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_no_poll_steal", VCPU_STAT(halt_no_poll_steal) }, 79 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 80 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) }, 81 { "instruction_lctl", VCPU_STAT(instruction_lctl) }, 82 { "instruction_stctl", VCPU_STAT(instruction_stctl) }, 83 { "instruction_stctg", VCPU_STAT(instruction_stctg) }, 84 { "deliver_ckc", VCPU_STAT(deliver_ckc) }, 85 { "deliver_cputm", VCPU_STAT(deliver_cputm) }, 86 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) }, 87 { "deliver_external_call", VCPU_STAT(deliver_external_call) }, 88 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) }, 89 { "deliver_virtio", VCPU_STAT(deliver_virtio) }, 90 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) }, 91 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) }, 92 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) }, 93 { "deliver_program", VCPU_STAT(deliver_program) }, 94 { "deliver_io", VCPU_STAT(deliver_io) }, 95 { "deliver_machine_check", VCPU_STAT(deliver_machine_check) }, 96 { "exit_wait_state", VCPU_STAT(exit_wait_state) }, 97 { "inject_ckc", VCPU_STAT(inject_ckc) }, 98 { "inject_cputm", VCPU_STAT(inject_cputm) }, 99 { "inject_external_call", VCPU_STAT(inject_external_call) }, 100 { "inject_float_mchk", VM_STAT(inject_float_mchk) }, 101 { "inject_emergency_signal", VCPU_STAT(inject_emergency_signal) }, 102 { "inject_io", VM_STAT(inject_io) }, 103 { "inject_mchk", VCPU_STAT(inject_mchk) }, 104 { "inject_pfault_done", VM_STAT(inject_pfault_done) }, 105 { "inject_program", VCPU_STAT(inject_program) }, 106 { "inject_restart", VCPU_STAT(inject_restart) }, 107 { "inject_service_signal", VM_STAT(inject_service_signal) }, 108 { "inject_set_prefix", VCPU_STAT(inject_set_prefix) }, 109 { "inject_stop_signal", VCPU_STAT(inject_stop_signal) }, 110 { "inject_pfault_init", VCPU_STAT(inject_pfault_init) }, 111 { "inject_virtio", VM_STAT(inject_virtio) }, 112 { "instruction_epsw", VCPU_STAT(instruction_epsw) }, 113 { "instruction_gs", VCPU_STAT(instruction_gs) }, 114 { "instruction_io_other", VCPU_STAT(instruction_io_other) }, 115 { "instruction_lpsw", VCPU_STAT(instruction_lpsw) }, 116 { "instruction_lpswe", VCPU_STAT(instruction_lpswe) }, 117 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) }, 118 { "instruction_ptff", VCPU_STAT(instruction_ptff) }, 119 { "instruction_stidp", VCPU_STAT(instruction_stidp) }, 120 { "instruction_sck", VCPU_STAT(instruction_sck) }, 121 { "instruction_sckpf", VCPU_STAT(instruction_sckpf) }, 122 { "instruction_spx", VCPU_STAT(instruction_spx) }, 123 { "instruction_stpx", VCPU_STAT(instruction_stpx) }, 124 { "instruction_stap", VCPU_STAT(instruction_stap) }, 125 { "instruction_iske", VCPU_STAT(instruction_iske) }, 126 { "instruction_ri", VCPU_STAT(instruction_ri) }, 127 { "instruction_rrbe", VCPU_STAT(instruction_rrbe) }, 128 { "instruction_sske", VCPU_STAT(instruction_sske) }, 129 { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) }, 130 { "instruction_essa", VCPU_STAT(instruction_essa) }, 131 { "instruction_stsi", VCPU_STAT(instruction_stsi) }, 132 { "instruction_stfl", VCPU_STAT(instruction_stfl) }, 133 { "instruction_tb", VCPU_STAT(instruction_tb) }, 134 { "instruction_tpi", VCPU_STAT(instruction_tpi) }, 135 { "instruction_tprot", VCPU_STAT(instruction_tprot) }, 136 { "instruction_tsch", VCPU_STAT(instruction_tsch) }, 137 { "instruction_sthyi", VCPU_STAT(instruction_sthyi) }, 138 { "instruction_sie", VCPU_STAT(instruction_sie) }, 139 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) }, 140 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) }, 141 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) }, 142 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) }, 143 { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) }, 144 { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) }, 145 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) }, 146 { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) }, 147 { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) }, 148 { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) }, 149 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) }, 150 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) }, 151 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) }, 152 { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) }, 153 { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) }, 154 { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) }, 155 { "instruction_diag_10", VCPU_STAT(diagnose_10) }, 156 { "instruction_diag_44", VCPU_STAT(diagnose_44) }, 157 { "instruction_diag_9c", VCPU_STAT(diagnose_9c) }, 158 { "instruction_diag_258", VCPU_STAT(diagnose_258) }, 159 { "instruction_diag_308", VCPU_STAT(diagnose_308) }, 160 { "instruction_diag_500", VCPU_STAT(diagnose_500) }, 161 { "instruction_diag_other", VCPU_STAT(diagnose_other) }, 162 { NULL } 163 }; 164 165 struct kvm_s390_tod_clock_ext { 166 __u8 epoch_idx; 167 __u64 tod; 168 __u8 reserved[7]; 169 } __packed; 170 171 /* allow nested virtualization in KVM (if enabled by user space) */ 172 static int nested; 173 module_param(nested, int, S_IRUGO); 174 MODULE_PARM_DESC(nested, "Nested virtualization support"); 175 176 /* allow 1m huge page guest backing, if !nested */ 177 static int hpage; 178 module_param(hpage, int, 0444); 179 MODULE_PARM_DESC(hpage, "1m huge page backing support"); 180 181 /* maximum percentage of steal time for polling. >100 is treated like 100 */ 182 static u8 halt_poll_max_steal = 10; 183 module_param(halt_poll_max_steal, byte, 0644); 184 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling"); 185 186 /* 187 * For now we handle at most 16 double words as this is what the s390 base 188 * kernel handles and stores in the prefix page. If we ever need to go beyond 189 * this, this requires changes to code, but the external uapi can stay. 190 */ 191 #define SIZE_INTERNAL 16 192 193 /* 194 * Base feature mask that defines default mask for facilities. Consists of the 195 * defines in FACILITIES_KVM and the non-hypervisor managed bits. 196 */ 197 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM }; 198 /* 199 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL 200 * and defines the facilities that can be enabled via a cpu model. 201 */ 202 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL }; 203 204 static unsigned long kvm_s390_fac_size(void) 205 { 206 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64); 207 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64); 208 BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) > 209 sizeof(S390_lowcore.stfle_fac_list)); 210 211 return SIZE_INTERNAL; 212 } 213 214 /* available cpu features supported by kvm */ 215 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 216 /* available subfunctions indicated via query / "test bit" */ 217 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; 218 219 static struct gmap_notifier gmap_notifier; 220 static struct gmap_notifier vsie_gmap_notifier; 221 debug_info_t *kvm_s390_dbf; 222 223 /* Section: not file related */ 224 int kvm_arch_hardware_enable(void) 225 { 226 /* every s390 is virtualization enabled ;-) */ 227 return 0; 228 } 229 230 int kvm_arch_check_processor_compat(void) 231 { 232 return 0; 233 } 234 235 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 236 unsigned long end); 237 238 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta) 239 { 240 u8 delta_idx = 0; 241 242 /* 243 * The TOD jumps by delta, we have to compensate this by adding 244 * -delta to the epoch. 245 */ 246 delta = -delta; 247 248 /* sign-extension - we're adding to signed values below */ 249 if ((s64)delta < 0) 250 delta_idx = -1; 251 252 scb->epoch += delta; 253 if (scb->ecd & ECD_MEF) { 254 scb->epdx += delta_idx; 255 if (scb->epoch < delta) 256 scb->epdx += 1; 257 } 258 } 259 260 /* 261 * This callback is executed during stop_machine(). All CPUs are therefore 262 * temporarily stopped. In order not to change guest behavior, we have to 263 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 264 * so a CPU won't be stopped while calculating with the epoch. 265 */ 266 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 267 void *v) 268 { 269 struct kvm *kvm; 270 struct kvm_vcpu *vcpu; 271 int i; 272 unsigned long long *delta = v; 273 274 list_for_each_entry(kvm, &vm_list, vm_list) { 275 kvm_for_each_vcpu(i, vcpu, kvm) { 276 kvm_clock_sync_scb(vcpu->arch.sie_block, *delta); 277 if (i == 0) { 278 kvm->arch.epoch = vcpu->arch.sie_block->epoch; 279 kvm->arch.epdx = vcpu->arch.sie_block->epdx; 280 } 281 if (vcpu->arch.cputm_enabled) 282 vcpu->arch.cputm_start += *delta; 283 if (vcpu->arch.vsie_block) 284 kvm_clock_sync_scb(vcpu->arch.vsie_block, 285 *delta); 286 } 287 } 288 return NOTIFY_OK; 289 } 290 291 static struct notifier_block kvm_clock_notifier = { 292 .notifier_call = kvm_clock_sync, 293 }; 294 295 int kvm_arch_hardware_setup(void) 296 { 297 gmap_notifier.notifier_call = kvm_gmap_notifier; 298 gmap_register_pte_notifier(&gmap_notifier); 299 vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier; 300 gmap_register_pte_notifier(&vsie_gmap_notifier); 301 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 302 &kvm_clock_notifier); 303 return 0; 304 } 305 306 void kvm_arch_hardware_unsetup(void) 307 { 308 gmap_unregister_pte_notifier(&gmap_notifier); 309 gmap_unregister_pte_notifier(&vsie_gmap_notifier); 310 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 311 &kvm_clock_notifier); 312 } 313 314 static void allow_cpu_feat(unsigned long nr) 315 { 316 set_bit_inv(nr, kvm_s390_available_cpu_feat); 317 } 318 319 static inline int plo_test_bit(unsigned char nr) 320 { 321 register unsigned long r0 asm("0") = (unsigned long) nr | 0x100; 322 int cc; 323 324 asm volatile( 325 /* Parameter registers are ignored for "test bit" */ 326 " plo 0,0,0,0(0)\n" 327 " ipm %0\n" 328 " srl %0,28\n" 329 : "=d" (cc) 330 : "d" (r0) 331 : "cc"); 332 return cc == 0; 333 } 334 335 static __always_inline void __insn32_query(unsigned int opcode, u8 *query) 336 { 337 register unsigned long r0 asm("0") = 0; /* query function */ 338 register unsigned long r1 asm("1") = (unsigned long) query; 339 340 asm volatile( 341 /* Parameter regs are ignored */ 342 " .insn rrf,%[opc] << 16,2,4,6,0\n" 343 : 344 : "d" (r0), "a" (r1), [opc] "i" (opcode) 345 : "cc", "memory"); 346 } 347 348 #define INSN_SORTL 0xb938 349 #define INSN_DFLTCC 0xb939 350 351 static void kvm_s390_cpu_feat_init(void) 352 { 353 int i; 354 355 for (i = 0; i < 256; ++i) { 356 if (plo_test_bit(i)) 357 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); 358 } 359 360 if (test_facility(28)) /* TOD-clock steering */ 361 ptff(kvm_s390_available_subfunc.ptff, 362 sizeof(kvm_s390_available_subfunc.ptff), 363 PTFF_QAF); 364 365 if (test_facility(17)) { /* MSA */ 366 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *) 367 kvm_s390_available_subfunc.kmac); 368 __cpacf_query(CPACF_KMC, (cpacf_mask_t *) 369 kvm_s390_available_subfunc.kmc); 370 __cpacf_query(CPACF_KM, (cpacf_mask_t *) 371 kvm_s390_available_subfunc.km); 372 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *) 373 kvm_s390_available_subfunc.kimd); 374 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *) 375 kvm_s390_available_subfunc.klmd); 376 } 377 if (test_facility(76)) /* MSA3 */ 378 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *) 379 kvm_s390_available_subfunc.pckmo); 380 if (test_facility(77)) { /* MSA4 */ 381 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *) 382 kvm_s390_available_subfunc.kmctr); 383 __cpacf_query(CPACF_KMF, (cpacf_mask_t *) 384 kvm_s390_available_subfunc.kmf); 385 __cpacf_query(CPACF_KMO, (cpacf_mask_t *) 386 kvm_s390_available_subfunc.kmo); 387 __cpacf_query(CPACF_PCC, (cpacf_mask_t *) 388 kvm_s390_available_subfunc.pcc); 389 } 390 if (test_facility(57)) /* MSA5 */ 391 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *) 392 kvm_s390_available_subfunc.ppno); 393 394 if (test_facility(146)) /* MSA8 */ 395 __cpacf_query(CPACF_KMA, (cpacf_mask_t *) 396 kvm_s390_available_subfunc.kma); 397 398 if (test_facility(155)) /* MSA9 */ 399 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *) 400 kvm_s390_available_subfunc.kdsa); 401 402 if (test_facility(150)) /* SORTL */ 403 __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl); 404 405 if (test_facility(151)) /* DFLTCC */ 406 __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc); 407 408 if (MACHINE_HAS_ESOP) 409 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); 410 /* 411 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), 412 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). 