1 /* 2 * handling interprocessor communication 3 * 4 * Copyright IBM Corp. 2008, 2009 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 * Christian Ehrhardt <ehrhardt@de.ibm.com> 13 */ 14 15 #include <linux/kvm.h> 16 #include <linux/kvm_host.h> 17 #include <linux/slab.h> 18 #include <asm/sigp.h> 19 #include "gaccess.h" 20 #include "kvm-s390.h" 21 #include "trace.h" 22 23 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, 24 u64 *reg) 25 { 26 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 27 int rc; 28 29 if (cpu_addr >= KVM_MAX_VCPUS) 30 return SIGP_CC_NOT_OPERATIONAL; 31 32 spin_lock(&fi->lock); 33 if (fi->local_int[cpu_addr] == NULL) 34 rc = SIGP_CC_NOT_OPERATIONAL; 35 else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags) 36 & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED))) 37 rc = SIGP_CC_ORDER_CODE_ACCEPTED; 38 else { 39 *reg &= 0xffffffff00000000UL; 40 if (atomic_read(fi->local_int[cpu_addr]->cpuflags) 41 & CPUSTAT_ECALL_PEND) 42 *reg |= SIGP_STATUS_EXT_CALL_PENDING; 43 if (atomic_read(fi->local_int[cpu_addr]->cpuflags) 44 & CPUSTAT_STOPPED) 45 *reg |= SIGP_STATUS_STOPPED; 46 rc = SIGP_CC_STATUS_STORED; 47 } 48 spin_unlock(&fi->lock); 49 50 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc); 51 return rc; 52 } 53 54 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) 55 { 56 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 57 struct kvm_s390_local_interrupt *li; 58 struct kvm_s390_interrupt_info *inti; 59 int rc; 60 61 if (cpu_addr >= KVM_MAX_VCPUS) 62 return SIGP_CC_NOT_OPERATIONAL; 63 64 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 65 if (!inti) 66 return -ENOMEM; 67 68 inti->type = KVM_S390_INT_EMERGENCY; 69 inti->emerg.code = vcpu->vcpu_id; 70 71 spin_lock(&fi->lock); 72 li = fi->local_int[cpu_addr]; 73 if (li == NULL) { 74 rc = SIGP_CC_NOT_OPERATIONAL; 75 kfree(inti); 76 goto unlock; 77 } 78 spin_lock_bh(&li->lock); 79 list_add_tail(&inti->list, &li->list); 80 atomic_set(&li->active, 1); 81 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 82 if (waitqueue_active(li->wq)) 83 wake_up_interruptible(li->wq); 84 spin_unlock_bh(&li->lock); 85 rc = SIGP_CC_ORDER_CODE_ACCEPTED; 86 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); 87 unlock: 88 spin_unlock(&fi->lock); 89 return rc; 90 } 91 92 static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr) 93 { 94 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 95 struct kvm_s390_local_interrupt *li; 96 struct kvm_s390_interrupt_info *inti; 97 int rc; 98 99 if (cpu_addr >= KVM_MAX_VCPUS) 100 return SIGP_CC_NOT_OPERATIONAL; 101 102 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 103 if (!inti) 104 return -ENOMEM; 105 106 inti->type = KVM_S390_INT_EXTERNAL_CALL; 107 inti->extcall.code = vcpu->vcpu_id; 108 109 spin_lock(&fi->lock); 110 li = fi->local_int[cpu_addr]; 111 if (li == NULL) { 112 rc = SIGP_CC_NOT_OPERATIONAL; 113 kfree(inti); 114 goto unlock; 115 } 116 spin_lock_bh(&li->lock); 117 list_add_tail(&inti->list, &li->list); 118 atomic_set(&li->active, 1); 119 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 120 if (waitqueue_active(li->wq)) 121 wake_up_interruptible(li->wq); 122 spin_unlock_bh(&li->lock); 123 rc = SIGP_CC_ORDER_CODE_ACCEPTED; 124 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr); 125 unlock: 126 spin_unlock(&fi->lock); 127 return rc; 128 } 129 130 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) 131 { 132 struct kvm_s390_interrupt_info *inti; 133 134 inti = kzalloc(sizeof(*inti), GFP_ATOMIC); 135 