1 /* 2 * sigp.c - handlinge 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 "gaccess.h" 19 #include "kvm-s390.h" 20 21 /* sigp order codes */ 22 #define SIGP_SENSE 0x01 23 #define SIGP_EXTERNAL_CALL 0x02 24 #define SIGP_EMERGENCY 0x03 25 #define SIGP_START 0x04 26 #define SIGP_STOP 0x05 27 #define SIGP_RESTART 0x06 28 #define SIGP_STOP_STORE_STATUS 0x09 29 #define SIGP_INITIAL_CPU_RESET 0x0b 30 #define SIGP_CPU_RESET 0x0c 31 #define SIGP_SET_PREFIX 0x0d 32 #define SIGP_STORE_STATUS_ADDR 0x0e 33 #define SIGP_SET_ARCH 0x12 34 35 /* cpu status bits */ 36 #define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL 37 #define SIGP_STAT_INCORRECT_STATE 0x00000200UL 38 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL 39 #define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL 40 #define SIGP_STAT_STOPPED 0x00000040UL 41 #define SIGP_STAT_OPERATOR_INTERV 0x00000020UL 42 #define SIGP_STAT_CHECK_STOP 0x00000010UL 43 #define SIGP_STAT_INOPERATIVE 0x00000004UL 44 #define SIGP_STAT_INVALID_ORDER 0x00000002UL 45 #define SIGP_STAT_RECEIVER_CHECK 0x00000001UL 46 47 48 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, 49 unsigned long *reg) 50 { 51 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 52 int rc; 53 54 if (cpu_addr >= KVM_MAX_VCPUS) 55 return 3; /* not operational */ 56 57 spin_lock(&fi->lock); 58 if (fi->local_int[cpu_addr] == NULL) 59 rc = 3; /* not operational */ 60 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags) 61 & CPUSTAT_RUNNING) { 62 *reg &= 0xffffffff00000000UL; 63 rc = 1; /* status stored */ 64 } else { 65 *reg &= 0xffffffff00000000UL; 66 *reg |= SIGP_STAT_STOPPED; 67 rc = 1; /* status stored */ 68 } 69 spin_unlock(&fi->lock); 70 71 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc); 72 return rc; 73 } 74 75 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) 76 { 77 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 78 struct kvm_s390_local_interrupt *li; 79 struct kvm_s390_interrupt_info *inti; 80 int rc; 81 82 if (cpu_addr >= KVM_MAX_VCPUS) 83 return 3; /* not operational */ 84 85 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 86 if (!inti) 87 return -ENOMEM; 88 89 inti->type = KVM_S390_INT_EMERGENCY; 90 inti->emerg.code = vcpu->vcpu_id; 91 92 spin_lock(&fi->lock); 93 li = fi->local_int[cpu_addr]; 94 if (li == NULL) { 95 rc = 3; /* not operational */ 96 kfree(inti); 97 goto unlock; 98 } 99 spin_lock_bh(&li->lock); 100 list_add_tail(&inti->list, &li->list); 101 atomic_set(&li->active, 1); 102 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 103 if (waitqueue_active(&li->wq)) 104 wake_up_interruptible(&li->wq); 105 spin_unlock_bh(&li->lock); 106 rc = 0; /* order accepted */ 107 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); 108 unlock: 109 spin_unlock(&fi->lock); 110 return rc; 111 } 112 113 static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr) 114 { 115 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 116 struct kvm_s390_local_interrupt *li; 117 struct kvm_s390_interrupt_info *inti; 118 int rc; 119 120 if (cpu_addr >= KVM_MAX_VCPUS) 121 return 3; /* not operational */ 122 123 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 124 if (!inti) 125 return -ENOMEM; 126 127 inti->type = KVM_S390_INT_EXTERNAL_CALL; 128 inti->extcall.code = vcpu->vcpu_id; 129 130 spin_lock(&fi->lock); 131 li = fi->local_int[cpu_addr]; 132 if (li == NULL) { 133 rc = 3; /* not operational */ 134 kfree(inti); 135 goto unlock; 136 } 137 spin_lock_bh(&li->lock); 138 list_add_tail(&inti->list, &li->list); 139 atomic_set(&li->active, 1); 140 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 141 if (waitqueue_active(&li->wq)) 142 wake_up_interruptible(&li->wq); 143 spin_unlock_bh(&li->lock); 144 rc = 0; /* order accepted */ 145 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr); 146 unlock: 147 spin_unlock(&fi->lock); 148 return rc; 149 } 150 151 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) 152 { 153 struct kvm_s390_interrupt_info *inti; 154 155 inti = kzalloc(sizeof(*inti), GFP_ATOMIC); 156 if (!inti) 157 return -ENOMEM; 158 inti->type = KVM_S390_SIGP_STOP; 159 160 spin_lock_bh(&li->lock); 161 list_add_tail(&inti->list, &li->list); 162 atomic_set(&li->active, 1); 163 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); 164 li->action_bits |= action; 165 if (waitqueue_active(&li->wq)) 166 wake_up_interruptible(&li->wq); 167 spin_unlock_bh(&li->lock); 168 169 return 0; /* order accepted */ 170 } 171 172 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) 173 { 174 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 175 struct