1339 found = 1; 1340 atomic_dec(&adapter->nr_maps); 1341 list_del(&map->list); 1342 put_page(map->page); 1343 kfree(map); 1344 break; 1345 } 1346 } 1347 up_write(&adapter->maps_lock); 1348 1349 return found ? 0 : -EINVAL; 1350 } 1351 1352 void kvm_s390_destroy_adapters(struct kvm *kvm) 1353 { 1354 int i; 1355 struct s390_map_info *map, *tmp; 1356 1357 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) { 1358 if (!kvm->arch.adapters[i]) 1359 continue; 1360 list_for_each_entry_safe(map, tmp, 1361 &kvm->arch.adapters[i]->maps, list) { 1362 list_del(&map->list); 1363 put_page(map->page); 1364 kfree(map); 1365 } 1366 kfree(kvm->arch.adapters[i]); 1367 } 1368 } 1369 1370 static int modify_io_adapter(struct kvm_device *dev, 1371 struct kvm_device_attr *attr) 1372 { 1373 struct kvm_s390_io_adapter_req req; 1374 struct s390_io_adapter *adapter; 1375 int ret; 1376 1377 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) 1378 return -EFAULT; 1379 1380 adapter = get_io_adapter(dev->kvm, req.id); 1381 if (!adapter) 1382 return -EINVAL; 1383 switch (req.type) { 1384 case KVM_S390_IO_ADAPTER_MASK: 1385 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask); 1386 if (ret > 0) 1387 ret = 0; 1388 break; 1389 case KVM_S390_IO_ADAPTER_MAP: 1390 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr); 1391 break; 1392 case KVM_S390_IO_ADAPTER_UNMAP: 1393 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr); 1394 break; 1395 default: 1396 ret = -EINVAL; 1397 } 1398 1399 return ret; 1400 } 1401 1402 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1403 { 1404 int r = 0; 1405 unsigned int i; 1406 struct kvm_vcpu *vcpu; 1407 1408 switch (attr->group) { 1409 case KVM_DEV_FLIC_ENQUEUE: 1410 r = enqueue_floating_irq(dev, attr); 1411 break; 1412 case KVM_DEV_FLIC_CLEAR_IRQS: 1413 r = 0; 1414 kvm_s390_clear_float_irqs(dev->kvm); 1415 break; 1416 case KVM_DEV_FLIC_APF_ENABLE: 1417 dev->kvm->arch.gmap->pfault_enabled = 1; 1418 break; 1419 case KVM_DEV_FLIC_APF_DISABLE_WAIT: 1420 dev->kvm->arch.gmap->pfault_enabled = 0; 1421 /* 1422 * Make sure no async faults are in transition when 1423 * clearing the queues. So we don't need to worry 1424 * about late coming workers. 1425 */ 1426 synchronize_srcu(&dev->kvm->srcu); 1427 kvm_for_each_vcpu(i, vcpu, dev->kvm) 1428 kvm_clear_async_pf_completion_queue(vcpu); 1429 break; 1430 case KVM_DEV_FLIC_ADAPTER_REGISTER: 1431 r = register_io_adapter(dev, attr); 1432 break; 1433 case KVM_DEV_FLIC_ADAPTER_MODIFY: 1434 r = modify_io_adapter(dev, attr); 1435 break; 1436 default: 1437 r = -EINVAL; 1438 } 1439 1440 return r; 1441 } 1442 1443 static int flic_create(struct kvm_device *dev, u32 type) 1444 { 1445 if (!dev) 1446 return -EINVAL; 1447 if (dev->kvm->arch.flic) 1448 return -EINVAL; 1449 dev->kvm->arch.flic = dev; 1450 return 0; 1451 } 1452 1453 static void flic_destroy(struct kvm_device *dev) 1454 { 1455 dev->kvm->arch.flic = NULL; 1456 kfree(dev); 1457 } 1458 1459 /* s390 floating irq controller (flic) */ 1460 struct kvm_device_ops kvm_flic_ops = { 1461 .name = "kvm-flic", 1462 .get_attr = flic_get_attr, 1463 .set_attr = flic_set_attr, 1464 .create = flic_create, 1465 .destroy = flic_destroy, 1466 }; 1467 1468 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap) 1469 { 1470 unsigned long