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 "gaccess.h" 18 #include "kvm-s390.h" 19 20 /* sigp order codes */ 21 #define SIGP_SENSE 0x01 22 #define SIGP_EXTERNAL_CALL 0x02 23 #define SIGP_EMERGENCY 0x03 24 #define SIGP_START 0x04 25 #define SIGP_STOP 0x05 26 #define SIGP_RESTART 0x06 27 #define SIGP_STOP_STORE_STATUS 0x09 28 #define SIGP_INITIAL_CPU_RESET 0x0b 29 #define SIGP_CPU_RESET 0x0c 30 #define SIGP_SET_PREFIX 0x0d 31 #define SIGP_STORE_STATUS_ADDR 0x0e 32 #define SIGP_SET_ARCH 0x12 33 34 /* cpu status bits */ 35 #define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL 36 #define SIGP_STAT_INCORRECT_STATE 0x00000200UL 37 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL 38 #define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL 39 #define SIGP_STAT_STOPPED 0x00000040UL 40 #define SIGP_STAT_OPERATOR_INTERV 0x00000020UL 41 #define SIGP_STAT_CHECK_STOP 0x00000010UL 42 #define SIGP_STAT_INOPERATIVE 0x00000004UL 43 #define SIGP_STAT_INVALID_ORDER 0x00000002UL 44 #define SIGP_STAT_RECEIVER_CHECK 0x00000001UL 45 46 47 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, 48 unsigned long *reg) 49 { 50 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 51 int rc; 52 53 if (cpu_addr >= KVM_MAX_VCPUS) 54 return 3; /* not operational */ 55 56 spin_lock(&fi->lock); 57 if (fi->local_int[cpu_addr] == NULL) 58 rc = 3; /* not operational */ 59 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags) 60 & CPUSTAT_RUNNING) { 61 *reg &= 0xffffffff00000000UL; 62 rc = 1; /* status stored */ 63 } else { 64 *reg &= 0xffffffff00000000UL; 65 *reg |= SIGP_STAT_STOPPED; 66 rc = 1; /* status stored */ 67 } 68 spin_unlock(&fi->lock); 69 70 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc); 71 return rc; 72 } 73 74 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) 75 { 76 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 77 struct kvm_s390_local_interrupt *li; 78 struct kvm_s390_interrupt_info *inti; 79 int rc; 80 81 if (cpu_addr >= KVM_MAX_VCPUS) 82 return 3; /* not operational */ 83 84 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 85 if (!inti) 86 return -ENOMEM; 87 88 inti->type = KVM_S390_INT_EMERGENCY; 89 90 spin_lock(&fi->lock); 91 li = fi->local_int[cpu_addr]; 92 if (li == NULL) { 93 rc = 3; /* not operational */ 94 kfree(inti); 95 goto unlock; 96 } 97 spin_lock_bh(&li->lock); 98 list_add_tail(&inti->list, &li->list); 99 atomic_set(&li->active, 1); 100 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 101 if (waitqueue_active(&li->wq)) 102 wake_up_interruptible(&li->wq); 103 spin_unlock_bh(&li->lock); 104 rc = 0; /* order accepted */ 105 unlock: 106 spin_unlock(&fi->lock); 107 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); 108 return rc; 109 } 110 111 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) 112 { 113 struct kvm_s390_interrupt_info *inti; 114 115 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 116 if (!inti) 117 return -ENOMEM; 118 inti->type = KVM_S390_SIGP_STOP; 119 120 spin_lock_bh(&li->lock); 121 list_add_tail(&inti->list, &li->list); 122 atomic_set(&li->active, 1); 123 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); 124 li->action_bits |= action; 125 if (waitqueue_active(&li->wq)) 126 wake_up_interruptible(&li->wq); 127 spin_unlock_bh(&li->lock); 128 129 return 0; /* order accepted */ 130 } 131 132 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) 133 { 134 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 135 struct kvm_s390_local_interrupt *li; 136 int rc; 137 138 if (cpu_addr >= KVM_MAX_VCPUS) 139 return 3; /* not operational */ 140 141 spin_lock(&fi->lock); 142 li = fi->local_int[cpu_addr]; 143 if (li == NULL) { 144 rc = 3; /* not operational */ 145 goto unlock; 146 } 147 148 rc = __inject_sigp_stop(li, action); 149 150 unlock: 151 spin_unlock(&fi->lock); 152 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); 153 return rc; 154 } 155 156 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action) 157 { 158 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 