1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * hosting IBM Z kernel virtual machines (s390x) 4 * 5 * Copyright IBM Corp. 2008, 2018 6 * 7 * Author(s): Carsten Otte <cotte@de.ibm.com> 8 * Christian Borntraeger <borntraeger@de.ibm.com> 9 * Heiko Carstens <heiko.carstens@de.ibm.com> 10 * Christian Ehrhardt <ehrhardt@de.ibm.com> 11 * Jason J. Herne <jjherne@us.ibm.com> 12 */ 13 14 #define KMSG_COMPONENT "kvm-s390" 15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 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/moduleparam.h> 27 #include <linux/random.h> 28 #include <linux/slab.h> 29 #include <linux/timer.h> 30 #include <linux/vmalloc.h> 31 #include <linux/bitmap.h> 32 #include <linux/sched/signal.h> 33 #include <linux/string.h> 34 35 #include <asm/asm-offsets.h> 36 #include <asm/lowcore.h> 37 #include <asm/stp.h> 38 #include <asm/pgtable.h> 39 #include <asm/gmap.h> 40 #include <asm/nmi.h> 41 #include <asm/switch_to.h> 42 #include <asm/isc.h> 43 #include <asm/sclp.h> 44 #include <asm/cpacf.h> 45 #include <asm/timex.h> 46 #include <asm/ap.h> 47 #include "kvm-s390.h" 48 #include "gaccess.h" 49 50 #define CREATE_TRACE_POINTS 51 #include "trace.h" 52 #include "trace-s390.h" 53 54 #define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ 55 #define LOCAL_IRQS 32 56 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ 57 (KVM_MAX_VCPUS + LOCAL_IRQS)) 58 59 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU 60 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM 61 62 struct kvm_stats_debugfs_item debugfs_entries[] = { 63 { "userspace_handled", VCPU_STAT(exit_userspace) }, 64 { "exit_null", VCPU_STAT(exit_null) }, 65 { "exit_validity", VCPU_STAT(exit_validity) }, 66 { "exit_stop_request", VCPU_STAT(exit_stop_request) }, 67 { "exit_external_request", VCPU_STAT(exit_external_request) }, 68 { "exit_io_request", VCPU_STAT(exit_io_request) }, 69 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) }, 70 { "exit_instruction", VCPU_STAT(exit_instruction) }, 71 { "exit_pei", VCPU_STAT(exit_pei) }, 72 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) }, 73 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) }, 74 { "exit_operation_exception", VCPU_STAT(exit_operation_exception) }, 75 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, 76 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) }, 77 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) }, 78 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 79 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) }, 80 { "instruction_lctl", VCPU_STAT(instruction_lctl) }, 81 { "instruction_stctl", VCPU_STAT(instruction_stctl) }, 82 { "instruction_stctg", VCPU_STAT(instruction_stctg) }, 83 { "deliver_ckc", VCPU_STAT(deliver_ckc) }, 84 { "deliver_cputm", VCPU_STAT(deliver_cputm) }, 85 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) }, 86 { "deliver_external_call", VCPU_STAT(deliver_external_call) }, 87 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) }, 88 { "deliver_virtio", VCPU_STAT(deliver_virtio) }, 89 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) }, 90 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) }, 91 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) }, 92 { "deliver_program", VCPU_STAT(deliver_program) }, 93 { "deliver_io", VCPU_STAT(deliver_io) }, 94 { "deliver_machine_check", VCPU_STAT(deliver_machine_check) }, 95 { "exit_wait_state", VCPU_STAT(exit_wait_state) }, 96 { "inject_ckc", VCPU_STAT(inject_ckc) }, 97 { "inject_cputm", VCPU_STAT(inject_cputm) }, 98 { "inject_external_call", VCPU_STAT(inject_external_call) }, 99 { "inject_float_mchk", VM_STAT(inject_float_mchk) }, 100 { "inject_emergency_signal", VCPU_STAT(inject_emergency_signal) }, 101 { "inject_io", VM_STAT(inject_io) }, 102 { "inject_mchk", VCPU_STAT(inject_mchk) }, 103 { "inject_pfault_done", VM_STAT(inject_pfault_done) }, 104 { "inject_program", VCPU_STAT(inject_program) }, 105 { "inject_restart", VCPU_STAT(inject_restart) }, 106 { "inject_service_signal", VM_STAT(inject_service_signal) }, 107 { "inject_set_prefix", VCPU_STAT(inject_set_prefix) }, 108 { "inject_stop_signal", VCPU_STAT(inject_stop_signal) }, 109 { "inject_pfault_init", VCPU_STAT(inject_pfault_init) }, 110 { "inject_virtio", VM_STAT(inject_virtio) }, 111 { "instruction_epsw", VCPU_STAT(instruction_epsw) }, 112 { "instruction_gs", VCPU_STAT(instruction_gs) }, 113 { "instruction_io_other", VCPU_STAT(instruction_io_other) }, 114 { "instruction_lpsw", VCPU_STAT(instruction_lpsw) }, 115 { "instruction_lpswe", VCPU_STAT(instruction_lpswe) }, 116 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) }, 117 { "instruction_ptff", VCPU_STAT(instruction_ptff) }, 118 { "instruction_stidp", VCPU_STAT(instruction_stidp) }, 119 { "instruction_sck", VCPU_STAT(instruction_sck) }, 120 { "instruction_sckpf", VCPU_STAT(instruction_sckpf) }, 121 { "instruction_spx", VCPU_STAT(instruction_spx) }, 122 { "instruction_stpx", VCPU_STAT(instruction_stpx) }, 123 { "instruction_stap", VCPU_STAT(instruction_stap) }, 124 { "instruction_iske", VCPU_STAT(instruction_iske) }, 125 { "instruction_ri", VCPU_STAT(instruction_ri) }, 126 { "instruction_rrbe", VCPU_STAT(instruction_rrbe) }, 127 { "instruction_sske", VCPU_STAT(instruction_sske) }, 128 { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) }, 129 { "instruction_essa", VCPU_STAT(instruction_essa) }, 130 { "instruction_stsi", VCPU_STAT(instruction_stsi) }, 131 { "instruction_stfl", VCPU_STAT(instruction_stfl) }, 132 { "instruction_tb", VCPU_STAT(instruction_tb) }, 133 { "instruction_tpi", VCPU_STAT(instruction_tpi) }, 134 { "instruction_tprot", VCPU_STAT(instruction_tprot) }, 135 { "instruction_tsch", VCPU_STAT(instruction_tsch) }, 136 { "instruction_sthyi", VCPU_STAT(instruction_sthyi) }, 137 { "instruction_sie", VCPU_STAT(instruction_sie) }, 138 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) }, 139 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) }, 140 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) }, 141 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) }, 142 { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) }, 143 { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) }, 144 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) }, 145 { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) }, 146 { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) }, 147 { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) }, 148 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) }, 149 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) }, 150 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) }, 151 { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) }, 152 { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) }, 153 { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) }, 154 { "instruction_diag_10", VCPU_STAT(diagnose_10) }, 155 { "instruction_diag_44", VCPU_STAT(diagnose_44) }, 156 { "instruction_diag_9c", VCPU_STAT(diagnose_9c) }, 157 { "instruction_diag_258", VCPU_STAT(diagnose_258) }, 158 { "instruction_diag_308", VCPU_STAT(diagnose_308) }, 159 { "instruction_diag_500", VCPU_STAT(diagnose_500) }, 160 { "instruction_diag_other", VCPU_STAT(diagnose_other) }, 161 { NULL } 162 }; 163 164 struct kvm_s390_tod_clock_ext { 165 __u8 epoch_idx; 166 __u64 tod; 167 __u8 reserved[7]; 168 } __packed; 169 170 /* allow nested virtualization in KVM (if enabled by user space) */ 171 static int nested; 172 module_param(nested, int, S_IRUGO); 173 MODULE_PARM_DESC(nested, "Nested virtualization support"); 174 175 /* allow 1m huge page guest backing, if !nested */ 176 static int hpage; 177 module_param(hpage, int, 0444); 178 MODULE_PARM_DESC(hpage, "1m huge page backing support"); 179 180 /* 181 * For now we handle at most 16 double words as this is what the s390 base 182 * kernel handles and stores in the prefix page. If we ever need to go beyond 183 * this, this requires changes to code, but the external uapi can stay. 184 */ 185 #define SIZE_INTERNAL 16 186 187 /* 188 * Base feature mask that defines default mask for facilities. Consists of the 189 * defines in FACILITIES_KVM and the non-hypervisor managed bits. 190 */ 191 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM }; 192 /* 193 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL 194 * and defines the facilities that can be enabled via a cpu model. 195 */ 196 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL }; 197 198 static unsigned long kvm_s390_fac_size(void) 199 { 200 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64); 201 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64); 202 BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) > 203 sizeof(S390_lowcore.stfle_fac_list)); 204 205 return SIZE_INTERNAL; 206 } 207 208 /* available cpu features supported by kvm */ 209 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 210 /* available subfunctions indicated via query / "test bit" */ 211 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; 212 213 static struct gmap_notifier gmap_notifier; 214 static struct gmap_notifier vsie_gmap_notifier; 215 debug_info_t *kvm_s390_dbf; 216 217 /* Section: not file related */ 218 int kvm_arch_hardware_enable(void) 219 { 220 /* every s390 is virtualization enabled ;-) */ 221 return 0; 222 } 223 224 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 225 unsigned long end); 226 227 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta) 228 { 229 u8 delta_idx = 0; 230 231 /* 232 * The TOD jumps by delta, we have to compensate this by adding 233 * -delta to the epoch. 234 */ 235 delta = -delta; 236 237 /* sign-extension - we're adding to signed values below */ 238 if ((s64)delta < 0) 239 delta_idx = -1; 240 241 scb->epoch += delta; 242 if (scb->ecd & ECD_MEF) { 243 scb->epdx += delta_idx; 244 if (scb->epoch < delta) 245 scb->epdx += 1; 246 } 247 } 248 249 /* 250 * This callback is executed during stop_machine(). All CPUs are therefore 251 * temporarily stopped. In order not to change guest behavior, we have to 252 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 253 * so a CPU won't be stopped while calculating with the epoch. 254 */ 255 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 256 void *v) 257 { 258 struct kvm *kvm; 259 struct kvm_vcpu *vcpu; 260 int i; 261 unsigned long long *delta = v; 262 263 list_for_each_entry(kvm, &vm_list, vm_list) { 264 kvm_for_each_vcpu(i, vcpu, kvm) { 265 kvm_clock_sync_scb(vcpu->arch.sie_block, *delta); 266 if (i == 0) { 267 kvm->arch.epoch = vcpu->arch.sie_block->epoch; 268 kvm->arch.epdx = vcpu->arch.sie_block->epdx; 269 } 270 if (vcpu->arch.cputm_enabled) 271 vcpu->arch.cputm_start += *delta; 272 if (vcpu->arch.vsie_block) 273 kvm_clock_sync_scb(vcpu->arch.vsie_block, 274 *delta); 275 } 276 } 277 return NOTIFY_OK; 278 } 279 280 static struct notifier_block kvm_clock_notifier = { 281 .notifier_call = kvm_clock_sync, 282 }; 283 284 int kvm_arch_hardware_setup(void) 285 { 286 gmap_notifier.notifier_call = kvm_gmap_notifier; 287 gmap_register_pte_notifier(&gmap_notifier); 288 vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier; 289 gmap_register_pte_notifier(&vsie_gmap_notifier); 290 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 291 &kvm_clock_notifier); 292 return 0; 293 } 294 295 void kvm_arch_hardware_unsetup(void) 296 { 297 gmap_unregister_pte_notifier(&gmap_notifier); 298 gmap_unregister_pte_notifier(&vsie_gmap_notifier); 299 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 300 &kvm_clock_notifier); 301 } 302 303 static void allow_cpu_feat(unsigned long nr) 304 { 305 set_bit_inv(nr, kvm_s390_available_cpu_feat); 306 } 307 308 static inline int plo_test_bit(unsigned char nr) 309 { 310 register unsigned long r0 asm("0") = (unsigned long) nr | 0x100; 311 int cc; 312 313 asm volatile( 314 /* Parameter registers are ignored for "test bit" */ 315 " plo 0,0,0,0(0)\n" 316 " ipm %0\n" 317 " srl %0,28\n" 318 : "=d" (cc) 319 : "d" (r0) 320 : "cc"); 321 return cc == 0; 322 } 323 324 static void kvm_s390_cpu_feat_init(void) 325 { 326 int i; 327 328 for (i = 0; i < 256; ++i) { 329 if (plo_test_bit(i)) 330 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); 331 } 332 333 if (test_facility(28)) /* TOD-clock steering */ 334 ptff(kvm_s390_available_subfunc.ptff, 335 sizeof(kvm_s390_available_subfunc.ptff), 336 PTFF_QAF); 337 338 if (test_facility(17)) { /* MSA */ 339 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *) 340 kvm_s390_available_subfunc.kmac); 341 __cpacf_query(CPACF_KMC, (cpacf_mask_t *) 342 kvm_s390_available_subfunc.kmc); 343 __cpacf_query(CPACF_KM, (cpacf_mask_t *) 344 kvm_s390_available_subfunc.km); 345 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *) 346 kvm_s390_available_subfunc.kimd); 347 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *) 348 kvm_s390_available_subfunc.klmd); 349 } 350 if (test_facility(76)) /* MSA3 */ 351 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *) 352 kvm_s390_available_subfunc.pckmo); 353 if (test_facility(77)) { /* MSA4 */ 354 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *) 355 kvm_s390_available_subfunc.kmctr); 356 __cpacf_query(CPACF_KMF, (cpacf_mask_t *) 357 kvm_s390_available_subfunc.kmf); 358 __cpacf_query(CPACF_KMO, (cpacf_mask_t *) 359 kvm_s390_available_subfunc.kmo); 360 __cpacf_query(CPACF_PCC, (cpacf_mask_t *) 361 kvm_s390_available_subfunc.pcc); 362 } 363 if (test_facility(57)) /* MSA5 */ 364 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *) 365 kvm_s390_available_subfunc.ppno); 366 367 if (test_facility(146)) /* MSA8 */ 368 __cpacf_query(CPACF_KMA, (cpacf_mask_t *) 369 kvm_s390_available_subfunc.kma); 370 371 if (MACHINE_HAS_ESOP) 372 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); 373 /* 374 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), 375 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). 376 */ 377 if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao || 378 !test_facility(3) || !nested) 379 return; 380 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); 381 if (sclp.has_64bscao) 382 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); 383 if (sclp.has_siif) 384 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); 385 if (sclp.has_gpere) 386 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); 387 if (sclp.has_gsls) 388 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); 389 if (sclp.has_ib) 390 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); 391 if (sclp.has_cei) 392 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); 393 if (sclp.has_ibs) 394 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); 395 if (sclp.has_kss) 396 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS); 397 /* 398 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make 399 * all skey handling functions read/set the skey from the PGSTE 400 * instead of the real storage key. 401 * 402 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make 403 * pages being detected as preserved although they are resident. 404 * 405 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will 406 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. 