bit; 1471 1472 bit = bit_nr + (addr % PAGE_SIZE) * 8; 1473 1474 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit; 1475 } 1476 1477 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter, 1478 u64 addr) 1479 { 1480 struct s390_map_info *map; 1481 1482 if (!adapter) 1483 return NULL; 1484 1485 list_for_each_entry(map, &adapter->maps, list) { 1486 if (map->guest_addr == addr) 1487 return map; 1488 } 1489 return NULL; 1490 } 1491 1492 static int adapter_indicators_set(struct kvm *kvm, 1493 struct s390_io_adapter *adapter, 1494 struct kvm_s390_adapter_int *adapter_int) 1495 { 1496 unsigned long bit; 1497 int summary_set, idx; 1498 struct s390_map_info *info; 1499 void *map; 1500 1501 info = get_map_info(adapter, adapter_int->ind_addr); 1502 if (!info) 1503 return -1; 1504 map = page_address(info->page); 1505 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap); 1506 set_bit(bit, map); 1507 idx = srcu_read_lock(&kvm->srcu); 1508 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 1509 set_page_dirty_lock(info->page); 1510 info = get_map_info(adapter, adapter_int->summary_addr); 1511 if (!info) { 1512 srcu_read_unlock(&kvm->srcu, idx); 1513 return -1; 1514 } 1515 map = page_address(info->page); 1516 bit = get_ind_bit(info->addr, adapter_int->summary_offset, 1517 adapter->swap); 1518 summary_set = test_and_set_bit(bit, map); 1519 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 1520 set_page_dirty_lock(info->page); 1521 srcu_read_unlock(&kvm->srcu, idx); 1522 return summary_set ? 0 : 1; 1523 } 1524 1525 /* 1526 * < 0 - not injected due to error 1527 * = 0 - coalesced, summary indicator already active 1528 * > 0 - injected interrupt 1529 */ 1530 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e, 1531 struct kvm *kvm, int irq_source_id, int level, 1532 bool line_status) 1533 { 1534 int ret; 1535 struct s390_io_adapter *adapter; 1536 1537 /* We're only interested in the 0->1 transition. */ 1538 if (!level) 1539 return 0; 1540 adapter = get_io_adapter(kvm, e->adapter.adapter_id); 1541 if (!adapter) 1542 return -1; 1543 down_read(&adapter->maps_lock); 1544 ret = adapter_indicators_set(kvm, adapter, &e->adapter); 1545 up_read(&adapter->maps_lock); 1546 if ((ret > 0) && !adapter->masked) { 1547 struct kvm_s390_interrupt s390int = { 1548 .type = KVM_S390_INT_IO(1, 0, 0, 0), 1549 .parm = 0, 1550 .parm64 = (adapter->isc << 27) | 0x80000000, 1551 }; 1552 ret = kvm_s390_inject_vm(kvm, &s390int); 1553 if (ret == 0) 1554 ret = 1; 1555 } 1556 return ret; 1557 } 1558 1559 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, 1560 const struct kvm_irq_routing_entry *ue) 1561 { 1562 int ret; 1563 1564 switch (ue->type) { 1565 case KVM_IRQ_ROUTING_S390_ADAPTER: 1566 e->set = set_adapter_int; 1567 e->adapter.summary_addr = ue->u.adapter.summary_addr; 1568 e->adapter.ind_addr = ue->u.adapter.ind_addr; 1569 e->adapter.summary_offset = ue->u.adapter.summary_offset; 1570 e->adapter.ind_offset = ue->u.adapter.ind_offset; 1571 e->adapter.adapter_id = ue->u.adapter.adapter_id; 1572 ret = 0; 1573 break; 1574 default: 1575 ret = -EINVAL; 1576 } 1577 1578 return ret; 1579 } 1580 1581 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, 1582 int irq_source_id, int level, bool line_status) 1583 { 1584 return -EINVAL; 1585 } 1586