if (!inti) 136 return -ENOMEM; 137 inti->type = KVM_S390_SIGP_STOP; 138 139 spin_lock_bh(&li->lock); 140 if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) { 141 kfree(inti); 142 goto out; 143 } 144 list_add_tail(&inti->list, &li->list); 145 atomic_set(&li->active, 1); 146 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); 147 li->action_bits |= action; 148 if (waitqueue_active(li->wq)) 149 wake_up_interruptible(li->wq); 150 out: 151 spin_unlock_bh(&li->lock); 152 153 return SIGP_CC_ORDER_CODE_ACCEPTED; 154 } 155 156 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) 157 { 158 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 159 struct kvm_s390_local_interrupt *li; 160 int rc; 161 162 if (cpu_addr >= KVM_MAX_VCPUS) 163 return SIGP_CC_NOT_OPERATIONAL; 164 165 spin_lock(&fi->lock); 166 li = fi->local_int[cpu_addr]; 167 if (li == NULL) { 168 rc = SIGP_CC_NOT_OPERATIONAL; 169 goto unlock; 170 } 171 172 rc = __inject_sigp_stop(li, action); 173 174 unlock: 175 spin_unlock(&fi->lock); 176 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); 177 return rc; 178 } 179 180 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action) 181 { 182 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 183 return __inject_sigp_stop(li, action); 184 } 185 186 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) 187 { 188 int rc; 189 190 switch (parameter & 0xff) { 191 case 0: 192 rc = SIGP_CC_NOT_OPERATIONAL; 193 break; 194 case 1: 195 case 2: 196 rc = SIGP_CC_ORDER_CODE_ACCEPTED; 197 break; 198 default: 199 rc = -EOPNOTSUPP; 200 } 201 return rc; 202 } 203 204 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, 205 u64 *reg) 206 { 207 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 208 struct kvm_s390_local_interrupt *li = NULL; 209 struct kvm_s390_interrupt_info *inti; 210 int rc; 211 u8 tmp; 212 213 /* make sure that the new value is valid memory */ 214 address = address & 0x7fffe000u; 215 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || 216 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) { 217 *reg &= 0xffffffff00000000UL; 218 *reg |= SIGP_STATUS_INVALID_PARAMETER; 219 return SIGP_CC_STATUS_STORED; 220 } 221 222 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 223 if (!inti) 224 return SIGP_CC_BUSY; 225 226 spin_lock(&fi->lock); 227 if (cpu_addr < KVM_MAX_VCPUS) 228 li = fi->local_int[cpu_addr]; 229 230 if (li == NULL) { 231 *reg &= 0xffffffff00000000UL; 232 *reg |= SIGP_STATUS_INCORRECT_STATE; 233 rc = SIGP_CC_STATUS_STORED; 234 kfree(inti); 235 goto out_fi; 236 } 237 238 spin_lock_bh(&li->lock); 239 /* cpu must be in stopped state */ 240 if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) { 241 *reg &= 0xffffffff00000000UL; 242 *reg |= SIGP_STATUS_INCORRECT_STATE; 243 rc = SIGP_CC_STATUS_STORED; 244 kfree(inti); 245 goto out_li; 246 } 247 248 inti->type = KVM_S390_SIGP_SET_PREFIX; 249 inti->prefix.address = address; 250 251 list_add_tail(&inti->list, &li->list); 252 atomic_set(&li->active, 1); 253 if (waitqueue_active(li->wq)) 254 wake_up_interruptible(li->wq); 255 rc = SIGP_CC_ORDER_CODE_ACCEPTED; 256 257 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address); 258 out_li: 259 spin_unlock_bh(&li->lock); 260 out_fi: 261 spin_unlock(&fi->lock); 262 return rc; 263 } 264 265 static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr, 266 u64 *reg) 267 { 268 int rc; 269 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 270 271 if (cpu_addr >= KVM_MAX_VCPUS) 272 return SIGP_CC_NOT_OPERATIONAL; 273 274 