413 */ 414 if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao || 415 !test_facility(3) || !nested) 416 return; 417 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); 418 if (sclp.has_64bscao) 419 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); 420 if (sclp.has_siif) 421 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); 422 if (sclp.has_gpere) 423 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); 424 if (sclp.has_gsls) 425 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); 426 if (sclp.has_ib) 427 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); 428 if (sclp.has_cei) 429 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); 430 if (sclp.has_ibs) 431 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); 432 if (sclp.has_kss) 433 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS); 434 /* 435 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make 436 * all skey handling functions read/set the skey from the PGSTE 437 * instead of the real storage key. 438 * 439 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make 440 * pages being detected as preserved although they are resident. 441 * 442 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will 443 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. 444 * 445 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and 446 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be 447 * correctly shadowed. We can do that for the PGSTE but not for PTE.I. 448 * 449 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We 450 * cannot easily shadow the SCA because of the ipte lock. 451 */ 452 } 453 454 int kvm_arch_init(void *opaque) 455 { 456 int rc; 457 458 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 459 if (!kvm_s390_dbf) 460 return -ENOMEM; 461 462 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) { 463 rc = -ENOMEM; 464 goto out_debug_unreg; 465 } 466 467 kvm_s390_cpu_feat_init(); 468 469 /* Register floating interrupt controller interface. */ 470 rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 471 if (rc) { 472 pr_err("A FLIC registration call failed with rc=%d\n", rc); 473 goto out_debug_unreg; 474 } 475 476 rc = kvm_s390_gib_init(GAL_ISC); 477 if (rc) 478 goto out_gib_destroy; 479 480 return 0; 481 482 out_gib_destroy: 483 kvm_s390_gib_destroy(); 484 out_debug_unreg: 485 debug_unregister(kvm_s390_dbf); 486 return rc; 487 } 488 489 void kvm_arch_exit(void) 490 { 491 kvm_s390_gib_destroy(); 492 debug_unregister(kvm_s390_dbf); 493 } 494 495 /* Section: device related */ 496 long kvm_arch_dev_ioctl(struct file *filp, 497 unsigned int ioctl, unsigned long arg) 498 { 499 if (ioctl == KVM_S390_ENABLE_SIE) 500 return s390_enable_sie(); 501 return -EINVAL; 502 } 503 504 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 505 { 506 int r; 507 508 switch (ext) { 509 case KVM_CAP_S390_PSW: 510 case KVM_CAP_S390_GMAP: 511 case KVM_CAP_SYNC_MMU: 512 #ifdef CONFIG_KVM_S390_UCONTROL 513 case KVM_CAP_S390_UCONTROL: 514 #endif 515 case KVM_CAP_ASYNC_PF: 516 case KVM_CAP_SYNC_REGS: 517 case KVM_CAP_ONE_REG: 518 case KVM_CAP_ENABLE_CAP: 519 case KVM_CAP_S390_CSS_SUPPORT: 520 case KVM_CAP_IOEVENTFD: 521 case KVM_CAP_DEVICE_CTRL: 522 case KVM_CAP_S390_IRQCHIP: 523 case KVM_CAP_VM_ATTRIBUTES: 524 case KVM_CAP_MP_STATE: 525 case KVM_CAP_IMMEDIATE_EXIT: 526 case KVM_CAP_S390_INJECT_IRQ: 527 case KVM_CAP_S390_USER_SIGP: 528 case KVM_CAP_S390_USER_STSI: 529 case KVM_CAP_S390_SKEYS: 530 case KVM_CAP_S390_IRQ_STATE: 531 case KVM_CAP_S390_USER_INSTR0: 532 case KVM_CAP_S390_CMMA_MIGRATION: 533 case KVM_CAP_S390_AIS: 534 case KVM_CAP_S390_AIS_MIGRATION: 535 r = 1; 536 break; 537 case KVM_CAP_S390_HPAGE_1M: 538 r = 0; 539 if (hpage && !kvm_is_ucontrol(kvm)) 540 r = 1; 541 break; 542 case KVM_CAP_S390_MEM_OP: 543 r = MEM_OP_MAX_SIZE; 544 break; 545 case KVM_CAP_NR_VCPUS: 546 case KVM_CAP_MAX_VCPUS: 547 case KVM_CAP_MAX_VCPU_ID: 548 r = KVM_S390_BSCA_CPU_SLOTS; 549 if (!kvm_s390_use_sca_entries()) 550 r = KVM_MAX_VCPUS; 551 else if (sclp.has_esca && sclp.has_64bscao) 552 r = KVM_S390_ESCA_CPU_SLOTS; 553 break; 554 case KVM_CAP_S390_COW: 555 r = MACHINE_HAS_ESOP; 556 break; 557 case KVM_CAP_S390_VECTOR_REGISTERS: 558 r = MACHINE_HAS_VX; 559 break; 560 case KVM_CAP_S390_RI: 561 r = test_facility(64); 562 break; 563 case KVM_CAP_S390_GS: 564 r = test_facility(133); 565 break; 566 case KVM_CAP_S390_BPB: 567 r = test_facility(82); 568 break; 569 default: 570 r = 0; 571 } 572 return r; 573 } 574 575 static void kvm_s390_sync_dirty_log(struct kvm *kvm, 576 struct kvm_memory_slot *memslot) 577 { 578 int i; 579 gfn_t cur_gfn, last_gfn; 580 unsigned long gaddr, vmaddr; 581 struct gmap *gmap = kvm->arch.gmap; 582 DECLARE_BITMAP(bitmap, _PAGE_ENTRIES); 583 584 /* Loop over all guest segments */ 585 cur_gfn = memslot->base_gfn; 586 last_gfn = memslot->base_gfn + memslot->npages; 587 for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) { 588 gaddr = gfn_to_gpa(cur_gfn); 589 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn); 590 if (kvm_is_error_hva(vmaddr)) 591 continue; 592 593 bitmap_zero(bitmap, _PAGE_ENTRIES); 594 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr); 595 for (i = 0; i < _PAGE_ENTRIES; i++) { 596 if (test_bit(i, bitmap)) 597 mark_page_dirty(kvm, cur_gfn + i); 598 } 599 600 if (fatal_signal_pending(current)) 601 return; 602 cond_resched(); 603 } 604 } 605 606 /* Section: vm related */ 607 static void sca_del_vcpu(struct kvm_vcpu *vcpu); 608 609 /* 610 * Get (and clear) the dirty memory log for a memory slot. 611 */ 612 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 613 struct kvm_dirty_log *log) 614 { 615 int r; 616 unsigned long n; 617 struct kvm_memslots *slots; 618 struct kvm_memory_slot *memslot; 619 int is_dirty = 0; 620 621 if (kvm_is_ucontrol(kvm)) 622 return -EINVAL; 623 624 mutex_lock(&kvm->slots_lock); 625 626 r = -EINVAL; 627 if (log->slot >= KVM_USER_MEM_SLOTS) 628 goto out; 629 630 slots = kvm_memslots(kvm); 631 memslot = id_to_memslot(slots, log->slot); 632 r = -ENOENT; 633 if (!memslot->dirty_bitmap) 634 goto out; 635 636 kvm_s390_sync_dirty_log(kvm, memslot); 637 r = kvm_get_dirty_log(kvm, log, &is_dirty); 638 if (r) 639 goto out; 640 641 /* Clear the dirty log */ 642 if (is_dirty) { 643 n = kvm_dirty_bitmap_bytes(memslot); 644 memset(memslot->dirty_bitmap, 0, n); 645 } 646 r = 0; 647 out: 648 mutex_unlock(&kvm->slots_lock); 649 return r; 650 } 651 652 static void icpt_operexc_on_all_vcpus(struct kvm *kvm) 653 { 654 unsigned int i; 655 struct kvm_vcpu *vcpu; 656 657 kvm_for_each_vcpu(i, vcpu, kvm) { 658 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); 659 } 660 } 661 662 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 663 { 664 int r; 665 666 if (cap->flags) 667 return -EINVAL; 668 669 switch (cap->cap) { 670 case KVM_CAP_S390_IRQCHIP: 671 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 672 kvm->arch.use_irqchip = 1; 673 r = 0; 674 break; 675 case KVM_CAP_S390_USER_SIGP: 676 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 677 kvm->arch.user_sigp = 1; 678 r = 0; 679 break; 680 case KVM_CAP_S390_VECTOR_REGISTERS: 681 mutex_lock(&kvm->lock); 682 if (kvm->created_vcpus) { 683 r = -EBUSY; 684 } else if (MACHINE_HAS_VX) { 685 set_kvm_facility(kvm->arch.model.fac_mask, 129); 686 set_kvm_facility(kvm->arch.model.fac_list, 129); 687 if (test_facility(134)) { 688 set_kvm_facility(kvm->arch.model.fac_mask, 134); 689 set_kvm_facility(kvm->arch.model.fac_list, 134); 690 } 691 if (test_facility(135)) { 692 set_kvm_facility(kvm->arch.model.fac_mask, 135); 693 set_kvm_facility(kvm->arch.model.fac_list, 135); 694 } 695 if (test_facility(148)) { 696 set_kvm_facility(kvm->arch.model.fac_mask, 148); 697 set_kvm_facility(kvm->arch.model.fac_list, 148); 698 } 699 if (test_facility(152)) { 700 set_kvm_facility(kvm->arch.model.fac_mask, 152); 701 set_kvm_facility(kvm->arch.model.fac_list, 152); 702 } 703 r = 0; 704 } else 705 r = -EINVAL; 706 mutex_unlock(&kvm->lock); 707 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 708 r ? "(not available)" : "(success)"); 709 break; 710 case KVM_CAP_S390_RI: 711 r = -EINVAL; 712 mutex_lock(&kvm->lock); 713 if (kvm->created_vcpus) { 714 r = -EBUSY; 715 } else if (test_facility(64)) { 716 set_kvm_facility(kvm->arch.model.fac_mask, 64); 717 set_kvm_facility(kvm->arch.model.fac_list, 64); 718 r = 0; 719 } 720 mutex_unlock(&kvm->lock); 721 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", 722 r ? "(not available)" : "(success)"); 723 break; 724 case KVM_CAP_S390_AIS: 725 mutex_lock(&kvm->lock); 726 if (kvm->created_vcpus) { 727 r = -EBUSY; 728 } else { 729 set_kvm_facility(kvm->arch.model.fac_mask, 72); 730 set_kvm_facility(kvm->arch.model.fac_list, 72); 731 r = 0; 732 } 733 mutex_unlock(&kvm->lock); 734 VM_EVENT(kvm, 3, "ENABLE: AIS %s", 735 r ? "(not available)" : "(success)"); 736 break; 737 case KVM_CAP_S390_GS: 738 r = -EINVAL; 739 mutex_lock(&kvm->lock); 740 if (kvm->created_vcpus) { 741 r = -EBUSY; 742 } else if (test_facility(133)) { 743 set_kvm_facility(kvm->arch.model.fac_mask, 133); 744 set_kvm_facility(kvm->arch.model.fac_list, 133); 745 r = 0; 746 } 747 mutex_unlock(&kvm->lock); 748 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s", 749 r ? "(not available)" : "(success)"); 750 break; 751 case KVM_CAP_S390_HPAGE_1M: 752 mutex_lock(&kvm->lock); 753 if (kvm->created_vcpus) 754 r = -EBUSY; 755 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) 756 r = -EINVAL; 757 else { 758 r = 0; 759 down_write(&kvm->mm->mmap_sem); 760 kvm->mm->context.allow_gmap_hpage_1m = 1; 761 up_write(&kvm->mm->mmap_sem); 762 /* 763 * We might have to create fake 4k page 764 * tables. To avoid that the hardware works on 765 * stale PGSTEs, we emulate these instructions. 766 */ 767 kvm->arch.use_skf = 0; 768 kvm->arch.use_pfmfi = 0; 769 } 770 mutex_unlock(&kvm->lock); 771 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s", 772 r ? "(not available)" : "(success)"); 773 break; 774 case KVM_CAP_S390_USER_STSI: 775 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 776 kvm->arch.user_stsi = 1; 777 r = 0; 778 break; 779 case KVM_CAP_S390_USER_INSTR0: 780 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); 781 kvm->arch.user_instr0 = 1; 782 icpt_operexc_on_all_vcpus(kvm); 783 r = 0; 784 break; 785 default: 786 r = -EINVAL; 787 break; 788 } 789 return r; 790 } 791 792 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 793 { 794 int ret; 795 796 switch (attr->attr) { 797 case KVM_S390_VM_MEM_LIMIT_SIZE: 798 ret = 0; 799 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 800 kvm->arch.mem_limit); 801 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) 802 ret = -EFAULT; 803 break; 804 default: 805 ret = -ENXIO; 806 break; 807 } 808 return ret; 809 } 810 811 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 812 { 813 int ret; 814 unsigned int idx; 815 switch (attr->attr) { 816 case KVM_S390_VM_MEM_ENABLE_CMMA: 817 ret = -ENXIO; 818 if (!sclp.has_cmma) 819 break; 820 821 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 822 mutex_lock(&kvm->lock); 823 if (kvm->created_vcpus) 824 ret = -EBUSY; 825 else if (kvm->mm->context.allow_gmap_hpage_1m) 826 ret = -EINVAL; 827 else { 828 kvm->arch.use_cmma = 1; 829 /* Not compatible with cmma. */ 830 kvm->arch.use_pfmfi = 0; 831 ret = 0; 832 } 833 mutex_unlock(&kvm->lock); 834 break; 835 case KVM_S390_VM_MEM_CLR_CMMA: 836 ret = -ENXIO; 837 if (!sclp.has_cmma) 838 break; 839 ret = -EINVAL; 840 if (!kvm->arch.use_cmma) 841 break; 842 843 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 844 mutex_lock(&kvm->lock); 845 idx = srcu_read_lock(&kvm->srcu); 846 s390_reset_cmma(kvm->arch.gmap->mm); 847 srcu_read_unlock(&kvm->srcu, idx); 848 mutex_unlock(&kvm->lock); 849 ret = 0; 850 break; 851 case KVM_S390_VM_MEM_LIMIT_SIZE: { 852 unsigned long new_limit; 853 854 if (kvm_is_ucontrol(kvm)) 855 return -EINVAL; 856 857 if (get_user(new_limit, (u64 __user *)attr->addr)) 858 return -EFAULT; 859 860 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && 861 new_limit > kvm->arch.mem_limit) 862 return -E2BIG; 863 864 if (!new_limit) 865 return -EINVAL; 866 867 /* gmap_create takes last usable address */ 868 if (new_limit != KVM_S390_NO_MEM_LIMIT) 869 new_limit -= 1; 870 871 ret = -EBUSY; 872 mutex_lock(&kvm->lock); 873 if (!kvm->created_vcpus) { 874 /* gmap_create will round the limit up */ 875 struct gmap *new = gmap_create(current->mm, new_limit); 876 877 if (!new) { 878 ret = -ENOMEM; 879 } else { 880 gmap_remove(kvm->arch.gmap); 881 new->private = kvm; 882 kvm->arch.gmap = new; 883 ret = 0; 884 } 885 } 886 mutex_unlock(&kvm->lock); 887 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); 888 VM_EVENT(kvm, 3, "New guest asce: 0x%pK", 889 (void *) kvm->arch.gmap->asce); 890 break; 891 } 892 default: 893 ret = -ENXIO; 894 break; 895 } 896 return ret; 897 } 898 899 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 900 901 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) 902 { 903 struct kvm_vcpu *vcpu; 904 int i; 905 906 kvm_s390_vcpu_block_all(kvm); 907 908 kvm_for_each_vcpu(i, vcpu, kvm) { 909 kvm_s390_vcpu_crypto_setup(vcpu); 910 /* recreate the shadow crycb by leaving the VSIE handler */ 911 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 912 } 913 914 kvm_s390_vcpu_unblock_all(kvm); 915 } 916 917 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 918 { 919 mutex_lock(&kvm->lock); 920 switch (attr->attr) { 921 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 922 if (!test_kvm_facility(kvm, 76)) { 923 mutex_unlock(&kvm->lock); 924 return -EINVAL; 925 } 926 get_random_bytes( 927 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 928 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 929 kvm->arch.crypto.aes_kw = 1; 930 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 931 break; 932 