1 /* 2 * hosting zSeries kernel virtual machines 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 * Heiko Carstens <heiko.carstens@de.ibm.com> 13 * Christian Ehrhardt <ehrhardt@de.ibm.com> 14 * Jason J. Herne <jjherne@us.ibm.com> 15 */ 16 17 #include <linux/compiler.h> 18 #include <linux/err.h> 19 #include <linux/fs.h> 20 #include <linux/hrtimer.h> 21 #include <linux/init.h> 22 #include <linux/kvm.h> 23 #include <linux/kvm_host.h> 24 #include <linux/mman.h> 25 #include <linux/module.h> 26 #include <linux/random.h> 27 #include <linux/slab.h> 28 #include <linux/timer.h> 29 #include <linux/vmalloc.h> 30 #include <linux/bitmap.h> 31 #include <asm/asm-offsets.h> 32 #include <asm/lowcore.h> 33 #include <asm/stp.h> 34 #include <asm/pgtable.h> 35 #include <asm/gmap.h> 36 #include <asm/nmi.h> 37 #include <asm/switch_to.h> 38 #include <asm/isc.h> 39 #include <asm/sclp.h> 40 #include <asm/cpacf.h> 41 #include <asm/timex.h> 42 #include "kvm-s390.h" 43 #include "gaccess.h" 44 45 #define KMSG_COMPONENT "kvm-s390" 46 #undef pr_fmt 47 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 48 49 #define CREATE_TRACE_POINTS 50 #include "trace.h" 51 #include "trace-s390.h" 52 53 #define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ 54 #define LOCAL_IRQS 32 55 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ 56 (KVM_MAX_VCPUS + LOCAL_IRQS)) 57 58 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU 59 60 struct kvm_stats_debugfs_item debugfs_entries[] = { 61 { "userspace_handled", VCPU_STAT(exit_userspace) }, 62 { "exit_null", VCPU_STAT(exit_null) }, 63 { "exit_validity", VCPU_STAT(exit_validity) }, 64 { "exit_stop_request", VCPU_STAT(exit_stop_request) }, 65 { "exit_external_request", VCPU_STAT(exit_external_request) }, 66 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) }, 67 { "exit_instruction", VCPU_STAT(exit_instruction) }, 68 { "exit_pei", VCPU_STAT(exit_pei) }, 69 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) }, 70 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) }, 71 { "exit_operation_exception", VCPU_STAT(exit_operation_exception) }, 72 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, 73 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) }, 74 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) }, 75 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 76 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) }, 77 { "instruction_lctl", VCPU_STAT(instruction_lctl) }, 78 { "instruction_stctl", VCPU_STAT(instruction_stctl) }, 79 { "instruction_stctg", VCPU_STAT(instruction_stctg) }, 80 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) }, 81 { "deliver_external_call", VCPU_STAT(deliver_external_call) }, 82 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) }, 83 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) }, 84 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) }, 85 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) }, 86 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) }, 87 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) }, 88 { "exit_wait_state", VCPU_STAT(exit_wait_state) }, 89 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) }, 90 { "instruction_stidp", VCPU_STAT(instruction_stidp) }, 91 { "instruction_spx", VCPU_STAT(instruction_spx) }, 92 { "instruction_stpx", VCPU_STAT(instruction_stpx) }, 93 { "instruction_stap", VCPU_STAT(instruction_stap) }, 94 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) }, 95 { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) }, 96 { "instruction_stsch", VCPU_STAT(instruction_stsch) }, 97 { "instruction_chsc", VCPU_STAT(instruction_chsc) }, 98 { "instruction_essa", VCPU_STAT(instruction_essa) }, 99 { "instruction_stsi", VCPU_STAT(instruction_stsi) }, 100 { "instruction_stfl", VCPU_STAT(instruction_stfl) }, 101 { "instruction_tprot", VCPU_STAT(instruction_tprot) }, 102 { "instruction_sthyi", VCPU_STAT(instruction_sthyi) }, 103 { "instruction_sie", VCPU_STAT(instruction_sie) }, 104 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) }, 105 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) }, 106 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) }, 107 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) }, 108 { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) }, 109 { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) }, 110 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) }, 111 { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) }, 112 { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) }, 113 { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) }, 114 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) }, 115 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) }, 116 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) }, 117 { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) }, 118 { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) }, 119 { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) }, 120 { "diagnose_10", VCPU_STAT(diagnose_10) }, 121 { "diagnose_44", VCPU_STAT(diagnose_44) }, 122 { "diagnose_9c", VCPU_STAT(diagnose_9c) }, 123 { "diagnose_258", VCPU_STAT(diagnose_258) }, 124 { "diagnose_308", VCPU_STAT(diagnose_308) }, 125 { "diagnose_500", VCPU_STAT(diagnose_500) }, 126 { NULL } 127 }; 128 129 /* allow nested virtualization in KVM (if enabled by user space) */ 130 static int nested; 131 module_param(nested, int, S_IRUGO); 132 MODULE_PARM_DESC(nested, "Nested virtualization support"); 133 134 /* upper facilities limit for kvm */ 135 unsigned long kvm_s390_fac_list_mask[16] = { 136 0xffe6000000000000UL, 137 0x005e000000000000UL, 138 }; 139 140 unsigned long kvm_s390_fac_list_mask_size(void) 141 { 142 BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64); 143 return ARRAY_SIZE(kvm_s390_fac_list_mask); 144 } 145 146 /* available cpu features supported by kvm */ 147 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 148 /* available subfunctions indicated via query / "test bit" */ 149 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; 150 151 static struct gmap_notifier gmap_notifier; 152 static struct gmap_notifier vsie_gmap_notifier; 153 debug_info_t *kvm_s390_dbf; 154 155 /* Section: not file related */ 156 int kvm_arch_hardware_enable(void) 157 { 158 /* every s390 is virtualization enabled ;-) */ 159 return 0; 160 } 161 162 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 163 unsigned long end); 164 165 /* 166 * This callback is executed during stop_machine(). All CPUs are therefore 167 * temporarily stopped. In order not to change guest behavior, we have to 168 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 169 * so a CPU won't be stopped while calculating with the epoch. 170 */ 171 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 172 void *v) 173 { 174 struct kvm *kvm; 175 struct kvm_vcpu *vcpu; 176 int i; 177 unsigned long long *delta = v; 178 179 list_for_each_entry(kvm, &vm_list, vm_list) { 180 kvm->arch.epoch -= *delta; 181 kvm_for_each_vcpu(i, vcpu, kvm) { 182 vcpu->arch.sie_block->epoch -= *delta; 183 if (vcpu->arch.cputm_enabled) 184 vcpu->arch.cputm_start += *delta; 185 if (vcpu->arch.vsie_block) 186 vcpu->arch.vsie_block->epoch -= *delta; 187 } 188 } 189 return NOTIFY_OK; 190 } 191 192 static struct notifier_block kvm_clock_notifier = { 193 .notifier_call = kvm_clock_sync, 194 }; 195 196 int kvm_arch_hardware_setup(void) 197 { 198 gmap_notifier.notifier_call = kvm_gmap_notifier; 199 gmap_register_pte_notifier(&gmap_notifier); 200 vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier; 201 gmap_register_pte_notifier(&vsie_gmap_notifier); 202 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 203 &kvm_clock_notifier); 204 return 0; 205 } 206 207 void kvm_arch_hardware_unsetup(void) 208 { 209 gmap_unregister_pte_notifier(&gmap_notifier); 210 gmap_unregister_pte_notifier(&vsie_gmap_notifier); 211 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 212 &kvm_clock_notifier); 213 } 214 215 static void allow_cpu_feat(unsigned long nr) 216 { 217 set_bit_inv(nr, kvm_s390_available_cpu_feat); 218 } 219 220 static inline int plo_test_bit(unsigned char nr) 221 { 222 register unsigned long r0 asm("0") = (unsigned long) nr | 0x100; 223 int cc = 3; /* subfunction not available */ 224 225 asm volatile( 226 /* Parameter registers are ignored for "test bit" */ 227 " plo 0,0,0,0(0)\n" 228 " ipm %0\n" 229 " srl %0,28\n" 230 : "=d" (cc) 231 : "d" (r0) 232 : "cc"); 233 return cc == 0; 234 } 235 236 static void kvm_s390_cpu_feat_init(void) 237 { 238 int i; 239 240 for (i = 0; i < 256; ++i) { 241 if (plo_test_bit(i)) 242 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); 243 } 244 245 if (test_facility(28)) /* TOD-clock steering */ 246 ptff(kvm_s390_available_subfunc.ptff, 247 sizeof(kvm_s390_available_subfunc.ptff), 248 PTFF_QAF); 249 250 if (test_facility(17)) { /* MSA */ 251 __cpacf_query(CPACF_KMAC, kvm_s390_available_subfunc.kmac); 252 __cpacf_query(CPACF_KMC, kvm_s390_available_subfunc.kmc); 253 __cpacf_query(CPACF_KM, kvm_s390_available_subfunc.km); 254 __cpacf_query(CPACF_KIMD, kvm_s390_available_subfunc.kimd); 255 __cpacf_query(CPACF_KLMD, kvm_s390_available_subfunc.klmd); 256 } 257 if (test_facility(76)) /* MSA3 */ 258 __cpacf_query(CPACF_PCKMO, kvm_s390_available_subfunc.pckmo); 259 if (test_facility(77)) { /* MSA4 */ 260 __cpacf_query(CPACF_KMCTR, kvm_s390_available_subfunc.kmctr); 261 __cpacf_query(CPACF_KMF, kvm_s390_available_subfunc.kmf); 262 __cpacf_query(CPACF_KMO, kvm_s390_available_subfunc.kmo); 263 __cpacf_query(CPACF_PCC, kvm_s390_available_subfunc.pcc); 264 } 265 if (test_facility(57)) /* MSA5 */ 266 __cpacf_query(CPACF_PPNO, kvm_s390_available_subfunc.ppno); 267 268 if (MACHINE_HAS_ESOP) 269 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); 270 /* 271 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), 272 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). 273 */ 274 if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao || 275 !test_facility(3) || !nested) 276 return; 277 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); 278 if (sclp.has_64bscao) 279 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); 280 if (sclp.has_siif) 281 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); 282 if (sclp.has_gpere) 283 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); 284 if (sclp.has_gsls) 285 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); 286 if (sclp.has_ib) 287 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); 288 if (sclp.has_cei) 289 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); 290 if (sclp.has_ibs) 291 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); 292 /* 293 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make 294 * all skey handling functions read/set the skey from the PGSTE 295 * instead of the real storage key. 296 * 297 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make 298 * pages being detected as preserved although they are resident. 299 * 300 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will 301 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. 