407 * 408 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and 409 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be 410 * correctly shadowed. We can do that for the PGSTE but not for PTE.I. 411 * 412 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We 413 * cannot easily shadow the SCA because of the ipte lock. 414 */ 415 } 416 417 int kvm_arch_init(void *opaque) 418 { 419 int rc; 420 421 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 422 if (!kvm_s390_dbf) 423 return -ENOMEM; 424 425 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) { 426 rc = -ENOMEM; 427 goto out_debug_unreg; 428 } 429 430 kvm_s390_cpu_feat_init(); 431 432 /* Register floating interrupt controller interface. */ 433 rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 434 if (rc) { 435 pr_err("A FLIC registration call failed with rc=%d\n", rc); 436 goto out_debug_unreg; 437 } 438 439 rc = kvm_s390_gib_init(GAL_ISC); 440 if (rc) 441 goto out_gib_destroy; 442 443 return 0; 444 445 out_gib_destroy: 446 kvm_s390_gib_destroy(); 447 out_debug_unreg: 448 debug_unregister(kvm_s390_dbf); 449 return rc; 450 } 451 452 void kvm_arch_exit(void) 453 { 454 kvm_s390_gib_destroy(); 455 debug_unregister(kvm_s390_dbf); 456 } 457 458 /* Section: device related */ 459 long kvm_arch_dev_ioctl(struct file *filp, 460 unsigned int ioctl, unsigned long arg) 461 { 462 if (ioctl == KVM_S390_ENABLE_SIE) 463 return s390_enable_sie(); 464 return -EINVAL; 465 } 466 467 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 468 { 469 int r; 470 471 switch (ext) { 472 case KVM_CAP_S390_PSW: 473 case KVM_CAP_S390_GMAP: 474 case KVM_CAP_SYNC_MMU: 475 #ifdef CONFIG_KVM_S390_UCONTROL 476 case KVM_CAP_S390_UCONTROL: 477 #endif 478 case KVM_CAP_ASYNC_PF: 479 case KVM_CAP_SYNC_REGS: 480 case KVM_CAP_ONE_REG: 481 case KVM_CAP_ENABLE_CAP: 482 case KVM_CAP_S390_CSS_SUPPORT: 483 case KVM_CAP_IOEVENTFD: 484 case KVM_CAP_DEVICE_CTRL: 485 case KVM_CAP_S390_IRQCHIP: 486 case KVM_CAP_VM_ATTRIBUTES: 487 case KVM_CAP_MP_STATE: 488 case KVM_CAP_IMMEDIATE_EXIT: 489 case KVM_CAP_S390_INJECT_IRQ: 490 case KVM_CAP_S390_USER_SIGP: 491 case KVM_CAP_S390_USER_STSI: 492 case KVM_CAP_S390_SKEYS: 493 case KVM_CAP_S390_IRQ_STATE: 494 case KVM_CAP_S390_USER_INSTR0: 495 case KVM_CAP_S390_CMMA_MIGRATION: 496 case KVM_CAP_S390_AIS: 497 case KVM_CAP_S390_AIS_MIGRATION: 498 r = 1; 499 break; 500 case KVM_CAP_S390_HPAGE_1M: 501 r = 0; 502 if (hpage && !kvm_is_ucontrol(kvm)) 503 r = 1; 504 break; 505 case KVM_CAP_S390_MEM_OP: 506 r = MEM_OP_MAX_SIZE; 507 break; 508 case KVM_CAP_NR_VCPUS: 509 case KVM_CAP_MAX_VCPUS: 510 r = KVM_S390_BSCA_CPU_SLOTS; 511 if (!kvm_s390_use_sca_entries()) 512 r = KVM_MAX_VCPUS; 513 else if (sclp.has_esca && sclp.has_64bscao) 514 r = KVM_S390_ESCA_CPU_SLOTS; 515 break; 516 case KVM_CAP_NR_MEMSLOTS: 517 r = KVM_USER_MEM_SLOTS; 518 break; 519 case KVM_CAP_S390_COW: 520 r = MACHINE_HAS_ESOP; 521 break; 522 case KVM_CAP_S390_VECTOR_REGISTERS: 523 r = MACHINE_HAS_VX; 524 break; 525 case KVM_CAP_S390_RI: 526 r = test_facility(64); 527 break; 528 case KVM_CAP_S390_GS: 529 r = test_facility(133); 530 break; 531 case KVM_CAP_S390_BPB: 532 r = test_facility(82); 533 break; 534 default: 535 r = 0; 536 } 537 return r; 538 } 539 540 static void kvm_s390_sync_dirty_log(struct kvm *kvm, 541 struct kvm_memory_slot *memslot) 542 { 543 int i; 544 gfn_t cur_gfn, last_gfn; 545 unsigned long gaddr, vmaddr; 546 struct gmap *gmap = kvm->arch.gmap; 547 DECLARE_BITMAP(bitmap, _PAGE_ENTRIES); 548 549 /* Loop over all guest segments */ 550 cur_gfn = memslot->base_gfn; 551 last_gfn = memslot->base_gfn + memslot->npages; 552 for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) { 553 gaddr = gfn_to_gpa(cur_gfn); 554 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn); 555 if (kvm_is_error_hva(vmaddr)) 556 continue; 557 558 bitmap_zero(bitmap, _PAGE_ENTRIES); 559 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr); 560 for (i = 0; i < _PAGE_ENTRIES; i++) { 561 if (test_bit(i, bitmap)) 562 mark_page_dirty(kvm, cur_gfn + i); 563 } 564 565 if (fatal_signal_pending(current)) 566 return; 567 cond_resched(); 568 } 569 } 570 571 /* Section: vm related */ 572 static void sca_del_vcpu(struct kvm_vcpu *vcpu); 573 574 /* 575 * Get (and clear) the dirty memory log for a memory slot. 576 */ 577 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 578 struct kvm_dirty_log *log) 579 { 580 int r; 581 unsigned long n; 582 struct kvm_memslots *slots; 583 struct kvm_memory_slot *memslot; 584 int is_dirty = 0; 585 586 if (kvm_is_ucontrol(kvm)) 587 return -EINVAL; 588 589 mutex_lock(&kvm->slots_lock); 590 591 r = -EINVAL; 592 if (log->slot >= KVM_USER_MEM_SLOTS) 593 goto out; 594 595 slots = kvm_memslots(kvm); 596 memslot = id_to_memslot(slots, log->slot); 597 r = -ENOENT; 598 if (!memslot->dirty_bitmap) 599 goto out; 600 601 kvm_s390_sync_dirty_log(kvm, memslot); 602 r = kvm_get_dirty_log(kvm, log, &is_dirty); 603 if (r) 604 goto out; 605 606 /* Clear the dirty log */ 607 if (is_dirty) { 608 n = kvm_dirty_bitmap_bytes(memslot); 609 memset(memslot->dirty_bitmap, 0, n); 610 } 611 r = 0; 612 out: 613 mutex_unlock(&kvm->slots_lock); 614 return r; 615 } 616 617 static void icpt_operexc_on_all_vcpus(struct kvm *kvm) 618 { 619 unsigned int i; 620 struct kvm_vcpu *vcpu; 621 622 kvm_for_each_vcpu(i, vcpu, kvm) { 623 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); 624 } 625 } 626 627 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 628 { 629 int r; 630 631 if (cap->flags) 632 return -EINVAL; 633 634 switch (cap->cap) { 635 case KVM_CAP_S390_IRQCHIP: 636 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 637 kvm->arch.use_irqchip = 1; 638 r = 0; 639 break; 640 case KVM_CAP_S390_USER_SIGP: 641 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 642 kvm->arch.user_sigp = 1; 643 r = 0; 644 break; 645 case KVM_CAP_S390_VECTOR_REGISTERS: 646 mutex_lock(&kvm->lock); 647 if (kvm->created_vcpus) { 648 r = -EBUSY; 649 } else if (MACHINE_HAS_VX) { 650 set_kvm_facility(kvm->arch.model.fac_mask, 129); 651 set_kvm_facility(kvm->arch.model.fac_list, 129); 652 if (test_facility(134)) { 653 set_kvm_facility(kvm->arch.model.fac_mask, 134); 654 set_kvm_facility(kvm->arch.model.fac_list, 134); 655 } 656 if (test_facility(135)) { 657 set_kvm_facility(kvm->arch.model.fac_mask, 135); 658 set_kvm_facility(kvm->arch.model.fac_list, 135); 659 } 660 r = 0; 661 } else 662 r = -EINVAL; 663 mutex_unlock(&kvm->lock); 664 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 665 r ? "(not available)" : "(success)"); 666 break; 667 case KVM_CAP_S390_RI: 668 r = -EINVAL; 669 mutex_lock(&kvm->lock); 670 if (kvm->created_vcpus) { 671 r = -EBUSY; 672 } else if (test_facility(64)) { 673 set_kvm_facility(kvm->arch.model.fac_mask, 64); 674 set_kvm_facility(kvm->arch.model.fac_list, 64); 675 r = 0; 676 } 677 mutex_unlock(&kvm->lock); 678 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", 679 r ? "(not available)" : "(success)"); 680 break; 681 case KVM_CAP_S390_AIS: 682 mutex_lock(&kvm->lock); 683 if (kvm->created_vcpus) { 684 r = -EBUSY; 685 } else { 686 set_kvm_facility(kvm->arch.model.fac_mask, 72); 687 set_kvm_facility(kvm->arch.model.fac_list, 72); 688 r = 0; 689 } 690 mutex_unlock(&kvm->lock); 691 VM_EVENT(kvm, 3, "ENABLE: AIS %s", 692 r ? "(not available)" : "(success)"); 693 break; 694 case KVM_CAP_S390_GS: 695 r = -EINVAL; 696 mutex_lock(&kvm->lock); 697 if (kvm->created_vcpus) { 698 r = -EBUSY; 699 } else if (test_facility(133)) { 700 set_kvm_facility(kvm->arch.model.fac_mask, 133); 701 set_kvm_facility(kvm->arch.model.fac_list, 133); 702 r = 0; 703 } 704 mutex_unlock(&kvm->lock); 705 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s", 706 r ? "(not available)" : "(success)"); 707 break; 708 case KVM_CAP_S390_HPAGE_1M: 709 mutex_lock(&kvm->lock); 710 if (kvm->created_vcpus) 711 r = -EBUSY; 712 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) 713 r = -EINVAL; 714 else { 715 r = 0; 716 down_write(&kvm->mm->mmap_sem); 717 kvm->mm->context.allow_gmap_hpage_1m = 1; 718 up_write(&kvm->mm->mmap_sem); 719 /* 720 * We might have to create fake 4k page 721 * tables. To avoid that the hardware works on 722 * stale PGSTEs, we emulate these instructions. 723 */ 724 kvm->arch.use_skf = 0; 725 kvm->arch.use_pfmfi = 0; 726 } 727 mutex_unlock(&kvm->lock); 728 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s", 729 r ? "(not available)" : "(success)"); 730 break; 731 case KVM_CAP_S390_USER_STSI: 732 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 733 kvm->arch.user_stsi = 1; 734 r = 0; 735 break; 736 case KVM_CAP_S390_USER_INSTR0: 737 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); 738 kvm->arch.user_instr0 = 1; 739 icpt_operexc_on_all_vcpus(kvm); 740 r = 0; 741 break; 742 default: 743 r = -EINVAL; 744 break; 745 } 746 return r; 747 } 748 749 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 750 { 751 int ret; 752 753 switch (attr->attr) { 754 case KVM_S390_VM_MEM_LIMIT_SIZE: 755 ret = 0; 756 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 757 kvm->arch.mem_limit); 758 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) 759 ret = -EFAULT; 760 break; 761 default: 762 ret = -ENXIO; 763 break; 764 } 765 return ret; 766 } 767 768 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 769 { 770 int ret; 771 unsigned int idx; 772 switch (attr->attr) { 773 case KVM_S390_VM_MEM_ENABLE_CMMA: 774 ret = -ENXIO; 775 if (!sclp.has_cmma) 776 break; 777 778 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 779 mutex_lock(&kvm->lock); 780 if (kvm->created_vcpus) 781 ret = -EBUSY; 782 else if (kvm->mm->context.allow_gmap_hpage_1m) 783 ret = -EINVAL; 784 else { 785 kvm->arch.use_cmma = 1; 786 /* Not compatible with cmma. */ 787 kvm->arch.use_pfmfi = 0; 788 ret = 0; 789 } 790 mutex_unlock(&kvm->lock); 791 break; 792 case KVM_S390_VM_MEM_CLR_CMMA: 793 ret = -ENXIO; 794 if (!sclp.has_cmma) 795 break; 796 ret = -EINVAL; 797 if (!kvm->arch.use_cmma) 798 break; 799 800 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 801 mutex_lock(&kvm->lock); 802 idx = srcu_read_lock(&kvm->srcu); 803 s390_reset_cmma(kvm->arch.gmap->mm); 804 srcu_read_unlock(&kvm->srcu, idx); 805 mutex_unlock(&kvm->lock); 806 ret = 0; 807 break; 808 case KVM_S390_VM_MEM_LIMIT_SIZE: { 809 unsigned long new_limit; 810 811 if (kvm_is_ucontrol(kvm)) 812 return -EINVAL; 813 814 if (get_user(new_limit, (u64 __user *)attr->addr)) 815 return -EFAULT; 816 817 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && 818 new_limit > kvm->arch.mem_limit) 819 return -E2BIG; 820 821 if (!new_limit) 822 return -EINVAL; 823 824 /* gmap_create takes last usable address */ 825 if (new_limit != KVM_S390_NO_MEM_LIMIT) 826 new_limit -= 1; 827 828 ret = -EBUSY; 829 mutex_lock(&kvm->lock); 830 if (!kvm->created_vcpus) { 831 /* gmap_create will round the limit up */ 832 struct gmap *new = gmap_create(current->mm, new_limit); 833 834 if (!new) { 835 ret = -ENOMEM; 836 } else { 837 gmap_remove(kvm->arch.gmap); 838 new->private = kvm; 839 kvm->arch.gmap = new; 840 ret = 0; 841 } 842 } 843 mutex_unlock(&kvm->lock); 844 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); 845 VM_EVENT(kvm, 3, "New guest asce: 0x%pK", 846 (void *) kvm->arch.gmap->asce); 847 break; 848 } 849 default: 850 ret = -ENXIO; 851 break; 852 } 853 return ret; 854 } 855 856 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 857 858 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) 859 { 860 struct kvm_vcpu *vcpu; 861 int i; 862 863 kvm_s390_vcpu_block_all(kvm); 864 865 kvm_for_each_vcpu(i, vcpu, kvm) { 866 kvm_s390_vcpu_crypto_setup(vcpu); 867 /* recreate the shadow crycb by leaving the VSIE handler */ 868 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 869 } 870 871 kvm_s390_vcpu_unblock_all(kvm); 872 } 873 874 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 875 { 876 mutex_lock(&kvm->lock); 877 switch (attr->attr) { 878 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 879 if (!test_kvm_facility(kvm, 76)) { 880 mutex_unlock(&kvm->lock); 881 return -EINVAL; 882 } 883 get_random_bytes( 884 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 885 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 886 kvm->arch.crypto.aes_kw = 1; 887 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 888 break; 889 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 890 if (!test_kvm_facility(kvm, 76)) { 891 mutex_unlock(&kvm->lock); 892 return -EINVAL; 893 } 894 get_random_bytes( 895 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 896 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 897 kvm->arch.crypto.dea_kw = 1; 898 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 899 break; 900 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 901 if (!test_kvm_facility(kvm, 76)) { 902 mutex_unlock(&kvm->lock); 903 return -EINVAL; 904 } 905 kvm->arch.crypto.aes_kw = 0; 906 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 907 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 908 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 909 break; 910 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 911 if (!test_kvm_facility(kvm, 76)) { 912 mutex_unlock(&kvm->lock); 913 return -EINVAL; 914 } 915 kvm->arch.crypto.dea_kw = 0; 916 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 917 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 918 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 919 break; 920 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 921 if (!ap_instructions_available()) { 922 mutex_unlock(&kvm->lock); 923 return -EOPNOTSUPP; 924 } 925 kvm->arch.crypto.apie = 1; 926 break; 927 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 928 if (!ap_instructions_available()) { 929 mutex_unlock(&kvm->lock); 930 return -EOPNOTSUPP; 931 } 932 kvm->arch.crypto.apie = 0; 933 break; 934 default: 935 mutex_unlock(&kvm->lock); 936 return -ENXIO; 937 } 938 939 kvm_s390_vcpu_crypto_reset_all(kvm); 940 mutex_unlock(&kvm->lock); 941 return 0; 942 } 943 944 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) 945 { 946 int cx; 947 struct kvm_vcpu *vcpu; 948 949 kvm_for_each_vcpu(cx, vcpu, kvm) 950 kvm_s390_sync_request(req, vcpu); 951 } 952 953 /* 954 * Must be called with kvm->srcu held to avoid races on memslots, and with 955 * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration. 956 */ 957 static int kvm_s390_vm_start_migration(struct kvm *kvm) 958 { 959 struct kvm_memory_slot *ms; 960 struct kvm_memslots *slots; 961 unsigned long ram_pages = 0; 962 int slotnr; 963 964 /* migration mode already enabled */ 965 if (kvm->arch.migration_mode) 966 return 0; 967 slots = kvm_memslots(kvm); 968 if (!slots || !slots->used_slots) 969 return -EINVAL; 970 971 if (!kvm->arch.use_cmma) { 972 kvm->arch.migration_mode = 1; 973 return 0; 974 } 975 /* mark all the pages in active slots as dirty */ 976 for (slotnr = 0; slotnr < slots->used_slots; slotnr++) { 977 ms = slots->memslots + slotnr; 978 /* 979 * The second half of the bitmap is only used on x86, 980 * and would be wasted otherwise, so we put it to good 981 * use here to keep track of the state of the storage 982 * attributes. 983 */ 984 memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms)); 985 ram_pages += ms->npages; 986 } 987 atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages); 988 kvm->arch.migration_mode = 1; 989 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION); 990 return 0; 991 } 992 993 /* 994 * Must be called with kvm->slots_lock to avoid races with ourselves and 995 * kvm_s390_vm_start_migration. 996 */ 997 static int kvm_s390_vm_stop_migration(struct kvm *kvm) 998 { 999 /* migration mode already disabled */ 1000 if (!kvm->arch.migration_mode) 1001 return 0; 1002 kvm->arch.migration_mode = 0; 1003 if (kvm->arch.use_cmma) 1004 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION); 1005 return 0; 1006 } 1007 1008 static int kvm_s390_vm_set_migration(struct kvm *kvm, 1009 struct kvm_device_attr *attr) 1010 { 1011 int res = -ENXIO; 1012 1013 mutex_lock(&kvm->slots_lock); 1014 switch (attr->attr) { 1015 case KVM_S390_VM_MIGRATION_START: 1016 res = kvm_s390_vm_start_migration(kvm); 1017 break; 1018 case KVM_S390_VM_MIGRATION_STOP: 1019 res = kvm_s390_vm_stop_migration(kvm); 1020 break; 1021 default: 1022 break; 1023 } 1024 mutex_unlock(&kvm->slots_lock); 1025 1026 return res; 1027 } 1028 1029 static int kvm_s390_vm_get_migration(struct kvm *kvm, 1030 struct kvm_device_attr *attr) 1031 { 1032 u64 mig = kvm->arch.migration_mode; 1033 1034 if (attr->attr != KVM_S390_VM_MIGRATION_STATUS) 1035 return -ENXIO; 1036 1037 if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig))) 1038 return -EFAULT; 1039 return 0; 1040 } 1041 1042 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1043 { 1044 struct kvm_s390_vm_tod_clock gtod; 1045 1046 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 1047 return -EFAULT; 1048 1049 if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) 1050 return -EINVAL; 1051 kvm_s390_set_tod_clock(kvm, >od); 1052 1053 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", 1054 gtod.epoch_idx, gtod.tod); 1055 1056 return 0; 1057 } 1058 1059 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1060 { 1061 u8 gtod_high; 1062 1063 if (copy_from_user(>od_high, (void __user *)attr->addr, 1064 sizeof(gtod_high))) 1065 return -EFAULT; 1066 1067 if (gtod_high != 0) 1068 return -EINVAL; 1069 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 1070 1071 return 0; 1072 } 1073 1074 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1075 { 1076 struct kvm_s390_vm_tod_clock gtod = { 0 }; 1077 1078 if (copy_from_user(>od.tod, (void __user *)attr->addr, 1079 sizeof(gtod.tod))) 1080 return -EFAULT; 1081 1082 kvm_s390_set_tod_clock(kvm, >od); 1083 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); 1084 return 0; 1085 } 1086 1087 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1088 { 1089 int ret; 1090 1091 if (attr->flags) 1092 return -EINVAL; 1093 1094 switch (attr->attr) { 1095 case KVM_S390_VM_TOD_EXT: 1096 ret = kvm_s390_set_tod_ext(kvm, attr); 1097 break; 1098 case KVM_S390_VM_TOD_HIGH: 1099 ret = kvm_s390_set_tod_high(kvm, attr); 1100 break; 1101 case KVM_S390_VM_TOD_LOW: 1102 ret = kvm_s390_set_tod_low(kvm, attr); 1103 break; 1104 default: 1105 ret = -ENXIO; 1106 break; 1107 } 1108 return ret; 1109 } 1110 1111 static void kvm_s390_get_tod_clock(struct kvm *kvm, 1112 struct kvm_s390_vm_tod_clock *gtod) 1113 { 1114 struct kvm_s390_tod_clock_ext htod; 1115 1116 preempt_disable(); 1117 1118 get_tod_clock_ext((char *)&htod); 1119 1120 gtod->tod = htod.tod + kvm->arch.epoch; 1121 gtod->epoch_idx = 0; 1122 if (test_kvm_facility(kvm, 139)) { 1123 gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx; 1124 if (gtod->tod < htod.tod) 1125 gtod->epoch_idx += 1; 1126 } 1127 1128 preempt_enable(); 1129 } 1130 1131 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1132 { 1133 struct kvm_s390_vm_tod_clock gtod; 1134 1135 memset(>od, 0, sizeof(gtod)); 1136 kvm_s390_get_tod_clock(kvm, >od); 1137 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1138 return -EFAULT; 1139 1140 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx", 