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 933 if (!test_kvm_facility(kvm, 76)) { 934 mutex_unlock(&kvm->lock); 935 return -EINVAL; 936 } 937 get_random_bytes( 938 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 939 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 940 kvm->arch.crypto.dea_kw = 1; 941 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 942 break; 943 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 944 if (!test_kvm_facility(kvm, 76)) { 945 mutex_unlock(&kvm->lock); 946 return -EINVAL; 947 } 948 kvm->arch.crypto.aes_kw = 0; 949 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 950 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 951 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 952 break; 953 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 954 if (!test_kvm_facility(kvm, 76)) { 955 mutex_unlock(&kvm->lock); 956 return -EINVAL; 957 } 958 kvm->arch.crypto.dea_kw = 0; 959 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 960 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 961 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 962 break; 963 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 964 if (!ap_instructions_available()) { 965 mutex_unlock(&kvm->lock); 966 return -EOPNOTSUPP; 967 } 968 kvm->arch.crypto.apie = 1; 969 break; 970 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 971 if (!ap_instructions_available()) { 972 mutex_unlock(&kvm->lock); 973 return -EOPNOTSUPP; 974 } 975 kvm->arch.crypto.apie = 0; 976 break; 977 default: 978 mutex_unlock(&kvm->lock); 979 return -ENXIO; 980 } 981 982 kvm_s390_vcpu_crypto_reset_all(kvm); 983 mutex_unlock(&kvm->lock); 984 return 0; 985 } 986 987 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) 988 { 989 int cx; 990 struct kvm_vcpu *vcpu; 991 992 kvm_for_each_vcpu(cx, vcpu, kvm) 993 kvm_s390_sync_request(req, vcpu); 994 } 995 996 /* 997 * Must be called with kvm->srcu held to avoid races on memslots, and with 998 * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration. 999 */ 1000 static int kvm_s390_vm_start_migration(struct kvm *kvm) 1001 { 1002 struct kvm_memory_slot *ms; 1003 struct kvm_memslots *slots; 1004 unsigned long ram_pages = 0; 1005 int slotnr; 1006 1007 /* migration mode already enabled */ 1008 if (kvm->arch.migration_mode) 1009 return 0; 1010 slots = kvm_memslots(kvm); 1011 if (!slots || !slots->used_slots) 1012 return -EINVAL; 1013 1014 if (!kvm->arch.use_cmma) { 1015 kvm->arch.migration_mode = 1; 1016 return 0; 1017 } 1018 /* mark all the pages in active slots as dirty */ 1019 for (slotnr = 0; slotnr < slots->used_slots; slotnr++) { 1020 ms = slots->memslots + slotnr; 1021 if (!ms->dirty_bitmap) 1022 return -EINVAL; 1023 /* 1024 * The second half of the bitmap is only used on x86, 1025 * and would be wasted otherwise, so we put it to good 1026 * use here to keep track of the state of the storage 1027 * attributes. 1028 */ 1029 memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms)); 1030 ram_pages += ms->npages; 1031 } 1032 atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages); 1033 kvm->arch.migration_mode = 1; 1034 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION); 1035 return 0; 1036 } 1037 1038 /* 1039 * Must be called with kvm->slots_lock to avoid races with ourselves and 1040 * kvm_s390_vm_start_migration. 1041 */ 1042 static int kvm_s390_vm_stop_migration(struct kvm *kvm) 1043 { 1044 /* migration mode already disabled */ 1045 if (!kvm->arch.migration_mode) 1046 return 0; 1047 kvm->arch.migration_mode = 0; 1048 if (kvm->arch.use_cmma) 1049 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION); 1050 return 0; 1051 } 1052 1053 static int kvm_s390_vm_set_migration(struct kvm *kvm, 1054 struct kvm_device_attr *attr) 1055 { 1056 int res = -ENXIO; 1057 1058 mutex_lock(&kvm->slots_lock); 1059 switch (attr->attr) { 1060 case KVM_S390_VM_MIGRATION_START: 1061 res = kvm_s390_vm_start_migration(kvm); 1062 break; 1063 case KVM_S390_VM_MIGRATION_STOP: 1064 res = kvm_s390_vm_stop_migration(kvm); 1065 break; 1066 default: 1067 break; 1068 } 1069 mutex_unlock(&kvm->slots_lock); 1070 1071 return res; 1072 } 1073 1074 static int kvm_s390_vm_get_migration(struct kvm *kvm, 1075 struct kvm_device_attr *attr) 1076 { 1077 u64 mig = kvm->arch.migration_mode; 1078 1079 if (attr->attr != KVM_S390_VM_MIGRATION_STATUS) 1080 return -ENXIO; 1081 1082 if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig))) 1083 return -EFAULT; 1084 return 0; 1085 } 1086 1087 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1088 { 1089 struct kvm_s390_vm_tod_clock gtod; 1090 1091 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 1092 return -EFAULT; 1093 1094 if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) 1095 return -EINVAL; 1096 kvm_s390_set_tod_clock(kvm, >od); 1097 1098 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", 1099 gtod.epoch_idx, gtod.tod); 1100 1101 return 0; 1102 } 1103 1104 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1105 { 1106 u8 gtod_high; 1107 1108 if (copy_from_user(>od_high, (void __user *)attr->addr, 1109 sizeof(gtod_high))) 1110 return -EFAULT; 1111 1112 if (gtod_high != 0) 1113 return -EINVAL; 1114 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 1115 1116 return 0; 1117 } 1118 1119 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1120 { 1121 struct kvm_s390_vm_tod_clock gtod = { 0 }; 1122 1123 if (copy_from_user(>od.tod, (void __user *)attr->addr, 1124 sizeof(gtod.tod))) 1125 return -EFAULT; 1126 1127 kvm_s390_set_tod_clock(kvm, >od); 1128 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); 1129 return 0; 1130 } 1131 1132 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1133 { 1134 int ret; 1135 1136 if (attr->flags) 1137 return -EINVAL; 1138 1139 switch (attr->attr) { 1140 case KVM_S390_VM_TOD_EXT: 1141 ret = kvm_s390_set_tod_ext(kvm, attr); 1142 break; 1143 case KVM_S390_VM_TOD_HIGH: 1144 ret = kvm_s390_set_tod_high(kvm, attr); 1145 break; 1146 case KVM_S390_VM_TOD_LOW: 1147 ret = kvm_s390_set_tod_low(kvm, attr); 1148 break; 1149 default: 1150 ret = -ENXIO; 1151 break; 1152 } 1153 return ret; 1154 } 1155 1156 static void kvm_s390_get_tod_clock(struct kvm *kvm, 1157 struct kvm_s390_vm_tod_clock *gtod) 1158 { 1159 struct kvm_s390_tod_clock_ext htod; 1160 1161 preempt_disable(); 1162 1163 get_tod_clock_ext((char *)&htod); 1164 1165 gtod->tod = htod.tod + kvm->arch.epoch; 1166 gtod->epoch_idx = 0; 1167 if (test_kvm_facility(kvm, 139)) { 1168 gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx; 1169 if (gtod->tod < htod.tod) 1170 gtod->epoch_idx += 1; 1171 } 1172 1173 preempt_enable(); 1174 } 1175 1176 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1177 { 1178 struct kvm_s390_vm_tod_clock gtod; 1179 1180 memset(>od, 0, sizeof(gtod)); 1181 kvm_s390_get_tod_clock(kvm, >od); 1182 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1183 return -EFAULT; 1184 1185 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx", 1186 gtod.epoch_idx, gtod.tod); 1187 return 0; 1188 } 1189 1190 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1191 { 1192 u8 gtod_high = 0; 1193 1194 if (copy_to_user((void __user *)attr->addr, >od_high, 1195 sizeof(gtod_high))) 1196 return -EFAULT; 1197 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 1198 1199 return 0; 1200 } 1201 1202 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1203 { 1204 u64 gtod; 1205 1206 gtod = kvm_s390_get_tod_clock_fast(kvm); 1207 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1208 return -EFAULT; 1209 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 1210 1211 return 0; 1212 } 1213 1214 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1215 { 1216 int ret; 1217 1218 if (attr->flags) 1219 return -EINVAL; 1220 1221 switch (attr->attr) { 1222 case KVM_S390_VM_TOD_EXT: 1223 ret = kvm_s390_get_tod_ext(kvm, attr); 1224 break; 1225 case KVM_S390_VM_TOD_HIGH: 1226 ret = kvm_s390_get_tod_high(kvm, attr); 1227 break; 1228 case KVM_S390_VM_TOD_LOW: 1229 ret = kvm_s390_get_tod_low(kvm, attr); 1230 break; 1231 default: 1232 ret = -ENXIO; 1233 break; 1234 } 1235 return ret; 1236 } 1237 1238 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1239 { 1240 struct kvm_s390_vm_cpu_processor *proc; 1241 u16 lowest_ibc, unblocked_ibc; 1242 int ret = 0; 1243 1244 mutex_lock(&kvm->lock); 1245 if (kvm->created_vcpus) { 1246 ret = -EBUSY; 1247 goto out; 1248 } 1249 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 1250 if (!proc) { 1251 ret = -ENOMEM; 1252 goto out; 1253 } 1254 if (!copy_from_user(proc, (void __user *)attr->addr, 1255 sizeof(*proc))) { 1256 kvm->arch.model.cpuid = proc->cpuid; 1257 lowest_ibc = sclp.ibc >> 16 & 0xfff; 1258 unblocked_ibc = sclp.ibc & 0xfff; 1259 if (lowest_ibc && proc->ibc) { 1260 if (proc->ibc > unblocked_ibc) 1261 kvm->arch.model.ibc = unblocked_ibc; 1262 else if (proc->ibc < lowest_ibc) 1263 kvm->arch.model.ibc = lowest_ibc; 1264 else 1265 kvm->arch.model.ibc = proc->ibc; 1266 } 1267 memcpy(kvm->arch.model.fac_list, proc->fac_list, 1268 S390_ARCH_FAC_LIST_SIZE_BYTE); 1269 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1270 kvm->arch.model.ibc, 1271 kvm->arch.model.cpuid); 1272 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1273 kvm->arch.model.fac_list[0], 1274 kvm->arch.model.fac_list[1], 1275 kvm->arch.model.fac_list[2]); 1276 } else 1277 ret = -EFAULT; 1278 kfree(proc); 1279 out: 1280 mutex_unlock(&kvm->lock); 1281 return ret; 1282 } 1283 1284 static int kvm_s390_set_processor_feat(struct kvm *kvm, 1285 struct kvm_device_attr *attr) 1286 { 1287 struct kvm_s390_vm_cpu_feat data; 1288 1289 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) 1290 return -EFAULT; 1291 if (!bitmap_subset((unsigned long *) data.feat, 1292 kvm_s390_available_cpu_feat, 1293 KVM_S390_VM_CPU_FEAT_NR_BITS)) 1294 return -EINVAL; 1295 1296 mutex_lock(&kvm->lock); 1297 if (kvm->created_vcpus) { 1298 mutex_unlock(&kvm->lock); 1299 return -EBUSY; 1300 } 1301 bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat, 1302 KVM_S390_VM_CPU_FEAT_NR_BITS); 1303 mutex_unlock(&kvm->lock); 1304 VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1305 data.feat[0], 1306 data.feat[1], 1307 data.feat[2]); 1308 return 0; 1309 } 1310 1311 static int kvm_s390_set_processor_subfunc(struct kvm *kvm, 1312 struct kvm_device_attr *attr) 1313 { 1314 mutex_lock(&kvm->lock); 1315 if (kvm->created_vcpus) { 1316 mutex_unlock(&kvm->lock); 1317 return -EBUSY; 1318 } 1319 1320 if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr, 1321 sizeof(struct kvm_s390_vm_cpu_subfunc))) { 1322 mutex_unlock(&kvm->lock); 1323 return -EFAULT; 1324 } 1325 mutex_unlock(&kvm->lock); 1326 1327 VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1328 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1329 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1330 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1331 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1332 VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1333 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1334 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1335 VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1336 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1337 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1338 VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1339 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1340 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1341 VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx", 1342 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1343 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1344 VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1345 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1346 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1347 VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1348 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1349 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1350 VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1351 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1352 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1353 VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1354 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1355 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1356 VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1357 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1358 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1359 VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1360 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1361 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1362 VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1363 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1364 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1365 VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1366 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1367 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1368 VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1369 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1370 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1371 VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1372 