302 * 303 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and 304 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be 305 * correctly shadowed. We can do that for the PGSTE but not for PTE.I. 306 * 307 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We 308 * cannot easily shadow the SCA because of the ipte lock. 309 */ 310 } 311 312 int kvm_arch_init(void *opaque) 313 { 314 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 315 if (!kvm_s390_dbf) 316 return -ENOMEM; 317 318 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) { 319 debug_unregister(kvm_s390_dbf); 320 return -ENOMEM; 321 } 322 323 kvm_s390_cpu_feat_init(); 324 325 /* Register floating interrupt controller interface. */ 326 return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 327 } 328 329 void kvm_arch_exit(void) 330 { 331 debug_unregister(kvm_s390_dbf); 332 } 333 334 /* Section: device related */ 335 long kvm_arch_dev_ioctl(struct file *filp, 336 unsigned int ioctl, unsigned long arg) 337 { 338 if (ioctl == KVM_S390_ENABLE_SIE) 339 return s390_enable_sie(); 340 return -EINVAL; 341 } 342 343 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 344 { 345 int r; 346 347 switch (ext) { 348 case KVM_CAP_S390_PSW: 349 case KVM_CAP_S390_GMAP: 350 case KVM_CAP_SYNC_MMU: 351 #ifdef CONFIG_KVM_S390_UCONTROL 352 case KVM_CAP_S390_UCONTROL: 353 #endif 354 case KVM_CAP_ASYNC_PF: 355 case KVM_CAP_SYNC_REGS: 356 case KVM_CAP_ONE_REG: 357 case KVM_CAP_ENABLE_CAP: 358 case KVM_CAP_S390_CSS_SUPPORT: 359 case KVM_CAP_IOEVENTFD: 360 case KVM_CAP_DEVICE_CTRL: 361 case KVM_CAP_ENABLE_CAP_VM: 362 case KVM_CAP_S390_IRQCHIP: 363 case KVM_CAP_VM_ATTRIBUTES: 364 case KVM_CAP_MP_STATE: 365 case KVM_CAP_S390_INJECT_IRQ: 366 case KVM_CAP_S390_USER_SIGP: 367 case KVM_CAP_S390_USER_STSI: 368 case KVM_CAP_S390_SKEYS: 369 case KVM_CAP_S390_IRQ_STATE: 370 case KVM_CAP_S390_USER_INSTR0: 371 r = 1; 372 break; 373 case KVM_CAP_S390_MEM_OP: 374 r = MEM_OP_MAX_SIZE; 375 break; 376 case KVM_CAP_NR_VCPUS: 377 case KVM_CAP_MAX_VCPUS: 378 r = KVM_S390_BSCA_CPU_SLOTS; 379 if (sclp.has_esca && sclp.has_64bscao) 380 r = KVM_S390_ESCA_CPU_SLOTS; 381 break; 382 case KVM_CAP_NR_MEMSLOTS: 383 r = KVM_USER_MEM_SLOTS; 384 break; 385 case KVM_CAP_S390_COW: 386 r = MACHINE_HAS_ESOP; 387 break; 388 case KVM_CAP_S390_VECTOR_REGISTERS: 389 r = MACHINE_HAS_VX; 390 break; 391 case KVM_CAP_S390_RI: 392 r = test_facility(64); 393 break; 394 default: 395 r = 0; 396 } 397 return r; 398 } 399 400 static void kvm_s390_sync_dirty_log(struct kvm *kvm, 401 struct kvm_memory_slot *memslot) 402 { 403 gfn_t cur_gfn, last_gfn; 404 unsigned long address; 405 struct gmap *gmap = kvm->arch.gmap; 406 407 /* Loop over all guest pages */ 408 last_gfn = memslot->base_gfn + memslot->npages; 409 for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) { 410 address = gfn_to_hva_memslot(memslot, cur_gfn); 411 412 if (test_and_clear_guest_dirty(gmap->mm, address)) 413 mark_page_dirty(kvm, cur_gfn); 414 if (fatal_signal_pending(current)) 415 return; 416 cond_resched(); 417 } 418 } 419 420 /* Section: vm related */ 421 static void sca_del_vcpu(struct kvm_vcpu *vcpu); 422 423 /* 424 * Get (and clear) the dirty memory log for a memory slot. 425 */ 426 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 427 struct kvm_dirty_log *log) 428 { 429 int r; 430 unsigned long n; 431 struct kvm_memslots *slots; 432 struct kvm_memory_slot *memslot; 433 int is_dirty = 0; 434 435 mutex_lock(&kvm->slots_lock); 436 437 r = -EINVAL; 438 if (log->slot >= KVM_USER_MEM_SLOTS) 439 goto out; 440 441 slots = kvm_memslots(kvm); 442 memslot = id_to_memslot(slots, log->slot); 443 r = -ENOENT; 444 if (!memslot->dirty_bitmap) 445 goto out; 446 447 kvm_s390_sync_dirty_log(kvm, memslot); 448 r = kvm_get_dirty_log(kvm, log, &is_dirty); 449 if (r) 450 goto out; 451 452 /* Clear the dirty log */ 453 if (is_dirty) { 454 n = kvm_dirty_bitmap_bytes(memslot); 455 memset(memslot->dirty_bitmap, 0, n); 456 } 457 r = 0; 458 out: 459 mutex_unlock(&kvm->slots_lock); 460 return r; 461 } 462 463 static void icpt_operexc_on_all_vcpus(struct kvm *kvm) 464 { 465 unsigned int i; 466 struct kvm_vcpu *vcpu; 467 468 kvm_for_each_vcpu(i, vcpu, kvm) { 469 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); 470 } 471 } 472 473 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 474 { 475 int r; 476 477 if (cap->flags) 478 return -EINVAL; 479 480 switch (cap->cap) { 481 case KVM_CAP_S390_IRQCHIP: 482 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 483 kvm->arch.use_irqchip = 1; 484 r = 0; 485 break; 486 case KVM_CAP_S390_USER_SIGP: 487 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 488 kvm->arch.user_sigp = 1; 489 r = 0; 490 break; 491 case KVM_CAP_S390_VECTOR_REGISTERS: 492 mutex_lock(&kvm->lock); 493 if (kvm->created_vcpus) { 494 r = -EBUSY; 495 } else if (MACHINE_HAS_VX) { 496 set_kvm_facility(kvm->arch.model.fac_mask, 129); 497 set_kvm_facility(kvm->arch.model.fac_list, 129); 498 r = 0; 499 } else 500 r = -EINVAL; 501 mutex_unlock(&kvm->lock); 502 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 503 r ? "(not available)" : "(success)"); 504 break; 505 case KVM_CAP_S390_RI: 506 r = -EINVAL; 507 mutex_lock(&kvm->lock); 508 if (kvm->created_vcpus) { 509 r = -EBUSY; 510 } else if (test_facility(64)) { 511 set_kvm_facility(kvm->arch.model.fac_mask, 64); 512 set_kvm_facility(kvm->arch.model.fac_list, 64); 513 r = 0; 514 } 515 mutex_unlock(&kvm->lock); 516 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", 517 r ? "(not available)" : "(success)"); 518 break; 519 case KVM_CAP_S390_USER_STSI: 520 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 521 kvm->arch.user_stsi = 1; 522 r = 0; 523 break; 524 case KVM_CAP_S390_USER_INSTR0: 525 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); 526 kvm->arch.user_instr0 = 1; 527 icpt_operexc_on_all_vcpus(kvm); 528 r = 0; 529 break; 530 default: 531 r = -EINVAL; 532 break; 533 } 534 return r; 535 } 536 537 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 538 { 539 int ret; 540 541 switch (attr->attr) { 542 case KVM_S390_VM_MEM_LIMIT_SIZE: 543 ret = 0; 544 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 545 kvm->arch.mem_limit); 546 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) 547 ret = -EFAULT; 548 break; 549 default: 550 ret = -ENXIO; 551 break; 552 } 553 return ret; 554 } 555 556 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 557 { 558 int ret; 559 unsigned int idx; 560 switch (attr->attr) { 561 case KVM_S390_VM_MEM_ENABLE_CMMA: 562 ret = -ENXIO; 563 if (!sclp.has_cmma) 564 break; 565 566 ret = -EBUSY; 567 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 568 mutex_lock(&kvm->lock); 569 if (!kvm->created_vcpus) { 570 kvm->arch.use_cmma = 1; 571 ret = 0; 572 } 573 mutex_unlock(&kvm->lock); 574 break; 575 case KVM_S390_VM_MEM_CLR_CMMA: 576 ret = -ENXIO; 577 if (!sclp.has_cmma) 578 break; 579 ret = -EINVAL; 580 if (!kvm->arch.use_cmma) 581 break; 582 583 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 584 mutex_lock(&kvm->lock); 585 idx = srcu_read_lock(&kvm->srcu); 586 s390_reset_cmma(kvm->arch.gmap->mm); 587 srcu_read_unlock(&kvm->srcu, idx); 588 mutex_unlock(&kvm->lock); 589 ret = 0; 590 break; 591 case KVM_S390_VM_MEM_LIMIT_SIZE: { 592 unsigned long new_limit; 593 594 if (kvm_is_ucontrol(kvm)) 595 return -EINVAL; 596 597 if (get_user(new_limit, (u64 __user *)attr->addr)) 598 return -EFAULT; 599 600 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && 601 new_limit > kvm->arch.mem_limit) 602 return -E2BIG; 603 604 if (!new_limit) 605 return -EINVAL; 606 607 /* gmap_create takes last usable address */ 608 if (new_limit != KVM_S390_NO_MEM_LIMIT) 609 new_limit -= 1; 610 611 ret = -EBUSY; 612 mutex_lock(&kvm->lock); 613 if (!kvm->created_vcpus) { 614 /* gmap_create will round the limit up */ 615 struct gmap *new = gmap_create(current->mm, new_limit); 616 617 if (!new) { 618 ret = -ENOMEM; 619 } else { 620 gmap_remove(kvm->arch.gmap); 621 new->private = kvm; 622 kvm->arch.gmap = new; 623 ret = 0; 624 } 625 } 626 mutex_unlock(&kvm->lock); 627 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); 628 VM_EVENT(kvm, 3, "New guest asce: 0x%pK", 629 (void *) kvm->arch.gmap->asce); 630 break; 631 } 632 default: 633 ret = -ENXIO; 634 break; 635 } 636 return ret; 637 } 638 639 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 640 641 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 642 { 643 struct kvm_vcpu *vcpu; 644 int i; 645 646 if (!test_kvm_facility(kvm, 76)) 647 return -EINVAL; 648 649 mutex_lock(&kvm->lock); 650 switch (attr->attr) { 651 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 652 get_random_bytes( 653 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 654 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 655 kvm->arch.crypto.aes_kw = 1; 656 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 657 break; 658 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 659 get_random_bytes( 660 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 661 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 662 kvm->arch.crypto.dea_kw = 1; 663 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 664 break; 665 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 666 kvm->arch.crypto.aes_kw = 0; 667 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 668 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 669 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 670 break; 671 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 672 kvm->arch.crypto.dea_kw = 0; 673 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 674 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 675 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 676 break; 677 default: 678 mutex_unlock(&kvm->lock); 679 return -ENXIO; 680 } 681 682 kvm_for_each_vcpu(i, vcpu, kvm) { 683 kvm_s390_vcpu_crypto_setup(vcpu); 684 exit_sie(vcpu); 685 } 686 mutex_unlock(&kvm->lock); 687 return 0; 688 } 689 690 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 691 { 692 u8 gtod_high; 693 694 if (copy_from_user(>od_high, (void __user *)attr->addr, 695 sizeof(gtod_high))) 696 return -EFAULT; 697 698 if (gtod_high != 0) 699 return -EINVAL; 700 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 701 702 return 0; 703 } 704 705 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 706 { 707 u64 gtod; 708 709 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 710 return -EFAULT; 711 712 kvm_s390_set_tod_clock(kvm, gtod); 713 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod); 714 return 0; 715 } 716 717 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 718 { 719 int ret; 720 721 if (attr->flags) 722 return -EINVAL; 723 724 switch (attr->attr) { 725 case KVM_S390_VM_TOD_HIGH: 726 ret = kvm_s390_set_tod_high(kvm, attr); 727 break; 728 case KVM_S390_VM_TOD_LOW: 729 ret = kvm_s390_set_tod_low(kvm, attr); 730 break; 731 default: 732 ret = -ENXIO; 733 break; 734 } 735 return ret; 736 } 737 738 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 739 { 740 u8 gtod_high = 0; 741 742 if (copy_to_user((void __user *)attr->addr, >od_high, 743 sizeof(gtod_high))) 744 return -EFAULT; 745 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 746 747 return 0; 748 } 749 750 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 751 { 752 u64 gtod; 753 754 gtod = kvm_s390_get_tod_clock_fast(kvm); 755 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 756 return -EFAULT; 757 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 758 759 return 0; 760 } 761 762 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 763 { 764 int ret; 765 766 if (attr->flags) 767 return -EINVAL; 768 769 switch (attr->attr) { 770 case KVM_S390_VM_TOD_HIGH: 771 ret = kvm_s390_get_tod_high(kvm, attr); 772 break; 773 case KVM_S390_VM_TOD_LOW: 774 ret = kvm_s390_get_tod_low(kvm, attr); 775 break; 776 default: 777 ret = -ENXIO; 778 break; 779 } 780 return ret; 781 } 782 783 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 784 { 785 struct kvm_s390_vm_cpu_processor *proc; 786 u16 lowest_ibc, unblocked_ibc; 787 int ret = 0; 788 789 mutex_lock(&kvm->lock); 790 if (kvm->created_vcpus) { 791 ret = -EBUSY; 792 goto out; 793 } 794 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 795 if (!proc) { 796 ret = -ENOMEM; 797 goto out; 798 } 799 if (!copy_from_user(proc, (void __user *)attr->addr, 800 sizeof(*proc))) { 801 kvm->arch.model.cpuid = proc->cpuid; 802 lowest_ibc = sclp.ibc >> 16 & 0xfff; 803 unblocked_ibc = sclp.ibc & 0xfff; 804 if (lowest_ibc && proc->ibc) { 805 if (proc->ibc > unblocked_ibc) 806 kvm->arch.model.ibc = unblocked_ibc; 807 else if (proc->ibc < lowest_ibc) 808 kvm->arch.model.ibc = lowest_ibc; 809 else 810 kvm->arch.model.ibc = proc->ibc; 811 } 812 memcpy(kvm->arch.model.fac_list, proc->fac_list, 813 S390_ARCH_FAC_LIST_SIZE_BYTE); 814 } else 815 ret = -EFAULT; 816 kfree(proc); 817 out: 818 mutex_unlock(&kvm->lock); 819 return ret; 820 } 821 822 static int kvm_s390_set_processor_feat(struct kvm *kvm, 823 struct kvm_device_attr *attr) 824 { 825 struct