Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 1 | /* |
| 2 | * priv.c - handling privileged instructions |
| 3 | * |
| 4 | * Copyright IBM Corp. 2008 |
| 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 | */ |
| 13 | |
| 14 | #include <linux/kvm.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <asm/current.h> |
| 17 | #include <asm/debug.h> |
| 18 | #include <asm/ebcdic.h> |
| 19 | #include <asm/sysinfo.h> |
| 20 | #include "gaccess.h" |
| 21 | #include "kvm-s390.h" |
| 22 | |
| 23 | static int handle_set_prefix(struct kvm_vcpu *vcpu) |
| 24 | { |
| 25 | int base2 = vcpu->arch.sie_block->ipb >> 28; |
| 26 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); |
| 27 | u64 operand2; |
| 28 | u32 address = 0; |
| 29 | u8 tmp; |
| 30 | |
| 31 | vcpu->stat.instruction_spx++; |
| 32 | |
| 33 | operand2 = disp2; |
| 34 | if (base2) |
| 35 | operand2 += vcpu->arch.guest_gprs[base2]; |
| 36 | |
| 37 | /* must be word boundary */ |
| 38 | if (operand2 & 3) { |
| 39 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| 40 | goto out; |
| 41 | } |
| 42 | |
| 43 | /* get the value */ |
| 44 | if (get_guest_u32(vcpu, operand2, &address)) { |
| 45 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 46 | goto out; |
| 47 | } |
| 48 | |
| 49 | address = address & 0x7fffe000u; |
| 50 | |
| 51 | /* make sure that the new value is valid memory */ |
| 52 | if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || |
| 53 | (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) { |
| 54 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 55 | goto out; |
| 56 | } |
| 57 | |
| 58 | vcpu->arch.sie_block->prefix = address; |
| 59 | vcpu->arch.sie_block->ihcpu = 0xffff; |
| 60 | |
| 61 | VCPU_EVENT(vcpu, 5, "setting prefix to %x", address); |
| 62 | out: |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int handle_store_prefix(struct kvm_vcpu *vcpu) |
| 67 | { |
| 68 | int base2 = vcpu->arch.sie_block->ipb >> 28; |
| 69 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); |
| 70 | u64 operand2; |
| 71 | u32 address; |
| 72 | |
| 73 | vcpu->stat.instruction_stpx++; |
| 74 | operand2 = disp2; |
| 75 | if (base2) |
| 76 | operand2 += vcpu->arch.guest_gprs[base2]; |
| 77 | |
| 78 | /* must be word boundary */ |
| 79 | if (operand2 & 3) { |
| 80 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| 81 | goto out; |
| 82 | } |
| 83 | |
| 84 | address = vcpu->arch.sie_block->prefix; |
| 85 | address = address & 0x7fffe000u; |
| 86 | |
| 87 | /* get the value */ |
| 88 | if (put_guest_u32(vcpu, operand2, address)) { |
| 89 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 90 | goto out; |
| 91 | } |
| 92 | |
| 93 | VCPU_EVENT(vcpu, 5, "storing prefix to %x", address); |
| 94 | out: |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static int handle_store_cpu_address(struct kvm_vcpu *vcpu) |
| 99 | { |
| 100 | int base2 = vcpu->arch.sie_block->ipb >> 28; |
| 101 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); |
| 102 | u64 useraddr; |
| 103 | int rc; |
| 104 | |
| 105 | vcpu->stat.instruction_stap++; |
| 106 | useraddr = disp2; |
| 107 | if (base2) |
| 108 | useraddr += vcpu->arch.guest_gprs[base2]; |
| 109 | |
| 110 | if (useraddr & 1) { |
| 111 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| 112 | goto out; |
| 113 | } |
| 114 | |
| 115 | rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id); |
| 116 | if (rc == -EFAULT) { |
| 117 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 118 | goto out; |
| 119 | } |
| 120 | |
Heiko Carstens | 33e1911 | 2009-01-09 12:14:56 +0100 | [diff] [blame] | 121 | VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr); |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 122 | out: |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static int handle_skey(struct kvm_vcpu *vcpu) |
| 127 | { |
| 128 | vcpu->stat.instruction_storage_key++; |