1141 gtod.epoch_idx, gtod.tod); 1142 return 0; 1143 } 1144 1145 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1146 { 1147 u8 gtod_high = 0; 1148 1149 if (copy_to_user((void __user *)attr->addr, >od_high, 1150 sizeof(gtod_high))) 1151 return -EFAULT; 1152 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 1153 1154 return 0; 1155 } 1156 1157 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1158 { 1159 u64 gtod; 1160 1161 gtod = kvm_s390_get_tod_clock_fast(kvm); 1162 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1163 return -EFAULT; 1164 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 1165 1166 return 0; 1167 } 1168 1169 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1170 { 1171 int ret; 1172 1173 if (attr->flags) 1174 return -EINVAL; 1175 1176 switch (attr->attr) { 1177 case KVM_S390_VM_TOD_EXT: 1178 ret = kvm_s390_get_tod_ext(kvm, attr); 1179 break; 1180 case KVM_S390_VM_TOD_HIGH: 1181 ret = kvm_s390_get_tod_high(kvm, attr); 1182 break; 1183 case KVM_S390_VM_TOD_LOW: 1184 ret = kvm_s390_get_tod_low(kvm, attr); 1185 break; 1186 default: 1187 ret = -ENXIO; 1188 break; 1189 } 1190 return ret; 1191 } 1192 1193 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1194 { 1195 struct kvm_s390_vm_cpu_processor *proc; 1196 u16 lowest_ibc, unblocked_ibc; 1197 int ret = 0; 1198 1199 mutex_lock(&kvm->lock); 1200 if (kvm->created_vcpus) { 1201 ret = -EBUSY; 1202 goto out; 1203 } 1204 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 1205 if (!proc) { 1206 ret = -ENOMEM; 1207 goto out; 1208 } 1209 if (!copy_from_user(proc, (void __user *)attr->addr, 1210 sizeof(*proc))) { 1211 kvm->arch.model.cpuid = proc->cpuid; 1212 lowest_ibc = sclp.ibc >> 16 & 0xfff; 1213 unblocked_ibc = sclp.ibc & 0xfff; 1214 if (lowest_ibc && proc->ibc) { 1215 if (proc->ibc > unblocked_ibc) 1216 kvm->arch.model.ibc = unblocked_ibc; 1217 else if (proc->ibc < lowest_ibc) 1218 kvm->arch.model.ibc = lowest_ibc; 1219 else 1220 kvm->arch.model.ibc = proc->ibc; 1221 } 1222 memcpy(kvm->arch.model.fac_list, proc->fac_list, 1223 S390_ARCH_FAC_LIST_SIZE_BYTE); 1224 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1225 kvm->arch.model.ibc, 1226 kvm->arch.model.cpuid); 1227 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1228 kvm->arch.model.fac_list[0], 1229 kvm->arch.model.fac_list[1], 1230 kvm->arch.model.fac_list[2]); 1231 } else 1232 ret = -EFAULT; 1233 kfree(proc); 1234 out: 1235 mutex_unlock(&kvm->lock); 1236 return ret; 1237 } 1238 1239 static int kvm_s390_set_processor_feat(struct kvm *kvm, 1240 struct kvm_device_attr *attr) 1241 { 1242 struct kvm_s390_vm_cpu_feat data; 1243 1244 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) 1245 return -EFAULT; 1246 if (!bitmap_subset((unsigned long *) data.feat, 1247 kvm_s390_available_cpu_feat, 1248 KVM_S390_VM_CPU_FEAT_NR_BITS)) 1249 return -EINVAL; 1250 1251 mutex_lock(&kvm->lock); 1252 if (kvm->created_vcpus) { 1253 mutex_unlock(&kvm->lock); 1254 return -EBUSY; 1255 } 1256 bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat, 1257 KVM_S390_VM_CPU_FEAT_NR_BITS); 1258 mutex_unlock(&kvm->lock); 1259 VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1260 data.feat[0], 1261 data.feat[1], 1262 data.feat[2]); 1263 return 0; 1264 } 1265 1266 static int kvm_s390_set_processor_subfunc(struct kvm *kvm, 1267 struct kvm_device_attr *attr) 1268 { 1269 mutex_lock(&kvm->lock); 1270 if (kvm->created_vcpus) { 1271 mutex_unlock(&kvm->lock); 1272 return -EBUSY; 1273 } 1274 1275 if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr, 1276 sizeof(struct kvm_s390_vm_cpu_subfunc))) { 1277 mutex_unlock(&kvm->lock); 1278 return -EFAULT; 1279 } 1280 mutex_unlock(&kvm->lock); 1281 1282 VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1283 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1284 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1285 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1286 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1287 VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1288 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1289 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1290 VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1291 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1292 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1293 VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1294 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1295 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1296 VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx", 1297 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1298 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1299 VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1300 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1301 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1302 VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1303 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1304 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1305 VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1306 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1307 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1308 VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1309 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1310 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1311 VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1312 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1313 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1314 VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1315 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1316 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1317 VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1318 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1319 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1320 VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1321 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1322 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1323 VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1324 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1325 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1326 1327 return 0; 1328 } 1329 1330 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1331 { 1332 int ret = -ENXIO; 1333 1334 switch (attr->attr) { 1335 case KVM_S390_VM_CPU_PROCESSOR: 1336 ret = kvm_s390_set_processor(kvm, attr); 1337 break; 1338 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1339 ret = kvm_s390_set_processor_feat(kvm, attr); 1340 break; 1341 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1342 ret = kvm_s390_set_processor_subfunc(kvm, attr); 1343 break; 1344 } 1345 return ret; 1346 } 1347 1348 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1349 { 1350 struct kvm_s390_vm_cpu_processor *proc; 1351 int ret = 0; 1352 1353 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 1354 if (!proc) { 1355 ret = -ENOMEM; 1356 goto out; 1357 } 1358 proc->cpuid = kvm->arch.model.cpuid; 1359 proc->ibc = kvm->arch.model.ibc; 1360 memcpy(&proc->fac_list, kvm->arch.model.fac_list, 1361 S390_ARCH_FAC_LIST_SIZE_BYTE); 1362 VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1363 kvm->arch.model.ibc, 1364 kvm->arch.model.cpuid); 1365 VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1366 kvm->arch.model.fac_list[0], 1367 kvm->arch.model.fac_list[1], 1368 kvm->arch.model.fac_list[2]); 1369 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 1370 ret = -EFAULT; 1371 kfree(proc); 1372 out: 1373 return ret; 1374 } 1375 1376 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 1377 { 1378 struct kvm_s390_vm_cpu_machine *mach; 1379 int ret = 0; 1380 1381 mach = kzalloc(sizeof(*mach), GFP_KERNEL); 1382 if (!mach) { 1383 ret = -ENOMEM; 1384 goto out; 1385 } 1386 get_cpu_id((struct cpuid *) &mach->cpuid); 1387 mach->ibc = sclp.ibc; 1388 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, 1389 S390_ARCH_FAC_LIST_SIZE_BYTE); 1390 memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list, 1391 sizeof(S390_lowcore.stfle_fac_list)); 1392 VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx", 1393 kvm->arch.model.ibc, 1394 kvm->arch.model.cpuid); 1395 VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx", 1396 mach->fac_mask[0], 1397 mach->fac_mask[1], 1398 mach->fac_mask[2]); 1399 VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1400 mach->fac_list[0], 1401 mach->fac_list[1], 1402 mach->fac_list[2]); 1403 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 1404 ret = -EFAULT; 1405 kfree(mach); 1406 out: 1407 return ret; 1408 } 1409 1410 static int kvm_s390_get_processor_feat(struct kvm *kvm, 1411 struct kvm_device_attr *attr) 1412 { 1413 struct kvm_s390_vm_cpu_feat data; 1414 1415 bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat, 1416 KVM_S390_VM_CPU_FEAT_NR_BITS); 1417 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1418 return -EFAULT; 1419 VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1420 data.feat[0], 1421 data.feat[1], 1422 data.feat[2]); 1423 return 0; 1424 } 1425 1426 static int kvm_s390_get_machine_feat(struct kvm *kvm, 1427 struct kvm_device_attr *attr) 1428 { 1429 struct kvm_s390_vm_cpu_feat data; 1430 1431 bitmap_copy((unsigned long *) data.feat, 1432 kvm_s390_available_cpu_feat, 1433 KVM_S390_VM_CPU_FEAT_NR_BITS); 1434 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1435 return -EFAULT; 1436 VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1437 data.feat[0], 1438 data.feat[1], 1439 data.feat[2]); 1440 return 0; 1441 } 1442 1443 static int kvm_s390_get_processor_subfunc(struct kvm *kvm, 1444 struct kvm_device_attr *attr) 1445 { 1446 if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs, 1447 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1448 return -EFAULT; 1449 1450 VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1451 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1452 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1453 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1454 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1455 VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1456 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1457 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1458 VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1459 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1460 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1461 VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1462 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1463 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1464 VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx", 1465 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1466 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1467 VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1468 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1469 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1470 VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1471 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1472 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1473 VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1474 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1475 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1476 VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1477 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1478 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1479 VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1480 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1481 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1482 VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1483 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1484 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1485 VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1486 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1487 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1488 VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1489 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1490 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1491 VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1492 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1493 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1494 1495 return 0; 1496 } 1497 1498 static int kvm_s390_get_machine_subfunc(struct kvm *kvm, 1499 struct kvm_device_attr *attr) 1500 { 1501 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, 1502 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1503 return -EFAULT; 1504 1505 VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1506 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0], 1507 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1], 1508 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2], 1509 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]); 1510 VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx", 1511 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0], 1512 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]); 1513 VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx", 1514 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0], 1515 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]); 1516 VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx", 1517 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0], 1518 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]); 1519 VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx", 1520 ((unsigned long *) &kvm_s390_available_subfunc.km)[0], 1521 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]); 1522 VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx", 1523 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0], 1524 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]); 1525 VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx", 1526 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0], 1527 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]); 1528 VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx", 1529 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0], 1530 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]); 1531 VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx", 1532 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0], 1533 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]); 1534 VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx", 1535 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0], 1536 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]); 1537 VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx", 1538 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0], 1539 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]); 1540 VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx", 1541 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0], 1542 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]); 1543 VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx", 1544 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0], 1545 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]); 1546 VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx", 1547 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0], 1548 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]); 1549 1550 return 0; 1551 } 1552 1553 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1554 { 1555 int ret = -ENXIO; 1556 1557 switch (attr->attr) { 1558 case KVM_S390_VM_CPU_PROCESSOR: 1559 ret = kvm_s390_get_processor(kvm, attr); 1560 break; 1561 case KVM_S390_VM_CPU_MACHINE: 1562 ret = kvm_s390_get_machine(kvm, attr); 1563 break; 1564 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1565 ret = kvm_s390_get_processor_feat(kvm, attr); 1566 break; 1567 case KVM_S390_VM_CPU_MACHINE_FEAT: 1568 ret = kvm_s390_get_machine_feat(kvm, attr); 1569 break; 1570 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1571 ret = kvm_s390_get_processor_subfunc(kvm, attr); 1572 break; 1573 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1574 ret = kvm_s390_get_machine_subfunc(kvm, attr); 1575 break; 1576 } 1577 return ret; 1578 } 1579 1580 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1581 { 1582 int ret; 1583 1584 switch (attr->group) { 1585 case KVM_S390_VM_MEM_CTRL: 1586 ret = kvm_s390_set_mem_control(kvm, attr); 1587 break; 1588 case KVM_S390_VM_TOD: 1589 ret = kvm_s390_set_tod(kvm, attr); 1590 break; 1591 case KVM_S390_VM_CPU_MODEL: 1592 ret = kvm_s390_set_cpu_model(kvm, attr); 1593 break; 1594 case KVM_S390_VM_CRYPTO: 1595 ret = kvm_s390_vm_set_crypto(kvm, attr); 1596 break; 1597 case KVM_S390_VM_MIGRATION: 1598 ret = kvm_s390_vm_set_migration(kvm, attr); 1599 break; 1600 default: 1601 ret = -ENXIO; 1602 break; 1603 } 1604 1605 return ret; 1606 } 1607 1608 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1609 { 1610 int ret; 1611 1612 switch (attr->group) { 1613 case KVM_S390_VM_MEM_CTRL: 1614 ret = kvm_s390_get_mem_control(kvm, attr); 1615 break; 1616 case KVM_S390_VM_TOD: 1617 ret = kvm_s390_get_tod(kvm, attr); 1618 break; 1619 case KVM_S390_VM_CPU_MODEL: 1620 ret = kvm_s390_get_cpu_model(kvm, attr); 1621 break; 1622 case KVM_S390_VM_MIGRATION: 1623 ret = kvm_s390_vm_get_migration(kvm, attr); 1624 break; 1625 default: 1626 ret = -ENXIO; 1627 break; 1628 } 1629 1630 return ret; 1631 } 1632 1633 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1634 { 1635 int ret; 1636 1637 switch (attr->group) { 1638 case KVM_S390_VM_MEM_CTRL: 1639 switch (attr->attr) { 1640 case KVM_S390_VM_MEM_ENABLE_CMMA: 1641 case KVM_S390_VM_MEM_CLR_CMMA: 1642 ret = sclp.has_cmma ? 