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1373 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1374 VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1375 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1376 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1377 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1378 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1379 VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1380 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1381 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1382 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1383 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1384 1385 return 0; 1386 } 1387 1388 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1389 { 1390 int ret = -ENXIO; 1391 1392 switch (attr->attr) { 1393 case KVM_S390_VM_CPU_PROCESSOR: 1394 ret = kvm_s390_set_processor(kvm, attr); 1395 break; 1396 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1397 ret = kvm_s390_set_processor_feat(kvm, attr); 1398 break; 1399 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1400 ret = kvm_s390_set_processor_subfunc(kvm, attr); 1401 break; 1402 } 1403 return ret; 1404 } 1405 1406 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1407 { 1408 struct kvm_s390_vm_cpu_processor *proc; 1409 int ret = 0; 1410 1411 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 1412 if (!proc) { 1413 ret = -ENOMEM; 1414 goto out; 1415 } 1416 proc->cpuid = kvm->arch.model.cpuid; 1417 proc->ibc = kvm->arch.model.ibc; 1418 memcpy(&proc->fac_list, kvm->arch.model.fac_list, 1419 S390_ARCH_FAC_LIST_SIZE_BYTE); 1420 VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1421 kvm->arch.model.ibc, 1422 kvm->arch.model.cpuid); 1423 VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1424 kvm->arch.model.fac_list[0], 1425 kvm->arch.model.fac_list[1], 1426 kvm->arch.model.fac_list[2]); 1427 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 1428 ret = -EFAULT; 1429 kfree(proc); 1430 out: 1431 return ret; 1432 } 1433 1434 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 1435 { 1436 struct kvm_s390_vm_cpu_machine *mach; 1437 int ret = 0; 1438 1439 mach = kzalloc(sizeof(*mach), GFP_KERNEL); 1440 if (!mach) { 1441 ret = -ENOMEM; 1442 goto out; 1443 } 1444 get_cpu_id((struct cpuid *) &mach->cpuid); 1445 mach->ibc = sclp.ibc; 1446 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, 1447 S390_ARCH_FAC_LIST_SIZE_BYTE); 1448 memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list, 1449 sizeof(S390_lowcore.stfle_fac_list)); 1450 VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx", 1451 kvm->arch.model.ibc, 1452 kvm->arch.model.cpuid); 1453 VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx", 1454 mach->fac_mask[0], 1455 mach->fac_mask[1], 1456 mach->fac_mask[2]); 1457 VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1458 mach->fac_list[0], 1459 mach->fac_list[1], 1460 mach->fac_list[2]); 1461 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 1462 ret = -EFAULT; 1463 kfree(mach); 1464 out: 1465 return ret; 1466 } 1467 1468 static int kvm_s390_get_processor_feat(struct kvm *kvm, 1469 struct kvm_device_attr *attr) 1470 { 1471 struct kvm_s390_vm_cpu_feat data; 1472 1473 bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat, 1474 KVM_S390_VM_CPU_FEAT_NR_BITS); 1475 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1476 return -EFAULT; 1477 VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1478 data.feat[0], 1479 data.feat[1], 1480 data.feat[2]); 1481 return 0; 1482 } 1483 1484 static int kvm_s390_get_machine_feat(struct kvm *kvm, 1485 struct kvm_device_attr *attr) 1486 { 1487 struct kvm_s390_vm_cpu_feat data; 1488 1489 bitmap_copy((unsigned long *) data.feat, 1490 kvm_s390_available_cpu_feat, 1491 KVM_S390_VM_CPU_FEAT_NR_BITS); 1492 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1493 return -EFAULT; 1494 VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1495 data.feat[0], 1496 data.feat[1], 1497 data.feat[2]); 1498 return 0; 1499 } 1500 1501 static int kvm_s390_get_processor_subfunc(struct kvm *kvm, 1502 struct kvm_device_attr *attr) 1503 { 1504 if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs, 1505 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1506 return -EFAULT; 1507 1508 VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1509 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1510 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1511 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1512 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1513 VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1514 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1515 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1516 VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1517 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1518 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1519 VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1520 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1521 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1522 VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx", 1523 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1524 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1525 VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1526 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1527 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1528 VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1529 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1530 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1531 VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1532 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1533 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1534 VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1535 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1536 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1537 VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1538 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1539 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1540 VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1541 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1542 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1543 VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1544 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1545 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1546 VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1547 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1548 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1549 VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1550 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1551 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1552 VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1553 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1554 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1555 VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1556 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1557 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1558 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1559 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1560 VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1561 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1562 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1563 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1564 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1565 1566 return 0; 1567 } 1568 1569 static int kvm_s390_get_machine_subfunc(struct kvm *kvm, 1570 struct kvm_device_attr *attr) 1571 { 1572 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, 1573 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1574 return -EFAULT; 1575 1576 VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1577 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0], 1578 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1], 1579 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2], 1580 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]); 1581 VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx", 1582 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0], 1583 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]); 1584 VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx", 1585 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0], 1586 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]); 1587 VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx", 1588 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0], 1589 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]); 1590 VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx", 1591 ((unsigned long *) &kvm_s390_available_subfunc.km)[0], 1592 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]); 1593 VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx", 1594 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0], 1595 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]); 1596 VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx", 1597 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0], 1598 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]); 1599 VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx", 1600 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0], 1601 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]); 1602 VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx", 1603 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0], 1604 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]); 1605 VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx", 1606 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0], 1607 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]); 1608 VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx", 1609 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0], 1610 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]); 1611 VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx", 1612 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0], 1613 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]); 1614 VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx", 1615 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0], 1616 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]); 1617 VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx", 1618 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0], 1619 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]); 1620 VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx", 1621 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0], 1622 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]); 1623 VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1624 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0], 1625 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1], 1626 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2], 1627 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]); 1628 VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1629 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0], 1630 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1], 1631 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2], 1632 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]); 1633 1634 return 0; 1635 } 1636 1637 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1638 { 1639 int ret = -ENXIO; 1640 1641 switch (attr->attr) { 1642 case KVM_S390_VM_CPU_PROCESSOR: 1643 ret = kvm_s390_get_processor(kvm, attr); 1644 break; 1645 case KVM_S390_VM_CPU_MACHINE: 1646 ret = kvm_s390_get_machine(kvm, attr); 1647 break; 1648 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1649 ret = kvm_s390_get_processor_feat(kvm, attr); 1650 break; 1651 case KVM_S390_VM_CPU_MACHINE_FEAT: 1652 ret = kvm_s390_get_machine_feat(kvm, attr); 1653 break; 1654 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1655 ret = kvm_s390_get_processor_subfunc(kvm, attr); 1656 break; 1657 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1658 ret = kvm_s390_get_machine_subfunc(kvm, attr); 1659 break; 1660 } 1661 return ret; 1662 } 1663 1664 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1665 { 1666 int ret; 1667 1668 switch (attr->group) { 1669 case KVM_S390_VM_MEM_CTRL: 1670 ret = kvm_s390_set_mem_control(kvm, attr); 1671 break; 1672 case KVM_S390_VM_TOD: 1673 ret = kvm_s390_set_tod(kvm, attr); 1674 break; 1675 case KVM_S390_VM_CPU_MODEL: 1676 ret = kvm_s390_set_cpu_model(kvm, attr); 1677 break; 1678 case KVM_S390_VM_CRYPTO: 1679 ret = kvm_s390_vm_set_crypto(kvm, attr); 1680 break; 1681 case KVM_S390_VM_MIGRATION: 1682 ret = kvm_s390_vm_set_migration(kvm, attr); 1683 break; 1684 default: 1685 ret = -ENXIO; 1686 break; 1687 } 1688 1689 return ret; 1690 } 1691 1692 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1693 { 1694 int ret; 1695 1696 switch (attr->group) { 1697 case KVM_S390_VM_MEM_CTRL: 1698 ret = kvm_s390_get_mem_control(kvm, attr); 1699 break; 1700 case KVM_S390_VM_TOD: 1701 ret = kvm_s390_get_tod(kvm, attr); 1702 break; 1703 case KVM_S390_VM_CPU_MODEL: 1704 ret = kvm_s390_get_cpu_model(kvm, attr); 1705 break; 1706 case KVM_S390_VM_MIGRATION: 1707 ret = kvm_s390_vm_get_migration(kvm, attr); 1708 break; 1709 default: 1710 ret = -ENXIO; 1711 break; 1712 } 1713 1714 return ret; 1715 } 1716 1717 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1718 { 1719 int ret; 1720 1721 switch (attr->group) { 1722 case KVM_S390_VM_MEM_CTRL: 1723 switch (attr->attr) { 1724 case KVM_S390_VM_MEM_ENABLE_CMMA: 1725 case KVM_S390_VM_MEM_CLR_CMMA: 1726 ret = sclp.has_cmma ? 