| 129 | vcpu->arch.sie_block->gpsw.addr -= 4; |
| 130 | VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | static int handle_stsch(struct kvm_vcpu *vcpu) |
| 135 | { |
| 136 | vcpu->stat.instruction_stsch++; |
| 137 | VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3"); |
| 138 | /* condition code 3 */ |
| 139 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); |
| 140 | vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int handle_chsc(struct kvm_vcpu *vcpu) |
| 145 | { |
| 146 | vcpu->stat.instruction_chsc++; |
| 147 | VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3"); |
| 148 | /* condition code 3 */ |
| 149 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); |
| 150 | vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; |
| 151 | return 0; |
| 152 | } |
| 153 | |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 154 | static int handle_stfl(struct kvm_vcpu *vcpu) |
| 155 | { |
Heiko Carstens | 484875b | 2008-04-30 13:38:43 +0200 | [diff] [blame] | 156 | unsigned int facility_list = stfl(); |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 157 | int rc; |
| 158 | |
| 159 | vcpu->stat.instruction_stfl++; |
Christian Borntraeger | a0046b6 | 2008-08-29 13:29:45 +0200 | [diff] [blame] | 160 | /* only pass the facility bits, which we can handle */ |
Christian Borntraeger | ef50f7a | 2009-06-23 17:24:07 +0200 | [diff] [blame] | 161 | facility_list &= 0xff00fff3; |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 162 | |
| 163 | rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list), |
| 164 | &facility_list, sizeof(facility_list)); |
| 165 | if (rc == -EFAULT) |
| 166 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 167 | else |
| 168 | VCPU_EVENT(vcpu, 5, "store facility list value %x", |
| 169 | facility_list); |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static int handle_stidp(struct kvm_vcpu *vcpu) |
| 174 | { |
| 175 | int base2 = vcpu->arch.sie_block->ipb >> 28; |
| 176 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); |
| 177 | u64 operand2; |
| 178 | int rc; |
| 179 | |
| 180 | vcpu->stat.instruction_stidp++; |
| 181 | operand2 = disp2; |
| 182 | if (base2) |
| 183 | operand2 += vcpu->arch.guest_gprs[base2]; |
| 184 | |
| 185 | if (operand2 & 7) { |
| 186 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| 187 | goto out; |
| 188 | } |
| 189 | |
| 190 | rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data); |
| 191 | if (rc == -EFAULT) { |
| 192 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 193 | goto out; |
| 194 | } |
| 195 | |
| 196 | VCPU_EVENT(vcpu, 5, "%s", "store cpu id"); |
| 197 | out: |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) |
| 202 | { |
Christian Borntraeger | 180c12f | 2008-06-27 15:05:40 +0200 | [diff] [blame] | 203 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 204 | int cpus = 0; |
| 205 | int n; |
| 206 | |
Christian Borntraeger | b037a4f | 2009-05-12 17:21:50 +0200 | [diff] [blame] | 207 | spin_lock(&fi->lock); |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 208 | for (n = 0; n < KVM_MAX_VCPUS; n++) |
| 209 | if (fi->local_int[n]) |
| 210 | cpus++; |
Christian Borntraeger | b037a4f | 2009-05-12 17:21:50 +0200 | [diff] [blame] | 211 | spin_unlock(&fi->lock); |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 212 | |
| 213 | /* deal with other level 3 hypervisors */ |
| 214 | if (stsi(mem, 3, 2, 2) == -ENOSYS) |
| 215 | mem->count = 0; |
| 216 | if (mem->count < 8) |
| 217 | mem->count++; |
| 218 | for (n = mem->count - 1; n > 0 ; n--) |
| 219 | memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); |
| 220 | |
| 221 | mem->vm[0].cpus_total = cpus; |
| 222 | mem->vm[0].cpus_configured = cpus; |
| 223 | mem->vm[0].cpus_standby = 0; |
| 224 | mem->vm[0].cpus_reserved = 0; |
| 225 | mem->vm[0].caf = 1000; |
| 226 | memcpy(mem->vm[0].name, "KVMguest", 8); |