0 : -ENXIO; 1643 break; 1644 case KVM_S390_VM_MEM_LIMIT_SIZE: 1645 ret = 0; 1646 break; 1647 default: 1648 ret = -ENXIO; 1649 break; 1650 } 1651 break; 1652 case KVM_S390_VM_TOD: 1653 switch (attr->attr) { 1654 case KVM_S390_VM_TOD_LOW: 1655 case KVM_S390_VM_TOD_HIGH: 1656 ret = 0; 1657 break; 1658 default: 1659 ret = -ENXIO; 1660 break; 1661 } 1662 break; 1663 case KVM_S390_VM_CPU_MODEL: 1664 switch (attr->attr) { 1665 case KVM_S390_VM_CPU_PROCESSOR: 1666 case KVM_S390_VM_CPU_MACHINE: 1667 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1668 case KVM_S390_VM_CPU_MACHINE_FEAT: 1669 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1670 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1671 ret = 0; 1672 break; 1673 default: 1674 ret = -ENXIO; 1675 break; 1676 } 1677 break; 1678 case KVM_S390_VM_CRYPTO: 1679 switch (attr->attr) { 1680 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 1681 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 1682 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 1683 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 1684 ret = 0; 1685 break; 1686 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 1687 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 1688 ret = ap_instructions_available() ? 0 : -ENXIO; 1689 break; 1690 default: 1691 ret = -ENXIO; 1692 break; 1693 } 1694 break; 1695 case KVM_S390_VM_MIGRATION: 1696 ret = 0; 1697 break; 1698 default: 1699 ret = -ENXIO; 1700 break; 1701 } 1702 1703 return ret; 1704 } 1705 1706 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 1707 { 1708 uint8_t *keys; 1709 uint64_t hva; 1710 int srcu_idx, i, r = 0; 1711 1712 if (args->flags != 0) 1713 return -EINVAL; 1714 1715 /* Is this guest using storage keys? */ 1716 if (!mm_uses_skeys(current->mm)) 1717 return KVM_S390_GET_SKEYS_NONE; 1718 1719 /* Enforce sane limit on memory allocation */ 1720 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 1721 return -EINVAL; 1722 1723 keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL); 1724 if (!keys) 1725 return -ENOMEM; 1726 1727 down_read(¤t->mm->mmap_sem); 1728 srcu_idx = srcu_read_lock(&kvm->srcu); 1729 for (i = 0; i < args->count; i++) { 1730 hva = gfn_to_hva(kvm, args->start_gfn + i); 1731 if (kvm_is_error_hva(hva)) { 1732 r = -EFAULT; 1733 break; 1734 } 1735 1736 r = get_guest_storage_key(current->mm, hva, &keys[i]); 1737 if (r) 1738 break; 1739 } 1740 srcu_read_unlock(&kvm->srcu, srcu_idx); 1741 up_read(¤t->mm->mmap_sem); 1742 1743 if (!r) { 1744 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 1745 sizeof(uint8_t) * args->count); 1746 if (r) 1747 r = -EFAULT; 1748 } 1749 1750 kvfree(keys); 1751 return r; 1752 } 1753 1754 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 1755 { 1756 uint8_t *keys; 1757 uint64_t hva; 1758 int srcu_idx, i, r = 0; 1759 bool unlocked; 1760 1761 if (args->flags != 0) 1762 return -EINVAL; 1763 1764 /* Enforce sane limit on memory allocation */ 1765 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 1766 return -EINVAL; 1767 1768 keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL); 1769 if (!keys) 1770 return -ENOMEM; 1771 1772 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 1773 sizeof(uint8_t) * args->count); 1774 if (r) { 1775 r = -EFAULT; 1776 goto out; 1777 } 1778 1779 /* Enable storage key handling for the guest */ 1780 r = s390_enable_skey(); 1781 if (r) 1782 goto out; 1783 1784 i = 0; 1785 down_read(¤t->mm->mmap_sem); 1786 srcu_idx = srcu_read_lock(&kvm->srcu); 1787 while (i < args->count) { 1788 unlocked = false; 1789 hva = gfn_to_hva(kvm, args->start_gfn + i); 1790 if (kvm_is_error_hva(hva)) { 1791 r = -EFAULT; 1792 break; 1793 } 1794 1795 /* Lowest order bit is reserved */ 1796 if (keys[i] & 0x01) { 1797 r = -EINVAL; 1798 break; 1799 } 1800 1801 r = set_guest_storage_key(current->mm, hva, keys[i], 0); 1802 if (r) { 1803 r = fixup_user_fault(current, current->mm, hva, 1804 FAULT_FLAG_WRITE, &unlocked); 1805 if (r) 1806 break; 1807 } 1808 if (!r) 1809 i++; 1810 } 1811 srcu_read_unlock(&kvm->srcu, srcu_idx); 1812 up_read(¤t->mm->mmap_sem); 1813 out: 1814 kvfree(keys); 1815 return r; 1816 } 1817 1818 /* 1819 * Base address and length must be sent at the start of each block, therefore 1820 * it's cheaper to send some clean data, as long as it's less than the size of 1821 * two longs. 1822 */ 1823 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *)) 1824 /* for consistency */ 1825 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX) 1826 1827 /* 1828 * Similar to gfn_to_memslot, but returns the index of a memslot also when the 1829 * address falls in a hole. In that case the index of one of the memslots 1830 * bordering the hole is returned. 1831 */ 1832 static int gfn_to_memslot_approx(struct kvm_memslots *slots, gfn_t gfn) 1833 { 1834 int start = 0, end = slots->used_slots; 1835 int slot = atomic_read(&slots->lru_slot); 1836 struct kvm_memory_slot *memslots = slots->memslots; 1837 1838 if (gfn >= memslots[slot].base_gfn && 1839 gfn < memslots[slot].base_gfn + memslots[slot].npages) 1840 return slot; 1841 1842 while (start < end) { 1843 slot = start + (end - start) / 2; 1844 1845 if (gfn >= memslots[slot].base_gfn) 1846 end = slot; 1847 else 1848 start = slot + 1; 1849 } 1850 1851 if (gfn >= memslots[start].base_gfn && 1852 gfn < memslots[start].base_gfn + memslots[start].npages) { 1853 atomic_set(&slots->lru_slot, start); 1854 } 1855 1856 return start; 1857 } 1858 1859 static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, 1860 u8 *res, unsigned long bufsize) 1861 { 1862 unsigned long pgstev, hva, cur_gfn = args->start_gfn; 1863 1864 args->count = 0; 1865 while (args->count < bufsize) { 1866 hva = gfn_to_hva(kvm, cur_gfn); 1867 /* 1868 * We return an error if the first value was invalid, but we 1869 * return successfully if at least one value was copied. 1870 */ 1871 if (kvm_is_error_hva(hva)) 1872 return args->count ? 0 : -EFAULT; 1873 if (get_pgste(kvm->mm, hva, &pgstev) < 0) 1874 pgstev = 0; 1875 res[args->count++] = (pgstev >> 24) & 0x43; 1876 cur_gfn++; 1877 } 1878 1879 return 0; 1880 } 1881 1882 static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots, 1883 unsigned long cur_gfn) 1884 { 1885 int slotidx = gfn_to_memslot_approx(slots, cur_gfn); 1886 struct kvm_memory_slot *ms = slots->memslots + slotidx; 1887 unsigned long ofs = cur_gfn - ms->base_gfn; 1888 1889 if (ms->base_gfn + ms->npages <= cur_gfn) { 1890 slotidx--; 1891 /* If we are above the highest slot, wrap around */ 1892 if (slotidx < 0) 1893 slotidx = slots->used_slots - 1; 1894 1895 ms = slots->memslots + slotidx; 1896 ofs = 0; 1897 } 1898 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs); 1899 while ((slotidx > 0) && (ofs >= ms->npages)) { 1900 slotidx--; 1901 ms = slots->memslots + slotidx; 1902 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, 0); 1903 } 1904 return ms->base_gfn + ofs; 1905 } 1906 1907 static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, 1908 u8 *res, unsigned long bufsize) 1909 { 1910 unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev; 1911 struct kvm_memslots *slots = kvm_memslots(kvm); 1912 struct kvm_memory_slot *ms; 1913 1914 cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn); 1915 ms = gfn_to_memslot(kvm, cur_gfn); 1916 args->count = 0; 1917 args->start_gfn = cur_gfn; 1918 if (!ms) 1919 return 0; 1920 next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); 1921 mem_end = slots->memslots[0].base_gfn + slots->memslots[0].npages; 1922 1923 while (args->count < bufsize) { 1924 hva = gfn_to_hva(kvm, cur_gfn); 1925 if (kvm_is_error_hva(hva)) 1926 return 0; 1927 /* Decrement only if we actually flipped the bit to 0 */ 1928 if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 1929 atomic64_dec(&kvm->arch.cmma_dirty_pages); 1930 if (get_pgste(kvm->mm, hva, &pgstev) < 0) 1931 pgstev = 0; 1932 /* Save the value */ 1933 res[args->count++] = (pgstev >> 24) & 0x43; 1934 /* If the next bit is too far away, stop. */ 1935 if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE) 1936 return 0; 1937 /* If we reached the previous "next", find the next one */ 1938 if (cur_gfn == next_gfn) 1939 next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); 1940 /* Reached the end of memory or of the buffer, stop */ 1941 if ((next_gfn >= mem_end) || 1942 (next_gfn - args->start_gfn >= bufsize)) 1943 return 0; 1944 cur_gfn++; 1945 /* Reached the end of the current memslot, take the next one. */ 1946 if (cur_gfn - ms->base_gfn >= ms->npages) { 1947 ms = gfn_to_memslot(kvm, cur_gfn); 1948 if (!ms) 1949 return 0; 1950 } 1951 } 1952 return 0; 1953 } 1954 1955 /* 1956 * This function searches for the next page with dirty CMMA attributes, and 1957 * saves the attributes in the buffer up to either the end of the buffer or 1958 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found; 1959 * no trailing clean bytes are saved. 1960 * In case no dirty bits were found, or if CMMA was not enabled or used, the 1961 * output buffer will indicate 0 as length. 1962 */ 1963 static int kvm_s390_get_cmma_bits(struct kvm *kvm, 1964 struct kvm_s390_cmma_log *args) 1965 { 1966 unsigned long bufsize; 1967 int srcu_idx, peek, ret; 1968 u8 *values; 1969 1970 if (!kvm->arch.use_cmma) 1971 return -ENXIO; 1972 /* Invalid/unsupported flags were specified */ 1973 if (args->flags & ~KVM_S390_CMMA_PEEK) 1974 return -EINVAL; 1975 /* Migration mode query, and we are not doing a migration */ 1976 peek = !!(args->flags & KVM_S390_CMMA_PEEK); 1977 if (!peek && !kvm->arch.migration_mode) 1978 return -EINVAL; 1979 /* CMMA is disabled or was not used, or the buffer has length zero */ 1980 bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX); 1981 if (!bufsize || !kvm->mm->context.uses_cmm) { 1982 memset(args, 0, sizeof(*args)); 1983 return 0; 1984 } 1985 /* We are not peeking, and there are no dirty pages */ 1986 if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) { 1987 memset(args, 0, sizeof(*args)); 1988 return 0; 1989 } 1990 1991 values = vmalloc(bufsize); 1992 if (!values) 1993 return -ENOMEM; 1994 1995 down_read(&kvm->mm->mmap_sem); 1996 srcu_idx = srcu_read_lock(&kvm->srcu); 1997 if (peek) 1998 ret = kvm_s390_peek_cmma(kvm, args, values, bufsize); 1999 else 2000 ret = kvm_s390_get_cmma(kvm, args, values, bufsize); 2001 srcu_read_unlock(&kvm->srcu, srcu_idx); 2002 up_read(&kvm->mm->mmap_sem); 2003 2004 if (kvm->arch.migration_mode) 2005 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages); 2006 else 2007 args->remaining = 0; 2008 2009 if (copy_to_user((void __user *)args->values, values, args->count)) 2010 ret = -EFAULT; 2011 2012 vfree(values); 2013 return ret; 2014 } 2015 2016 /* 2017 * This function sets the CMMA attributes for the given pages. If the input 2018 * buffer has zero length, no action is taken, otherwise the attributes are 2019 * set and the mm->context.uses_cmm flag is set. 2020 */ 2021 static int kvm_s390_set_cmma_bits(struct kvm *kvm, 2022 const struct kvm_s390_cmma_log *args) 2023 { 2024 unsigned long hva, mask, pgstev, i; 2025 uint8_t *bits; 2026 int srcu_idx, r = 0; 2027 2028 mask = args->mask; 2029 2030 if (!kvm->arch.use_cmma) 2031 return -ENXIO; 2032 /* invalid/unsupported flags */ 2033 if (args->flags != 0) 2034 return -EINVAL; 2035 /* Enforce sane limit on memory allocation */ 2036 if (args->count > KVM_S390_CMMA_SIZE_MAX) 2037 return -EINVAL; 2038 /* Nothing to do */ 2039 if (args->count == 0) 2040 return 0; 2041 2042 bits = vmalloc(array_size(sizeof(*bits), args->count)); 2043 if (!bits) 2044 return -ENOMEM; 2045 2046 r = copy_from_user(bits, (void __user *)args->values, args->count); 2047 if (r) { 2048 r = -EFAULT; 2049 goto out; 2050 } 2051 2052 down_read(&kvm->mm->mmap_sem); 2053 srcu_idx = srcu_read_lock(&kvm->srcu); 2054 for (i = 0; i < args->count; i++) { 2055 hva = gfn_to_hva(kvm, args->start_gfn + i); 2056 if (kvm_is_error_hva(hva)) { 2057 r = -EFAULT; 2058 break; 2059 } 2060 2061 pgstev = bits[i]; 2062 pgstev = pgstev << 24; 2063 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT; 2064 set_pgste_bits(kvm->mm, hva, mask, pgstev); 2065 } 2066 srcu_read_unlock(&kvm->srcu, srcu_idx); 2067 up_read(&kvm->mm->mmap_sem); 2068 2069 if (!kvm->mm->context.uses_cmm) { 2070 down_write(&kvm->mm->mmap_sem); 2071 kvm->mm->context.uses_cmm = 1; 2072 up_write(&kvm->mm->mmap_sem); 2073 } 2074 out: 2075 vfree(bits); 2076 return r; 2077 } 2078 2079 long kvm_arch_vm_ioctl(struct file *filp, 2080 unsigned int ioctl, unsigned long arg) 2081 { 2082 struct kvm *kvm = filp->private_data; 2083 void __user *argp = (void __user *)arg; 2084 struct kvm_device_attr attr; 2085 int r; 2086 2087 switch (ioctl) { 2088 case KVM_S390_INTERRUPT: { 2089 struct kvm_s390_interrupt s390int; 2090 2091 r = -EFAULT; 2092 if (copy_from_user(&s390int, argp, sizeof(s390int))) 2093 break; 2094 r = kvm_s390_inject_vm(kvm, &s390int); 2095 break; 2096 } 2097 case KVM_CREATE_IRQCHIP: { 2098 struct kvm_irq_routing_entry routing; 2099 2100 r = -EINVAL; 2101 if (kvm->arch.use_irqchip) { 2102 /* Set up dummy routing. */ 2103 memset(&routing, 0, sizeof(routing)); 2104 r = kvm_set_irq_routing(kvm, &routing, 0, 0); 2105 } 2106 break; 2107 } 2108 case KVM_SET_DEVICE_ATTR: { 2109 r = -EFAULT; 2110 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2111 break; 2112 r = kvm_s390_vm_set_attr(kvm, &attr); 2113 break; 2114 } 2115 case KVM_GET_DEVICE_ATTR: { 2116 r = -EFAULT; 2117 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2118 break; 2119 r = kvm_s390_vm_get_attr(kvm, &attr); 2120 break; 2121 } 2122 case KVM_HAS_DEVICE_ATTR: { 2123 r = -EFAULT; 2124 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2125 break; 2126 r = kvm_s390_vm_has_attr(kvm, &attr); 2127 break; 2128 } 2129 case KVM_S390_GET_SKEYS: { 2130 struct kvm_s390_skeys args; 2131 2132 r = -EFAULT; 2133 if (copy_from_user(&args, argp, 2134 sizeof(struct kvm_s390_skeys))) 2135 break; 2136 r = kvm_s390_get_skeys(kvm, &args); 2137 break; 2138 } 2139 case KVM_S390_SET_SKEYS: { 2140 struct kvm_s390_skeys args; 2141 2142 r = -EFAULT; 2143 if (copy_from_user(&args, argp, 2144 sizeof(struct kvm_s390_skeys))) 2145 break; 2146 r = kvm_s390_set_skeys(kvm, &args); 2147 break; 2148 } 2149 case KVM_S390_GET_CMMA_BITS: { 2150 struct kvm_s390_cmma_log args; 2151 2152 r = -EFAULT; 2153 if (copy_from_user(&args, argp, sizeof(args))) 2154 break; 2155 mutex_lock(&kvm->slots_lock); 2156 r = kvm_s390_get_cmma_bits(kvm, &args); 2157 mutex_unlock(&kvm->slots_lock); 2158 if (!r) { 2159 r = copy_to_user(argp, &args, sizeof(args)); 2160 if (r) 2161 r = -EFAULT; 2162 } 2163 break; 2164 } 2165 case KVM_S390_SET_CMMA_BITS: { 2166 struct kvm_s390_cmma_log args; 2167 2168 r = -EFAULT; 2169 if (copy_from_user(&args, argp, sizeof(args))) 2170 break; 2171 mutex_lock(&kvm->slots_lock); 2172 r = kvm_s390_set_cmma_bits(kvm, &args); 2173 mutex_unlock(&kvm->slots_lock); 2174 break; 2175 } 2176 default: 2177 r = -ENOTTY; 2178 } 2179 2180 return r; 2181 } 2182 2183 static int kvm_s390_apxa_installed(void) 2184 { 2185 struct ap_config_info info; 2186 2187 if (ap_instructions_available()) { 2188 if (ap_qci(&info) == 0) 2189 return info.apxa; 2190 } 2191 2192 return 0; 2193 } 2194 2195 /* 2196 * The format of the crypto control block (CRYCB) is specified in the 3 low 2197 * order bits of the CRYCB designation (CRYCBD) field as follows: 2198 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the 2199 * AP extended addressing (APXA) facility are installed. 