kvm_s390_vm_cpu_feat data; 826 int ret = -EBUSY; 827 828 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) 829 return -EFAULT; 830 if (!bitmap_subset((unsigned long *) data.feat, 831 kvm_s390_available_cpu_feat, 832 KVM_S390_VM_CPU_FEAT_NR_BITS)) 833 return -EINVAL; 834 835 mutex_lock(&kvm->lock); 836 if (!atomic_read(&kvm->online_vcpus)) { 837 bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat, 838 KVM_S390_VM_CPU_FEAT_NR_BITS); 839 ret = 0; 840 } 841 mutex_unlock(&kvm->lock); 842 return ret; 843 } 844 845 static int kvm_s390_set_processor_subfunc(struct kvm *kvm, 846 struct kvm_device_attr *attr) 847 { 848 /* 849 * Once supported by kernel + hw, we have to store the subfunctions 850 * in kvm->arch and remember that user space configured them. 851 */ 852 return -ENXIO; 853 } 854 855 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 856 { 857 int ret = -ENXIO; 858 859 switch (attr->attr) { 860 case KVM_S390_VM_CPU_PROCESSOR: 861 ret = kvm_s390_set_processor(kvm, attr); 862 break; 863 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 864 ret = kvm_s390_set_processor_feat(kvm, attr); 865 break; 866 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 867 ret = kvm_s390_set_processor_subfunc(kvm, attr); 868 break; 869 } 870 return ret; 871 } 872 873 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 874 { 875 struct kvm_s390_vm_cpu_processor *proc; 876 int ret = 0; 877 878 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 879 if (!proc) { 880 ret = -ENOMEM; 881 goto out; 882 } 883 proc->cpuid = kvm->arch.model.cpuid; 884 proc->ibc = kvm->arch.model.ibc; 885 memcpy(&proc->fac_list, kvm->arch.model.fac_list, 886 S390_ARCH_FAC_LIST_SIZE_BYTE); 887 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 888 ret = -EFAULT; 889 kfree(proc); 890 out: 891 return ret; 892 } 893 894 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 895 { 896 struct kvm_s390_vm_cpu_machine *mach; 897 int ret = 0; 898 899 mach = kzalloc(sizeof(*mach), GFP_KERNEL); 900 if (!mach) { 901 ret = -ENOMEM; 902 goto out; 903 } 904 get_cpu_id((struct cpuid *) &mach->cpuid); 905 mach->ibc = sclp.ibc; 906 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, 907 S390_ARCH_FAC_LIST_SIZE_BYTE); 908 memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list, 909 S390_ARCH_FAC_LIST_SIZE_BYTE); 910 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 911 ret = -EFAULT; 912 kfree(mach); 913 out: 914 return ret; 915 } 916 917 static int kvm_s390_get_processor_feat(struct kvm *kvm, 918 struct kvm_device_attr *attr) 919 { 920 struct kvm_s390_vm_cpu_feat data; 921 922 bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat, 923 KVM_S390_VM_CPU_FEAT_NR_BITS); 924 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 925 return -EFAULT; 926 return 0; 927 } 928 929 static int kvm_s390_get_machine_feat(struct kvm *kvm, 930 struct kvm_device_attr *attr) 931 { 932 struct kvm_s390_vm_cpu_feat data; 933 934 bitmap_copy((unsigned long *) data.feat, 935 kvm_s390_available_cpu_feat, 936 KVM_S390_VM_CPU_FEAT_NR_BITS); 937 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 938 return -EFAULT; 939 return 0; 940 } 941 942 static int kvm_s390_get_processor_subfunc(struct kvm *kvm, 943 struct kvm_device_attr *attr) 944 { 945 /* 946 * Once we can actually configure subfunctions (kernel + hw support), 947 * we have to check if they were already set by user space, if so copy 948 * them from kvm->arch. 949 */ 950 return -ENXIO; 951 } 952 953 static int kvm_s390_get_machine_subfunc(struct kvm *kvm, 954 struct kvm_device_attr *attr) 955 { 956 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, 957 sizeof(struct kvm_s390_vm_cpu_subfunc))) 958 return -EFAULT; 959 return 0; 960 } 961 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 962 { 963 int ret = -ENXIO; 964 965 switch (attr->attr) { 966 case KVM_S390_VM_CPU_PROCESSOR: 967 ret = kvm_s390_get_processor(kvm, attr); 968 break; 969 case KVM_S390_VM_CPU_MACHINE: 970 ret = kvm_s390_get_machine(kvm, attr); 971 break; 972 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 973 ret = kvm_s390_get_processor_feat(kvm, attr); 974 break; 975 case KVM_S390_VM_CPU_MACHINE_FEAT: 976 ret = kvm_s390_get_machine_feat(kvm, attr); 977 break; 978 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 979 ret = kvm_s390_get_processor_subfunc(kvm, attr); 980 break; 981 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 982 ret = kvm_s390_get_machine_subfunc(kvm, attr); 983 break; 984 } 985 return ret; 986 } 987 988 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 989 { 990 int ret; 991 992 switch (attr->group) { 993 case KVM_S390_VM_MEM_CTRL: 994 ret = kvm_s390_set_mem_control(kvm, attr); 995 break; 996 case KVM_S390_VM_TOD: 997 ret = kvm_s390_set_tod(kvm, attr); 998 break; 999 case KVM_S390_VM_CPU_MODEL: 1000 ret = kvm_s390_set_cpu_model(kvm, attr); 1001 break; 1002 case KVM_S390_VM_CRYPTO: 1003 ret = kvm_s390_vm_set_crypto(kvm, attr); 1004 break; 1005 default: 1006 ret = -ENXIO; 1007 break; 1008 } 1009 1010 return ret; 1011 } 1012 1013 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1014 { 1015 int ret; 1016 1017 switch (attr->group) { 1018 case KVM_S390_VM_MEM_CTRL: 1019 ret = kvm_s390_get_mem_control(kvm, attr); 1020 break; 1021 case KVM_S390_VM_TOD: 1022 ret = kvm_s390_get_tod(kvm, attr); 1023 break; 1024 case KVM_S390_VM_CPU_MODEL: 1025 ret = kvm_s390_get_cpu_model(kvm, attr); 1026 break; 1027 default: 1028 ret = -ENXIO; 1029 break; 1030 } 1031 1032 return ret; 1033 } 1034 1035 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1036 { 1037 int ret; 1038 1039 switch (attr->group) { 1040 case KVM_S390_VM_MEM_CTRL: 1041 switch (attr->attr) { 1042 case KVM_S390_VM_MEM_ENABLE_CMMA: 1043 case KVM_S390_VM_MEM_CLR_CMMA: 1044 ret = sclp.has_cmma ? 0 : -ENXIO; 1045 break; 1046 case KVM_S390_VM_MEM_LIMIT_SIZE: 1047 ret = 0; 1048 break; 1049 default: 1050 ret = -ENXIO; 1051 break; 1052 } 1053 break; 1054 case KVM_S390_VM_TOD: 1055 switch (attr->attr) { 1056 case KVM_S390_VM_TOD_LOW: 1057 case KVM_S390_VM_TOD_HIGH: 1058 ret = 0; 1059 break; 1060 default: 1061 ret = -ENXIO; 1062 break; 1063 } 1064 break; 1065 case KVM_S390_VM_CPU_MODEL: 1066 switch (attr->attr) { 1067 case KVM_S390_VM_CPU_PROCESSOR: 1068 case KVM_S390_VM_CPU_MACHINE: 1069 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1070 case KVM_S390_VM_CPU_MACHINE_FEAT: 1071 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1072 ret = 0; 1073 break; 1074 /* configuring subfunctions is not supported yet */ 1075 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1076 default: 1077 ret = -ENXIO; 1078 break; 1079 } 1080 break; 1081 case KVM_S390_VM_CRYPTO: 1082 switch (attr->attr) { 1083 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 1084 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 1085 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 1086 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 1087 ret = 0; 1088 break; 1089 default: 1090 ret = -ENXIO; 1091 break; 1092 } 1093 break; 1094 default: 1095 ret = -ENXIO; 1096 break; 1097 } 1098 1099 return ret; 1100 } 1101 1102 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 1103 { 1104 uint8_t *keys; 1105 uint64_t hva; 1106 int i, r = 0; 1107 1108 if (args->flags != 0) 1109 return -EINVAL; 1110 1111 /* Is this guest using storage keys? */ 1112 if (!mm_use_skey(current->mm)) 1113 return KVM_S390_GET_SKEYS_NONE; 1114 1115 /* Enforce sane limit on memory allocation */ 1116 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 1117 return -EINVAL; 1118 1119 keys = kmalloc_array(args->count, sizeof(uint8_t), 1120 GFP_KERNEL | __GFP_NOWARN); 1121 if (!keys) 1122 keys = vmalloc(sizeof(uint8_t) * args->count); 1123 if (!keys) 1124 return -ENOMEM; 1125 1126 down_read(¤t->mm->mmap_sem); 1127 for (i = 0; i < args->count; i++) { 1128 hva = gfn_to_hva(kvm, args->start_gfn + i); 1129 if (kvm_is_error_hva(hva)) { 1130 r = -EFAULT; 1131 break; 1132 } 1133 1134 r = get_guest_storage_key(current->mm, hva, &keys[i]); 1135 if (r) 1136 break; 1137 } 1138 up_read(¤t->mm->mmap_sem); 1139 1140 if (!r) { 1141 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 1142 sizeof(uint8_t) * args->count); 1143 if (r) 1144 r = -EFAULT; 1145 } 1146 1147 kvfree(keys); 1148 return r; 1149 } 1150 1151 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 1152 { 1153 uint8_t *keys; 1154 uint64_t hva; 1155 int i, r = 0; 1156 1157 if (args->flags != 0) 1158 return -EINVAL; 1159 1160 /* Enforce sane limit on memory allocation */ 1161 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 1162 return -EINVAL; 1163 1164 keys = kmalloc_array(args->count, sizeof(uint8_t), 1165 GFP_KERNEL | __GFP_NOWARN); 1166 if (!keys) 1167 keys = vmalloc(sizeof(uint8_t) * args->count); 1168 if (!keys) 1169 return -ENOMEM; 1170 1171 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 1172 sizeof(uint8_t) * args->count); 1173 if (r) { 1174 r = -EFAULT; 1175 goto out; 1176 } 1177 1178 /* Enable storage key handling for the guest */ 1179 r = s390_enable_skey(); 1180 if (r) 1181 goto out; 1182 1183 down_read(¤t->mm->mmap_sem); 1184 for (i = 0; i < args->count; i++) { 1185 hva = gfn_to_hva(kvm, args->start_gfn + i); 1186 if (kvm_is_error_hva(hva)) { 1187 r = -EFAULT; 1188 break; 1189 } 1190 1191 /* Lowest order bit is reserved */ 1192 if (keys[i] & 0x01) { 1193 r = -EINVAL; 1194 break; 1195 } 1196 1197 r = set_guest_storage_key(current->mm, hva, keys[i], 0); 1198 if (r) 1199 break; 1200 } 1201 up_read(¤t->mm->mmap_sem); 1202 out: 1203 kvfree(keys); 1204 return r; 1205 } 1206 1207 long kvm_arch_vm_ioctl(struct file *filp, 1208 unsigned int ioctl, unsigned long arg) 1209 { 1210 struct kvm *kvm = filp->private_data; 1211 void __user *argp = (void __user *)arg; 1212 struct kvm_device_attr attr; 1213 int r; 1214 1215 switch (ioctl) { 1216 case KVM_S390_INTERRUPT: { 1217 struct kvm_s390_interrupt s390int; 1218 1219 r = -EFAULT; 1220 if (copy_from_user(&s390int, argp, sizeof(s390int))) 1221 break; 1222 r = kvm_s390_inject_vm(kvm, &s390int); 1223 break; 1224 } 1225 case KVM_ENABLE_CAP: { 1226 struct kvm_enable_cap cap; 1227 r = -EFAULT; 1228 if (copy_from_user(&cap, argp, sizeof(cap))) 1229 break; 1230 r = kvm_vm_ioctl_enable_cap(kvm, &cap); 1231 break; 1232 } 1233 case KVM_CREATE_IRQCHIP: { 1234 struct kvm_irq_routing_entry routing; 1235 1236 r = -EINVAL; 1237 if (kvm->arch.use_irqchip) { 1238 /* Set up dummy routing. */ 1239 memset(&routing, 0, sizeof(routing)); 1240 r = kvm_set_irq_routing(kvm, &routing, 0, 0); 1241 } 1242 break; 1243 } 1244 case KVM_SET_DEVICE_ATTR: { 1245 r = -EFAULT; 1246 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 1247 break; 1248 r = kvm_s390_vm_set_attr(kvm, &attr); 1249 break; 1250 } 1251 case KVM_GET_DEVICE_ATTR: { 1252 r = -EFAULT; 1253 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 1254 break; 1255 r = kvm_s390_vm_get_attr(kvm, &attr); 1256 break; 1257 } 1258 case KVM_HAS_DEVICE_ATTR: { 1259 r = -EFAULT; 1260 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 1261 break; 1262 r = kvm_s390_vm_has_attr(kvm, &attr); 1263 break; 1264 } 1265 case KVM_S390_GET_SKEYS: { 1266 struct kvm_s390_skeys args; 1267 1268 r = -EFAULT; 1269 if (copy_from_user(&args, argp, 1270 sizeof(struct kvm_s390_skeys))) 1271 break; 1272 r = kvm_s390_get_skeys(kvm, &args); 1273 break; 1274 } 1275 case KVM_S390_SET_SKEYS: { 1276 struct kvm_s390_skeys args; 1277 1278 r = -EFAULT; 1279 if (copy_from_user(&args, argp, 1280 sizeof(struct kvm_s390_skeys))) 1281 break; 1282 r = kvm_s390_set_skeys(kvm, &args); 1283 break; 1284 } 1285 default: 1286 r = -ENOTTY; 1287 } 1288 1289 return r; 1290 } 1291 1292 static int kvm_s390_query_ap_config(u8 *config) 1293 { 1294 u32 fcn_code = 0x04000000UL; 1295 u32 cc = 0; 1296 1297 memset(config, 0, 128); 1298 asm volatile( 1299 "lgr 0,%1\n" 1300 "lgr 2,%2\n" 1301 ".long 0xb2af0000\n" /* PQAP(QCI) */ 1302 "0: ipm %0\n" 1303 "srl %0,28\n" 1304 "1:\n" 1305 EX_TABLE(0b, 1b) 1306 : "+r" (cc) 1307 : "r" (fcn_code), "r" (config) 1308 : "cc", "0", "2", "memory" 1309 ); 1310 1311 return cc; 1312 } 1313 1314 static int kvm_s390_apxa_installed(void) 