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 91 spin_lock(&fi->lock); 92 li = fi->local_int[cpu_addr]; 93 if (li == NULL) { 94 rc = 3; /* not operational */ 95 kfree(inti); 96 goto unlock; 97 } 98 spin_lock_bh(&li->lock); 99 list_add_tail(&inti->list, &li->list); 100 atomic_set(&li->active, 1); 101 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 102 if (waitqueue_active(&li->wq)) 103 wake_up_interruptible(&li->wq); 104 spin_unlock_bh(&li->lock); 105 rc = 0; /* order accepted */ 106 unlock: 107 spin_unlock(&fi->lock); 108 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); 109 return rc; 110 } 111 112 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) 113 { 114 struct kvm_s390_interrupt_info *inti; 115 116 inti = kzalloc(sizeof(*inti), GFP_ATOMIC); 117 if (!inti) 118 return -ENOMEM; 119 inti->type = KVM_S390_SIGP_STOP; 120 121 spin_lock_bh(&li->lock); 122 list_add_tail(&inti->list, &li->list); 123 atomic_set(&li->active, 1); 124 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); 125 li->action_bits |= action; 126 if (waitqueue_active(&li->wq)) 127 wake_up_interruptible(&li->wq); 128 spin_unlock_bh(&li->lock); 129 130 return 0; /* order accepted */ 131 } 132 133 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) 134 { 135 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 136 struct kvm_s390_local_interrupt *li; 137 int rc; 138 139 if (cpu_addr >= KVM_MAX_VCPUS) 140 return 3; /* not operational */ 141 142 spin_lock(&fi->lock); 143 li = fi->local_int[cpu_addr]; 144 if (li == NULL) { 145 rc = 3; /* not operational */ 146 goto unlock; 147 } 148 149 rc = __inject_sigp_stop(li, action); 150 151 unlock: 152 spin_unlock(&fi->lock); 153 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); 154 return rc; 155 } 156 157 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action) 158 { 159 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 160 return __inject_sigp_stop(li, action); 161 } 162 163 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) 164 { 165 int rc; 166 167 switch (parameter & 0xff) { 168 case 0: 169 rc = 3; /* not operational */ 170 break; 171 case 1: 172 case 2: 173 rc = 0; /* order accepted */ 174 break; 175 default: 176 rc = -EOPNOTSUPP; 177 } 178 return rc; 179 } 180 181 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, 182 unsigned long *reg) 183 { 184 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 185 struct kvm_s390_local_interrupt *li = NULL; 186 struct kvm_s390_interrupt_info *inti; 187 int rc; 188 u8 tmp; 189 190 /* make sure that the new value is valid memory */ 191 address = address & 0x7fffe000u; 192 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || 193 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) { 194 *reg |= SIGP_STAT_INVALID_PARAMETER; 195 return 1; /* invalid parameter */ 196 } 197 198 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 199 if (!inti) 200 return 2; /* busy */ 201 202 spin_lock(&fi->lock); 203 if (cpu_addr < KVM_MAX_VCPUS) 204 li = fi->local_int[cpu_addr]; 205 206 if (li == NULL) { 207 rc = 1; /* incorrect state */ 208 *reg &= SIGP_STAT_INCORRECT_STATE; 209 kfree(inti); 210 goto out_fi; 211 } 212 213 spin_lock_bh(&li->lock); 214 /* cpu must be in stopped state */ 215 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) { 216 rc = 1; /* incorrect state */ 217 *reg &= SIGP_STAT_INCORRECT_STATE; 218 kfree(inti); 219 goto out_li; 220 } 221 222 inti->type = KVM_S390_SIGP_SET_PREFIX; 223 inti->prefix.address = address; 224 225 list_add_tail(&inti->list, &li->list); 226 atomic_set(&li->active, 1); 227 if (waitqueue_active(&li->wq)) 228 wake_up_interruptible(&li->wq); 229 rc = 0; /* order accepted */ 230 231 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address); 232 out_li: 233 spin_unlock_bh(&li->lock); 234 out_fi: 235 spin_unlock(&fi->lock); 236 return rc; 237 } 238 239 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) 240 { 241 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 242 int r3 = vcpu->arch.sie_block->ipa & 0x000f; 243 int base2 = vcpu->arch.sie_block->ipb >> 28; 244 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); 245 u32 parameter; 246 u16 cpu_addr = vcpu->arch.guest_gprs[r3]; 247 u8 order_code; 248 int rc; 249 250 /* sigp in userspace can exit */ 251 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 252 return kvm_s390_inject_program_int(vcpu, 253 PGM_PRIVILEGED_OPERATION); 254 255 order_code = disp2; 256 if (base2) 257 order_code += vcpu->arch.guest_gprs[base2]; 258 259 if (r1 % 2) 260 parameter = vcpu->arch.guest_gprs[r1]; 261 else 262 parameter = vcpu->arch.guest_gprs[r1 + 1]; 263 264 switch (order_code) { 265 case SIGP_SENSE: 266 vcpu->stat.instruction_sigp_sense++; 267 rc = __sigp_sense(vcpu, cpu_addr, 268 &vcpu->arch.guest_gprs[r1]); 269 break; 270 case SIGP_EMERGENCY: 271 vcpu->stat.instruction_sigp_emergency++; 272 rc = __sigp_emergency(vcpu, cpu_addr); 273 break; 274 case SIGP_STOP: 275 vcpu->stat.instruction_sigp_stop++; 276 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); 277 break; 278 case SIGP_STOP_STORE_STATUS: 279 vcpu->stat.instruction_sigp_stop++; 280 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP); 281 break; 282 case SIGP_SET_ARCH: 283 vcpu->stat.instruction_sigp_arch++; 284 rc = __sigp_set_arch(vcpu, parameter); 285 break; 286 case SIGP_SET_PREFIX: 287 vcpu->stat.instruction_sigp_prefix++; 288 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, 289 &vcpu->arch.guest_gprs[r1]); 290 break; 291 case SIGP_RESTART: 292 vcpu->stat.instruction_sigp_restart++; 293 /* user space must know about restart */ 294 default: 295 return -EOPNOTSUPP; 296 } 297 298 if (rc < 0) 299 return rc; 300 301 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 302 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44; 303 return 0; 304 } 305