2200 * Format 1: The APXA facility is not installed but the MSAX3 facility is. 2201 * Format 2: Both the APXA and MSAX3 facilities are installed 2202 */ 2203 static void kvm_s390_set_crycb_format(struct kvm *kvm) 2204 { 2205 kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb; 2206 2207 /* Clear the CRYCB format bits - i.e., set format 0 by default */ 2208 kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK); 2209 2210 /* Check whether MSAX3 is installed */ 2211 if (!test_kvm_facility(kvm, 76)) 2212 return; 2213 2214 if (kvm_s390_apxa_installed()) 2215 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 2216 else 2217 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 2218 } 2219 2220 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, 2221 unsigned long *aqm, unsigned long *adm) 2222 { 2223 struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb; 2224 2225 mutex_lock(&kvm->lock); 2226 kvm_s390_vcpu_block_all(kvm); 2227 2228 switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { 2229 case CRYCB_FORMAT2: /* APCB1 use 256 bits */ 2230 memcpy(crycb->apcb1.apm, apm, 32); 2231 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx", 2232 apm[0], apm[1], apm[2], apm[3]); 2233 memcpy(crycb->apcb1.aqm, aqm, 32); 2234 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx", 2235 aqm[0], aqm[1], aqm[2], aqm[3]); 2236 memcpy(crycb->apcb1.adm, adm, 32); 2237 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx", 2238 adm[0], adm[1], adm[2], adm[3]); 2239 break; 2240 case CRYCB_FORMAT1: 2241 case CRYCB_FORMAT0: /* Fall through both use APCB0 */ 2242 memcpy(crycb->apcb0.apm, apm, 8); 2243 memcpy(crycb->apcb0.aqm, aqm, 2); 2244 memcpy(crycb->apcb0.adm, adm, 2); 2245 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x", 2246 apm[0], *((unsigned short *)aqm), 2247 *((unsigned short *)adm)); 2248 break; 2249 default: /* Can not happen */ 2250 break; 2251 } 2252 2253 /* recreate the shadow crycb for each vcpu */ 2254 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 2255 kvm_s390_vcpu_unblock_all(kvm); 2256 mutex_unlock(&kvm->lock); 2257 } 2258 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks); 2259 2260 void kvm_arch_crypto_clear_masks(struct kvm *kvm) 2261 { 2262 mutex_lock(&kvm->lock); 2263 kvm_s390_vcpu_block_all(kvm); 2264 2265 memset(&kvm->arch.crypto.crycb->apcb0, 0, 2266 sizeof(kvm->arch.crypto.crycb->apcb0)); 2267 memset(&kvm->arch.crypto.crycb->apcb1, 0, 2268 sizeof(kvm->arch.crypto.crycb->apcb1)); 2269 2270 VM_EVENT(kvm, 3, "%s", "CLR CRYCB:"); 2271 /* recreate the shadow crycb for each vcpu */ 2272 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 2273 kvm_s390_vcpu_unblock_all(kvm); 2274 mutex_unlock(&kvm->lock); 2275 } 2276 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks); 2277 2278 static u64 kvm_s390_get_initial_cpuid(void) 2279 { 2280 struct cpuid cpuid; 2281 2282 get_cpu_id(&cpuid); 2283 cpuid.version = 0xff; 2284 return *((u64 *) &cpuid); 2285 } 2286 2287 static void kvm_s390_crypto_init(struct kvm *kvm) 2288 { 2289 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; 2290 kvm_s390_set_crycb_format(kvm); 2291 2292 if (!test_kvm_facility(kvm, 76)) 2293 return; 2294 2295 /* Enable AES/DEA protected key functions by default */ 2296 kvm->arch.crypto.aes_kw = 1; 2297 kvm->arch.crypto.dea_kw = 1; 2298 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 2299 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 2300 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 2301 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 2302 } 2303 2304 static void sca_dispose(struct kvm *kvm) 2305 { 2306 if (kvm->arch.use_esca) 2307 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block)); 2308 else 2309 free_page((unsigned long)(kvm->arch.sca)); 2310 kvm->arch.sca = NULL; 2311 } 2312 2313 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 2314 { 2315 gfp_t alloc_flags = GFP_KERNEL; 2316 int i, rc; 2317 char debug_name[16]; 2318 static unsigned long sca_offset; 2319 2320 rc = -EINVAL; 2321 #ifdef CONFIG_KVM_S390_UCONTROL 2322 if (type & ~KVM_VM_S390_UCONTROL) 2323 goto out_err; 2324 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 2325 goto out_err; 2326 #else 2327 if (type) 2328 goto out_err; 2329 #endif 2330 2331 rc = s390_enable_sie(); 2332 if (rc) 2333 goto out_err; 2334 2335 rc = -ENOMEM; 2336 2337 if (!sclp.has_64bscao) 2338 alloc_flags |= GFP_DMA; 2339 rwlock_init(&kvm->arch.sca_lock); 2340 /* start with basic SCA */ 2341 kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags); 2342 if (!kvm->arch.sca) 2343 goto out_err; 2344 spin_lock(&kvm_lock); 2345 sca_offset += 16; 2346 if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE) 2347 sca_offset = 0; 2348 kvm->arch.sca = (struct bsca_block *) 2349 ((char *) kvm->arch.sca + sca_offset); 2350 spin_unlock(&kvm_lock); 2351 2352 sprintf(debug_name, "kvm-%u", current->pid); 2353 2354 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 2355 if (!kvm->arch.dbf) 2356 goto out_err; 2357 2358 BUILD_BUG_ON(sizeof(struct sie_page2) != 4096); 2359 kvm->arch.sie_page2 = 2360 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 2361 if (!kvm->arch.sie_page2) 2362 goto out_err; 2363 2364 kvm->arch.sie_page2->kvm = kvm; 2365 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; 2366 2367 for (i = 0; i < kvm_s390_fac_size(); i++) { 2368 kvm->arch.model.fac_mask[i] = S390_lowcore.stfle_fac_list[i] & 2369 (kvm_s390_fac_base[i] | 2370 kvm_s390_fac_ext[i]); 2371 kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] & 2372 kvm_s390_fac_base[i]; 2373 } 2374 kvm->arch.model.subfuncs = kvm_s390_available_subfunc; 2375 2376 /* we are always in czam mode - even on pre z14 machines */ 2377 set_kvm_facility(kvm->arch.model.fac_mask, 138); 2378 set_kvm_facility(kvm->arch.model.fac_list, 138); 2379 /* we emulate STHYI in kvm */ 2380 set_kvm_facility(kvm->arch.model.fac_mask, 74); 2381 set_kvm_facility(kvm->arch.model.fac_list, 74); 2382 if (MACHINE_HAS_TLB_GUEST) { 2383 set_kvm_facility(kvm->arch.model.fac_mask, 147); 2384 set_kvm_facility(kvm->arch.model.fac_list, 147); 2385 } 2386 2387 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); 2388 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 2389 2390 kvm_s390_crypto_init(kvm); 2391 2392 mutex_init(&kvm->arch.float_int.ais_lock); 2393 spin_lock_init(&kvm->arch.float_int.lock); 2394 for (i = 0; i < FIRQ_LIST_COUNT; i++) 2395 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 2396 init_waitqueue_head(&kvm->arch.ipte_wq); 2397 mutex_init(&kvm->arch.ipte_mutex); 2398 2399 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 2400 VM_EVENT(kvm, 3, "vm created with type %lu", type); 2401 2402 if (type & KVM_VM_S390_UCONTROL) { 2403 kvm->arch.gmap = NULL; 2404 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT; 2405 } else { 2406 if (sclp.hamax == U64_MAX) 2407 kvm->arch.mem_limit = TASK_SIZE_MAX; 2408 else 2409 kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX, 2410 sclp.hamax + 1); 2411 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1); 2412 if (!kvm->arch.gmap) 2413 goto out_err; 2414 kvm->arch.gmap->private = kvm; 2415 kvm->arch.gmap->pfault_enabled = 0; 2416 } 2417 2418 kvm->arch.use_pfmfi = sclp.has_pfmfi; 2419 kvm->arch.use_skf = sclp.has_skey; 2420 spin_lock_init(&kvm->arch.start_stop_lock); 2421 kvm_s390_vsie_init(kvm); 2422 kvm_s390_gisa_init(kvm); 2423 KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid); 2424 2425 return 0; 2426 out_err: 2427 free_page((unsigned long)kvm->arch.sie_page2); 2428 debug_unregister(kvm->arch.dbf); 2429 sca_dispose(kvm); 2430 KVM_EVENT(3, "creation of vm failed: %d", rc); 2431 return rc; 2432 } 2433 2434 bool kvm_arch_has_vcpu_debugfs(void) 2435 { 2436 return false; 2437 } 2438 2439 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu) 2440 { 2441 return 0; 2442 } 2443 2444 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 2445 { 2446 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 2447 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 2448 kvm_s390_clear_local_irqs(vcpu); 2449 kvm_clear_async_pf_completion_queue(vcpu); 2450 if (!kvm_is_ucontrol(vcpu->kvm)) 2451 sca_del_vcpu(vcpu); 2452 2453 if (kvm_is_ucontrol(vcpu->kvm)) 2454 gmap_remove(vcpu->arch.gmap); 2455 2456 if (vcpu->kvm->arch.use_cmma) 2457 kvm_s390_vcpu_unsetup_cmma(vcpu); 2458 free_page((unsigned long)(vcpu->arch.sie_block)); 2459 2460 kvm_vcpu_uninit(vcpu); 2461 kmem_cache_free(kvm_vcpu_cache, vcpu); 2462 } 2463 2464 static void kvm_free_vcpus(struct kvm *kvm) 2465 { 2466 unsigned int i; 2467 struct kvm_vcpu *vcpu; 2468 2469 kvm_for_each_vcpu(i, vcpu, kvm) 2470 kvm_arch_vcpu_destroy(vcpu); 2471 2472 mutex_lock(&kvm->lock); 2473 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 2474 kvm->vcpus[i] = NULL; 2475 2476 atomic_set(&kvm->online_vcpus, 0); 2477 mutex_unlock(&kvm->lock); 2478 } 2479 2480 void kvm_arch_destroy_vm(struct kvm *kvm) 2481 { 2482 kvm_free_vcpus(kvm); 2483 sca_dispose(kvm); 2484 debug_unregister(kvm->arch.dbf); 2485 kvm_s390_gisa_destroy(kvm); 2486 free_page((unsigned long)kvm->arch.sie_page2); 2487 if (!kvm_is_ucontrol(kvm)) 2488 gmap_remove(kvm->arch.gmap); 2489 kvm_s390_destroy_adapters(kvm); 2490 kvm_s390_clear_float_irqs(kvm); 2491 kvm_s390_vsie_destroy(kvm); 2492 KVM_EVENT(3, "vm 0x%pK destroyed", kvm); 2493 } 2494 2495 /* Section: vcpu related */ 2496 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) 2497 { 2498 vcpu->arch.gmap = gmap_create(current->mm, -1UL); 2499 if (!vcpu->arch.gmap) 2500 return -ENOMEM; 2501 vcpu->arch.gmap->private = vcpu->kvm; 2502 2503 return 0; 2504 } 2505 2506 static void sca_del_vcpu(struct kvm_vcpu *vcpu) 2507 { 2508 if (!kvm_s390_use_sca_entries()) 2509 return; 2510 read_lock(&vcpu->kvm->arch.sca_lock); 2511 if (vcpu->kvm->arch.use_esca) { 2512 struct esca_block *sca = vcpu->kvm->arch.sca; 2513 2514 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); 2515 sca->cpu[vcpu->vcpu_id].sda = 0; 2516 } else { 2517 struct bsca_block *sca = vcpu->kvm->arch.sca; 2518 2519 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); 2520 sca->cpu[vcpu->vcpu_id].sda = 0; 2521 } 2522 read_unlock(&vcpu->kvm->arch.sca_lock); 2523 } 2524 2525 static void sca_add_vcpu(struct kvm_vcpu *vcpu) 2526 { 2527 if (!kvm_s390_use_sca_entries()) { 2528 struct bsca_block *sca = vcpu->kvm->arch.sca; 2529 2530 /* we still need the basic sca for the ipte control */ 2531 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 2532 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; 2533 return; 2534 } 2535 read_lock(&vcpu->kvm->arch.sca_lock); 2536 if (vcpu->kvm->arch.use_esca) { 2537 struct esca_block *sca = vcpu->kvm->arch.sca; 2538 2539 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; 2540 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 2541 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU; 2542 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 2543 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); 2544 } else { 2545 struct bsca_block *sca = vcpu->kvm->arch.sca; 2546 2547 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; 2548 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 2549 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; 2550 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); 2551 } 2552 read_unlock(&vcpu->kvm->arch.sca_lock); 2553 } 2554 2555 /* Basic SCA to Extended SCA data copy routines */ 2556 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s) 2557 { 2558 d->sda = s->sda; 2559 d->sigp_ctrl.c = s->sigp_ctrl.c; 2560 d->sigp_ctrl.scn = s->sigp_ctrl.scn; 2561 } 2562 2563 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s) 2564 { 2565 int i; 2566 2567 d->ipte_control = s->ipte_control; 2568 d->mcn[0] = s->mcn; 2569 for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++) 2570 sca_copy_entry(&d->cpu[i], &s->cpu[i]); 2571 } 2572 2573 static int sca_switch_to_extended(struct kvm *kvm) 2574 { 2575 struct bsca_block *old_sca = kvm->arch.sca; 2576 struct esca_block *new_sca; 2577 struct kvm_vcpu *vcpu; 2578 unsigned int vcpu_idx; 2579 u32 scaol, scaoh; 2580 2581 new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO); 2582 if (!new_sca) 2583 return -ENOMEM; 2584 2585 scaoh = (u32)((u64)(new_sca) >> 32); 2586 scaol = (u32)(u64)(new_sca) & ~0x3fU; 2587 2588 kvm_s390_vcpu_block_all(kvm); 2589 write_lock(&kvm->arch.sca_lock); 2590 2591 sca_copy_b_to_e(new_sca, old_sca); 2592 2593 kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) { 2594 vcpu->arch.sie_block->scaoh = scaoh; 2595 vcpu->arch.sie_block->scaol = scaol; 2596 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 2597 } 2598 kvm->arch.sca = new_sca; 2599 kvm->arch.use_esca = 1; 2600 2601 write_unlock(&kvm->arch.sca_lock); 2602 kvm_s390_vcpu_unblock_all(kvm); 2603 2604 free_page((unsigned long)old_sca); 2605 2606 VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)", 2607 old_sca, kvm->arch.sca); 2608 return 0; 2609 } 2610 2611 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) 2612 { 2613 int rc; 2614 2615 if (!kvm_s390_use_sca_entries()) { 2616 if (id < KVM_MAX_VCPUS) 2617 return true; 2618 return false; 2619 } 2620 if (id < KVM_S390_BSCA_CPU_SLOTS) 2621 return true; 2622 if (!sclp.has_esca || !sclp.has_64bscao) 2623 return false; 2624 2625 mutex_lock(&kvm->lock); 2626 rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm); 2627 mutex_unlock(&kvm->lock); 2628 2629 return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS; 2630 } 2631 2632 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 2633 { 2634 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 2635 kvm_clear_async_pf_completion_queue(vcpu); 2636 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 2637 KVM_SYNC_GPRS | 2638 KVM_SYNC_ACRS | 2639 KVM_SYNC_CRS | 2640 KVM_SYNC_ARCH0 | 2641 KVM_SYNC_PFAULT; 2642 kvm_s390_set_prefix(vcpu, 0); 2643 if (test_kvm_facility(vcpu->kvm, 64)) 2644 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; 2645 if (test_kvm_facility(vcpu->kvm, 82)) 2646 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC; 2647 if (test_kvm_facility(vcpu->kvm, 133)) 2648 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB; 2649 if (test_kvm_facility(vcpu->kvm, 156)) 2650 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN; 2651 /* fprs can be synchronized via vrs, even if the guest has no vx. With 2652 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format. 2653 */ 2654 if (MACHINE_HAS_VX) 2655 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 2656 else 2657 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; 2658 2659 if (kvm_is_ucontrol(vcpu->kvm)) 2660 return __kvm_ucontrol_vcpu_init(vcpu); 2661 2662 return 0; 2663 } 2664 2665 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2666 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2667 { 2668 WARN_ON_ONCE(vcpu->arch.cputm_start != 0); 2669 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 2670 vcpu->arch.cputm_start = get_tod_clock_fast(); 2671 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 2672 } 2673 2674 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2675 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2676 { 2677 WARN_ON_ONCE(vcpu->arch.cputm_start == 0); 2678 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 2679 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; 2680 vcpu->arch.cputm_start = 0; 2681 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 2682 } 2683 2684 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2685 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2686 { 2687 WARN_ON_ONCE(vcpu->arch.cputm_enabled); 2688 vcpu->arch.cputm_enabled = true; 2689 __start_cpu_timer_accounting(vcpu); 2690 } 2691 2692 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2693 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2694 { 2695 WARN_ON_ONCE(!vcpu->arch.cputm_enabled); 2696 __stop_cpu_timer_accounting(vcpu); 2697 vcpu->arch.cputm_enabled = false; 2698 } 2699 2700 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2701 { 2702 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2703 __enable_cpu_timer_accounting(vcpu); 2704 preempt_enable(); 2705 } 2706 2707 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2708 { 2709 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2710 __disable_cpu_timer_accounting(vcpu); 2711 preempt_enable(); 2712 } 2713 2714 /* set the cpu timer - may only be called from the VCPU thread itself */ 2715 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) 2716 { 2717 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2718 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 2719 if (vcpu->arch.cputm_enabled) 2720 vcpu->arch.cputm_start = get_tod_clock_fast(); 2721 vcpu->arch.sie_block->cputm = cputm; 2722 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 2723 preempt_enable(); 2724 } 2725 2726 /* update and get the cpu timer - can also be called from other VCPU threads */ 2727 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) 2728 { 2729 unsigned int seq; 2730 __u64 value; 2731 2732 if (unlikely(!vcpu->arch.cputm_enabled)) 2733 return vcpu->arch.sie_block->cputm; 2734 2735 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2736 do { 2737 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); 2738 /* 2739 * If the writer would ever execute a read in the critical 2740 * section, e.g. in irq context, we have a deadlock. 