1315 { 1316 u8 config[128]; 1317 int cc; 1318 1319 if (test_facility(12)) { 1320 cc = kvm_s390_query_ap_config(config); 1321 1322 if (cc) 1323 pr_err("PQAP(QCI) failed with cc=%d", cc); 1324 else 1325 return config[0] & 0x40; 1326 } 1327 1328 return 0; 1329 } 1330 1331 static void kvm_s390_set_crycb_format(struct kvm *kvm) 1332 { 1333 kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb; 1334 1335 if (kvm_s390_apxa_installed()) 1336 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 1337 else 1338 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 1339 } 1340 1341 static u64 kvm_s390_get_initial_cpuid(void) 1342 { 1343 struct cpuid cpuid; 1344 1345 get_cpu_id(&cpuid); 1346 cpuid.version = 0xff; 1347 return *((u64 *) &cpuid); 1348 } 1349 1350 static void kvm_s390_crypto_init(struct kvm *kvm) 1351 { 1352 if (!test_kvm_facility(kvm, 76)) 1353 return; 1354 1355 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; 1356 kvm_s390_set_crycb_format(kvm); 1357 1358 /* Enable AES/DEA protected key functions by default */ 1359 kvm->arch.crypto.aes_kw = 1; 1360 kvm->arch.crypto.dea_kw = 1; 1361 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 1362 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1363 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 1364 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1365 } 1366 1367 static void sca_dispose(struct kvm *kvm) 1368 { 1369 if (kvm->arch.use_esca) 1370 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block)); 1371 else 1372 free_page((unsigned long)(kvm->arch.sca)); 1373 kvm->arch.sca = NULL; 1374 } 1375 1376 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 1377 { 1378 gfp_t alloc_flags = GFP_KERNEL; 1379 int i, rc; 1380 char debug_name[16]; 1381 static unsigned long sca_offset; 1382 1383 rc = -EINVAL; 1384 #ifdef CONFIG_KVM_S390_UCONTROL 1385 if (type & ~KVM_VM_S390_UCONTROL) 1386 goto out_err; 1387 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 1388 goto out_err; 1389 #else 1390 if (type) 1391 goto out_err; 1392 #endif 1393 1394 rc = s390_enable_sie(); 1395 if (rc) 1396 goto out_err; 1397 1398 rc = -ENOMEM; 1399 1400 ratelimit_state_init(&kvm->arch.sthyi_limit, 5 * HZ, 500); 1401 1402 kvm->arch.use_esca = 0; /* start with basic SCA */ 1403 if (!sclp.has_64bscao) 1404 alloc_flags |= GFP_DMA; 1405 rwlock_init(&kvm->arch.sca_lock); 1406 kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags); 1407 if (!kvm->arch.sca) 1408 goto out_err; 1409 spin_lock(&kvm_lock); 1410 sca_offset += 16; 1411 if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE) 1412 sca_offset = 0; 1413 kvm->arch.sca = (struct bsca_block *) 1414 ((char *) kvm->arch.sca + sca_offset); 1415 spin_unlock(&kvm_lock); 1416 1417 sprintf(debug_name, "kvm-%u", current->pid); 1418 1419 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 1420 if (!kvm->arch.dbf) 1421 goto out_err; 1422 1423 kvm->arch.sie_page2 = 1424 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1425 if (!kvm->arch.sie_page2) 1426 goto out_err; 1427 1428 /* Populate the facility mask initially. */ 1429 memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list, 1430 S390_ARCH_FAC_LIST_SIZE_BYTE); 1431 for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) { 1432 if (i < kvm_s390_fac_list_mask_size()) 1433 kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i]; 1434 else 1435 kvm->arch.model.fac_mask[i] = 0UL; 1436 } 1437 1438 /* Populate the facility list initially. */ 1439 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; 1440 memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask, 1441 S390_ARCH_FAC_LIST_SIZE_BYTE); 1442 1443 set_kvm_facility(kvm->arch.model.fac_mask, 74); 1444 set_kvm_facility(kvm->arch.model.fac_list, 74); 1445 1446 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); 1447 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 1448 1449 kvm_s390_crypto_init(kvm); 1450 1451 spin_lock_init(&kvm->arch.float_int.lock); 1452 for (i = 0; i < FIRQ_LIST_COUNT; i++) 1453 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 1454 init_waitqueue_head(&kvm->arch.ipte_wq); 1455 mutex_init(&kvm->arch.ipte_mutex); 1456 1457 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 1458 VM_EVENT(kvm, 3, "vm created with type %lu", type); 1459 1460 if (type & KVM_VM_S390_UCONTROL) { 1461 kvm->arch.gmap = NULL; 1462 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT; 1463 } else { 1464 if (sclp.hamax == U64_MAX) 1465 kvm->arch.mem_limit = TASK_MAX_SIZE; 1466 else 1467 kvm->arch.mem_limit = min_t(unsigned long, TASK_MAX_SIZE, 1468 sclp.hamax + 1); 1469 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1); 1470 if (!kvm->arch.gmap) 1471 goto out_err; 1472 kvm->arch.gmap->private = kvm; 1473 kvm->arch.gmap->pfault_enabled = 0; 1474 } 1475 1476 kvm->arch.css_support = 0; 1477 kvm->arch.use_irqchip = 0; 1478 kvm->arch.epoch = 0; 1479 1480 spin_lock_init(&kvm->arch.start_stop_lock); 1481 kvm_s390_vsie_init(kvm); 1482 KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid); 1483 1484 return 0; 1485 out_err: 1486 free_page((unsigned long)kvm->arch.sie_page2); 1487 debug_unregister(kvm->arch.dbf); 1488 sca_dispose(kvm); 1489 KVM_EVENT(3, "creation of vm failed: %d", rc); 1490 return rc; 1491 } 1492 1493 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 1494 { 1495 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 1496 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 1497 kvm_s390_clear_local_irqs(vcpu); 1498 kvm_clear_async_pf_completion_queue(vcpu); 1499 if (!kvm_is_ucontrol(vcpu->kvm)) 1500 sca_del_vcpu(vcpu); 1501 1502 if (kvm_is_ucontrol(vcpu->kvm)) 1503 gmap_remove(vcpu->arch.gmap); 1504 1505 if (vcpu->kvm->arch.use_cmma) 1506 kvm_s390_vcpu_unsetup_cmma(vcpu); 1507 free_page((unsigned long)(vcpu->arch.sie_block)); 1508 1509 kvm_vcpu_uninit(vcpu); 1510 kmem_cache_free(kvm_vcpu_cache, vcpu); 1511 } 1512 1513 static void kvm_free_vcpus(struct kvm *kvm) 1514 { 1515 unsigned int i; 1516 struct kvm_vcpu *vcpu; 1517 1518 kvm_for_each_vcpu(i, vcpu, kvm) 1519 kvm_arch_vcpu_destroy(vcpu); 1520 1521 mutex_lock(&kvm->lock); 1522 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 1523 kvm->vcpus[i] = NULL; 1524 1525 atomic_set(&kvm->online_vcpus, 0); 1526 mutex_unlock(&kvm->lock); 1527 } 1528 1529 void kvm_arch_destroy_vm(struct kvm *kvm) 1530 { 1531 kvm_free_vcpus(kvm); 1532 sca_dispose(kvm); 1533 debug_unregister(kvm->arch.dbf); 1534 free_page((unsigned long)kvm->arch.sie_page2); 1535 if (!kvm_is_ucontrol(kvm)) 1536 gmap_remove(kvm->arch.gmap); 1537 kvm_s390_destroy_adapters(kvm); 1538 kvm_s390_clear_float_irqs(kvm); 1539 kvm_s390_vsie_destroy(kvm); 1540 KVM_EVENT(3, "vm 0x%pK destroyed", kvm); 1541 } 1542 1543 /* Section: vcpu related */ 1544 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) 1545 { 1546 vcpu->arch.gmap = gmap_create(current->mm, -1UL); 1547 if (!vcpu->arch.gmap) 1548 return -ENOMEM; 1549 vcpu->arch.gmap->private = vcpu->kvm; 1550 1551 return 0; 1552 } 1553 1554 static void sca_del_vcpu(struct kvm_vcpu *vcpu) 1555 { 1556 read_lock(&vcpu->kvm->arch.sca_lock); 1557 if (vcpu->kvm->arch.use_esca) { 1558 struct esca_block *sca = vcpu->kvm->arch.sca; 1559 1560 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); 1561 sca->cpu[vcpu->vcpu_id].sda = 0; 1562 } else { 1563 struct bsca_block *sca = vcpu->kvm->arch.sca; 1564 1565 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); 1566 sca->cpu[vcpu->vcpu_id].sda = 0; 1567 } 1568 read_unlock(&vcpu->kvm->arch.sca_lock); 1569 } 1570 1571 static void sca_add_vcpu(struct kvm_vcpu *vcpu) 1572 { 1573 read_lock(&vcpu->kvm->arch.sca_lock); 1574 if (vcpu->kvm->arch.use_esca) { 1575 struct esca_block *sca = vcpu->kvm->arch.sca; 1576 1577 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; 1578 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 1579 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU; 1580 vcpu->arch.sie_block->ecb2 |= 0x04U; 1581 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); 1582 } else { 1583 struct bsca_block *sca = vcpu->kvm->arch.sca; 1584 1585 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; 1586 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 1587 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; 1588 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); 1589 } 1590 read_unlock(&vcpu->kvm->arch.sca_lock); 1591 } 1592 1593 /* Basic SCA to Extended SCA data copy routines */ 1594 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s) 1595 { 1596 d->sda = s->sda; 1597 d->sigp_ctrl.c = s->sigp_ctrl.c; 1598 d->sigp_ctrl.scn = s->sigp_ctrl.scn; 1599 } 1600 1601 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s) 1602 { 1603 int i; 1604 1605 d->ipte_control = s->ipte_control; 1606 d->mcn[0] = s->mcn; 1607 for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++) 1608 sca_copy_entry(&d->cpu[i], &s->cpu[i]); 1609 } 1610 1611 static int sca_switch_to_extended(struct kvm *kvm) 1612 { 1613 struct bsca_block *old_sca = kvm->arch.sca; 1614 struct esca_block *new_sca; 1615 struct kvm_vcpu *vcpu; 1616 unsigned int vcpu_idx; 1617 u32 scaol, scaoh; 1618 1619 new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO); 1620 if (!new_sca) 1621 return -ENOMEM; 1622 1623 scaoh = (u32)((u64)(new_sca) >> 32); 1624 scaol = (u32)(u64)(new_sca) & ~0x3fU; 1625 1626 kvm_s390_vcpu_block_all(kvm); 1627 write_lock(&kvm->arch.sca_lock); 1628 1629 sca_copy_b_to_e(new_sca, old_sca); 1630 1631 kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) { 1632 vcpu->arch.sie_block->scaoh = scaoh; 1633 vcpu->arch.sie_block->scaol = scaol; 1634 vcpu->arch.sie_block->ecb2 |= 0x04U; 1635 } 1636 kvm->arch.sca = new_sca; 1637 kvm->arch.use_esca = 1; 1638 1639 write_unlock(&kvm->arch.sca_lock); 1640 kvm_s390_vcpu_unblock_all(kvm); 1641 1642 free_page((unsigned long)old_sca); 1643 1644 VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)", 1645 old_sca, kvm->arch.sca); 1646 return 0; 1647 } 1648 1649 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) 1650 { 1651 int rc; 1652 1653 if (id < KVM_S390_BSCA_CPU_SLOTS) 1654 return true; 1655 if (!sclp.has_esca || !sclp.has_64bscao) 1656 return false; 1657 1658 mutex_lock(&kvm->lock); 1659 rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm); 1660 mutex_unlock(&kvm->lock); 1661 1662 return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS; 1663 } 1664 1665 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 1666 { 1667 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 1668 kvm_clear_async_pf_completion_queue(vcpu); 1669 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 1670 KVM_SYNC_GPRS | 1671 KVM_SYNC_ACRS | 1672 KVM_SYNC_CRS | 1673 KVM_SYNC_ARCH0 | 1674 KVM_SYNC_PFAULT; 1675 if (test_kvm_facility(vcpu->kvm, 64)) 1676 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; 1677 /* fprs can be synchronized via vrs, even if the guest has no vx. With 1678 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format. 