spin_lock(&fi->lock); 275 if (fi->local_int[cpu_addr] == NULL) 276 rc = SIGP_CC_NOT_OPERATIONAL; 277 else { 278 if (atomic_read(fi->local_int[cpu_addr]->cpuflags) 279 & CPUSTAT_RUNNING) { 280 /* running */ 281 rc = SIGP_CC_ORDER_CODE_ACCEPTED; 282 } else { 283 /* not running */ 284 *reg &= 0xffffffff00000000UL; 285 *reg |= SIGP_STATUS_NOT_RUNNING; 286 rc = SIGP_CC_STATUS_STORED; 287 } 288 } 289 spin_unlock(&fi->lock); 290 291 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr, 292 rc); 293 294 return rc; 295 } 296 297 static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr) 298 { 299 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 300 struct kvm_s390_local_interrupt *li; 301 int rc = SIGP_CC_ORDER_CODE_ACCEPTED; 302 303 if (cpu_addr >= KVM_MAX_VCPUS) 304 return SIGP_CC_NOT_OPERATIONAL; 305 306 spin_lock(&fi->lock); 307 li = fi->local_int[cpu_addr]; 308 if (li == NULL) { 309 rc = SIGP_CC_NOT_OPERATIONAL; 310 goto out; 311 } 312 313 spin_lock_bh(&li->lock); 314 if (li->action_bits & ACTION_STOP_ON_STOP) 315 rc = SIGP_CC_BUSY; 316 else 317 VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace", 318 cpu_addr); 319 spin_unlock_bh(&li->lock); 320 out: 321 spin_unlock(&fi->lock); 322 return rc; 323 } 324 325 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) 326 { 327 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 328 int r3 = vcpu->arch.sie_block->ipa & 0x000f; 329 u32 parameter; 330 u16 cpu_addr = vcpu->run->s.regs.gprs[r3]; 331 u8 order_code; 332 int rc; 333 334 /* sigp in userspace can exit */ 335 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 336 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 337 338 order_code = kvm_s390_get_base_disp_rs(vcpu); 339 340 if (r1 % 2) 341 parameter = vcpu->run->s.regs.gprs[r1]; 342 else 343 parameter = vcpu->run->s.regs.gprs[r1 + 1]; 344 345 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter); 346 switch (order_code) { 347 case SIGP_SENSE: 348 vcpu->stat.instruction_sigp_sense++; 349 rc = __sigp_sense(vcpu, cpu_addr, 350 &vcpu->run->s.regs.gprs[r1]); 351 break; 352 case SIGP_EXTERNAL_CALL: 353 vcpu->stat.instruction_sigp_external_call++; 354 rc = __sigp_external_call(vcpu, cpu_addr); 355 break; 356 case SIGP_EMERGENCY_SIGNAL: 357 vcpu->stat.instruction_sigp_emergency++; 358 rc = __sigp_emergency(vcpu, cpu_addr); 359 break; 360 case SIGP_STOP: 361 vcpu->stat.instruction_sigp_stop++; 362 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); 363 break; 364 case SIGP_STOP_AND_STORE_STATUS: 365 vcpu->stat.instruction_sigp_stop++; 366 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP | 367 ACTION_STOP_ON_STOP); 368 break; 369 case SIGP_SET_ARCHITECTURE: 370 vcpu->stat.instruction_sigp_arch++; 371 rc = __sigp_set_arch(vcpu, parameter); 372 break; 373 case SIGP_SET_PREFIX: 374 vcpu->stat.instruction_sigp_prefix++; 375 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, 376 &vcpu->run->s.regs.gprs[r1]); 377 break; 378 case SIGP_SENSE_RUNNING: 379 vcpu->stat.instruction_sigp_sense_running++; 380 rc = __sigp_sense_running(vcpu, cpu_addr, 381 &vcpu->run->s.regs.gprs[r1]); 382 break; 383 case SIGP_RESTART: 384 vcpu->stat.instruction_sigp_restart++; 385 rc = __sigp_restart(vcpu, cpu_addr); 386 if (rc == SIGP_CC_BUSY) 387 break; 388 /* user space must know about restart */ 389 default: 390 return -EOPNOTSUPP; 391 } 392 393 if (rc < 0) 394 return rc; 395 396 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 397 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44; 398 return 0; 399 } 400