2741 */ 2742 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); 2743 value = vcpu->arch.sie_block->cputm; 2744 /* if cputm_start is 0, accounting is being started/stopped */ 2745 if (likely(vcpu->arch.cputm_start)) 2746 value -= get_tod_clock_fast() - vcpu->arch.cputm_start; 2747 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); 2748 preempt_enable(); 2749 return value; 2750 } 2751 2752 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 2753 { 2754 2755 gmap_enable(vcpu->arch.enabled_gmap); 2756 kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING); 2757 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 2758 __start_cpu_timer_accounting(vcpu); 2759 vcpu->cpu = cpu; 2760 } 2761 2762 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 2763 { 2764 vcpu->cpu = -1; 2765 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 2766 __stop_cpu_timer_accounting(vcpu); 2767 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING); 2768 vcpu->arch.enabled_gmap = gmap_get_enabled(); 2769 gmap_disable(vcpu->arch.enabled_gmap); 2770 2771 } 2772 2773 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) 2774 { 2775 /* this equals initial cpu reset in pop, but we don't switch to ESA */ 2776 vcpu->arch.sie_block->gpsw.mask = 0UL; 2777 vcpu->arch.sie_block->gpsw.addr = 0UL; 2778 kvm_s390_set_prefix(vcpu, 0); 2779 kvm_s390_set_cpu_timer(vcpu, 0); 2780 vcpu->arch.sie_block->ckc = 0UL; 2781 vcpu->arch.sie_block->todpr = 0; 2782 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); 2783 vcpu->arch.sie_block->gcr[0] = CR0_UNUSED_56 | 2784 CR0_INTERRUPT_KEY_SUBMASK | 2785 CR0_MEASUREMENT_ALERT_SUBMASK; 2786 vcpu->arch.sie_block->gcr[14] = CR14_UNUSED_32 | 2787 CR14_UNUSED_33 | 2788 CR14_EXTERNAL_DAMAGE_SUBMASK; 2789 /* make sure the new fpc will be lazily loaded */ 2790 save_fpu_regs(); 2791 current->thread.fpu.fpc = 0; 2792 vcpu->arch.sie_block->gbea = 1; 2793 vcpu->arch.sie_block->pp = 0; 2794 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 2795 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 2796 kvm_clear_async_pf_completion_queue(vcpu); 2797 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 2798 kvm_s390_vcpu_stop(vcpu); 2799 kvm_s390_clear_local_irqs(vcpu); 2800 } 2801 2802 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 2803 { 2804 mutex_lock(&vcpu->kvm->lock); 2805 preempt_disable(); 2806 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 2807 vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx; 2808 preempt_enable(); 2809 mutex_unlock(&vcpu->kvm->lock); 2810 if (!kvm_is_ucontrol(vcpu->kvm)) { 2811 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 2812 sca_add_vcpu(vcpu); 2813 } 2814 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0) 2815 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 2816 /* make vcpu_load load the right gmap on the first trigger */ 2817 vcpu->arch.enabled_gmap = vcpu->arch.gmap; 2818 } 2819 2820 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 2821 { 2822 /* 2823 * If the AP instructions are not being interpreted and the MSAX3 2824 * facility is not configured for the guest, there is nothing to set up. 2825 */ 2826 if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76)) 2827 return; 2828 2829 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 2830 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 2831 vcpu->arch.sie_block->eca &= ~ECA_APIE; 2832 2833 if (vcpu->kvm->arch.crypto.apie) 2834 vcpu->arch.sie_block->eca |= ECA_APIE; 2835 2836 /* Set up protected key support */ 2837 if (vcpu->kvm->arch.crypto.aes_kw) 2838 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 2839 if (vcpu->kvm->arch.crypto.dea_kw) 2840 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 2841 } 2842 2843 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 2844 { 2845 free_page(vcpu->arch.sie_block->cbrlo); 2846 vcpu->arch.sie_block->cbrlo = 0; 2847 } 2848 2849 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 2850 { 2851 vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL); 2852 if (!vcpu->arch.sie_block->cbrlo) 2853 return -ENOMEM; 2854 return 0; 2855 } 2856 2857 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 2858 { 2859 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 2860 2861 vcpu->arch.sie_block->ibc = model->ibc; 2862 if (test_kvm_facility(vcpu->kvm, 7)) 2863 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list; 2864 } 2865 2866 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 2867 { 2868 int rc = 0; 2869 2870 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 2871 CPUSTAT_SM | 2872 CPUSTAT_STOPPED); 2873 2874 if (test_kvm_facility(vcpu->kvm, 78)) 2875 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2); 2876 else if (test_kvm_facility(vcpu->kvm, 8)) 2877 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED); 2878 2879 kvm_s390_vcpu_setup_model(vcpu); 2880 2881 /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */ 2882 if (MACHINE_HAS_ESOP) 2883 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT; 2884 if (test_kvm_facility(vcpu->kvm, 9)) 2885 vcpu->arch.sie_block->ecb |= ECB_SRSI; 2886 if (test_kvm_facility(vcpu->kvm, 73)) 2887 vcpu->arch.sie_block->ecb |= ECB_TE; 2888 2889 if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi) 2890 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI; 2891 if (test_kvm_facility(vcpu->kvm, 130)) 2892 vcpu->arch.sie_block->ecb2 |= ECB2_IEP; 2893 vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI; 2894 if (sclp.has_cei) 2895 vcpu->arch.sie_block->eca |= ECA_CEI; 2896 if (sclp.has_ib) 2897 vcpu->arch.sie_block->eca |= ECA_IB; 2898 if (sclp.has_siif) 2899 vcpu->arch.sie_block->eca |= ECA_SII; 2900 if (sclp.has_sigpif) 2901 vcpu->arch.sie_block->eca |= ECA_SIGPI; 2902 if (test_kvm_facility(vcpu->kvm, 129)) { 2903 vcpu->arch.sie_block->eca |= ECA_VX; 2904 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 2905 } 2906 if (test_kvm_facility(vcpu->kvm, 139)) 2907 vcpu->arch.sie_block->ecd |= ECD_MEF; 2908 if (test_kvm_facility(vcpu->kvm, 156)) 2909 vcpu->arch.sie_block->ecd |= ECD_ETOKENF; 2910 if (vcpu->arch.sie_block->gd) { 2911 vcpu->arch.sie_block->eca |= ECA_AIV; 2912 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", 2913 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); 2914 } 2915 vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx) 2916 | SDNXC; 2917 vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb; 2918 2919 if (sclp.has_kss) 2920 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); 2921 else 2922 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 2923 2924 if (vcpu->kvm->arch.use_cmma) { 2925 rc = kvm_s390_vcpu_setup_cmma(vcpu); 2926 if (rc) 2927 return rc; 2928 } 2929 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 2930 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; 2931 2932 vcpu->arch.sie_block->hpid = HPID_KVM; 2933 2934 kvm_s390_vcpu_crypto_setup(vcpu); 2935 2936 return rc; 2937 } 2938 2939 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 2940 unsigned int id) 2941 { 2942 struct kvm_vcpu *vcpu; 2943 struct sie_page *sie_page; 2944 int rc = -EINVAL; 2945 2946 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) 2947 goto out; 2948 2949 rc = -ENOMEM; 2950 2951 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); 2952 if (!vcpu) 2953 goto out; 2954 2955 BUILD_BUG_ON(sizeof(struct sie_page) != 4096); 2956 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL); 2957 if (!sie_page) 2958 goto out_free_cpu; 2959 2960 vcpu->arch.sie_block = &sie_page->sie_block; 2961 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; 2962 2963 /* the real guest size will always be smaller than msl */ 2964 vcpu->arch.sie_block->mso = 0; 2965 vcpu->arch.sie_block->msl = sclp.hamax; 2966 2967 vcpu->arch.sie_block->icpua = id; 2968 spin_lock_init(&vcpu->arch.local_int.lock); 2969 vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa_int.origin; 2970 if (vcpu->arch.sie_block->gd && sclp.has_gisaf) 2971 vcpu->arch.sie_block->gd |= GISA_FORMAT1; 2972 seqcount_init(&vcpu->arch.cputm_seqcount); 2973 2974 rc = kvm_vcpu_init(vcpu, kvm, id); 2975 if (rc) 2976 goto out_free_sie_block; 2977 VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu, 2978 vcpu->arch.sie_block); 2979 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); 2980 2981 return vcpu; 2982 out_free_sie_block: 2983 free_page((unsigned long)(vcpu->arch.sie_block)); 2984 out_free_cpu: 2985 kmem_cache_free(kvm_vcpu_cache, vcpu); 2986 out: 2987 return ERR_PTR(rc); 2988 } 2989 2990 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 2991 { 2992 return kvm_s390_vcpu_has_irq(vcpu, 0); 2993 } 2994 2995 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 2996 { 2997 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE); 2998 } 2999 3000 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 3001 { 3002 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3003 exit_sie(vcpu); 3004 } 3005 3006 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 3007 { 3008 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3009 } 3010 3011 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 3012 { 3013 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3014 exit_sie(vcpu); 3015 } 3016 3017 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu) 3018 { 3019 return atomic_read(&vcpu->arch.sie_block->prog20) & 3020 (PROG_BLOCK_SIE | PROG_REQUEST); 3021 } 3022 3023 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 3024 { 3025 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3026 } 3027 3028 /* 3029 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running. 3030 * If the CPU is not running (e.g. waiting as idle) the function will 3031 * return immediately. */ 3032 void exit_sie(struct kvm_vcpu *vcpu) 3033 { 3034 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT); 3035 kvm_s390_vsie_kick(vcpu); 3036 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 3037 cpu_relax(); 3038 } 3039 3040 /* Kick a guest cpu out of SIE to process a request synchronously */ 3041 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 3042 { 3043 kvm_make_request(req, vcpu); 3044 kvm_s390_vcpu_request(vcpu); 3045 } 3046 3047 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 3048 unsigned long end) 3049 { 3050 struct kvm *kvm = gmap->private; 3051 struct kvm_vcpu *vcpu; 3052 unsigned long prefix; 3053 int i; 3054 3055 if (gmap_is_shadow(gmap)) 3056 return; 3057 if (start >= 1UL << 31) 3058 /* We are only interested in prefix pages */ 3059 return; 3060 kvm_for_each_vcpu(i, vcpu, kvm) { 3061 /* match against both prefix pages */ 3062 prefix = kvm_s390_get_prefix(vcpu); 3063 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) { 3064 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx", 3065 start, end); 3066 kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu); 3067 } 3068 } 3069 } 3070 3071 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 3072 { 3073 /* kvm common code refers to this, but never calls it */ 3074 BUG(); 3075 return 0; 3076 } 3077 3078 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 3079 struct kvm_one_reg *reg) 3080 { 3081 int r = -EINVAL; 3082 3083 switch (reg->id) { 3084 case KVM_REG_S390_TODPR: 3085 r = put_user(vcpu->arch.sie_block->todpr, 3086 (u32 __user *)reg->addr); 3087 break; 3088 case KVM_REG_S390_EPOCHDIFF: 3089 r = put_user(vcpu->arch.sie_block->epoch, 3090 (u64 __user *)reg->addr); 3091 break; 3092 case KVM_REG_S390_CPU_TIMER: 3093 r = put_user(kvm_s390_get_cpu_timer(vcpu), 3094 (u64 __user *)reg->addr); 3095 break; 3096 case KVM_REG_S390_CLOCK_COMP: 3097 r = put_user(vcpu->arch.sie_block->ckc, 3098 (u64 __user *)reg->addr); 3099 break; 3100 case KVM_REG_S390_PFTOKEN: 3101 r = put_user(vcpu->arch.pfault_token, 3102 (u64 __user *)reg->addr); 3103 break; 3104 case KVM_REG_S390_PFCOMPARE: 3105 r = put_user(vcpu->arch.pfault_compare, 3106 (u64 __user *)reg->addr); 3107 break; 3108 case KVM_REG_S390_PFSELECT: 3109 r = put_user(vcpu->arch.pfault_select, 3110 (u64 __user *)reg->addr); 3111 break; 3112 case KVM_REG_S390_PP: 3113 r = put_user(vcpu->arch.sie_block->pp, 3114 (u64 __user *)reg->addr); 3115 break; 3116 case KVM_REG_S390_GBEA: 3117 r = put_user(vcpu->arch.sie_block->gbea, 3118 (u64 __user *)reg->addr); 3119 break; 3120 default: 3121 break; 3122 } 3123 3124 return r; 3125 } 3126 3127 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 3128 struct kvm_one_reg *reg) 3129 { 3130 int r = -EINVAL; 3131 __u64 val; 3132 3133 switch (reg->id) { 3134 case KVM_REG_S390_TODPR: 3135 r = get_user(vcpu->arch.sie_block->todpr, 3136 (u32 __user *)reg->addr); 3137 break; 3138 case KVM_REG_S390_EPOCHDIFF: 3139 r = get_user(vcpu->arch.sie_block->epoch, 3140 (u64 __user *)reg->addr); 3141 break; 3142 case KVM_REG_S390_CPU_TIMER: 3143 r = get_user(val, (u64 __user *)reg->addr); 3144 if (!r) 3145 kvm_s390_set_cpu_timer(vcpu, val); 3146 break; 3147 case KVM_REG_S390_CLOCK_COMP: 3148 r = get_user(vcpu->arch.sie_block->ckc, 3149 (u64 __user *)reg->addr); 3150 break; 3151 case KVM_REG_S390_PFTOKEN: 3152 r = get_user(vcpu->arch.pfault_token, 3153 (u64 __user *)reg->addr); 3154 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3155 kvm_clear_async_pf_completion_queue(vcpu); 3156 break; 3157 case KVM_REG_S390_PFCOMPARE: 3158 r = get_user(vcpu->arch.pfault_compare, 3159 (u64 __user *)reg->addr); 3160 break; 3161 case KVM_REG_S390_PFSELECT: 3162 r = get_user(vcpu->arch.pfault_select, 3163 (u64 __user *)reg->addr); 3164 break; 3165 case KVM_REG_S390_PP: 3166 r = get_user(vcpu->arch.sie_block->pp, 3167 (u64 __user *)reg->addr); 3168 break; 3169 case KVM_REG_S390_GBEA: 3170 r = get_user(vcpu->arch.sie_block->gbea, 3171 (u64 __user *)reg->addr); 3172 break; 3173 default: 3174 break; 3175 } 3176 3177 return r; 3178 } 3179 3180 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 3181 { 3182 kvm_s390_vcpu_initial_reset(vcpu); 3183 return 0; 3184 } 3185 3186 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 3187 { 3188 vcpu_load(vcpu); 3189 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 3190 vcpu_put(vcpu); 3191 return 0; 3192 } 3193 3194 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 3195 { 3196 vcpu_load(vcpu); 3197 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 3198 vcpu_put(vcpu); 3199 return 0; 3200 } 3201 3202 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 3203 struct kvm_sregs *sregs) 3204 { 3205 vcpu_load(vcpu); 3206 3207 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 3208 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 3209 3210 vcpu_put(vcpu); 3211 return 0; 3212 } 3213 3214 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 3215 struct kvm_sregs *sregs) 3216 { 3217 vcpu_load(vcpu); 3218 3219 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 3220 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 3221 3222 vcpu_put(vcpu); 3223 return 0; 3224 } 3225 3226 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 3227 { 3228 int ret = 0; 3229 3230 vcpu_load(vcpu); 3231 3232 if (test_fp_ctl(fpu->fpc)) { 3233 ret = -EINVAL; 3234 goto out; 3235 } 3236 vcpu->run->s.regs.fpc = fpu->fpc; 3237 if (MACHINE_HAS_VX) 3238 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs, 3239 (freg_t *) fpu->fprs); 3240 else 3241 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs)); 3242 3243 out: 3244 vcpu_put(vcpu); 3245 return ret; 3246 } 3247 3248 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 3249 { 3250 vcpu_load(vcpu); 3251 3252 /* make sure we have the latest values */ 3253 save_fpu_regs(); 3254 if (MACHINE_HAS_VX) 3255 convert_vx_to_fp((freg_t *) fpu->fprs, 3256 (__vector128 *) vcpu->run->s.regs.vrs); 3257 else 3258 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs)); 3259 fpu->fpc = vcpu->run->s.regs.fpc; 3260 3261 vcpu_put(vcpu); 3262 return 0; 3263 } 3264 3265 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 3266 { 3267 int rc = 0; 3268 3269 if (!is_vcpu_stopped(vcpu)) 3270 rc = -EBUSY; 3271 else { 3272 vcpu->run->psw_mask = psw.mask; 3273 vcpu->run->psw_addr = psw.addr; 3274 } 3275 return rc; 3276 } 3277 3278 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 3279 struct kvm_translation *tr) 3280 { 3281 return -EINVAL; /* not implemented yet */ 3282 } 3283 3284 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 3285 KVM_GUESTDBG_USE_HW_BP | \ 3286 KVM_GUESTDBG_ENABLE) 3287 3288 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 3289 struct kvm_guest_debug *dbg) 3290 { 3291 int rc = 0; 3292 3293 vcpu_load(vcpu); 3294 3295 vcpu->guest_debug = 0; 3296 kvm_s390_clear_bp_data(vcpu); 3297 3298 if (dbg->control & ~VALID_GUESTDBG_FLAGS) { 3299 rc = -EINVAL; 3300 goto out; 3301 } 3302 if (!sclp.has_gpere) { 3303 rc = -EINVAL; 3304 goto out; 3305 } 3306 3307 if (dbg->control & KVM_GUESTDBG_ENABLE) { 3308 vcpu->guest_debug = dbg->control; 3309 /* enforce guest PER */ 3310 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P); 3311 3312 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) 3313 rc = kvm_s390_import_bp_data(vcpu, dbg); 3314 } else { 3315 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 3316 vcpu->arch.guestdbg.last_bp = 0; 3317 } 3318 3319 if (rc) { 3320 vcpu->guest_debug = 0; 3321 kvm_s390_clear_bp_data(vcpu); 3322 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 3323 } 3324 3325 out: 3326 vcpu_put(vcpu); 3327 return rc; 3328 } 3329 3330 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 3331 struct kvm_mp_state *mp_state) 3332 { 3333 int ret; 3334 3335 vcpu_load(vcpu); 3336 3337 /* CHECK_STOP and LOAD are not supported yet */ 3338 ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 3339 KVM_MP_STATE_OPERATING; 3340 3341 vcpu_put(vcpu); 3342 return ret; 3343 } 3344 3345 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 3346 struct kvm_mp_state *mp_state) 3347 { 3348 int rc = 0; 3349 3350 vcpu_load(vcpu); 3351 3352 /* user space knows about this interface - let it control the state */ 3353 vcpu->kvm->arch.user_cpu_state_ctrl = 1; 3354 3355 switch (mp_state->mp_state) { 3356 case KVM_MP_STATE_STOPPED: 3357 kvm_s390_vcpu_stop(vcpu); 3358 break; 3359 case KVM_MP_STATE_OPERATING: 3360 kvm_s390_vcpu_start(vcpu); 3361 break; 3362 case KVM_MP_STATE_LOAD: 3363 case KVM_MP_STATE_CHECK_STOP: 3364 /* fall through - CHECK_STOP and LOAD are not supported yet */ 3365 default: 3366 rc = -ENXIO; 3367 } 3368 3369 vcpu_put(vcpu); 3370 return rc; 3371 } 3372 3373 static bool ibs_enabled(struct kvm_vcpu *vcpu) 3374 { 3375 return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS); 3376 } 3377 3378 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 3379 { 3380 retry: 3381 kvm_s390_vcpu_request_handled(vcpu); 3382 if (!kvm_request_pending(vcpu)) 3383 return 0; 3384 /* 3385 * We use MMU_RELOAD just to re-arm the ipte notifier for the 3386 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. 