1679 */ 1680 if (MACHINE_HAS_VX) 1681 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 1682 else 1683 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; 1684 1685 if (kvm_is_ucontrol(vcpu->kvm)) 1686 return __kvm_ucontrol_vcpu_init(vcpu); 1687 1688 return 0; 1689 } 1690 1691 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 1692 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) 1693 { 1694 WARN_ON_ONCE(vcpu->arch.cputm_start != 0); 1695 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 1696 vcpu->arch.cputm_start = get_tod_clock_fast(); 1697 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 1698 } 1699 1700 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 1701 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) 1702 { 1703 WARN_ON_ONCE(vcpu->arch.cputm_start == 0); 1704 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 1705 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; 1706 vcpu->arch.cputm_start = 0; 1707 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 1708 } 1709 1710 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 1711 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 1712 { 1713 WARN_ON_ONCE(vcpu->arch.cputm_enabled); 1714 vcpu->arch.cputm_enabled = true; 1715 __start_cpu_timer_accounting(vcpu); 1716 } 1717 1718 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 1719 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 1720 { 1721 WARN_ON_ONCE(!vcpu->arch.cputm_enabled); 1722 __stop_cpu_timer_accounting(vcpu); 1723 vcpu->arch.cputm_enabled = false; 1724 } 1725 1726 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 1727 { 1728 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 1729 __enable_cpu_timer_accounting(vcpu); 1730 preempt_enable(); 1731 } 1732 1733 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 1734 { 1735 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 1736 __disable_cpu_timer_accounting(vcpu); 1737 preempt_enable(); 1738 } 1739 1740 /* set the cpu timer - may only be called from the VCPU thread itself */ 1741 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) 1742 { 1743 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 1744 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 1745 if (vcpu->arch.cputm_enabled) 1746 vcpu->arch.cputm_start = get_tod_clock_fast(); 1747 vcpu->arch.sie_block->cputm = cputm; 1748 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 1749 preempt_enable(); 1750 } 1751 1752 /* update and get the cpu timer - can also be called from other VCPU threads */ 1753 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) 1754 { 1755 unsigned int seq; 1756 __u64 value; 1757 1758 if (unlikely(!vcpu->arch.cputm_enabled)) 1759 return vcpu->arch.sie_block->cputm; 1760 1761 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 1762 do { 1763 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); 1764 /* 1765 * If the writer would ever execute a read in the critical 1766 * section, e.g. in irq context, we have a deadlock. 1767 */ 1768 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); 1769 value = vcpu->arch.sie_block->cputm; 1770 /* if cputm_start is 0, accounting is being started/stopped */ 1771 if (likely(vcpu->arch.cputm_start)) 1772 value -= get_tod_clock_fast() - vcpu->arch.cputm_start; 1773 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); 1774 preempt_enable(); 1775 return value; 1776 } 1777 1778 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 1779 { 1780 /* Save host register state */ 1781 save_fpu_regs(); 1782 vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc; 1783 vcpu->arch.host_fpregs.regs = current->thread.fpu.regs; 1784 1785 if (MACHINE_HAS_VX) 1786 current->thread.fpu.regs = vcpu->run->s.regs.vrs; 1787 else 1788 current->thread.fpu.regs = vcpu->run->s.regs.fprs; 1789 current->thread.fpu.fpc = vcpu->run->s.regs.fpc; 1790 if (test_fp_ctl(current->thread.fpu.fpc)) 1791 /* User space provided an invalid FPC, let's clear it */ 1792 current->thread.fpu.fpc = 0; 1793 1794 save_access_regs(vcpu->arch.host_acrs); 1795 restore_access_regs(vcpu->run->s.regs.acrs); 1796 gmap_enable(vcpu->arch.enabled_gmap); 1797 atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); 1798 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 1799 __start_cpu_timer_accounting(vcpu); 1800 vcpu->cpu = cpu; 1801 } 1802 1803 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 1804 { 1805 vcpu->cpu = -1; 1806 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 1807 __stop_cpu_timer_accounting(vcpu); 1808 atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); 1809 vcpu->arch.enabled_gmap = gmap_get_enabled(); 1810 gmap_disable(vcpu->arch.enabled_gmap); 1811 1812 /* Save guest register state */ 1813 save_fpu_regs(); 1814 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 1815 1816 /* Restore host register state */ 1817 current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc; 1818 current->thread.fpu.regs = vcpu->arch.host_fpregs.regs; 1819 1820 save_access_regs(vcpu->run->s.regs.acrs); 1821 restore_access_regs(vcpu->arch.host_acrs); 1822 } 1823 1824 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) 1825 { 1826 /* this equals initial cpu reset in pop, but we don't switch to ESA */ 1827 vcpu->arch.sie_block->gpsw.mask = 0UL; 1828 vcpu->arch.sie_block->gpsw.addr = 0UL; 1829 kvm_s390_set_prefix(vcpu, 0); 1830 kvm_s390_set_cpu_timer(vcpu, 0); 1831 vcpu->arch.sie_block->ckc = 0UL; 1832 vcpu->arch.sie_block->todpr = 0; 1833 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); 1834 vcpu->arch.sie_block->gcr[0] = 0xE0UL; 1835 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL; 1836 /* make sure the new fpc will be lazily loaded */ 1837 save_fpu_regs(); 1838 current->thread.fpu.fpc = 0; 1839 vcpu->arch.sie_block->gbea = 1; 1840 vcpu->arch.sie_block->pp = 0; 1841 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 1842 kvm_clear_async_pf_completion_queue(vcpu); 1843 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 1844 kvm_s390_vcpu_stop(vcpu); 1845 kvm_s390_clear_local_irqs(vcpu); 1846 } 1847 1848 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 1849 { 1850 mutex_lock(&vcpu->kvm->lock); 1851 preempt_disable(); 1852 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 1853 preempt_enable(); 1854 mutex_unlock(&vcpu->kvm->lock); 1855 if (!kvm_is_ucontrol(vcpu->kvm)) { 1856 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 1857 sca_add_vcpu(vcpu); 1858 } 1859 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0) 1860 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 1861 /* make vcpu_load load the right gmap on the first trigger */ 1862 vcpu->arch.enabled_gmap = vcpu->arch.gmap; 1863 } 1864 1865 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 1866 { 1867 if (!test_kvm_facility(vcpu->kvm, 76)) 1868 return; 1869 1870 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 1871 1872 if (vcpu->kvm->arch.crypto.aes_kw) 1873 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 1874 if (vcpu->kvm->arch.crypto.dea_kw) 1875 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 1876 1877 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 1878 } 1879 1880 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 1881 { 1882 free_page(vcpu->arch.sie_block->cbrlo); 1883 vcpu->arch.sie_block->cbrlo = 0; 1884 } 1885 1886 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 1887 { 1888 vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL); 1889 if (!vcpu->arch.sie_block->cbrlo) 1890 return -ENOMEM; 1891 1892 vcpu->arch.sie_block->ecb2 |= 0x80; 1893 vcpu->arch.sie_block->ecb2 &= ~0x08; 1894 return 0; 1895 } 1896 1897 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 1898 { 1899 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 1900 1901 vcpu->arch.sie_block->ibc = model->ibc; 1902 if (test_kvm_facility(vcpu->kvm, 7)) 1903 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list; 1904 } 1905 1906 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 1907 { 1908 int rc = 0; 1909 1910 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 1911 CPUSTAT_SM | 1912 CPUSTAT_STOPPED); 1913 1914 if (test_kvm_facility(vcpu->kvm, 78)) 1915 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags); 1916 else if (test_kvm_facility(vcpu->kvm, 8)) 1917 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags); 1918 1919 kvm_s390_vcpu_setup_model(vcpu); 1920 1921 /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */ 1922 if (MACHINE_HAS_ESOP) 1923 vcpu->arch.sie_block->ecb |= 0x02; 1924 if (test_kvm_facility(vcpu->kvm, 9)) 1925 vcpu->arch.sie_block->ecb |= 0x04; 1926 if (test_kvm_facility(vcpu->kvm, 73)) 1927 vcpu->arch.sie_block->ecb |= 0x10; 1928 1929 if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi) 1930 vcpu->arch.sie_block->ecb2 |= 0x08; 1931 vcpu->arch.sie_block->eca = 0x1002000U; 1932 if (sclp.has_cei) 1933 vcpu->arch.sie_block->eca |= 0x80000000U; 1934 if (sclp.has_ib) 1935 vcpu->arch.sie_block->eca |= 0x40000000U; 1936 if (sclp.has_siif) 1937 vcpu->arch.sie_block->eca |= 1; 1938 if (sclp.has_sigpif) 1939 vcpu->arch.sie_block->eca |= 0x10000000U; 1940 if (test_kvm_facility(vcpu->kvm, 64)) 1941 vcpu->arch.sie_block->ecb3 |= 0x01; 1942 if (test_kvm_facility(vcpu->kvm, 129)) { 1943 vcpu->arch.sie_block->eca |= 0x00020000; 1944 vcpu->arch.sie_block->ecd |= 0x20000000; 1945 } 1946 vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb; 1947 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 1948 1949 if (vcpu->kvm->arch.use_cmma) { 1950 rc = kvm_s390_vcpu_setup_cmma(vcpu); 1951 if (rc) 1952 return rc; 1953 } 1954 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 1955 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; 1956 1957 kvm_s390_vcpu_crypto_setup(vcpu); 1958 1959 return rc; 1960 } 1961 1962 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 1963 unsigned int id) 1964 { 1965 struct kvm_vcpu *vcpu; 1966 struct sie_page *sie_page; 1967 int rc = -EINVAL; 1968 1969 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) 1970 goto out; 1971 1972 rc = -ENOMEM; 1973 1974 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); 1975 if (!vcpu) 1976 goto out; 1977 1978 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL); 1979 if (!sie_page) 1980 goto out_free_cpu; 1981 1982 vcpu->arch.sie_block = &sie_page->sie_block; 1983 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; 1984 1985 /* the real guest size will always be smaller than msl */ 1986 vcpu->arch.sie_block->mso = 0; 1987 vcpu->arch.sie_block->msl = sclp.hamax; 1988 1989 vcpu->arch.sie_block->icpua = id; 1990 spin_lock_init(&vcpu->arch.local_int.lock); 1991 vcpu->arch.local_int.float_int = &kvm->arch.float_int; 1992 vcpu->arch.local_int.wq = &vcpu->wq; 1993 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags; 1994 seqcount_init(&vcpu->arch.cputm_seqcount); 1995 1996 rc = kvm_vcpu_init(vcpu, kvm, id); 1997 if (rc) 1998 goto out_free_sie_block; 1999 VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu, 2000 vcpu->arch.sie_block); 2001 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); 2002 2003 return vcpu; 2004 out_free_sie_block: 2005 free_page((unsigned long)(vcpu->arch.sie_block)); 2006 out_free_cpu: 2007 kmem_cache_free(kvm_vcpu_cache, vcpu); 2008 out: 2009 return ERR_PTR(rc); 2010 } 2011 2012 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 2013 { 2014 return kvm_s390_vcpu_has_irq(vcpu, 0); 2015 } 2016 2017 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 2018 { 2019 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 2020 exit_sie(vcpu); 2021 } 2022 2023 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 2024 { 2025 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 2026 } 2027 2028 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 2029 { 2030 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 2031 exit_sie(vcpu); 2032 } 2033 2034 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 2035 { 2036 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 2037 } 2038 2039 /* 2040 * Kick a guest cpu out of SIE and wait until SIE is not running. 