kvm_s390_local_interrupt *li; 176 int rc; 177 178 if (cpu_addr >= KVM_MAX_VCPUS) 179 return 3; /* not operational */ 180 181 spin_lock(&fi->lock); 182 li = fi->local_int[cpu_addr]; 183 if (li == NULL) { 184 rc = 3; /* not operational */ 185 goto unlock; 186 } 187 188 rc = __inject_sigp_stop(li, action); 189 190 unlock: 191 spin_unlock(&fi->lock); 192 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); 193 return rc; 194 } 195 196 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action) 197 { 198 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 199 return __inject_sigp_stop(li, action); 200 } 201 202 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) 203 { 204 int rc; 205 206 switch (parameter & 0xff) { 207 case 0: 208 rc = 3; /* not operational */ 209 break; 210 case 1: 211 case 2: 212 rc = 0; /* order accepted */ 213 break; 214 default: 215 rc = -EOPNOTSUPP; 216 } 217 return rc; 218 } 219 220 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, 221 unsigned long *reg) 222 { 223 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 224 struct kvm_s390_local_interrupt *li = NULL; 225 struct kvm_s390_interrupt_info *inti; 226 int rc; 227 u8 tmp; 228 229 /* make sure that the new value is valid memory */ 230 address = address & 0x7fffe000u; 231 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || 232 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) { 233 *reg |= SIGP_STAT_INVALID_PARAMETER; 234 return 1; /* invalid parameter */ 235 } 236 237 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 238 if (!inti) 239 return 2; /* busy */ 240 241 spin_lock(&fi->lock); 242 if (cpu_addr < KVM_MAX_VCPUS) 243 li = fi->local_int[cpu_addr]; 244 245 if (li == NULL) { 246 rc = 1; /* incorrect state */ 247 *reg &= SIGP_STAT_INCORRECT_STATE; 248 kfree(inti); 249 goto out_fi; 250 } 251 252 spin_lock_bh(&li->lock); 253 /* cpu must be in stopped state */ 254 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) { 255 rc = 1; /* incorrect state */ 256 *reg &= SIGP_STAT_INCORRECT_STATE; 257 kfree(inti); 258 goto out_li; 259 } 260 261 inti->type = KVM_S390_SIGP_SET_PREFIX; 262 inti->prefix.address = address; 263 264 list_add_tail(&inti->list, &li->list); 265 atomic_set(&li->active, 1); 266 if (waitqueue_active(&li->wq)) 267 wake_up_interruptible(&li->wq); 268 rc = 0; /* order accepted */ 269 270 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address); 271 out_li: 272 spin_unlock_bh(&li->lock); 273 out_fi: 274 spin_unlock(&fi->lock); 275 return rc; 276 } 277 278 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) 279 { 280 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 281 int r3 = vcpu->arch.sie_block->ipa & 0x000f; 282 int base2 = vcpu->arch.sie_block->ipb >> 28; 283 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); 284 u32 parameter; 285 u16 cpu_addr = vcpu->arch.guest_gprs[r3]; 286 u8 order_code; 287 int rc; 288 289 /* sigp in userspace can exit */ 290 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 291 return kvm_s390_inject_program_int(vcpu, 292 PGM_PRIVILEGED_OPERATION); 293 294 order_code = disp2; 295 if (base2) 296 order_code += vcpu->arch.guest_gprs[base2]; 297 298 if (r1 % 2) 299 parameter = vcpu->arch.guest_gprs[r1]; 300 else 301 parameter = vcpu->arch.guest_gprs[r1 + 1]; 302 303 switch (order_code) { 304 case SIGP_SENSE: 305 vcpu->stat.instruction_sigp_sense++; 306 rc = __sigp_sense(vcpu, cpu_addr, 307 &vcpu->arch.guest_gprs[r1]); 308 break; 309 case SIGP_EXTERNAL_CALL: 310 vcpu->stat.instruction_sigp_external_call++; 311 rc = __sigp_external_call(vcpu, cpu_addr); 312 break; 313 case SIGP_EMERGENCY: 314 vcpu->stat.instruction_sigp_emergency++; 315 rc = __sigp_emergency(vcpu, cpu_addr); 316 break; 317 case SIGP_STOP: 318 vcpu->stat.instruction_sigp_stop++; 319 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); 320 break; 321 case SIGP_STOP_STORE_STATUS: 322 vcpu->stat.instruction_sigp_stop++; 323 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP); 324 break; 325 case SIGP_SET_ARCH: 326 vcpu->stat.instruction_sigp_arch++; 327 rc = __sigp_set_arch(vcpu, parameter); 328 break; 329 case SIGP_SET_PREFIX: 330 vcpu->stat.instruction_sigp_prefix++; 331 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, 332 &vcpu->arch.guest_gprs[r1]); 333 break; 334 case SIGP_RESTART: 335 vcpu->stat.instruction_sigp_restart++; 336 /* user space must know about restart */ 337 default: 338 return -EOPNOTSUPP; 339 } 340 341 if (rc < 0) 342 return rc; 343 344 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 345 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44; 346 return 0; 347 } 348