159 return __inject_sigp_stop(li, action); 160 } 161 162 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) 163 { 164 int rc; 165 166 switch (parameter & 0xff) { 167 case 0: 168 rc = 3; /* not operational */ 169 break; 170 case 1: 171 case 2: 172 rc = 0; /* order accepted */ 173 break; 174 default: 175 rc = -ENOTSUPP; 176 } 177 return rc; 178 } 179 180 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, 181 unsigned long *reg) 182 { 183 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 184 struct kvm_s390_local_interrupt *li = NULL; 185 struct kvm_s390_interrupt_info *inti; 186 int rc; 187 u8 tmp; 188 189 /* make sure that the new value is valid memory */ 190 address = address & 0x7fffe000u; 191 if ((copy_from_user(&tmp, (void __user *) 192 (address + vcpu->arch.sie_block->gmsor) , 1)) || 193 (copy_from_user(&tmp, (void __user *)(address + 194 vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) { 195 *reg |= SIGP_STAT_INVALID_PARAMETER; 196 return 1; /* invalid parameter */ 197 } 198 199 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 200 if (!inti) 201 return 2; /* busy */ 202 203 spin_lock(&fi->lock); 204 if (cpu_addr < KVM_MAX_VCPUS) 205 li = fi->local_int[cpu_addr]; 206 207 if (li == NULL) { 208 rc = 1; /* incorrect state */ 209 *reg &= SIGP_STAT_INCORRECT_STATE; 210 kfree(inti); 211 goto out_fi; 212 } 213 214 spin_lock_bh(&li->lock); 215 /* cpu must be in stopped state */ 216 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) { 217 rc = 1; /* incorrect state */ 218 *reg &= SIGP_STAT_INCORRECT_STATE; 219 kfree(inti); 220 goto out_li; 221 } 222 223 inti->type = KVM_S390_SIGP_SET_PREFIX; 224 inti->prefix.address = address; 225 226 list_add_tail(&inti->list, &li->list); 227 atomic_set(&li->active, 1); 228 if (waitqueue_active(&li->wq)) 229 wake_up_interruptible(&li->wq); 230 rc = 0; /* order accepted */ 231 232 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address); 233 out_li: 234 spin_unlock_bh(&li->lock); 235 out_fi: 236 spin_unlock(&fi->lock); 237 return rc; 238 } 239 240 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) 241 { 242 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 243 int r3 = vcpu->arch.sie_block->ipa & 0x000f; 244 int base2 = vcpu->arch.sie_block->ipb >> 28; 245 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); 246 u32 parameter; 247 u16 cpu_addr = vcpu->arch.guest_gprs[r3]; 248 u8 order_code; 249 int rc; 250 251 /* sigp in userspace can exit */ 252 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 253 return kvm_s390_inject_program_int(vcpu, 254 PGM_PRIVILEGED_OPERATION); 255 256 order_code = disp2; 257 if (base2) 258 order_code += vcpu->arch.guest_gprs[base2]; 259 260 if (r1 % 2) 261 parameter = vcpu->arch.guest_gprs[r1]; 262 else 263 parameter = vcpu->arch.guest_gprs[r1 + 1]; 264 265 switch (order_code) { 266 case SIGP_SENSE: 267 vcpu->stat.instruction_sigp_sense++; 268 rc = __sigp_sense(vcpu, cpu_addr, 269 &vcpu->arch.guest_gprs[r1]); 270 break; 271 case SIGP_EMERGENCY: 272 vcpu->stat.instruction_sigp_emergency++; 273 rc = __sigp_emergency(vcpu, cpu_addr); 274 break; 275 case SIGP_STOP: 276 vcpu->stat.instruction_sigp_stop++; 277 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); 278 break; 279 case SIGP_STOP_STORE_STATUS: 280 vcpu->stat.instruction_sigp_stop++; 281 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP); 282 break; 283 case SIGP_SET_ARCH: 284 vcpu->stat.instruction_sigp_arch++; 285 rc = __sigp_set_arch(vcpu, parameter); 286 break; 287 case SIGP_SET_PREFIX: 288 vcpu->stat.instruction_sigp_prefix++; 289 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, 290 &vcpu->arch.guest_gprs[r1]); 291 break; 292 case SIGP_RESTART: 293 vcpu->stat.instruction_sigp_restart++; 294 /* user space must know about restart */ 295 default: 296 return -ENOTSUPP; 297 } 298 299 if (rc < 0) 300 return rc; 301 302 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 303 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44; 304 return 0; 305 } 306