2041 * If the CPU is not running (e.g. waiting as idle) the function will 2042 * return immediately. */ 2043 void exit_sie(struct kvm_vcpu *vcpu) 2044 { 2045 atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags); 2046 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 2047 cpu_relax(); 2048 } 2049 2050 /* Kick a guest cpu out of SIE to process a request synchronously */ 2051 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 2052 { 2053 kvm_make_request(req, vcpu); 2054 kvm_s390_vcpu_request(vcpu); 2055 } 2056 2057 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 2058 unsigned long end) 2059 { 2060 struct kvm *kvm = gmap->private; 2061 struct kvm_vcpu *vcpu; 2062 unsigned long prefix; 2063 int i; 2064 2065 if (gmap_is_shadow(gmap)) 2066 return; 2067 if (start >= 1UL << 31) 2068 /* We are only interested in prefix pages */ 2069 return; 2070 kvm_for_each_vcpu(i, vcpu, kvm) { 2071 /* match against both prefix pages */ 2072 prefix = kvm_s390_get_prefix(vcpu); 2073 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) { 2074 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx", 2075 start, end); 2076 kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu); 2077 } 2078 } 2079 } 2080 2081 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 2082 { 2083 /* kvm common code refers to this, but never calls it */ 2084 BUG(); 2085 return 0; 2086 } 2087 2088 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 2089 struct kvm_one_reg *reg) 2090 { 2091 int r = -EINVAL; 2092 2093 switch (reg->id) { 2094 case KVM_REG_S390_TODPR: 2095 r = put_user(vcpu->arch.sie_block->todpr, 2096 (u32 __user *)reg->addr); 2097 break; 2098 case KVM_REG_S390_EPOCHDIFF: 2099 r = put_user(vcpu->arch.sie_block->epoch, 2100 (u64 __user *)reg->addr); 2101 break; 2102 case KVM_REG_S390_CPU_TIMER: 2103 r = put_user(kvm_s390_get_cpu_timer(vcpu), 2104 (u64 __user *)reg->addr); 2105 break; 2106 case KVM_REG_S390_CLOCK_COMP: 2107 r = put_user(vcpu->arch.sie_block->ckc, 2108 (u64 __user *)reg->addr); 2109 break; 2110 case KVM_REG_S390_PFTOKEN: 2111 r = put_user(vcpu->arch.pfault_token, 2112 (u64 __user *)reg->addr); 2113 break; 2114 case KVM_REG_S390_PFCOMPARE: 2115 r = put_user(vcpu->arch.pfault_compare, 2116 (u64 __user *)reg->addr); 2117 break; 2118 case KVM_REG_S390_PFSELECT: 2119 r = put_user(vcpu->arch.pfault_select, 2120 (u64 __user *)reg->addr); 2121 break; 2122 case KVM_REG_S390_PP: 2123 r = put_user(vcpu->arch.sie_block->pp, 2124 (u64 __user *)reg->addr); 2125 break; 2126 case KVM_REG_S390_GBEA: 2127 r = put_user(vcpu->arch.sie_block->gbea, 2128 (u64 __user *)reg->addr); 2129 break; 2130 default: 2131 break; 2132 } 2133 2134 return r; 2135 } 2136 2137 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 2138 struct kvm_one_reg *reg) 2139 { 2140 int r = -EINVAL; 2141 __u64 val; 2142 2143 switch (reg->id) { 2144 case KVM_REG_S390_TODPR: 2145 r = get_user(vcpu->arch.sie_block->todpr, 2146 (u32 __user *)reg->addr); 2147 break; 2148 case KVM_REG_S390_EPOCHDIFF: 2149 r = get_user(vcpu->arch.sie_block->epoch, 2150 (u64 __user *)reg->addr); 2151 break; 2152 case KVM_REG_S390_CPU_TIMER: 2153 r = get_user(val, (u64 __user *)reg->addr); 2154 if (!r) 2155 kvm_s390_set_cpu_timer(vcpu, val); 2156 break; 2157 case KVM_REG_S390_CLOCK_COMP: 2158 r = get_user(vcpu->arch.sie_block->ckc, 2159 (u64 __user *)reg->addr); 2160 break; 2161 case KVM_REG_S390_PFTOKEN: 2162 r = get_user(vcpu->arch.pfault_token, 2163 (u64 __user *)reg->addr); 2164 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 2165 kvm_clear_async_pf_completion_queue(vcpu); 2166 break; 2167 case KVM_REG_S390_PFCOMPARE: 2168 r = get_user(vcpu->arch.pfault_compare, 2169 (u64 __user *)reg->addr); 2170 break; 2171 case KVM_REG_S390_PFSELECT: 2172 r = get_user(vcpu->arch.pfault_select, 2173 (u64 __user *)reg->addr); 2174 break; 2175 case KVM_REG_S390_PP: 2176 r = get_user(vcpu->arch.sie_block->pp, 2177 (u64 __user *)reg->addr); 2178 break; 2179 case KVM_REG_S390_GBEA: 2180 r = get_user(vcpu->arch.sie_block->gbea, 2181 (u64 __user *)reg->addr); 2182 break; 2183 default: 2184 break; 2185 } 2186 2187 return r; 2188 } 2189 2190 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 2191 { 2192 kvm_s390_vcpu_initial_reset(vcpu); 2193 return 0; 2194 } 2195 2196 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 2197 { 2198 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 2199 return 0; 2200 } 2201 2202 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 2203 { 2204 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 2205 return 0; 2206 } 2207 2208 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 2209 struct kvm_sregs *sregs) 2210 { 2211 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 2212 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 2213 restore_access_regs(vcpu->run->s.regs.acrs); 2214 return 0; 2215 } 2216 2217 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 2218 struct kvm_sregs *sregs) 2219 { 2220 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 2221 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 2222 return 0; 2223 } 2224 2225 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 2226 { 2227 /* make sure the new values will be lazily loaded */ 2228 save_fpu_regs(); 2229 if (test_fp_ctl(fpu->fpc)) 2230 return -EINVAL; 2231 current->thread.fpu.fpc = fpu->fpc; 2232 if (MACHINE_HAS_VX) 2233 convert_fp_to_vx(current->thread.fpu.vxrs, (freg_t *)fpu->fprs); 2234 else 2235 memcpy(current->thread.fpu.fprs, &fpu->fprs, sizeof(fpu->fprs)); 2236 return 0; 2237 } 2238 2239 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 2240 { 2241 /* make sure we have the latest values */ 2242 save_fpu_regs(); 2243 if (MACHINE_HAS_VX) 2244 convert_vx_to_fp((freg_t *)fpu->fprs, current->thread.fpu.vxrs); 2245 else 2246 memcpy(fpu->fprs, current->thread.fpu.fprs, sizeof(fpu->fprs)); 2247 fpu->fpc = current->thread.fpu.fpc; 2248 return 0; 2249 } 2250 2251 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 2252 { 2253 int rc = 0; 2254 2255 if (!is_vcpu_stopped(vcpu)) 2256 rc = -EBUSY; 2257 else { 2258 vcpu->run->psw_mask = psw.mask; 2259 vcpu->run->psw_addr = psw.addr; 2260 } 2261 return rc; 2262 } 2263 2264 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 2265 struct kvm_translation *tr) 2266 { 2267 return -EINVAL; /* not implemented yet */ 2268 } 2269 2270 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 2271 KVM_GUESTDBG_USE_HW_BP | \ 2272 KVM_GUESTDBG_ENABLE) 2273 2274 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 2275 struct kvm_guest_debug *dbg) 2276 { 2277 int rc = 0; 2278 2279 vcpu->guest_debug = 0; 2280 kvm_s390_clear_bp_data(vcpu); 2281 2282 if (dbg->control & ~VALID_GUESTDBG_FLAGS) 2283 return -EINVAL; 2284 if (!sclp.has_gpere) 2285 return -EINVAL; 2286 2287 if (dbg->control & KVM_GUESTDBG_ENABLE) { 2288 vcpu->guest_debug = dbg->control; 2289 /* enforce guest PER */ 2290 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); 2291 2292 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) 2293 rc = kvm_s390_import_bp_data(vcpu, dbg); 2294 } else { 2295 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); 2296 vcpu->arch.guestdbg.last_bp = 0; 2297 } 2298 2299 if (rc) { 2300 vcpu->guest_debug = 0; 2301 kvm_s390_clear_bp_data(vcpu); 2302 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); 2303 } 2304 2305 return rc; 2306 } 2307 2308 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 2309 struct kvm_mp_state *mp_state) 2310 { 2311 /* CHECK_STOP and LOAD are not supported yet */ 2312 return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 2313 KVM_MP_STATE_OPERATING; 2314 } 2315 2316 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 2317 struct kvm_mp_state *mp_state) 2318 { 2319 int rc = 0; 2320 2321 /* user space knows about this interface - let it control the state */ 2322 vcpu->kvm->arch.user_cpu_state_ctrl = 1; 2323 2324 switch (mp_state->mp_state) { 2325 case KVM_MP_STATE_STOPPED: 2326 kvm_s390_vcpu_stop(vcpu); 2327 break; 2328 case KVM_MP_STATE_OPERATING: 2329 kvm_s390_vcpu_start(vcpu); 2330 break; 2331 case KVM_MP_STATE_LOAD: 2332 case KVM_MP_STATE_CHECK_STOP: 2333 /* fall through - CHECK_STOP and LOAD are not supported yet */ 2334 default: 2335 rc = -ENXIO; 2336 } 2337 2338 return rc; 2339 } 2340 2341 static bool ibs_enabled(struct kvm_vcpu *vcpu) 2342 { 2343 return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS; 2344 } 2345 2346 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 2347 { 2348 retry: 2349 kvm_s390_vcpu_request_handled(vcpu); 2350 if (!vcpu->requests) 2351 return 0; 2352 /* 2353 * We use MMU_RELOAD just to re-arm the ipte notifier for the 2354 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. 2355 * This ensures that the ipte instruction for this request has 2356 * already finished. We might race against a second unmapper that 2357 * wants to set the blocking bit. Lets just retry the request loop. 2358 */ 2359 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) { 2360 int rc; 2361 rc = gmap_mprotect_notify(vcpu->arch.gmap, 2362 kvm_s390_get_prefix(vcpu), 2363 PAGE_SIZE * 2, PROT_WRITE); 2364 if (rc) 2365 return rc; 2366 goto retry; 2367 } 2368 2369 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 2370 vcpu->arch.sie_block->ihcpu = 0xffff; 2371 goto retry; 2372 } 2373 2374 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 2375 if (!ibs_enabled(vcpu)) { 2376 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 2377 atomic_or(CPUSTAT_IBS, 2378 &vcpu->arch.sie_block->cpuflags); 2379 } 2380 goto retry; 2381 } 2382 2383 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 2384 if (ibs_enabled(vcpu)) { 2385 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 2386 atomic_andnot(CPUSTAT_IBS, 2387 &vcpu->arch.sie_block->cpuflags); 2388 } 2389 goto retry; 2390 } 2391 2392 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { 2393 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 2394 goto retry; 2395 } 2396 2397 /* nothing to do, just clear the request */ 2398 clear_bit(KVM_REQ_UNHALT, &vcpu->requests); 2399 2400 return 0; 2401 } 2402 2403 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod) 2404 { 2405 struct kvm_vcpu *vcpu; 2406 int i; 2407 2408 mutex_lock(&kvm->lock); 2409 preempt_disable(); 2410 kvm->arch.epoch = tod - get_tod_clock(); 2411 kvm_s390_vcpu_block_all(kvm); 2412 kvm_for_each_vcpu(i, vcpu, kvm) 2413 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 2414 kvm_s390_vcpu_unblock_all(kvm); 2415 preempt_enable(); 2416 mutex_unlock(&kvm->lock); 2417 } 2418 2419 /** 2420 * kvm_arch_fault_in_page - fault-in guest page if necessary 2421 * @vcpu: The corresponding virtual cpu 2422 * @gpa: Guest physical address 2423 * @writable: Whether the page should be writable or not 2424 * 2425 * Make sure that a guest page has been faulted-in on the host. 2426 * 2427 * Return: Zero on success, negative error code otherwise. 2428 */ 2429 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable) 2430 { 2431 return gmap_fault(vcpu->arch.gmap, gpa, 2432 writable ? FAULT_FLAG_WRITE : 0); 2433 } 2434 2435 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 2436 unsigned long token) 2437 { 2438 struct kvm_s390_interrupt inti; 2439 struct kvm_s390_irq irq; 2440 2441 if (start_token) { 2442 irq.u.ext.ext_params2 = token; 2443 irq.type = KVM_S390_INT_PFAULT_INIT; 2444 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 2445 } else { 2446 inti.type = KVM_S390_INT_PFAULT_DONE; 2447 inti.parm64 = token; 2448 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); 2449 } 2450 } 2451 2452 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 2453 struct kvm_async_pf *work) 2454 { 2455 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 2456 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 2457 } 2458 2459 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 2460 struct kvm_async_pf *work) 2461 { 2462 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 2463 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 2464 } 2465 2466 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 2467 struct kvm_async_pf *work) 2468 { 2469 /* s390 will always inject the page directly */ 2470 } 2471 2472 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 2473 { 2474 /* 2475 * s390 will always inject the page directly, 2476 * but we still want check_async_completion to cleanup 2477 */ 2478 return true; 2479 } 2480 2481 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 2482 { 2483 hva_t hva; 2484 struct kvm_arch_async_pf arch; 2485 int rc; 2486 2487 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 2488 return 0; 2489 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 2490 vcpu->arch.pfault_compare) 2491 return 0; 2492 if (psw_extint_disabled(vcpu)) 2493 return 0; 2494 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 2495 return 0; 2496 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) 2497 return 0; 2498 if (!vcpu->arch.gmap->pfault_enabled) 2499 return 0; 2500 2501 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); 2502 hva += current->thread.gmap_addr & ~PAGE_MASK; 2503 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 2504 return 0; 2505 2506 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); 2507 return rc; 2508 } 2509 2510 static int vcpu_pre_run(struct kvm_vcpu *vcpu) 2511 { 2512 int rc, cpuflags; 2513 2514 /* 2515 * On s390 notifications for arriving pages will be delivered directly 2516 * to the guest but the house keeping for completed pfaults is 2517 * handled outside the worker. 