0 : -ENXIO; 1727 break; 1728 case KVM_S390_VM_MEM_LIMIT_SIZE: 1729 ret = 0; 1730 break; 1731 default: 1732 ret = -ENXIO; 1733 break; 1734 } 1735 break; 1736 case KVM_S390_VM_TOD: 1737 switch (attr->attr) { 1738 case KVM_S390_VM_TOD_LOW: 1739 case KVM_S390_VM_TOD_HIGH: 1740 ret = 0; 1741 break; 1742 default: 1743 ret = -ENXIO; 1744 break; 1745 } 1746 break; 1747 case KVM_S390_VM_CPU_MODEL: 1748 switch (attr->attr) { 1749 case KVM_S390_VM_CPU_PROCESSOR: 1750 case KVM_S390_VM_CPU_MACHINE: 1751 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1752 case KVM_S390_VM_CPU_MACHINE_FEAT: 1753 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1754 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1755 ret = 0; 1756 break; 1757 default: 1758 ret = -ENXIO; 1759 break; 1760 } 1761 break; 1762 case KVM_S390_VM_CRYPTO: 1763 switch (attr->attr) { 1764 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 1765 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 1766 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 1767 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 1768 ret = 0; 1769 break; 1770 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 1771 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 1772 ret = ap_instructions_available() ? 0 : -ENXIO; 1773 break; 1774 default: 1775 ret = -ENXIO; 1776 break; 1777 } 1778 break; 1779 case KVM_S390_VM_MIGRATION: 1780 ret = 0; 1781 break; 1782 default: 1783 ret = -ENXIO; 1784 break; 1785 } 1786 1787 return ret; 1788 } 1789 1790 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 1791 { 1792 uint8_t *keys; 1793 uint64_t hva; 1794 int srcu_idx, i, r = 0; 1795 1796 if (args->flags != 0) 1797 return -EINVAL; 1798 1799 /* Is this guest using storage keys? */ 1800 if (!mm_uses_skeys(current->mm)) 1801 return KVM_S390_GET_SKEYS_NONE; 1802 1803 /* Enforce sane limit on memory allocation */ 1804 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 1805 return -EINVAL; 1806 1807 keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL); 1808 if (!keys) 1809 return -ENOMEM; 1810 1811 down_read(¤t->mm->mmap_sem); 1812 srcu_idx = srcu_read_lock(&kvm->srcu); 1813 for (i = 0; i < args->count; i++) { 1814 hva = gfn_to_hva(kvm, args->start_gfn + i); 1815 if (kvm_is_error_hva(hva)) { 1816 r = -EFAULT; 1817 break; 1818 } 1819 1820 r = get_guest_storage_key(current->mm, hva, &keys[i]); 1821 if (r) 1822 break; 1823 } 1824 srcu_read_unlock(&kvm->srcu, srcu_idx); 1825 up_read(¤t->mm->mmap_sem); 1826 1827 if (!r) { 1828 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 1829 sizeof(uint8_t) * args->count); 1830 if (r) 1831 r = -EFAULT; 1832 } 1833 1834 kvfree(keys); 1835 return r; 1836 } 1837 1838 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 1839 { 1840 uint8_t *keys; 1841 uint64_t hva; 1842 int srcu_idx, i, r = 0; 1843 bool unlocked; 1844 1845 if (args->flags != 0) 1846 return -EINVAL; 1847 1848 /* Enforce sane limit on memory allocation */ 1849 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 1850 return -EINVAL; 1851 1852 keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL); 1853 if (!keys) 1854 return -ENOMEM; 1855 1856 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 1857 sizeof(uint8_t) * args->count); 1858 if (r) { 1859 r = -EFAULT; 1860 goto out; 1861 } 1862 1863 /* Enable storage key handling for the guest */ 1864 r = s390_enable_skey(); 1865 if (r) 1866 goto out; 1867 1868 i = 0; 1869 down_read(¤t->mm->mmap_sem); 1870 srcu_idx = srcu_read_lock(&kvm->srcu); 1871 while (i < args->count) { 1872 unlocked = false; 1873 hva = gfn_to_hva(kvm, args->start_gfn + i); 1874 if (kvm_is_error_hva(hva)) { 1875 r = -EFAULT; 1876 break; 1877 } 1878 1879 /* Lowest order bit is reserved */ 1880 if (keys[i] & 0x01) { 1881 r = -EINVAL; 1882 break; 1883 } 1884 1885 r = set_guest_storage_key(current->mm, hva, keys[i], 0); 1886 if (r) { 1887 r = fixup_user_fault(current, current->mm, hva, 1888 FAULT_FLAG_WRITE, &unlocked); 1889 if (r) 1890 break; 1891 } 1892 if (!r) 1893 i++; 1894 } 1895 srcu_read_unlock(&kvm->srcu, srcu_idx); 1896 up_read(¤t->mm->mmap_sem); 1897 out: 1898 kvfree(keys); 1899 return r; 1900 } 1901 1902 /* 1903 * Base address and length must be sent at the start of each block, therefore 1904 * it's cheaper to send some clean data, as long as it's less than the size of 1905 * two longs. 1906 */ 1907 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *)) 1908 /* for consistency */ 1909 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX) 1910 1911 /* 1912 * Similar to gfn_to_memslot, but returns the index of a memslot also when the 1913 * address falls in a hole. In that case the index of one of the memslots 1914 * bordering the hole is returned. 1915 */ 1916 static int gfn_to_memslot_approx(struct kvm_memslots *slots, gfn_t gfn) 1917 { 1918 int start = 0, end = slots->used_slots; 1919 int slot = atomic_read(&slots->lru_slot); 1920 struct kvm_memory_slot *memslots = slots->memslots; 1921 1922 if (gfn >= memslots[slot].base_gfn && 1923 gfn < memslots[slot].base_gfn + memslots[slot].npages) 1924 return slot; 1925 1926 while (start < end) { 1927 slot = start + (end - start) / 2; 1928 1929 if (gfn >= memslots[slot].base_gfn) 1930 end = slot; 1931 else 1932 start = slot + 1; 1933 } 1934 1935 if (gfn >= memslots[start].base_gfn && 1936 gfn < memslots[start].base_gfn + memslots[start].npages) { 1937 atomic_set(&slots->lru_slot, start); 1938 } 1939 1940 return start; 1941 } 1942 1943 static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, 1944 u8 *res, unsigned long bufsize) 1945 { 1946 unsigned long pgstev, hva, cur_gfn = args->start_gfn; 1947 1948 args->count = 0; 1949 while (args->count < bufsize) { 1950 hva = gfn_to_hva(kvm, cur_gfn); 1951 /* 1952 * We return an error if the first value was invalid, but we 1953 * return successfully if at least one value was copied. 1954 */ 1955 if (kvm_is_error_hva(hva)) 1956 return args->count ? 0 : -EFAULT; 1957 if (get_pgste(kvm->mm, hva, &pgstev) < 0) 1958 pgstev = 0; 1959 res[args->count++] = (pgstev >> 24) & 0x43; 1960 cur_gfn++; 1961 } 1962 1963 return 0; 1964 } 1965 1966 static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots, 1967 unsigned long cur_gfn) 1968 { 1969 int slotidx = gfn_to_memslot_approx(slots, cur_gfn); 1970 struct kvm_memory_slot *ms = slots->memslots + slotidx; 1971 unsigned long ofs = cur_gfn - ms->base_gfn; 1972 1973 if (ms->base_gfn + ms->npages <= cur_gfn) { 1974 slotidx--; 1975 /* If we are above the highest slot, wrap around */ 1976 if (slotidx < 0) 1977 slotidx = slots->used_slots - 1; 1978 1979 ms = slots->memslots + slotidx; 1980 ofs = 0; 1981 } 1982 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs); 1983 while ((slotidx > 0) && (ofs >= ms->npages)) { 1984 slotidx--; 1985 ms = slots->memslots + slotidx; 1986 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, 0); 1987 } 1988 return ms->base_gfn + ofs; 1989 } 1990 1991 static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, 1992 u8 *res, unsigned long bufsize) 1993 { 1994 unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev; 1995 struct kvm_memslots *slots = kvm_memslots(kvm); 1996 struct kvm_memory_slot *ms; 1997 1998 cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn); 1999 ms = gfn_to_memslot(kvm, cur_gfn); 2000 args->count = 0; 2001 args->start_gfn = cur_gfn; 2002 if (!ms) 2003 return 0; 2004 next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); 2005 mem_end = slots->memslots[0].base_gfn + slots->memslots[0].npages; 2006 2007 while (args->count < bufsize) { 2008 hva = gfn_to_hva(kvm, cur_gfn); 2009 if (kvm_is_error_hva(hva)) 2010 return 0; 2011 /* Decrement only if we actually flipped the bit to 0 */ 2012 if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 2013 atomic64_dec(&kvm->arch.cmma_dirty_pages); 2014 if (get_pgste(kvm->mm, hva, &pgstev) < 0) 2015 pgstev = 0; 2016 /* Save the value */ 2017 res[args->count++] = (pgstev >> 24) & 0x43; 2018 /* If the next bit is too far away, stop. */ 2019 if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE) 2020 return 0; 2021 /* If we reached the previous "next", find the next one */ 2022 if (cur_gfn == next_gfn) 2023 next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); 2024 /* Reached the end of memory or of the buffer, stop */ 2025 if ((next_gfn >= mem_end) || 2026 (next_gfn - args->start_gfn >= bufsize)) 2027 return 0; 2028 cur_gfn++; 2029 /* Reached the end of the current memslot, take the next one. */ 2030 if (cur_gfn - ms->base_gfn >= ms->npages) { 2031 ms = gfn_to_memslot(kvm, cur_gfn); 2032 if (!ms) 2033 return 0; 2034 } 2035 } 2036 return 0; 2037 } 2038 2039 /* 2040 * This function searches for the next page with dirty CMMA attributes, and 2041 * saves the attributes in the buffer up to either the end of the buffer or 2042 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found; 2043 * no trailing clean bytes are saved. 2044 * In case no dirty bits were found, or if CMMA was not enabled or used, the 2045 * output buffer will indicate 0 as length. 2046 */ 2047 static int kvm_s390_get_cmma_bits(struct kvm *kvm, 2048 struct kvm_s390_cmma_log *args) 2049 { 2050 unsigned long bufsize; 2051 int srcu_idx, peek, ret; 2052 u8 *values; 2053 2054 if (!kvm->arch.use_cmma) 2055 return -ENXIO; 2056 /* Invalid/unsupported flags were specified */ 2057 if (args->flags & ~KVM_S390_CMMA_PEEK) 2058 return -EINVAL; 2059 /* Migration mode query, and we are not doing a migration */ 2060 peek = !!(args->flags & KVM_S390_CMMA_PEEK); 2061 if (!peek && !kvm->arch.migration_mode) 2062 return -EINVAL; 2063 /* CMMA is disabled or was not used, or the buffer has length zero */ 2064 bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX); 2065 if (!bufsize || !kvm->mm->context.uses_cmm) { 2066 memset(args, 0, sizeof(*args)); 2067 return 0; 2068 } 2069 /* We are not peeking, and there are no dirty pages */ 2070 if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) { 2071 memset(args, 0, sizeof(*args)); 2072 return 0; 2073 } 2074 2075 values = vmalloc(bufsize); 2076 if (!values) 2077 return -ENOMEM; 2078 2079 down_read(&kvm->mm->mmap_sem); 2080 srcu_idx = srcu_read_lock(&kvm->srcu); 2081 if (peek) 2082 ret = kvm_s390_peek_cmma(kvm, args, values, bufsize); 2083 else 2084 ret = kvm_s390_get_cmma(kvm, args, values, bufsize); 2085 srcu_read_unlock(&kvm->srcu, srcu_idx); 2086 up_read(&kvm->mm->mmap_sem); 2087 2088 if (kvm->arch.migration_mode) 2089 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages); 2090 else 2091 args->remaining = 0; 2092 2093 if (copy_to_user((void __user *)args->values, values, args->count)) 2094 ret = -EFAULT; 2095 2096 vfree(values); 2097 return ret; 2098 } 2099 2100 /* 2101 * This function sets the CMMA attributes for the given pages. If the input 2102 * buffer has zero length, no action is taken, otherwise the attributes are 2103 * set and the mm->context.uses_cmm flag is set. 2104 */ 2105 static int kvm_s390_set_cmma_bits(struct kvm *kvm, 2106 const struct kvm_s390_cmma_log *args) 2107 { 2108 unsigned long hva, mask, pgstev, i; 2109 uint8_t *bits; 2110 int srcu_idx, r = 0; 2111 2112 mask = args->mask; 2113 2114 if (!kvm->arch.use_cmma) 2115 return -ENXIO; 2116 /* invalid/unsupported flags */ 2117 if (args->flags != 0) 2118 return -EINVAL; 2119 /* Enforce sane limit on memory allocation */ 2120 if (args->count > KVM_S390_CMMA_SIZE_MAX) 2121 return -EINVAL; 2122 /* Nothing to do */ 2123 if (args->count == 0) 2124 return 0; 2125 2126 bits = vmalloc(array_size(sizeof(*bits), args->count)); 2127 if (!bits) 2128 return -ENOMEM; 2129 2130 r = copy_from_user(bits, (void __user *)args->values, args->count); 2131 if (r) { 2132 r = -EFAULT; 2133 goto out; 2134 } 2135 2136 down_read(&kvm->mm->mmap_sem); 2137 srcu_idx = srcu_read_lock(&kvm->srcu); 2138 for (i = 0; i < args->count; i++) { 2139 hva = gfn_to_hva(kvm, args->start_gfn + i); 2140 if (kvm_is_error_hva(hva)) { 2141 r = -EFAULT; 2142 break; 2143 } 2144 2145 pgstev = bits[i]; 2146 pgstev = pgstev << 24; 2147 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT; 2148 set_pgste_bits(kvm->mm, hva, mask, pgstev); 2149 } 2150 srcu_read_unlock(&kvm->srcu, srcu_idx); 2151 up_read(&kvm->mm->mmap_sem); 2152 2153 if (!kvm->mm->context.uses_cmm) { 2154 down_write(&kvm->mm->mmap_sem); 2155 kvm->mm->context.uses_cmm = 1; 2156 up_write(&kvm->mm->mmap_sem); 2157 } 2158 out: 2159 vfree(bits); 2160 return r; 2161 } 2162 2163 long kvm_arch_vm_ioctl(struct file *filp, 2164 unsigned int ioctl, unsigned long arg) 2165 { 2166 struct kvm *kvm = filp->private_data; 2167 void __user *argp = (void __user *)arg; 2168 struct kvm_device_attr attr; 2169 int r; 2170 2171 switch (ioctl) { 2172 case KVM_S390_INTERRUPT: { 2173 struct kvm_s390_interrupt s390int; 2174 2175 r = -EFAULT; 2176 if (copy_from_user(&s390int, argp, sizeof(s390int))) 2177 break; 2178 r = kvm_s390_inject_vm(kvm, &s390int); 2179 break; 2180 } 2181 case KVM_CREATE_IRQCHIP: { 2182 struct kvm_irq_routing_entry routing; 2183 2184 r = -EINVAL; 2185 if (kvm->arch.use_irqchip) { 2186 /* Set up dummy routing. */ 2187 memset(&routing, 0, sizeof(routing)); 2188 r = kvm_set_irq_routing(kvm, &routing, 0, 0); 2189 } 2190 break; 2191 } 2192 case KVM_SET_DEVICE_ATTR: { 2193 r = -EFAULT; 2194 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2195 break; 2196 r = kvm_s390_vm_set_attr(kvm, &attr); 2197 break; 2198 } 2199 case KVM_GET_DEVICE_ATTR: { 2200 r = -EFAULT; 2201 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2202 break; 2203 r = kvm_s390_vm_get_attr(kvm, &attr); 2204 break; 2205 } 2206 case KVM_HAS_DEVICE_ATTR: { 2207 r = -EFAULT; 2208 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2209 break; 2210 r = kvm_s390_vm_has_attr(kvm, &attr); 2211 break; 2212 } 2213 case KVM_S390_GET_SKEYS: { 2214 struct kvm_s390_skeys args; 2215 2216 r = -EFAULT; 2217 if (copy_from_user(&args, argp, 2218 sizeof(struct kvm_s390_skeys))) 2219 break; 2220 r = kvm_s390_get_skeys(kvm, &args); 2221 break; 2222 } 2223 case KVM_S390_SET_SKEYS: { 2224 struct kvm_s390_skeys args; 2225 2226 r = -EFAULT; 2227 if (copy_from_user(&args, argp, 2228 sizeof(struct kvm_s390_skeys))) 2229 break; 2230 r = kvm_s390_set_skeys(kvm, &args); 2231 break; 2232 } 2233 case KVM_S390_GET_CMMA_BITS: { 2234 struct kvm_s390_cmma_log args; 2235 2236 r = -EFAULT; 2237 if (copy_from_user(&args, argp, sizeof(args))) 2238 break; 2239 mutex_lock(&kvm->slots_lock); 2240 r = kvm_s390_get_cmma_bits(kvm, &args); 2241 mutex_unlock(&kvm->slots_lock); 2242 if (!r) { 2243 r = copy_to_user(argp, &args, sizeof(args)); 2244 if (r) 2245 r = -EFAULT; 2246 } 2247 break; 2248 } 2249 case KVM_S390_SET_CMMA_BITS: { 2250 struct kvm_s390_cmma_log args; 2251 2252 r = -EFAULT; 2253 if (copy_from_user(&args, argp, sizeof(args))) 2254 break; 2255 mutex_lock(&kvm->slots_lock); 2256 r = kvm_s390_set_cmma_bits(kvm, &args); 2257 mutex_unlock(&kvm->slots_lock); 2258 break; 2259 } 2260 default: 2261 r = -ENOTTY; 2262 } 2263 2264 return r; 2265 } 2266 2267 static int kvm_s390_apxa_installed(void) 2268 { 2269 struct ap_config_info info; 2270 2271 if (ap_instructions_available()) { 2272 if (ap_qci(&info) == 0) 2273 return info.apxa; 2274 } 2275 2276 return 0; 2277 } 2278 2279 /* 2280 * The format of the crypto control block (CRYCB) is specified in the 3 low 2281 * order bits of the CRYCB designation (CRYCBD) field as follows: 2282 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the 2283 * AP extended addressing (APXA) facility are installed. 2284 * Format 1: The APXA facility is not installed but the MSAX3 facility is. 2285 * Format 2: Both the APXA and MSAX3 facilities are installed 2286 */ 2287 static void kvm_s390_set_crycb_format(struct kvm *kvm) 2288 { 2289 kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb; 2290 2291 /* Clear the CRYCB format bits - i.e., set format 0 by default */ 2292 kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK); 2293 2294 /* Check whether MSAX3 is installed */ 2295 if (!test_kvm_facility(kvm, 76)) 2296 return; 2297 2298 if (kvm_s390_apxa_installed()) 2299 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 2300 else 2301 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 2302 } 2303 2304 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, 2305 unsigned long *aqm, unsigned long *adm) 2306 { 2307 struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb; 2308 2309 mutex_lock(&kvm->lock); 2310 kvm_s390_vcpu_block_all(kvm); 2311 2312 switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { 2313 case CRYCB_FORMAT2: /* APCB1 use 256 bits */ 2314 memcpy(crycb->apcb1.apm, apm, 32); 2315 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx", 2316 apm[0], apm[1], apm[2], apm[3]); 2317 memcpy(crycb->apcb1.aqm, aqm, 32); 2318 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx", 2319 aqm[0], aqm[1], aqm[2], aqm[3]); 2320 memcpy(crycb->apcb1.adm, adm, 32); 2321 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx", 2322 adm[0], adm[1], adm[2], adm[3]); 2323 break; 2324 case CRYCB_FORMAT1: 2325 case CRYCB_FORMAT0: /* Fall through both use APCB0 */ 2326 memcpy(crycb->apcb0.apm, apm, 8); 2327 memcpy(crycb->apcb0.aqm, aqm, 2); 2328 memcpy(crycb->apcb0.adm, adm, 2); 2329 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x", 2330 apm[0], *((unsigned short *)aqm), 2331 *((unsigned short *)adm)); 2332 break; 2333 default: /* Can not happen */ 2334 break; 2335 } 2336 2337 /* recreate the shadow crycb for each vcpu */ 2338 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 2339 kvm_s390_vcpu_unblock_all(kvm); 2340 mutex_unlock(&kvm->lock); 2341 } 2342 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks); 2343 2344 void kvm_arch_crypto_clear_masks(struct kvm *kvm) 2345 { 2346 mutex_lock(&kvm->lock); 2347 kvm_s390_vcpu_block_all(kvm); 2348 2349 memset(&kvm->arch.crypto.crycb->apcb0, 0, 2350 sizeof(kvm->arch.crypto.crycb->apcb0)); 2351 memset(&kvm->arch.crypto.crycb->apcb1, 0, 2352 sizeof(kvm->arch.crypto.crycb->apcb1)); 2353 2354 VM_EVENT(kvm, 3, "%s", "CLR CRYCB:"); 2355 /* recreate the shadow crycb for each vcpu */ 2356 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 2357 kvm_s390_vcpu_unblock_all(kvm); 2358 mutex_unlock(&kvm->lock); 2359 } 2360 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks); 2361 2362 static u64 kvm_s390_get_initial_cpuid(void) 2363 { 2364 struct cpuid cpuid; 2365 2366 get_cpu_id(&cpuid); 2367 cpuid.version = 0xff; 2368 return *((u64 *) &cpuid); 2369 } 2370 2371 static void kvm_s390_crypto_init(struct kvm *kvm) 2372 { 2373 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; 2374 kvm_s390_set_crycb_format(kvm); 2375 2376 if (!test_kvm_facility(kvm, 76)) 2377 return; 2378 2379 /* Enable AES/DEA protected key functions by default */ 2380 kvm->arch.crypto.aes_kw = 1; 2381 kvm->arch.crypto.dea_kw = 1; 2382 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 2383 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 2384 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 2385 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 2386 } 2387 2388 static void sca_dispose(struct kvm *kvm) 2389 { 2390 if (kvm->arch.use_esca) 2391 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block)); 2392 else 2393 free_page((unsigned long)(kvm->arch.sca)); 2394 kvm->arch.sca = NULL; 2395 } 2396 2397 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 2398 { 2399 gfp_t alloc_flags = GFP_KERNEL; 2400 int i, rc; 2401 char debug_name[16]; 2402 static unsigned long sca_offset; 2403 2404 rc = -EINVAL; 2405 #ifdef CONFIG_KVM_S390_UCONTROL 2406 if (type & ~KVM_VM_S390_UCONTROL) 2407 goto out_err; 2408 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 2409 goto out_err; 2410 #else 2411 if (type) 2412 goto out_err; 2413 #endif 2414 2415 rc = s390_enable_sie(); 2416 if (rc) 2417 goto out_err; 2418 2419 rc = -ENOMEM; 2420 2421 if (!sclp.has_64bscao) 2422 alloc_flags |= GFP_DMA; 2423 rwlock_init(&kvm->arch.sca_lock); 2424 /* start with basic SCA */ 2425 kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags); 2426 if (!kvm->arch.sca) 2427 goto out_err; 2428 mutex_lock(&kvm_lock); 2429 sca_offset += 16; 2430 if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE) 2431 sca_offset = 0; 2432 kvm->arch.sca = (struct bsca_block *) 2433 ((char *) kvm->arch.sca + sca_offset); 2434 mutex_unlock(&kvm_lock); 2435 2436 sprintf(debug_name, "kvm-%u", current->pid); 2437 2438 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 2439 if (!kvm->arch.dbf) 2440 goto out_err; 2441 2442 BUILD_BUG_ON(sizeof(struct sie_page2) != 4096); 2443 kvm->arch.sie_page2 = 2444 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 2445 if (!kvm->arch.sie_page2) 2446 goto out_err; 2447 2448 kvm->arch.sie_page2->kvm = kvm; 2449 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; 2450 2451 for (i = 0; i < kvm_s390_fac_size(); i++) { 2452 kvm->arch.model.fac_mask[i] = S390_lowcore.stfle_fac_list[i] & 2453 (kvm_s390_fac_base[i] | 2454 kvm_s390_fac_ext[i]); 2455 kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] & 2456 kvm_s390_fac_base[i]; 2457 } 2458 kvm->arch.model.subfuncs = kvm_s390_available_subfunc; 2459 2460 /* we are always in czam mode - even on pre z14 machines */ 2461 set_kvm_facility(kvm->arch.model.fac_mask, 138); 2462 set_kvm_facility(kvm->arch.model.fac_list, 138); 2463 /* we emulate STHYI in kvm */ 2464 set_kvm_facility(kvm->arch.model.fac_mask, 74); 2465 set_kvm_facility(kvm->arch.model.fac_list, 74); 2466 if (MACHINE_HAS_TLB_GUEST) { 2467 set_kvm_facility(kvm->arch.model.fac_mask, 147); 2468 set_kvm_facility(kvm->arch.model.fac_list, 147); 2469 } 2470 2471 if (css_general_characteristics.aiv && test_facility(65)) 2472 set_kvm_facility(kvm->arch.model.fac_mask, 65); 2473 2474 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); 2475 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 2476 2477 kvm_s390_crypto_init(kvm); 2478 2479 mutex_init(&kvm->arch.float_int.ais_lock); 2480 spin_lock_init(&kvm->arch.float_int.lock); 2481 for (i = 0; i < FIRQ_LIST_COUNT; i++) 2482 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 2483 init_waitqueue_head(&kvm->arch.ipte_wq); 2484 mutex_init(&kvm->arch.ipte_mutex); 2485 2486 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 2487 VM_EVENT(kvm, 3, "vm created with type %lu", type); 2488 2489 if (type & KVM_VM_S390_UCONTROL) { 2490 kvm->arch.gmap = NULL; 2491 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT; 2492 } else { 2493 if (sclp.hamax == U64_MAX) 2494 kvm->arch.mem_limit = TASK_SIZE_MAX; 2495 else 2496 kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX, 2497 sclp.hamax + 1); 2498 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1); 2499 if (!kvm->arch.gmap) 2500 goto out_err; 2501 kvm->arch.gmap->private = kvm; 2502 kvm->arch.gmap->pfault_enabled = 0; 2503 } 2504 2505 kvm->arch.use_pfmfi = sclp.has_pfmfi; 2506 kvm->arch.use_skf = sclp.has_skey; 2507 spin_lock_init(&kvm->arch.start_stop_lock); 2508 kvm_s390_vsie_init(kvm); 2509 kvm_s390_gisa_init(kvm); 2510 KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid); 2511 2512 return 0; 2513 out_err: 2514 free_page((unsigned long)kvm->arch.sie_page2); 2515 debug_unregister(kvm->arch.dbf); 2516 sca_dispose(kvm); 2517 KVM_EVENT(3, "creation of vm failed: %d", rc); 2518 return rc; 2519 } 2520 2521 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 2522 { 2523 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 2524 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 2525 kvm_s390_clear_local_irqs(vcpu); 2526 kvm_clear_async_pf_completion_queue(vcpu); 2527 if (!kvm_is_ucontrol(vcpu->kvm)) 2528 sca_del_vcpu(vcpu); 2529 2530 if (kvm_is_ucontrol(vcpu->kvm)) 2531 gmap_remove(vcpu->arch.gmap); 2532 2533 if (vcpu->kvm->arch.use_cmma) 2534 kvm_s390_vcpu_unsetup_cmma(vcpu); 2535 free_page((unsigned long)(vcpu->arch.sie_block)); 2536 2537 kvm_vcpu_uninit(vcpu); 2538 kmem_cache_free(kvm_vcpu_cache, vcpu); 2539 } 2540 2541 static void kvm_free_vcpus(struct kvm *kvm) 2542 { 2543 unsigned int i; 2544 struct kvm_vcpu *vcpu; 2545 2546 kvm_for_each_vcpu(i, vcpu, kvm) 2547 kvm_arch_vcpu_destroy(vcpu); 2548 2549 mutex_lock(&kvm->lock); 2550 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 2551 kvm->vcpus[i] = NULL; 2552 2553 atomic_set(&kvm->online_vcpus, 0); 2554 mutex_unlock(&kvm->lock); 2555 } 2556 2557 void kvm_arch_destroy_vm(struct kvm *kvm) 2558 { 2559 kvm_free_vcpus(kvm); 2560 sca_dispose(kvm); 2561 debug_unregister(kvm->arch.dbf); 2562 kvm_s390_gisa_destroy(kvm); 2563 free_page((unsigned long)kvm->arch.sie_page2); 2564 if (!kvm_is_ucontrol(kvm)) 2565 gmap_remove(kvm->arch.gmap); 2566 kvm_s390_destroy_adapters(kvm); 2567 kvm_s390_clear_float_irqs(kvm); 2568 kvm_s390_vsie_destroy(kvm); 2569 KVM_EVENT(3, "vm 0x%pK destroyed", kvm); 2570 } 2571 2572 /* Section: vcpu related */ 2573 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) 2574 { 2575 vcpu->arch.gmap = gmap_create(current->mm, -1UL); 2576 if (!vcpu->arch.gmap) 2577 return -ENOMEM; 2578 vcpu->arch.gmap->private = vcpu->kvm; 2579 2580 return 0; 2581 } 2582 2583 static void sca_del_vcpu(struct kvm_vcpu *vcpu) 2584 { 2585 if (!kvm_s390_use_sca_entries()) 2586 return; 2587 read_lock(&vcpu->kvm->arch.sca_lock); 2588 if (vcpu->kvm->arch.use_esca) { 2589 struct esca_block *sca = vcpu->kvm->arch.sca; 2590 2591 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); 2592 sca->cpu[vcpu->vcpu_id].sda = 0; 2593 } else { 2594 struct bsca_block *sca = vcpu->kvm->arch.sca; 2595 2596 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); 2597 sca->cpu[vcpu->vcpu_id].sda = 0; 2598 } 2599 read_unlock(&vcpu->kvm->arch.sca_lock); 2600 } 2601 2602 static void sca_add_vcpu(struct kvm_vcpu *vcpu) 2603 { 2604 if (!kvm_s390_use_sca_entries()) { 2605 struct bsca_block *sca = vcpu->kvm->arch.sca; 2606 2607 /* we still need the basic sca for the ipte control */ 2608 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 2609 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; 2610 return; 2611 } 2612 read_lock(&vcpu->kvm->arch.sca_lock); 2613 if (vcpu->kvm->arch.use_esca) { 2614 struct esca_block *sca = vcpu->kvm->arch.sca; 