3387 * This ensures that the ipte instruction for this request has 3388 * already finished. We might race against a second unmapper that 3389 * wants to set the blocking bit. Lets just retry the request loop. 3390 */ 3391 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) { 3392 int rc; 3393 rc = gmap_mprotect_notify(vcpu->arch.gmap, 3394 kvm_s390_get_prefix(vcpu), 3395 PAGE_SIZE * 2, PROT_WRITE); 3396 if (rc) { 3397 kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu); 3398 return rc; 3399 } 3400 goto retry; 3401 } 3402 3403 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 3404 vcpu->arch.sie_block->ihcpu = 0xffff; 3405 goto retry; 3406 } 3407 3408 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 3409 if (!ibs_enabled(vcpu)) { 3410 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 3411 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS); 3412 } 3413 goto retry; 3414 } 3415 3416 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 3417 if (ibs_enabled(vcpu)) { 3418 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 3419 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS); 3420 } 3421 goto retry; 3422 } 3423 3424 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { 3425 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 3426 goto retry; 3427 } 3428 3429 if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) { 3430 /* 3431 * Disable CMM virtualization; we will emulate the ESSA 3432 * instruction manually, in order to provide additional 3433 * functionalities needed for live migration. 3434 */ 3435 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA; 3436 goto retry; 3437 } 3438 3439 if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) { 3440 /* 3441 * Re-enable CMM virtualization if CMMA is available and 3442 * CMM has been used. 3443 */ 3444 if ((vcpu->kvm->arch.use_cmma) && 3445 (vcpu->kvm->mm->context.uses_cmm)) 3446 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 3447 goto retry; 3448 } 3449 3450 /* nothing to do, just clear the request */ 3451 kvm_clear_request(KVM_REQ_UNHALT, vcpu); 3452 /* we left the vsie handler, nothing to do, just clear the request */ 3453 kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); 3454 3455 return 0; 3456 } 3457 3458 void kvm_s390_set_tod_clock(struct kvm *kvm, 3459 const struct kvm_s390_vm_tod_clock *gtod) 3460 { 3461 struct kvm_vcpu *vcpu; 3462 struct kvm_s390_tod_clock_ext htod; 3463 int i; 3464 3465 mutex_lock(&kvm->lock); 3466 preempt_disable(); 3467 3468 get_tod_clock_ext((char *)&htod); 3469 3470 kvm->arch.epoch = gtod->tod - htod.tod; 3471 kvm->arch.epdx = 0; 3472 if (test_kvm_facility(kvm, 139)) { 3473 kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx; 3474 if (kvm->arch.epoch > gtod->tod) 3475 kvm->arch.epdx -= 1; 3476 } 3477 3478 kvm_s390_vcpu_block_all(kvm); 3479 kvm_for_each_vcpu(i, vcpu, kvm) { 3480 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 3481 vcpu->arch.sie_block->epdx = kvm->arch.epdx; 3482 } 3483 3484 kvm_s390_vcpu_unblock_all(kvm); 3485 preempt_enable(); 3486 mutex_unlock(&kvm->lock); 3487 } 3488 3489 /** 3490 * kvm_arch_fault_in_page - fault-in guest page if necessary 3491 * @vcpu: The corresponding virtual cpu 3492 * @gpa: Guest physical address 3493 * @writable: Whether the page should be writable or not 3494 * 3495 * Make sure that a guest page has been faulted-in on the host. 3496 * 3497 * Return: Zero on success, negative error code otherwise. 3498 */ 3499 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable) 3500 { 3501 return gmap_fault(vcpu->arch.gmap, gpa, 3502 writable ? FAULT_FLAG_WRITE : 0); 3503 } 3504 3505 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 3506 unsigned long token) 3507 { 3508 struct kvm_s390_interrupt inti; 3509 struct kvm_s390_irq irq; 3510 3511 if (start_token) { 3512 irq.u.ext.ext_params2 = token; 3513 irq.type = KVM_S390_INT_PFAULT_INIT; 3514 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 3515 } else { 3516 inti.type = KVM_S390_INT_PFAULT_DONE; 3517 inti.parm64 = token; 3518 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); 3519 } 3520 } 3521 3522 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 3523 struct kvm_async_pf *work) 3524 { 3525 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 3526 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 3527 } 3528 3529 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 3530 struct kvm_async_pf *work) 3531 { 3532 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 3533 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 3534 } 3535 3536 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 3537 struct kvm_async_pf *work) 3538 { 3539 /* s390 will always inject the page directly */ 3540 } 3541 3542 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 3543 { 3544 /* 3545 * s390 will always inject the page directly, 3546 * but we still want check_async_completion to cleanup 3547 */ 3548 return true; 3549 } 3550 3551 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 3552 { 3553 hva_t hva; 3554 struct kvm_arch_async_pf arch; 3555 int rc; 3556 3557 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3558 return 0; 3559 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 3560 vcpu->arch.pfault_compare) 3561 return 0; 3562 if (psw_extint_disabled(vcpu)) 3563 return 0; 3564 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 3565 return 0; 3566 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) 3567 return 0; 3568 if (!vcpu->arch.gmap->pfault_enabled) 3569 return 0; 3570 3571 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); 3572 hva += current->thread.gmap_addr & ~PAGE_MASK; 3573 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 3574 return 0; 3575 3576 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); 3577 return rc; 3578 } 3579 3580 static int vcpu_pre_run(struct kvm_vcpu *vcpu) 3581 { 3582 int rc, cpuflags; 3583 3584 /* 3585 * On s390 notifications for arriving pages will be delivered directly 3586 * to the guest but the house keeping for completed pfaults is 3587 * handled outside the worker. 3588 */ 3589 kvm_check_async_pf_completion(vcpu); 3590 3591 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; 3592 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; 3593 3594 if (need_resched()) 3595 schedule(); 3596 3597 if (test_cpu_flag(CIF_MCCK_PENDING)) 3598 s390_handle_mcck(); 3599 3600 if (!kvm_is_ucontrol(vcpu->kvm)) { 3601 rc = kvm_s390_deliver_pending_interrupts(vcpu); 3602 if (rc) 3603 return rc; 3604 } 3605 3606 rc = kvm_s390_handle_requests(vcpu); 3607 if (rc) 3608 return rc; 3609 3610 if (guestdbg_enabled(vcpu)) { 3611 kvm_s390_backup_guest_per_regs(vcpu); 3612 kvm_s390_patch_guest_per_regs(vcpu); 3613 } 3614 3615 clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask); 3616 3617 vcpu->arch.sie_block->icptcode = 0; 3618 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 3619 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 3620 trace_kvm_s390_sie_enter(vcpu, cpuflags); 3621 3622 return 0; 3623 } 3624 3625 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu) 3626 { 3627 struct kvm_s390_pgm_info pgm_info = { 3628 .code = PGM_ADDRESSING, 3629 }; 3630 u8 opcode, ilen; 3631 int rc; 3632 3633 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 3634 trace_kvm_s390_sie_fault(vcpu); 3635 3636 /* 3637 * We want to inject an addressing exception, which is defined as a 3638 * suppressing or terminating exception. However, since we came here 3639 * by a DAT access exception, the PSW still points to the faulting 3640 * instruction since DAT exceptions are nullifying. So we've got 3641 * to look up the current opcode to get the length of the instruction 3642 * to be able to forward the PSW. 3643 */ 3644 rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1); 3645 ilen = insn_length(opcode); 3646 if (rc < 0) { 3647 return rc; 3648 } else if (rc) { 3649 /* Instruction-Fetching Exceptions - we can't detect the ilen. 3650 * Forward by arbitrary ilc, injection will take care of 3651 * nullification if necessary. 3652 */ 3653 pgm_info = vcpu->arch.pgm; 3654 ilen = 4; 3655 } 3656 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; 3657 kvm_s390_forward_psw(vcpu, ilen); 3658 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 3659 } 3660 3661 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) 3662 { 3663 struct mcck_volatile_info *mcck_info; 3664 struct sie_page *sie_page; 3665 3666 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 3667 vcpu->arch.sie_block->icptcode); 3668 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 3669 3670 if (guestdbg_enabled(vcpu)) 3671 kvm_s390_restore_guest_per_regs(vcpu); 3672 3673 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; 3674 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; 3675 3676 if (exit_reason == -EINTR) { 3677 VCPU_EVENT(vcpu, 3, "%s", "machine check"); 3678 sie_page = container_of(vcpu->arch.sie_block, 3679 struct sie_page, sie_block); 3680 mcck_info = &sie_page->mcck_info; 3681 kvm_s390_reinject_machine_check(vcpu, mcck_info); 3682 return 0; 3683 } 3684 3685 if (vcpu->arch.sie_block->icptcode > 0) { 3686 int rc = kvm_handle_sie_intercept(vcpu); 3687 3688 if (rc != -EOPNOTSUPP) 3689 return rc; 3690 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; 3691 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 3692 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 3693 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 3694 return -EREMOTE; 3695 } else if (exit_reason != -EFAULT) { 3696 vcpu->stat.exit_null++; 3697 return 0; 3698 } else if (kvm_is_ucontrol(vcpu->kvm)) { 3699 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 3700 vcpu->run->s390_ucontrol.trans_exc_code = 3701 current->thread.gmap_addr; 3702 vcpu->run->s390_ucontrol.pgm_code = 0x10; 3703 return -EREMOTE; 3704 } else if (current->thread.gmap_pfault) { 3705 trace_kvm_s390_major_guest_pfault(vcpu); 3706 current->thread.gmap_pfault = 0; 3707 if (kvm_arch_setup_async_pf(vcpu)) 3708 return 0; 3709 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1); 3710 } 3711 return vcpu_post_run_fault_in_sie(vcpu); 3712 } 3713 3714 static int __vcpu_run(struct kvm_vcpu *vcpu) 3715 { 3716 int rc, exit_reason; 3717 3718 /* 3719 * We try to hold kvm->srcu during most of vcpu_run (except when run- 3720 * ning the guest), so that memslots (and other stuff) are protected 3721 */ 3722 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 3723 3724 do { 3725 rc = vcpu_pre_run(vcpu); 3726 if (rc) 3727 break; 3728 3729 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 3730 /* 3731 * As PF_VCPU will be used in fault handler, between 3732 * guest_enter and guest_exit should be no uaccess. 3733 */ 3734 local_irq_disable(); 3735 guest_enter_irqoff(); 3736 __disable_cpu_timer_accounting(vcpu); 3737 local_irq_enable(); 3738 exit_reason = sie64a(vcpu->arch.sie_block, 3739 vcpu->run->s.regs.gprs); 3740 local_irq_disable(); 3741 __enable_cpu_timer_accounting(vcpu); 3742 guest_exit_irqoff(); 3743 local_irq_enable(); 3744 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 3745 3746 rc = vcpu_post_run(vcpu, exit_reason); 3747 } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); 3748 3749 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 3750 return rc; 3751 } 3752 3753 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 3754 { 3755 struct runtime_instr_cb *riccb; 3756 struct gs_cb *gscb; 3757 3758 riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb; 3759 gscb = (struct gs_cb *) &kvm_run->s.regs.gscb; 3760 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 3761 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 3762 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 3763 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 3764 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 3765 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 3766 /* some control register changes require a tlb flush */ 3767 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 3768 } 3769 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 3770 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); 3771 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 3772 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 3773 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 3774 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 3775 } 3776 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 3777 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 3778 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 3779 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 3780 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3781 kvm_clear_async_pf_completion_queue(vcpu); 3782 } 3783 /* 3784 * If userspace sets the riccb (e.g. after migration) to a valid state, 3785 * we should enable RI here instead of doing the lazy enablement. 3786 */ 3787 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) && 3788 test_kvm_facility(vcpu->kvm, 64) && 3789 riccb->v && 3790 !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) { 3791 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)"); 3792 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 3793 } 3794 /* 3795 * If userspace sets the gscb (e.g. after migration) to non-zero, 3796 * we should enable GS here instead of doing the lazy enablement. 3797 */ 3798 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) && 3799 test_kvm_facility(vcpu->kvm, 133) && 3800 gscb->gssm && 3801 !vcpu->arch.gs_enabled) { 3802 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)"); 3803 vcpu->arch.sie_block->ecb |= ECB_GS; 3804 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 3805 vcpu->arch.gs_enabled = 1; 3806 } 3807 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) && 3808 test_kvm_facility(vcpu->kvm, 82)) { 3809 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 3810 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0; 3811 } 3812 save_access_regs(vcpu->arch.host_acrs); 3813 restore_access_regs(vcpu->run->s.regs.acrs); 3814 /* save host (userspace) fprs/vrs */ 3815 save_fpu_regs(); 3816 vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc; 3817 vcpu->arch.host_fpregs.regs = current->thread.fpu.regs; 3818 if (MACHINE_HAS_VX) 3819 current->thread.fpu.regs = vcpu->run->s.regs.vrs; 3820 else 3821 current->thread.fpu.regs = vcpu->run->s.regs.fprs; 3822 current->thread.fpu.fpc = vcpu->run->s.regs.fpc; 3823 if (test_fp_ctl(current->thread.fpu.fpc)) 3824 /* User space provided an invalid FPC, let's clear it */ 3825 current->thread.fpu.fpc = 0; 3826 if (MACHINE_HAS_GS) { 3827 preempt_disable(); 3828 __ctl_set_bit(2, 4); 3829 if (current->thread.gs_cb) { 3830 vcpu->arch.host_gscb = current->thread.gs_cb; 3831 save_gs_cb(vcpu->arch.host_gscb); 3832 } 3833 if (vcpu->arch.gs_enabled) { 3834 current->thread.gs_cb = (struct gs_cb *) 3835 &vcpu->run->s.regs.gscb; 3836 restore_gs_cb(current->thread.gs_cb); 3837 } 3838 preempt_enable(); 3839 } 3840 /* SIE will load etoken directly from SDNX and therefore kvm_run */ 3841 3842 kvm_run->kvm_dirty_regs = 0; 3843 } 3844 3845 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 3846 { 3847 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 3848 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 3849 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 3850 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 3851 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); 3852 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 3853 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 3854 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 3855 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 3856 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 3857 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 3858 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 3859 kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; 3860 save_access_regs(vcpu->run->s.regs.acrs); 3861 restore_access_regs(vcpu->arch.host_acrs); 3862 /* Save guest register state */ 3863 save_fpu_regs(); 3864 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 3865 /* Restore will be done lazily at return */ 3866 current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc; 3867 current->thread.fpu.regs = vcpu->arch.host_fpregs.regs; 3868 if (MACHINE_HAS_GS) { 3869 __ctl_set_bit(2, 4); 3870 if (vcpu->arch.gs_enabled) 3871 save_gs_cb(current->thread.gs_cb); 3872 preempt_disable(); 3873 current->thread.gs_cb = vcpu->arch.host_gscb; 3874 restore_gs_cb(vcpu->arch.host_gscb); 3875 preempt_enable(); 3876 if (!vcpu->arch.host_gscb) 3877 __ctl_clear_bit(2, 4); 3878 vcpu->arch.host_gscb = NULL; 3879 } 3880 /* SIE will save etoken directly into SDNX and therefore kvm_run */ 3881 } 3882 3883 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 3884 { 3885 int rc; 3886 3887 if (kvm_run->immediate_exit) 3888 return -EINTR; 3889 3890 vcpu_load(vcpu); 3891 3892 if (guestdbg_exit_pending(vcpu)) { 3893 kvm_s390_prepare_debug_exit(vcpu); 3894 rc = 0; 3895 goto out; 3896 } 3897 3898 kvm_sigset_activate(vcpu); 3899 3900 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 3901 kvm_s390_vcpu_start(vcpu); 3902 } else if (is_vcpu_stopped(vcpu)) { 3903 pr_err_ratelimited("can't run stopped vcpu %d\n", 3904 vcpu->vcpu_id); 3905 rc = -EINVAL; 3906 goto out; 3907 } 3908 3909 sync_regs(vcpu, kvm_run); 3910 enable_cpu_timer_accounting(vcpu); 3911 3912 might_fault(); 3913 rc = __vcpu_run(vcpu); 3914 3915 if (signal_pending(current) && !rc) { 3916 kvm_run->exit_reason = KVM_EXIT_INTR; 3917 rc = -EINTR; 3918 } 3919 3920 if (guestdbg_exit_pending(vcpu) && !rc) { 3921 kvm_s390_prepare_debug_exit(vcpu); 3922 rc = 0; 3923 } 3924 3925 if (rc == -EREMOTE) { 3926 /* userspace support is needed, kvm_run has been prepared */ 3927 rc = 0; 3928 } 3929 3930 disable_cpu_timer_accounting(vcpu); 3931 store_regs(vcpu, kvm_run); 3932 3933 kvm_sigset_deactivate(vcpu); 3934 3935 vcpu->stat.exit_userspace++; 3936 out: 3937 vcpu_put(vcpu); 3938 return rc; 3939 } 3940 3941 /* 3942 * store status at address 3943 * we use have two special cases: 3944 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 3945 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 3946 */ 3947 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 3948 { 3949 unsigned char archmode = 1; 3950 freg_t fprs[NUM_FPRS]; 3951 unsigned int px; 3952 u64 clkcomp, cputm; 3953 int rc; 3954 3955 px = kvm_s390_get_prefix(vcpu); 3956 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 3957 if (write_guest_abs(vcpu, 163, &archmode, 1)) 3958 return -EFAULT; 3959 gpa = 0; 3960 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 3961 if (write_guest_real(vcpu, 163, &archmode, 1)) 3962 return -EFAULT; 3963 gpa = px; 3964 } else 3965 gpa -= __LC_FPREGS_SAVE_AREA; 3966 3967 /* manually convert vector registers if necessary */ 3968 if (MACHINE_HAS_VX) { 3969 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 3970 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 3971 fprs, 128); 3972 } else { 3973 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 3974 vcpu->run->s.regs.fprs, 128); 3975 } 3976 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 3977 vcpu->run->s.regs.gprs, 128); 3978 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 3979 &vcpu->arch.sie_block->gpsw, 16); 3980 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 3981 &px, 4); 3982 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 3983 &vcpu->run->s.regs.fpc, 4); 3984 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 3985 &vcpu->arch.sie_block->todpr, 4); 3986 cputm = kvm_s390_get_cpu_timer(vcpu); 3987 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 3988 &cputm, 8); 3989 clkcomp = vcpu->arch.sie_block->ckc >> 8; 3990 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 3991 &clkcomp, 8); 3992 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 3993 &vcpu->run->s.regs.acrs, 64); 3994 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 3995 &vcpu->arch.sie_block->gcr, 128); 3996 return rc ? -EFAULT : 0; 3997 } 3998 3999 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 4000 { 4001 /* 4002 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 4003 * switch in the run ioctl. Let's update our copies before we save 4004 * it into the save area 4005 */ 4006 save_fpu_regs(); 4007 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 4008 save_access_regs(vcpu->run->s.regs.acrs); 4009 4010 return kvm_s390_store_status_unloaded(vcpu, addr); 4011 } 4012 4013 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 4014 { 4015 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 4016 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 4017 } 4018 4019 static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 4020 { 4021 unsigned int i; 4022 struct kvm_vcpu *vcpu; 4023 4024 kvm_for_each_vcpu(i, vcpu, kvm) { 4025 __disable_ibs_on_vcpu(vcpu); 4026 } 4027 } 4028 4029 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 4030 { 4031 if (!sclp.has_ibs) 4032 return; 4033 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 4034 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 4035 } 4036 4037 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 4038 { 4039 int i, online_vcpus, started_vcpus = 0; 4040 4041 if (!is_vcpu_stopped(vcpu)) 4042 return; 4043 4044 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 4045 /* Only one cpu at a time may enter/leave the STOPPED state. */ 4046 spin_lock(&vcpu->kvm->arch.start_stop_lock); 4047 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 4048 4049 for (i = 0; i < online_vcpus; i++) { 4050 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) 4051 started_vcpus++; 4052 } 4053 4054 if (started_vcpus == 0) { 4055 /* we're the only active VCPU -> speed it up */ 4056 __enable_ibs_on_vcpu(vcpu); 4057 } else if (started_vcpus == 1) { 4058 /* 4059 * As we are starting a second VCPU, we have to disable 4060 * the IBS facility on all VCPUs to remove potentially 4061 * oustanding ENABLE requests. 4062 */ 4063 __disable_ibs_on_all_vcpus(vcpu->kvm); 4064 } 4065 4066 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED); 4067 /* 4068 * Another VCPU might have used IBS while we were offline. 4069 * Let's play safe and flush the VCPU at startup. 4070 */ 4071 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 4072 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 4073 return; 4074 } 4075 4076 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 4077 { 4078 int i, online_vcpus, started_vcpus = 0; 4079 struct kvm_vcpu *started_vcpu = NULL; 4080 4081 if (is_vcpu_stopped(vcpu)) 4082 return; 4083 4084 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 4085 /* Only one cpu at a time may enter/leave the STOPPED state. */ 4086 spin_lock(&vcpu->kvm->arch.start_stop_lock); 4087 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 4088 4089 /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */ 4090 kvm_s390_clear_stop_irq(vcpu); 4091 4092 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED); 4093 __disable_ibs_on_vcpu(vcpu); 4094 4095 for (i = 0; i < online_vcpus; i++) { 4096 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) { 4097 started_vcpus++; 4098 started_vcpu = vcpu->kvm->vcpus[i]; 4099 } 4100 } 4101 4102 if (started_vcpus == 1) { 4103 /* 4104 * As we only have one VCPU left, we want to enable the 4105 * IBS facility for that VCPU to speed it up. 4106 */ 4107 __enable_ibs_on_vcpu(started_vcpu); 4108 } 4109 4110 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 4111 return; 4112 } 4113 4114 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 4115 struct kvm_enable_cap *cap) 4116 { 4117 int r; 4118 4119 if (cap->flags) 4120 return -EINVAL; 4121 4122 switch (cap->cap) { 4123 case KVM_CAP_S390_CSS_SUPPORT: 4124 if (!vcpu->kvm->arch.css_support) { 4125 vcpu->kvm->arch.css_support = 1; 4126 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 4127 trace_kvm_s390_enable_css(vcpu->kvm); 4128 } 4129 r = 0; 4130 break; 4131 default: 4132 r = -EINVAL; 4133 break; 4134 } 4135 return r; 4136 } 4137 4138 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu, 4139 struct kvm_s390_mem_op *mop) 4140 { 4141 void __user *uaddr = (void __user *)mop->buf; 4142 void *tmpbuf = NULL; 4143 int r, srcu_idx; 4144 const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION 4145 | KVM_S390_MEMOP_F_CHECK_ONLY; 4146 4147 if (mop->flags & ~supported_flags) 4148 return -EINVAL; 4149 4150 if (mop->size > MEM_OP_MAX_SIZE) 4151 return -E2BIG; 4152 4153 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 4154 tmpbuf = vmalloc(mop->size); 4155 if (!tmpbuf) 4156 return -ENOMEM; 4157 } 4158 4159 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 4160 4161 switch (mop->op) { 4162 case KVM_S390_MEMOP_LOGICAL_READ: 4163 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 4164 r = check_gva_range(vcpu, mop->gaddr, mop->ar, 4165 mop->size, GACC_FETCH); 4166 break; 4167 } 4168 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 4169 if (r == 0) { 4170 if (copy_to_user(uaddr, tmpbuf, mop->size)) 4171 r = -EFAULT; 4172 } 4173 break; 4174 case KVM_S390_MEMOP_LOGICAL_WRITE: 4175 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 4176 r = check_gva_range(vcpu, mop->gaddr, mop->ar, 4177 mop->size, GACC_STORE); 4178 break; 4179 } 4180 if (copy_from_user(tmpbuf, uaddr, mop->size)) { 4181 r = -EFAULT; 4182 break; 4183 } 4184 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 4185 break; 4186 default: 4187 r = -EINVAL; 4188 } 4189 4190 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 4191 4192 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 4193 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 4194 4195 vfree(tmpbuf); 4196 return r; 4197 } 4198 4199 long kvm_arch_vcpu_async_ioctl(struct file *filp, 4200 unsigned int ioctl, unsigned long arg) 4201 { 4202 struct kvm_vcpu *vcpu = filp->private_data; 4203 void __user *argp = (void __user *)arg; 4204 4205 switch (ioctl) { 4206 case KVM_S390_IRQ: { 4207 struct kvm_s390_irq s390irq; 4208 4209 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 4210 return -EFAULT; 4211 return kvm_s390_inject_vcpu(vcpu, &s390irq); 4212 } 4213 case KVM_S390_INTERRUPT: { 4214 struct kvm_s390_interrupt s390int; 4215 struct kvm_s390_irq s390irq; 4216 4217 if (copy_from_user(&s390int, argp, sizeof(s390int))) 4218 return -EFAULT; 4219 if (s390int_to_s390irq(&s390int, &s390irq)) 4220 return -EINVAL; 4221 return kvm_s390_inject_vcpu(vcpu, &s390irq); 4222 } 4223 } 4224 return -ENOIOCTLCMD; 4225 } 4226 4227 long kvm_arch_vcpu_ioctl(struct file *filp, 4228 unsigned int ioctl, unsigned long arg) 4229 { 4230 struct kvm_vcpu *vcpu = filp->private_data; 4231 void __user *argp = (void __user *)arg; 4232 int idx; 4233 long r; 4234 4235 vcpu_load(vcpu); 4236 4237 switch (ioctl) { 4238 case KVM_S390_STORE_STATUS: 4239 idx = srcu_read_lock(&vcpu->kvm->srcu); 4240 r = kvm_s390_vcpu_store_status(vcpu, arg); 4241 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4242 break; 4243 case KVM_S390_SET_INITIAL_PSW: { 4244 psw_t psw; 4245 4246 r = -EFAULT; 4247 if (copy_from_user(&psw, argp, sizeof(psw))) 4248 break; 4249 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 4250 break; 4251 } 4252 case KVM_S390_INITIAL_RESET: 4253 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); 4254 break; 4255 case KVM_SET_ONE_REG: 4256 case KVM_GET_ONE_REG: { 4257 struct kvm_one_reg reg; 4258 r = -EFAULT; 4259 if (copy_from_user(®, argp, sizeof(reg))) 4260 break; 4261 if (ioctl == KVM_SET_ONE_REG) 4262 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 4263 else 4264 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 4265 break; 4266 } 4267 #ifdef CONFIG_KVM_S390_UCONTROL 4268 case KVM_S390_UCAS_MAP: { 4269 struct kvm_s390_ucas_mapping ucasmap; 4270 4271 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 4272 r = -EFAULT; 4273 break; 4274 } 4275 4276 if (!kvm_is_ucontrol(vcpu->kvm)) { 4277 r = -EINVAL; 4278 break; 4279 } 4280 4281 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, 4282 ucasmap.vcpu_addr, ucasmap.length); 4283 break; 4284 } 4285 case KVM_S390_UCAS_UNMAP: { 4286 struct kvm_s390_ucas_mapping ucasmap; 4287 4288 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 4289 r = -EFAULT; 4290 break; 4291 } 4292 4293 if (!kvm_is_ucontrol(vcpu->kvm)) { 4294 r = -EINVAL; 4295 break; 4296 } 4297 4298 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, 4299 ucasmap.length); 4300 break; 4301 } 4302 #endif 4303 case KVM_S390_VCPU_FAULT: { 4304 r = gmap_fault(vcpu->arch.gmap, arg, 0); 4305 break; 4306 } 4307 case KVM_ENABLE_CAP: 4308 { 4309 struct kvm_enable_cap cap; 4310 r = -EFAULT; 4311 if (copy_from_user(&cap, argp, sizeof(cap))) 4312 break; 4313 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 4314 break; 4315 } 4316 case KVM_S390_MEM_OP: { 4317 struct kvm_s390_mem_op mem_op; 4318 4319 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 4320 r = kvm_s390_guest_mem_op(vcpu, &mem_op); 4321 else 4322 r = -EFAULT; 4323 break; 4324 } 4325 case KVM_S390_SET_IRQ_STATE: { 4326 struct kvm_s390_irq_state irq_state; 4327 4328 r = -EFAULT; 4329 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 4330 break; 4331 if (irq_state.len > VCPU_IRQS_MAX_BUF || 4332 irq_state.len == 0 || 4333 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 4334 r = -EINVAL; 4335 break; 4336 } 4337 /* do not use irq_state.flags, it will break old QEMUs */ 4338 r = kvm_s390_set_irq_state(vcpu, 4339 (void __user *) irq_state.buf, 4340 irq_state.len); 4341 break; 4342 } 4343 case KVM_S390_GET_IRQ_STATE: { 4344 struct kvm_s390_irq_state irq_state; 4345 4346 r = -EFAULT; 4347 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 4348 break; 4349 if (irq_state.len == 0) { 4350 r = -EINVAL; 4351 break; 4352 } 4353 /* do not use irq_state.flags, it will break old QEMUs */ 4354 r = kvm_s390_get_irq_state(vcpu, 4355 (__u8 __user *) irq_state.buf, 4356 irq_state.len); 4357 break; 4358 } 4359 default: 4360 r = -ENOTTY; 4361 } 4362 4363 vcpu_put(vcpu); 4364 return r; 4365 } 4366 4367 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 4368 { 4369 #ifdef CONFIG_KVM_S390_UCONTROL 4370 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 4371 && (kvm_is_ucontrol(vcpu->kvm))) { 4372 vmf->page = virt_to_page(vcpu->arch.sie_block); 4373 get_page(vmf->page); 4374 return 0; 4375 } 4376 #endif 4377 return VM_FAULT_SIGBUS; 4378 } 4379 4380 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 4381 unsigned long npages) 4382 { 4383 return 0; 4384 } 4385 4386 /* Section: memory related */ 4387 int kvm_arch_prepare_memory_region(struct kvm *kvm, 4388 struct kvm_memory_slot *memslot, 4389 const struct kvm_userspace_memory_region *mem, 4390 enum kvm_mr_change change) 4391 { 4392 /* A few sanity checks. We can have memory slots which have to be 4393 located/ended at a segment boundary (1MB). The memory in userland is 4394 ok to be fragmented into various different vmas. It is okay to mmap() 4395 and munmap() stuff in this slot after doing this call at any time */ 4396 4397 if (mem->userspace_addr & 0xffffful) 4398 return -EINVAL; 4399 4400 if (mem->memory_size & 0xffffful) 4401 return -EINVAL; 4402 4403 if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit) 4404 return -EINVAL; 4405 4406 return 0; 4407 } 4408 4409 void kvm_arch_commit_memory_region(struct kvm *kvm, 4410 const struct kvm_userspace_memory_region *mem, 4411 const struct kvm_memory_slot *old, 4412 const struct kvm_memory_slot *new, 4413 enum kvm_mr_change change) 4414 { 4415 int rc; 4416 4417 /* If the basics of the memslot do not change, we do not want 4418 * to update the gmap. Every update causes several unnecessary 4419 * segment translation exceptions. This is usually handled just 4420 * fine by the normal fault handler + gmap, but it will also 4421 * cause faults on the prefix page of running guest CPUs. 4422 */ 4423 if (old->userspace_addr == mem->userspace_addr && 4424 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr && 4425 old->npages * PAGE_SIZE == mem->memory_size) 4426 return; 4427 4428 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr, 4429 mem->guest_phys_addr, mem->memory_size); 4430 if (rc) 4431 pr_warn("failed to commit memory region\n"); 4432 return; 4433 } 4434 4435 static inline unsigned long nonhyp_mask(int i) 4436 { 4437 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; 4438 4439 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); 4440 } 4441 4442 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) 4443 { 4444 vcpu->valid_wakeup = false; 4445 } 4446 4447 static int __init kvm_s390_init(void) 4448 { 4449 int i; 4450 4451 if (!sclp.has_sief2) { 4452 pr_info("SIE is not available\n"); 4453 return -ENODEV; 4454 } 4455 4456 if (nested && hpage) { 4457 pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n"); 4458 return -EINVAL; 4459 } 4460 4461 for (i = 0; i < 16; i++) 4462 kvm_s390_fac_base[i] |= 4463 S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i); 4464 4465 return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); 4466 } 4467 4468 static void __exit kvm_s390_exit(void) 4469 { 4470 kvm_exit(); 4471 } 4472 4473 module_init(kvm_s390_init); 4474 module_exit(kvm_s390_exit); 4475 4476 /* 4477 * Enable autoloading of the kvm module. 4478 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 4479 * since x86 takes a different approach. 4480 */ 4481 #include <linux/miscdevice.h> 4482 MODULE_ALIAS_MISCDEV(KVM_MINOR); 4483 MODULE_ALIAS("devname:kvm"); 4484