2518 */ 2519 kvm_check_async_pf_completion(vcpu); 2520 2521 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; 2522 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; 2523 2524 if (need_resched()) 2525 schedule(); 2526 2527 if (test_cpu_flag(CIF_MCCK_PENDING)) 2528 s390_handle_mcck(); 2529 2530 if (!kvm_is_ucontrol(vcpu->kvm)) { 2531 rc = kvm_s390_deliver_pending_interrupts(vcpu); 2532 if (rc) 2533 return rc; 2534 } 2535 2536 rc = kvm_s390_handle_requests(vcpu); 2537 if (rc) 2538 return rc; 2539 2540 if (guestdbg_enabled(vcpu)) { 2541 kvm_s390_backup_guest_per_regs(vcpu); 2542 kvm_s390_patch_guest_per_regs(vcpu); 2543 } 2544 2545 vcpu->arch.sie_block->icptcode = 0; 2546 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 2547 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 2548 trace_kvm_s390_sie_enter(vcpu, cpuflags); 2549 2550 return 0; 2551 } 2552 2553 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu) 2554 { 2555 struct kvm_s390_pgm_info pgm_info = { 2556 .code = PGM_ADDRESSING, 2557 }; 2558 u8 opcode, ilen; 2559 int rc; 2560 2561 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 2562 trace_kvm_s390_sie_fault(vcpu); 2563 2564 /* 2565 * We want to inject an addressing exception, which is defined as a 2566 * suppressing or terminating exception. However, since we came here 2567 * by a DAT access exception, the PSW still points to the faulting 2568 * instruction since DAT exceptions are nullifying. So we've got 2569 * to look up the current opcode to get the length of the instruction 2570 * to be able to forward the PSW. 2571 */ 2572 rc = read_guest_instr(vcpu, &opcode, 1); 2573 ilen = insn_length(opcode); 2574 if (rc < 0) { 2575 return rc; 2576 } else if (rc) { 2577 /* Instruction-Fetching Exceptions - we can't detect the ilen. 2578 * Forward by arbitrary ilc, injection will take care of 2579 * nullification if necessary. 2580 */ 2581 pgm_info = vcpu->arch.pgm; 2582 ilen = 4; 2583 } 2584 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; 2585 kvm_s390_forward_psw(vcpu, ilen); 2586 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 2587 } 2588 2589 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) 2590 { 2591 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 2592 vcpu->arch.sie_block->icptcode); 2593 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 2594 2595 if (guestdbg_enabled(vcpu)) 2596 kvm_s390_restore_guest_per_regs(vcpu); 2597 2598 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; 2599 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; 2600 2601 if (vcpu->arch.sie_block->icptcode > 0) { 2602 int rc = kvm_handle_sie_intercept(vcpu); 2603 2604 if (rc != -EOPNOTSUPP) 2605 return rc; 2606 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; 2607 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 2608 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 2609 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 2610 return -EREMOTE; 2611 } else if (exit_reason != -EFAULT) { 2612 vcpu->stat.exit_null++; 2613 return 0; 2614 } else if (kvm_is_ucontrol(vcpu->kvm)) { 2615 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 2616 vcpu->run->s390_ucontrol.trans_exc_code = 2617 current->thread.gmap_addr; 2618 vcpu->run->s390_ucontrol.pgm_code = 0x10; 2619 return -EREMOTE; 2620 } else if (current->thread.gmap_pfault) { 2621 trace_kvm_s390_major_guest_pfault(vcpu); 2622 current->thread.gmap_pfault = 0; 2623 if (kvm_arch_setup_async_pf(vcpu)) 2624 return 0; 2625 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1); 2626 } 2627 return vcpu_post_run_fault_in_sie(vcpu); 2628 } 2629 2630 static int __vcpu_run(struct kvm_vcpu *vcpu) 2631 { 2632 int rc, exit_reason; 2633 2634 /* 2635 * We try to hold kvm->srcu during most of vcpu_run (except when run- 2636 * ning the guest), so that memslots (and other stuff) are protected 2637 */ 2638 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2639 2640 do { 2641 rc = vcpu_pre_run(vcpu); 2642 if (rc) 2643 break; 2644 2645 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 2646 /* 2647 * As PF_VCPU will be used in fault handler, between 2648 * guest_enter and guest_exit should be no uaccess. 2649 */ 2650 local_irq_disable(); 2651 guest_enter_irqoff(); 2652 __disable_cpu_timer_accounting(vcpu); 2653 local_irq_enable(); 2654 exit_reason = sie64a(vcpu->arch.sie_block, 2655 vcpu->run->s.regs.gprs); 2656 local_irq_disable(); 2657 __enable_cpu_timer_accounting(vcpu); 2658 guest_exit_irqoff(); 2659 local_irq_enable(); 2660 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2661 2662 rc = vcpu_post_run(vcpu, exit_reason); 2663 } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); 2664 2665 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 2666 return rc; 2667 } 2668 2669 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 2670 { 2671 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 2672 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 2673 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 2674 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 2675 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 2676 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 2677 /* some control register changes require a tlb flush */ 2678 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 2679 } 2680 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 2681 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); 2682 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 2683 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 2684 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 2685 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 2686 } 2687 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 2688 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 2689 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 2690 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 2691 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 2692 kvm_clear_async_pf_completion_queue(vcpu); 2693 } 2694 kvm_run->kvm_dirty_regs = 0; 2695 } 2696 2697 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 2698 { 2699 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 2700 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 2701 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 2702 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 2703 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); 2704 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 2705 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 2706 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 2707 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 2708 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 2709 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 2710 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 2711 } 2712 2713 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 2714 { 2715 int rc; 2716 sigset_t sigsaved; 2717 2718 if (guestdbg_exit_pending(vcpu)) { 2719 kvm_s390_prepare_debug_exit(vcpu); 2720 return 0; 2721 } 2722 2723 if (vcpu->sigset_active) 2724 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 2725 2726 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 2727 kvm_s390_vcpu_start(vcpu); 2728 } else if (is_vcpu_stopped(vcpu)) { 2729 pr_err_ratelimited("can't run stopped vcpu %d\n", 2730 vcpu->vcpu_id); 2731 return -EINVAL; 2732 } 2733 2734 sync_regs(vcpu, kvm_run); 2735 enable_cpu_timer_accounting(vcpu); 2736 2737 might_fault(); 2738 rc = __vcpu_run(vcpu); 2739 2740 if (signal_pending(current) && !rc) { 2741 kvm_run->exit_reason = KVM_EXIT_INTR; 2742 rc = -EINTR; 2743 } 2744 2745 if (guestdbg_exit_pending(vcpu) && !rc) { 2746 kvm_s390_prepare_debug_exit(vcpu); 2747 rc = 0; 2748 } 2749 2750 if (rc == -EREMOTE) { 2751 /* userspace support is needed, kvm_run has been prepared */ 2752 rc = 0; 2753 } 2754 2755 disable_cpu_timer_accounting(vcpu); 2756 store_regs(vcpu, kvm_run); 2757 2758 if (vcpu->sigset_active) 2759 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 2760 2761 vcpu->stat.exit_userspace++; 2762 return rc; 2763 } 2764 2765 /* 2766 * store status at address 2767 * we use have two special cases: 2768 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 2769 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 2770 */ 2771 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 2772 { 2773 unsigned char archmode = 1; 2774 freg_t fprs[NUM_FPRS]; 2775 unsigned int px; 2776 u64 clkcomp, cputm; 2777 int rc; 2778 2779 px = kvm_s390_get_prefix(vcpu); 2780 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 2781 if (write_guest_abs(vcpu, 163, &archmode, 1)) 2782 return -EFAULT; 2783 gpa = 0; 2784 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 2785 if (write_guest_real(vcpu, 163, &archmode, 1)) 2786 return -EFAULT; 2787 gpa = px; 2788 } else 2789 gpa -= __LC_FPREGS_SAVE_AREA; 2790 2791 /* manually convert vector registers if necessary */ 2792 if (MACHINE_HAS_VX) { 2793 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 2794 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 2795 fprs, 128); 2796 } else { 2797 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 2798 vcpu->run->s.regs.fprs, 128); 2799 } 2800 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 2801 vcpu->run->s.regs.gprs, 128); 2802 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 2803 &vcpu->arch.sie_block->gpsw, 16); 2804 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 2805 &px, 4); 2806 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 2807 &vcpu->run->s.regs.fpc, 4); 2808 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 2809 &vcpu->arch.sie_block->todpr, 4); 2810 cputm = kvm_s390_get_cpu_timer(vcpu); 2811 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 2812 &cputm, 8); 2813 clkcomp = vcpu->arch.sie_block->ckc >> 8; 2814 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 2815 &clkcomp, 8); 2816 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 2817 &vcpu->run->s.regs.acrs, 64); 2818 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 2819 &vcpu->arch.sie_block->gcr, 128); 2820 return rc ? -EFAULT : 0; 2821 } 2822 2823 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 2824 { 2825 /* 2826 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 2827 * copying in vcpu load/put. Lets update our copies before we save 2828 * it into the save area 2829 */ 2830 save_fpu_regs(); 2831 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 2832 save_access_regs(vcpu->run->s.regs.acrs); 2833 2834 return kvm_s390_store_status_unloaded(vcpu, addr); 2835 } 2836 2837 /* 2838 * store additional status at address 2839 */ 2840 int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu, 2841 unsigned long gpa) 2842 { 2843 /* Only bits 0-53 are used for address formation */ 2844 if (!(gpa & ~0x3ff)) 2845 return 0; 2846 2847 return write_guest_abs(vcpu, gpa & ~0x3ff, 2848 (void *)&vcpu->run->s.regs.vrs, 512); 2849 } 2850 2851 int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr) 2852 { 2853 if (!test_kvm_facility(vcpu->kvm, 129)) 2854 return 0; 2855 2856 /* 2857 * The guest VXRS are in the host VXRs due to the lazy 2858 * copying in vcpu load/put. We can simply call save_fpu_regs() 2859 * to save the current register state because we are in the 2860 * middle of a load/put cycle. 