| 227 | ASCEBC(mem->vm[0].name, 8); |
| 228 | memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); |
| 229 | ASCEBC(mem->vm[0].cpi, 16); |
| 230 | } |
| 231 | |
| 232 | static int handle_stsi(struct kvm_vcpu *vcpu) |
| 233 | { |
| 234 | int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28; |
| 235 | int sel1 = vcpu->arch.guest_gprs[0] & 0xff; |
| 236 | int sel2 = vcpu->arch.guest_gprs[1] & 0xffff; |
| 237 | int base2 = vcpu->arch.sie_block->ipb >> 28; |
| 238 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); |
| 239 | u64 operand2; |
| 240 | unsigned long mem; |
| 241 | |
| 242 | vcpu->stat.instruction_stsi++; |
| 243 | VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2); |
| 244 | |
| 245 | operand2 = disp2; |
| 246 | if (base2) |
| 247 | operand2 += vcpu->arch.guest_gprs[base2]; |
| 248 | |
| 249 | if (operand2 & 0xfff && fc > 0) |
| 250 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| 251 | |
| 252 | switch (fc) { |
| 253 | case 0: |
| 254 | vcpu->arch.guest_gprs[0] = 3 << 28; |
| 255 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); |
| 256 | return 0; |
| 257 | case 1: /* same handling for 1 and 2 */ |
| 258 | case 2: |
| 259 | mem = get_zeroed_page(GFP_KERNEL); |
| 260 | if (!mem) |
| 261 | goto out_fail; |
| 262 | if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS) |
| 263 | goto out_mem; |
| 264 | break; |
| 265 | case 3: |
| 266 | if (sel1 != 2 || sel2 != 2) |
| 267 | goto out_fail; |
| 268 | mem = get_zeroed_page(GFP_KERNEL); |
| 269 | if (!mem) |
| 270 | goto out_fail; |
| 271 | handle_stsi_3_2_2(vcpu, (void *) mem); |
| 272 | break; |
| 273 | default: |
| 274 | goto out_fail; |
| 275 | } |
| 276 | |
| 277 | if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) { |
| 278 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 279 | goto out_mem; |
| 280 | } |
| 281 | free_page(mem); |
| 282 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); |
| 283 | vcpu->arch.guest_gprs[0] = 0; |
| 284 | return 0; |
| 285 | out_mem: |
| 286 | free_page(mem); |
| 287 | out_fail: |
| 288 | /* condition code 3 */ |
| 289 | vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static intercept_handler_t priv_handlers[256] = { |
| 294 | [0x02] = handle_stidp, |
| 295 | [0x10] = handle_set_prefix, |
| 296 | [0x11] = handle_store_prefix, |
| 297 | [0x12] = handle_store_cpu_address, |
| 298 | [0x29] = handle_skey, |
| 299 | [0x2a] = handle_skey, |
| 300 | [0x2b] = handle_skey, |
| 301 | [0x34] = handle_stsch, |
| 302 | [0x5f] = handle_chsc, |
| 303 | [0x7d] = handle_stsi, |
| 304 | [0xb1] = handle_stfl, |
| 305 | }; |
| 306 | |
Christian Borntraeger | 70455a3 | 2009-01-22 10:28:29 +0100 | [diff] [blame] | 307 | int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 308 | { |
| 309 | intercept_handler_t handler; |
| 310 | |
Christian Borntraeger | 70455a3 | 2009-01-22 10:28:29 +0100 | [diff] [blame] | 311 | /* |
| 312 | * a lot of B2 instructions are priviledged. We first check for |
| 313 | * the priviledges ones, that we can handle in the kernel. If the |
| 314 | * kernel can handle this instruction, we check for the problem |
| 315 | * state bit and (a) handle the instruction or (b) send a code 2 |
| 316 | * program check. |
| 317 | * Anything else goes to userspace.*/ |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 318 | handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; |
Christian Borntraeger | 70455a3 | 2009-01-22 10:28:29 +0100 | [diff] [blame] | 319 | if (handler) { |
| 320 | if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| 321 | return kvm_s390_inject_program_int(vcpu, |
| 322 | PGM_PRIVILEGED_OPERATION); |
| 323 | else |
| 324 | return handler(vcpu); |
| 325 | } |
Heiko Carstens | b8e660b | 2010-02-26 22:37:41 +0100 | [diff] [blame] | 326 | return -EOPNOTSUPP; |
Christian Borntraeger | 453423d | 2008-03-25 18:47:29 +0100 | [diff] [blame] | 327 | } |