2615 2616 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; 2617 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 2618 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU; 2619 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 2620 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); 2621 } else { 2622 struct bsca_block *sca = vcpu->kvm->arch.sca; 2623 2624 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; 2625 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); 2626 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; 2627 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); 2628 } 2629 read_unlock(&vcpu->kvm->arch.sca_lock); 2630 } 2631 2632 /* Basic SCA to Extended SCA data copy routines */ 2633 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s) 2634 { 2635 d->sda = s->sda; 2636 d->sigp_ctrl.c = s->sigp_ctrl.c; 2637 d->sigp_ctrl.scn = s->sigp_ctrl.scn; 2638 } 2639 2640 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s) 2641 { 2642 int i; 2643 2644 d->ipte_control = s->ipte_control; 2645 d->mcn[0] = s->mcn; 2646 for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++) 2647 sca_copy_entry(&d->cpu[i], &s->cpu[i]); 2648 } 2649 2650 static int sca_switch_to_extended(struct kvm *kvm) 2651 { 2652 struct bsca_block *old_sca = kvm->arch.sca; 2653 struct esca_block *new_sca; 2654 struct kvm_vcpu *vcpu; 2655 unsigned int vcpu_idx; 2656 u32 scaol, scaoh; 2657 2658 new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO); 2659 if (!new_sca) 2660 return -ENOMEM; 2661 2662 scaoh = (u32)((u64)(new_sca) >> 32); 2663 scaol = (u32)(u64)(new_sca) & ~0x3fU; 2664 2665 kvm_s390_vcpu_block_all(kvm); 2666 write_lock(&kvm->arch.sca_lock); 2667 2668 sca_copy_b_to_e(new_sca, old_sca); 2669 2670 kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) { 2671 vcpu->arch.sie_block->scaoh = scaoh; 2672 vcpu->arch.sie_block->scaol = scaol; 2673 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 2674 } 2675 kvm->arch.sca = new_sca; 2676 kvm->arch.use_esca = 1; 2677 2678 write_unlock(&kvm->arch.sca_lock); 2679 kvm_s390_vcpu_unblock_all(kvm); 2680 2681 free_page((unsigned long)old_sca); 2682 2683 VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)", 2684 old_sca, kvm->arch.sca); 2685 return 0; 2686 } 2687 2688 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) 2689 { 2690 int rc; 2691 2692 if (!kvm_s390_use_sca_entries()) { 2693 if (id < KVM_MAX_VCPUS) 2694 return true; 2695 return false; 2696 } 2697 if (id < KVM_S390_BSCA_CPU_SLOTS) 2698 return true; 2699 if (!sclp.has_esca || !sclp.has_64bscao) 2700 return false; 2701 2702 mutex_lock(&kvm->lock); 2703 rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm); 2704 mutex_unlock(&kvm->lock); 2705 2706 return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS; 2707 } 2708 2709 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 2710 { 2711 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 2712 kvm_clear_async_pf_completion_queue(vcpu); 2713 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 2714 KVM_SYNC_GPRS | 2715 KVM_SYNC_ACRS | 2716 KVM_SYNC_CRS | 2717 KVM_SYNC_ARCH0 | 2718 KVM_SYNC_PFAULT; 2719 kvm_s390_set_prefix(vcpu, 0); 2720 if (test_kvm_facility(vcpu->kvm, 64)) 2721 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; 2722 if (test_kvm_facility(vcpu->kvm, 82)) 2723 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC; 2724 if (test_kvm_facility(vcpu->kvm, 133)) 2725 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB; 2726 if (test_kvm_facility(vcpu->kvm, 156)) 2727 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN; 2728 /* fprs can be synchronized via vrs, even if the guest has no vx. With 2729 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format. 2730 */ 2731 if (MACHINE_HAS_VX) 2732 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 2733 else 2734 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; 2735 2736 if (kvm_is_ucontrol(vcpu->kvm)) 2737 return __kvm_ucontrol_vcpu_init(vcpu); 2738 2739 return 0; 2740 } 2741 2742 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2743 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2744 { 2745 WARN_ON_ONCE(vcpu->arch.cputm_start != 0); 2746 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 2747 vcpu->arch.cputm_start = get_tod_clock_fast(); 2748 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 2749 } 2750 2751 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2752 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2753 { 2754 WARN_ON_ONCE(vcpu->arch.cputm_start == 0); 2755 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 2756 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; 2757 vcpu->arch.cputm_start = 0; 2758 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 2759 } 2760 2761 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2762 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2763 { 2764 WARN_ON_ONCE(vcpu->arch.cputm_enabled); 2765 vcpu->arch.cputm_enabled = true; 2766 __start_cpu_timer_accounting(vcpu); 2767 } 2768 2769 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 2770 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2771 { 2772 WARN_ON_ONCE(!vcpu->arch.cputm_enabled); 2773 __stop_cpu_timer_accounting(vcpu); 2774 vcpu->arch.cputm_enabled = false; 2775 } 2776 2777 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2778 { 2779 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2780 __enable_cpu_timer_accounting(vcpu); 2781 preempt_enable(); 2782 } 2783 2784 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 2785 { 2786 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2787 __disable_cpu_timer_accounting(vcpu); 2788 preempt_enable(); 2789 } 2790 2791 /* set the cpu timer - may only be called from the VCPU thread itself */ 2792 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) 2793 { 2794 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2795 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 2796 if (vcpu->arch.cputm_enabled) 2797 vcpu->arch.cputm_start = get_tod_clock_fast(); 2798 vcpu->arch.sie_block->cputm = cputm; 2799 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 2800 preempt_enable(); 2801 } 2802 2803 /* update and get the cpu timer - can also be called from other VCPU threads */ 2804 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) 2805 { 2806 unsigned int seq; 2807 __u64 value; 2808 2809 if (unlikely(!vcpu->arch.cputm_enabled)) 2810 return vcpu->arch.sie_block->cputm; 2811 2812 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 2813 do { 2814 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); 2815 /* 2816 * If the writer would ever execute a read in the critical 2817 * section, e.g. in irq context, we have a deadlock. 2818 */ 2819 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); 2820 value = vcpu->arch.sie_block->cputm; 2821 /* if cputm_start is 0, accounting is being started/stopped */ 2822 if (likely(vcpu->arch.cputm_start)) 2823 value -= get_tod_clock_fast() - vcpu->arch.cputm_start; 2824 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); 2825 preempt_enable(); 2826 return value; 2827 } 2828 2829 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 2830 { 2831 2832 gmap_enable(vcpu->arch.enabled_gmap); 2833 kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING); 2834 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 2835 __start_cpu_timer_accounting(vcpu); 2836 vcpu->cpu = cpu; 2837 } 2838 2839 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 2840 { 2841 vcpu->cpu = -1; 2842 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 2843 __stop_cpu_timer_accounting(vcpu); 2844 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING); 2845 vcpu->arch.enabled_gmap = gmap_get_enabled(); 2846 gmap_disable(vcpu->arch.enabled_gmap); 2847 2848 } 2849 2850 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) 2851 { 2852 /* this equals initial cpu reset in pop, but we don't switch to ESA */ 2853 vcpu->arch.sie_block->gpsw.mask = 0UL; 2854 vcpu->arch.sie_block->gpsw.addr = 0UL; 2855 kvm_s390_set_prefix(vcpu, 0); 2856 kvm_s390_set_cpu_timer(vcpu, 0); 2857 vcpu->arch.sie_block->ckc = 0UL; 2858 vcpu->arch.sie_block->todpr = 0; 2859 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); 2860 vcpu->arch.sie_block->gcr[0] = CR0_UNUSED_56 | 2861 CR0_INTERRUPT_KEY_SUBMASK | 2862 CR0_MEASUREMENT_ALERT_SUBMASK; 2863 vcpu->arch.sie_block->gcr[14] = CR14_UNUSED_32 | 2864 CR14_UNUSED_33 | 2865 CR14_EXTERNAL_DAMAGE_SUBMASK; 2866 /* make sure the new fpc will be lazily loaded */ 2867 save_fpu_regs(); 2868 current->thread.fpu.fpc = 0; 2869 vcpu->arch.sie_block->gbea = 1; 2870 vcpu->arch.sie_block->pp = 0; 2871 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 2872 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 2873 kvm_clear_async_pf_completion_queue(vcpu); 2874 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 2875 kvm_s390_vcpu_stop(vcpu); 2876 kvm_s390_clear_local_irqs(vcpu); 2877 } 2878 2879 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 2880 { 2881 mutex_lock(&vcpu->kvm->lock); 2882 preempt_disable(); 2883 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 2884 vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx; 2885 preempt_enable(); 2886 mutex_unlock(&vcpu->kvm->lock); 2887 if (!kvm_is_ucontrol(vcpu->kvm)) { 2888 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 2889 sca_add_vcpu(vcpu); 2890 } 2891 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0) 2892 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 2893 /* make vcpu_load load the right gmap on the first trigger */ 2894 vcpu->arch.enabled_gmap = vcpu->arch.gmap; 2895 } 2896 2897 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr) 2898 { 2899 if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) && 2900 test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo)) 2901 return true; 2902 return false; 2903 } 2904 2905 static bool kvm_has_pckmo_ecc(struct kvm *kvm) 2906 { 2907 /* At least one ECC subfunction must be present */ 2908 return kvm_has_pckmo_subfunc(kvm, 32) || 2909 kvm_has_pckmo_subfunc(kvm, 33) || 2910 kvm_has_pckmo_subfunc(kvm, 34) || 2911 kvm_has_pckmo_subfunc(kvm, 40) || 2912 kvm_has_pckmo_subfunc(kvm, 41); 2913 2914 } 2915 2916 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 2917 { 2918 /* 2919 * If the AP instructions are not being interpreted and the MSAX3 2920 * facility is not configured for the guest, there is nothing to set up. 2921 */ 2922 if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76)) 2923 return; 2924 2925 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 2926 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 2927 vcpu->arch.sie_block->eca &= ~ECA_APIE; 2928 vcpu->arch.sie_block->ecd &= ~ECD_ECC; 2929 2930 if (vcpu->kvm->arch.crypto.apie) 2931 vcpu->arch.sie_block->eca |= ECA_APIE; 2932 2933 /* Set up protected key support */ 2934 if (vcpu->kvm->arch.crypto.aes_kw) { 2935 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 2936 /* ecc is also wrapped with AES key */ 2937 if (kvm_has_pckmo_ecc(vcpu->kvm)) 2938 vcpu->arch.sie_block->ecd |= ECD_ECC; 2939 } 2940 2941 if (vcpu->kvm->arch.crypto.dea_kw) 2942 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 2943 } 2944 2945 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 2946 { 2947 free_page(vcpu->arch.sie_block->cbrlo); 2948 vcpu->arch.sie_block->cbrlo = 0; 2949 } 2950 2951 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 2952 { 2953 vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL); 2954 if (!vcpu->arch.sie_block->cbrlo) 2955 return -ENOMEM; 2956 return 0; 2957 } 2958 2959 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 2960 { 2961 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 2962 2963 vcpu->arch.sie_block->ibc = model->ibc; 2964 if (test_kvm_facility(vcpu->kvm, 7)) 2965 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list; 2966 } 2967 2968 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 2969 { 2970 int rc = 0; 2971 2972 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 2973 CPUSTAT_SM | 2974 CPUSTAT_STOPPED); 2975 2976 if (test_kvm_facility(vcpu->kvm, 78)) 2977 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2); 2978 else if (test_kvm_facility(vcpu->kvm, 8)) 2979 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED); 2980 2981 kvm_s390_vcpu_setup_model(vcpu); 2982 2983 /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */ 2984 if (MACHINE_HAS_ESOP) 2985 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT; 2986 if (test_kvm_facility(vcpu->kvm, 9)) 2987 vcpu->arch.sie_block->ecb |= ECB_SRSI; 2988 if (test_kvm_facility(vcpu->kvm, 73)) 2989 vcpu->arch.sie_block->ecb |= ECB_TE; 2990 2991 if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi) 2992 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI; 2993 if (test_kvm_facility(vcpu->kvm, 130)) 2994 vcpu->arch.sie_block->ecb2 |= ECB2_IEP; 2995 vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI; 2996 if (sclp.has_cei) 2997 vcpu->arch.sie_block->eca |= ECA_CEI; 2998 if (sclp.has_ib) 2999 vcpu->arch.sie_block->eca |= ECA_IB; 3000 if (sclp.has_siif) 3001 vcpu->arch.sie_block->eca |= ECA_SII; 3002 if (sclp.has_sigpif) 3003 vcpu->arch.sie_block->eca |= ECA_SIGPI; 3004 if (test_kvm_facility(vcpu->kvm, 129)) { 3005 