2861 * 2862 * Let's update our copies before we save it into the save area. 2863 */ 2864 save_fpu_regs(); 2865 2866 return kvm_s390_store_adtl_status_unloaded(vcpu, addr); 2867 } 2868 2869 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 2870 { 2871 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 2872 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 2873 } 2874 2875 static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 2876 { 2877 unsigned int i; 2878 struct kvm_vcpu *vcpu; 2879 2880 kvm_for_each_vcpu(i, vcpu, kvm) { 2881 __disable_ibs_on_vcpu(vcpu); 2882 } 2883 } 2884 2885 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 2886 { 2887 if (!sclp.has_ibs) 2888 return; 2889 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 2890 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 2891 } 2892 2893 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 2894 { 2895 int i, online_vcpus, started_vcpus = 0; 2896 2897 if (!is_vcpu_stopped(vcpu)) 2898 return; 2899 2900 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 2901 /* Only one cpu at a time may enter/leave the STOPPED state. */ 2902 spin_lock(&vcpu->kvm->arch.start_stop_lock); 2903 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 2904 2905 for (i = 0; i < online_vcpus; i++) { 2906 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) 2907 started_vcpus++; 2908 } 2909 2910 if (started_vcpus == 0) { 2911 /* we're the only active VCPU -> speed it up */ 2912 __enable_ibs_on_vcpu(vcpu); 2913 } else if (started_vcpus == 1) { 2914 /* 2915 * As we are starting a second VCPU, we have to disable 2916 * the IBS facility on all VCPUs to remove potentially 2917 * oustanding ENABLE requests. 2918 */ 2919 __disable_ibs_on_all_vcpus(vcpu->kvm); 2920 } 2921 2922 atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); 2923 /* 2924 * Another VCPU might have used IBS while we were offline. 2925 * Let's play safe and flush the VCPU at startup. 2926 */ 2927 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 2928 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 2929 return; 2930 } 2931 2932 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 2933 { 2934 int i, online_vcpus, started_vcpus = 0; 2935 struct kvm_vcpu *started_vcpu = NULL; 2936 2937 if (is_vcpu_stopped(vcpu)) 2938 return; 2939 2940 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 2941 /* Only one cpu at a time may enter/leave the STOPPED state. */ 2942 spin_lock(&vcpu->kvm->arch.start_stop_lock); 2943 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 2944 2945 /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */ 2946 kvm_s390_clear_stop_irq(vcpu); 2947 2948 atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); 2949 __disable_ibs_on_vcpu(vcpu); 2950 2951 for (i = 0; i < online_vcpus; i++) { 2952 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) { 2953 started_vcpus++; 2954 started_vcpu = vcpu->kvm->vcpus[i]; 2955 } 2956 } 2957 2958 if (started_vcpus == 1) { 2959 /* 2960 * As we only have one VCPU left, we want to enable the 2961 * IBS facility for that VCPU to speed it up. 2962 */ 2963 __enable_ibs_on_vcpu(started_vcpu); 2964 } 2965 2966 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 2967 return; 2968 } 2969 2970 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 2971 struct kvm_enable_cap *cap) 2972 { 2973 int r; 2974 2975 if (cap->flags) 2976 return -EINVAL; 2977 2978 switch (cap->cap) { 2979 case KVM_CAP_S390_CSS_SUPPORT: 2980 if (!vcpu->kvm->arch.css_support) { 2981 vcpu->kvm->arch.css_support = 1; 2982 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 2983 trace_kvm_s390_enable_css(vcpu->kvm); 2984 } 2985 r = 0; 2986 break; 2987 default: 2988 r = -EINVAL; 2989 break; 2990 } 2991 return r; 2992 } 2993 2994 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu, 2995 struct kvm_s390_mem_op *mop) 2996 { 2997 void __user *uaddr = (void __user *)mop->buf; 2998 void *tmpbuf = NULL; 2999 int r, srcu_idx; 3000 const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION 3001 | KVM_S390_MEMOP_F_CHECK_ONLY; 3002 3003 if (mop->flags & ~supported_flags) 3004 return -EINVAL; 3005 3006 if (mop->size > MEM_OP_MAX_SIZE) 3007 return -E2BIG; 3008 3009 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 3010 tmpbuf = vmalloc(mop->size); 3011 if (!tmpbuf) 3012 return -ENOMEM; 3013 } 3014 3015 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 3016 3017 switch (mop->op) { 3018 case KVM_S390_MEMOP_LOGICAL_READ: 3019 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 3020 r = check_gva_range(vcpu, mop->gaddr, mop->ar, 3021 mop->size, GACC_FETCH); 3022 break; 3023 } 3024 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 3025 if (r == 0) { 3026 if (copy_to_user(uaddr, tmpbuf, mop->size)) 3027 r = -EFAULT; 3028 } 3029 break; 3030 case KVM_S390_MEMOP_LOGICAL_WRITE: 3031 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 3032 r = check_gva_range(vcpu, mop->gaddr, mop->ar, 3033 mop->size, GACC_STORE); 3034 break; 3035 } 3036 if (copy_from_user(tmpbuf, uaddr, mop->size)) { 3037 r = -EFAULT; 3038 break; 3039 } 3040 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 3041 break; 3042 default: 3043 r = -EINVAL; 3044 } 3045 3046 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 3047 3048 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 3049 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 3050 3051 vfree(tmpbuf); 3052 return r; 3053 } 3054 3055 long kvm_arch_vcpu_ioctl(struct file *filp, 3056 unsigned int ioctl, unsigned long arg) 3057 { 3058 struct kvm_vcpu *vcpu = filp->private_data; 3059 void __user *argp = (void __user *)arg; 3060 int idx; 3061 long r; 3062 3063 switch (ioctl) { 3064 case KVM_S390_IRQ: { 3065 struct kvm_s390_irq s390irq; 3066 3067 r = -EFAULT; 3068 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 3069 break; 3070 r = kvm_s390_inject_vcpu(vcpu, &s390irq); 3071 break; 3072 } 3073 case KVM_S390_INTERRUPT: { 3074 struct kvm_s390_interrupt s390int; 3075 struct kvm_s390_irq s390irq; 3076 3077 r = -EFAULT; 3078 if (copy_from_user(&s390int, argp, sizeof(s390int))) 3079 break; 3080 if (s390int_to_s390irq(&s390int, &s390irq)) 3081 return -EINVAL; 3082 r = kvm_s390_inject_vcpu(vcpu, &s390irq); 3083 break; 3084 } 3085 case KVM_S390_STORE_STATUS: 3086 idx = srcu_read_lock(&vcpu->kvm->srcu); 3087 r = kvm_s390_vcpu_store_status(vcpu, arg); 3088 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3089 break; 3090 case KVM_S390_SET_INITIAL_PSW: { 3091 psw_t psw; 3092 3093 r = -EFAULT; 3094 if (copy_from_user(&psw, argp, sizeof(psw))) 3095 break; 3096 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 3097 break; 3098 } 3099 case KVM_S390_INITIAL_RESET: 3100 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); 3101 break; 3102 case KVM_SET_ONE_REG: 3103 case KVM_GET_ONE_REG: { 3104 struct kvm_one_reg reg; 3105 r = -EFAULT; 3106 if (copy_from_user(®, argp, sizeof(reg))) 3107 break; 3108 if (ioctl == KVM_SET_ONE_REG) 3109 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 3110 else 3111 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 3112 break; 3113 } 3114 #ifdef CONFIG_KVM_S390_UCONTROL 3115 case KVM_S390_UCAS_MAP: { 3116 struct kvm_s390_ucas_mapping ucasmap; 3117 3118 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 3119 r = -EFAULT; 3120 break; 3121 } 3122 3123 if (!kvm_is_ucontrol(vcpu->kvm)) { 3124 r = -EINVAL; 3125 break; 3126 } 3127 3128 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, 3129 ucasmap.vcpu_addr, ucasmap.length); 3130 break; 3131 } 3132 case KVM_S390_UCAS_UNMAP: { 3133 struct kvm_s390_ucas_mapping ucasmap; 3134 3135 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 3136 r = -EFAULT; 3137 break; 3138 } 3139 3140 if (!kvm_is_ucontrol(vcpu->kvm)) { 3141 r = -EINVAL; 3142 break; 3143 } 3144 3145 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, 3146 ucasmap.length); 3147 break; 3148 } 3149 #endif 3150 case KVM_S390_VCPU_FAULT: { 3151 r = gmap_fault(vcpu->arch.gmap, arg, 0); 3152 break; 3153 } 3154 case KVM_ENABLE_CAP: 3155 { 3156 struct kvm_enable_cap cap; 3157 r = -EFAULT; 3158 if (copy_from_user(&cap, argp, sizeof(cap))) 3159 break; 3160 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 3161 break; 3162 } 3163 case KVM_S390_MEM_OP: { 3164 struct kvm_s390_mem_op mem_op; 3165 3166 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 3167 r = kvm_s390_guest_mem_op(vcpu, &mem_op); 3168 else 3169 r = -EFAULT; 3170 break; 3171 } 3172 case KVM_S390_SET_IRQ_STATE: { 3173 struct kvm_s390_irq_state irq_state; 3174 3175 r = -EFAULT; 3176 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 3177 break; 3178 if (irq_state.len > VCPU_IRQS_MAX_BUF || 3179 irq_state.len == 0 || 3180 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 3181 r = -EINVAL; 3182 break; 3183 } 3184 r = kvm_s390_set_irq_state(vcpu, 3185 (void __user *) irq_state.buf, 3186 irq_state.len); 3187 break; 3188 } 3189 case KVM_S390_GET_IRQ_STATE: { 3190 struct kvm_s390_irq_state irq_state; 3191 3192 r = -EFAULT; 3193 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 3194 break; 3195 if (irq_state.len == 0) { 3196 r = -EINVAL; 3197 break; 3198 } 3199 r = kvm_s390_get_irq_state(vcpu, 3200 (__u8 __user *) irq_state.buf, 3201 irq_state.len); 3202 break; 3203 } 3204 default: 3205 r = -ENOTTY; 3206 } 3207 return r; 3208 } 3209 3210 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 3211 { 3212 #ifdef CONFIG_KVM_S390_UCONTROL 3213 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 3214 && (kvm_is_ucontrol(vcpu->kvm))) { 3215 vmf->page = virt_to_page(vcpu->arch.sie_block); 3216 get_page(vmf->page); 3217 return 0; 3218 } 3219 #endif 3220 return VM_FAULT_SIGBUS; 3221 } 3222 3223 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 3224 unsigned long npages) 3225 { 3226 return 0; 3227 } 3228 3229 /* Section: memory related */ 3230 int kvm_arch_prepare_memory_region(struct kvm *kvm, 3231 struct kvm_memory_slot *memslot, 3232 const struct kvm_userspace_memory_region *mem, 3233 enum kvm_mr_change change) 3234 { 3235 /* A few sanity checks. We can have memory slots which have to be 3236 located/ended at a segment boundary (1MB). The memory in userland is 3237 ok to be fragmented into various different vmas. It is okay to mmap() 3238 and munmap() stuff in this slot after doing this call at any time */ 3239 3240 if (mem->userspace_addr & 0xffffful) 3241 return -EINVAL; 3242 3243 if (mem->memory_size & 0xffffful) 3244 return -EINVAL; 3245 3246 if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit) 3247 return -EINVAL; 3248 3249 return 0; 3250 } 3251 3252 void kvm_arch_commit_memory_region(struct kvm *kvm, 3253 const struct kvm_userspace_memory_region *mem, 3254 const struct kvm_memory_slot *old, 3255 const struct kvm_memory_slot *new, 3256 enum kvm_mr_change change) 3257 { 3258 int rc; 3259 3260 /* If the basics of the memslot do not change, we do not want 3261 * to update the gmap. Every update causes several unnecessary 3262 * segment translation exceptions. This is usually handled just 3263 * fine by the normal fault handler + gmap, but it will also 3264 * cause faults on the prefix page of running guest CPUs. 3265 */ 3266 if (old->userspace_addr == mem->userspace_addr && 3267 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr && 3268 old->npages * PAGE_SIZE == mem->memory_size) 3269 return; 3270 3271 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr, 3272 mem->guest_phys_addr, mem->memory_size); 3273 if (rc) 3274 pr_warn("failed to commit memory region\n"); 3275 return; 3276 } 3277 3278 static inline unsigned long nonhyp_mask(int i) 3279 { 3280 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; 3281 3282 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); 3283 } 3284 3285 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) 3286 { 3287 vcpu->valid_wakeup = false; 3288 } 3289 3290 static int __init kvm_s390_init(void) 3291 { 3292 int i; 3293 3294 if (!sclp.has_sief2) { 3295 pr_info("SIE not available\n"); 3296 return -ENODEV; 3297 } 3298 3299 for (i = 0; i < 16; i++) 3300 kvm_s390_fac_list_mask[i] |= 3301 S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i); 3302 3303 return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); 3304 } 3305 3306 static void __exit kvm_s390_exit(void) 3307 { 3308 kvm_exit(); 3309 } 3310 3311 module_init(kvm_s390_init); 3312 module_exit(kvm_s390_exit); 3313 3314 /* 3315 * Enable autoloading of the kvm module. 3316 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 3317 * since x86 takes a different approach. 3318 */ 3319 #include <linux/miscdevice.h> 3320 MODULE_ALIAS_MISCDEV(KVM_MINOR); 3321 MODULE_ALIAS("devname:kvm"); 3322