vcpu->arch.sie_block->eca |= ECA_VX; 3006 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 3007 } 3008 if (test_kvm_facility(vcpu->kvm, 139)) 3009 vcpu->arch.sie_block->ecd |= ECD_MEF; 3010 if (test_kvm_facility(vcpu->kvm, 156)) 3011 vcpu->arch.sie_block->ecd |= ECD_ETOKENF; 3012 if (vcpu->arch.sie_block->gd) { 3013 vcpu->arch.sie_block->eca |= ECA_AIV; 3014 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", 3015 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); 3016 } 3017 vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx) 3018 | SDNXC; 3019 vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb; 3020 3021 if (sclp.has_kss) 3022 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); 3023 else 3024 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 3025 3026 if (vcpu->kvm->arch.use_cmma) { 3027 rc = kvm_s390_vcpu_setup_cmma(vcpu); 3028 if (rc) 3029 return rc; 3030 } 3031 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 3032 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; 3033 3034 vcpu->arch.sie_block->hpid = HPID_KVM; 3035 3036 kvm_s390_vcpu_crypto_setup(vcpu); 3037 3038 return rc; 3039 } 3040 3041 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 3042 unsigned int id) 3043 { 3044 struct kvm_vcpu *vcpu; 3045 struct sie_page *sie_page; 3046 int rc = -EINVAL; 3047 3048 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) 3049 goto out; 3050 3051 rc = -ENOMEM; 3052 3053 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); 3054 if (!vcpu) 3055 goto out; 3056 3057 BUILD_BUG_ON(sizeof(struct sie_page) != 4096); 3058 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL); 3059 if (!sie_page) 3060 goto out_free_cpu; 3061 3062 vcpu->arch.sie_block = &sie_page->sie_block; 3063 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; 3064 3065 /* the real guest size will always be smaller than msl */ 3066 vcpu->arch.sie_block->mso = 0; 3067 vcpu->arch.sie_block->msl = sclp.hamax; 3068 3069 vcpu->arch.sie_block->icpua = id; 3070 spin_lock_init(&vcpu->arch.local_int.lock); 3071 vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa_int.origin; 3072 if (vcpu->arch.sie_block->gd && sclp.has_gisaf) 3073 vcpu->arch.sie_block->gd |= GISA_FORMAT1; 3074 seqcount_init(&vcpu->arch.cputm_seqcount); 3075 3076 rc = kvm_vcpu_init(vcpu, kvm, id); 3077 if (rc) 3078 goto out_free_sie_block; 3079 VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu, 3080 vcpu->arch.sie_block); 3081 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); 3082 3083 return vcpu; 3084 out_free_sie_block: 3085 free_page((unsigned long)(vcpu->arch.sie_block)); 3086 out_free_cpu: 3087 kmem_cache_free(kvm_vcpu_cache, vcpu); 3088 out: 3089 return ERR_PTR(rc); 3090 } 3091 3092 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 3093 { 3094 return kvm_s390_vcpu_has_irq(vcpu, 0); 3095 } 3096 3097 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 3098 { 3099 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE); 3100 } 3101 3102 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 3103 { 3104 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3105 exit_sie(vcpu); 3106 } 3107 3108 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 3109 { 3110 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3111 } 3112 3113 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 3114 { 3115 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3116 exit_sie(vcpu); 3117 } 3118 3119 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu) 3120 { 3121 return atomic_read(&vcpu->arch.sie_block->prog20) & 3122 (PROG_BLOCK_SIE | PROG_REQUEST); 3123 } 3124 3125 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 3126 { 3127 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3128 } 3129 3130 /* 3131 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running. 3132 * If the CPU is not running (e.g. waiting as idle) the function will 3133 * return immediately. */ 3134 void exit_sie(struct kvm_vcpu *vcpu) 3135 { 3136 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT); 3137 kvm_s390_vsie_kick(vcpu); 3138 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 3139 cpu_relax(); 3140 } 3141 3142 /* Kick a guest cpu out of SIE to process a request synchronously */ 3143 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 3144 { 3145 kvm_make_request(req, vcpu); 3146 kvm_s390_vcpu_request(vcpu); 3147 } 3148 3149 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 3150 unsigned long end) 3151 { 3152 struct kvm *kvm = gmap->private; 3153 struct kvm_vcpu *vcpu; 3154 unsigned long prefix; 3155 int i; 3156 3157 if (gmap_is_shadow(gmap)) 3158 return; 3159 if (start >= 1UL << 31) 3160 /* We are only interested in prefix pages */ 3161 return; 3162 kvm_for_each_vcpu(i, vcpu, kvm) { 3163 /* match against both prefix pages */ 3164 prefix = kvm_s390_get_prefix(vcpu); 3165 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) { 3166 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx", 3167 start, end); 3168 kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu); 3169 } 3170 } 3171 } 3172 3173 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) 3174 { 3175 /* do not poll with more than halt_poll_max_steal percent of steal time */ 3176 if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >= 3177 halt_poll_max_steal) { 3178 vcpu->stat.halt_no_poll_steal++; 3179 return true; 3180 } 3181 return false; 3182 } 3183 3184 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 3185 { 3186 /* kvm common code refers to this, but never calls it */ 3187 BUG(); 3188 return 0; 3189 } 3190 3191 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 3192 struct kvm_one_reg *reg) 3193 { 3194 int r = -EINVAL; 3195 3196 switch (reg->id) { 3197 case KVM_REG_S390_TODPR: 3198 r = put_user(vcpu->arch.sie_block->todpr, 3199 (u32 __user *)reg->addr); 3200 break; 3201 case KVM_REG_S390_EPOCHDIFF: 3202 r = put_user(vcpu->arch.sie_block->epoch, 3203 (u64 __user *)reg->addr); 3204 break; 3205 case KVM_REG_S390_CPU_TIMER: 3206 r = put_user(kvm_s390_get_cpu_timer(vcpu), 3207 (u64 __user *)reg->addr); 3208 break; 3209 case KVM_REG_S390_CLOCK_COMP: 3210 r = put_user(vcpu->arch.sie_block->ckc, 3211 (u64 __user *)reg->addr); 3212 break; 3213 case KVM_REG_S390_PFTOKEN: 3214 r = put_user(vcpu->arch.pfault_token, 3215 (u64 __user *)reg->addr); 3216 break; 3217 case KVM_REG_S390_PFCOMPARE: 3218 r = put_user(vcpu->arch.pfault_compare, 3219 (u64 __user *)reg->addr); 3220 break; 3221 case KVM_REG_S390_PFSELECT: 3222 r = put_user(vcpu->arch.pfault_select, 3223 (u64 __user *)reg->addr); 3224 break; 3225 case KVM_REG_S390_PP: 3226 r = put_user(vcpu->arch.sie_block->pp, 3227 (u64 __user *)reg->addr); 3228 break; 3229 case KVM_REG_S390_GBEA: 3230 r = put_user(vcpu->arch.sie_block->gbea, 3231 (u64 __user *)reg->addr); 3232 break; 3233 default: 3234 break; 3235 } 3236 3237 return r; 3238 } 3239 3240 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 3241 struct kvm_one_reg *reg) 3242 { 3243 int r = -EINVAL; 3244 __u64 val; 3245 3246 switch (reg->id) { 3247 case KVM_REG_S390_TODPR: 3248 r = get_user(vcpu->arch.sie_block->todpr, 3249 (u32 __user *)reg->addr); 3250 break; 3251 case KVM_REG_S390_EPOCHDIFF: 3252 r = get_user(vcpu->arch.sie_block->epoch, 3253 (u64 __user *)reg->addr); 3254 break; 3255 case KVM_REG_S390_CPU_TIMER: 3256 r = get_user(val, (u64 __user *)reg->addr); 3257 if (!r) 3258 kvm_s390_set_cpu_timer(vcpu, val); 3259 break; 3260 case KVM_REG_S390_CLOCK_COMP: 3261 r = get_user(vcpu->arch.sie_block->ckc, 3262 (u64 __user *)reg->addr); 3263 break; 3264 case KVM_REG_S390_PFTOKEN: 3265 r = get_user(vcpu->arch.pfault_token, 3266 (u64 __user *)reg->addr); 3267 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3268 kvm_clear_async_pf_completion_queue(vcpu); 3269 break; 3270 case KVM_REG_S390_PFCOMPARE: 3271 r = get_user(vcpu->arch.pfault_compare, 3272 (u64 __user *)reg->addr); 3273 break; 3274 case KVM_REG_S390_PFSELECT: 3275 r = get_user(vcpu->arch.pfault_select, 3276 (u64 __user *)reg->addr); 3277 break; 3278 case KVM_REG_S390_PP: 3279 r = get_user(vcpu->arch.sie_block->pp, 3280 (u64 __user *)reg->addr); 3281 break; 3282 case KVM_REG_S390_GBEA: 3283 r = get_user(vcpu->arch.sie_block->gbea, 3284 (u64 __user *)reg->addr); 3285 break; 3286 default: 3287 break; 3288 } 3289 3290 return r; 3291 } 3292 3293 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 3294 { 3295 kvm_s390_vcpu_initial_reset(vcpu); 3296 return 0; 3297 } 3298 3299 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 3300 { 3301 vcpu_load(vcpu); 3302 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 3303 vcpu_put(vcpu); 3304 return 0; 3305 } 3306 3307 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 3308 { 3309 vcpu_load(vcpu); 3310 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 3311 vcpu_put(vcpu); 3312 return 0; 3313 } 3314 3315 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 3316 struct kvm_sregs *sregs) 3317 { 3318 vcpu_load(vcpu); 3319 3320 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 3321 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 3322 3323 vcpu_put(vcpu); 3324 return 0; 3325 } 3326 3327 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 3328 struct kvm_sregs *sregs) 3329 { 3330 vcpu_load(vcpu); 3331 3332 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 3333 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 3334 3335 vcpu_put(vcpu); 3336 return 0; 3337 } 3338 3339 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 3340 { 3341 int ret = 0; 3342 3343 vcpu_load(vcpu); 3344 3345 if (test_fp_ctl(fpu->fpc)) { 3346 ret = -EINVAL; 3347 goto out; 3348 } 3349 vcpu->run->s.regs.fpc = fpu->fpc; 3350 if (MACHINE_HAS_VX) 3351 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs, 3352 (freg_t *) fpu->fprs); 3353 else 3354 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs)); 3355 3356 out: 3357 vcpu_put(vcpu); 3358 return ret; 3359 } 3360 3361 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 3362 { 3363 vcpu_load(vcpu); 3364 3365 /* make sure we have the latest values */ 3366 save_fpu_regs(); 3367 if (MACHINE_HAS_VX) 3368 convert_vx_to_fp((freg_t *) fpu->fprs, 3369 (__vector128 *) vcpu->run->s.regs.vrs); 3370 else 3371 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs)); 3372 fpu->fpc = vcpu->run->s.regs.fpc; 3373 3374 vcpu_put(vcpu); 3375 return 0; 3376 } 3377 3378 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 3379 { 3380 int rc = 0; 3381 3382 if (!is_vcpu_stopped(vcpu)) 3383 rc = -EBUSY; 3384 else { 3385 vcpu->run->psw_mask = psw.mask; 3386 vcpu->run->psw_addr = psw.addr; 3387 } 3388 return rc; 3389 } 3390 3391 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 3392 struct kvm_translation *tr) 3393 { 3394 return -EINVAL; /* not implemented yet */ 3395 } 3396 3397 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 3398 KVM_GUESTDBG_USE_HW_BP | \ 3399 KVM_GUESTDBG_ENABLE) 3400 3401 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 3402 struct kvm_guest_debug *dbg) 3403 { 3404 int rc = 0; 3405 3406 vcpu_load(vcpu); 3407 3408 vcpu->guest_debug = 0; 3409 kvm_s390_clear_bp_data(vcpu); 3410 3411 if (dbg->control & ~VALID_GUESTDBG_FLAGS) { 3412 rc = -EINVAL; 3413 goto out; 3414 } 3415 if (!sclp.has_gpere) { 3416 rc = -EINVAL; 3417 goto out; 3418 } 3419 3420 if (dbg->control & KVM_GUESTDBG_ENABLE) { 3421 vcpu->guest_debug = dbg->control; 3422 /* enforce guest PER */ 3423 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P); 3424 3425 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) 3426 rc = kvm_s390_import_bp_data(vcpu, dbg); 3427 } else { 3428 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 3429 vcpu->arch.guestdbg.last_bp = 0; 3430 } 3431 3432 if (rc) { 3433 vcpu->guest_debug = 0; 3434 kvm_s390_clear_bp_data(vcpu); 3435 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 3436 } 3437 3438 out: 3439 vcpu_put(vcpu); 3440 return rc; 3441 } 3442 3443 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 3444 struct kvm_mp_state *mp_state) 3445 { 3446 int ret; 3447 3448 vcpu_load(vcpu); 3449 3450 /* CHECK_STOP and LOAD are not supported yet */ 3451 ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 3452 KVM_MP_STATE_OPERATING; 3453 3454 vcpu_put(vcpu); 3455 return ret; 3456 } 3457 3458 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 3459 struct kvm_mp_state *mp_state) 3460 { 3461 int rc = 0; 3462 3463 vcpu_load(vcpu); 3464 3465 /* user space knows about this interface - let it control the state */ 3466 vcpu->kvm->arch.user_cpu_state_ctrl = 1; 3467 3468 switch (mp_state->mp_state) { 3469 case KVM_MP_STATE_STOPPED: 3470 kvm_s390_vcpu_stop(vcpu); 3471 break; 3472 case KVM_MP_STATE_OPERATING: 3473 kvm_s390_vcpu_start(vcpu); 3474 break; 3475 case KVM_MP_STATE_LOAD: 3476 case KVM_MP_STATE_CHECK_STOP: 3477 /* fall through - CHECK_STOP and LOAD are not supported yet */ 3478 default: 3479 rc = -ENXIO; 3480 } 3481 3482 vcpu_put(vcpu); 3483 return rc; 3484 } 3485 3486 static bool ibs_enabled(struct kvm_vcpu *vcpu) 3487 { 3488 return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS); 3489 } 3490 3491 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 3492 { 3493 retry: 3494 kvm_s390_vcpu_request_handled(vcpu); 3495 if (!kvm_request_pending(vcpu)) 3496 return 0; 3497 /* 3498 * We use MMU_RELOAD just to re-arm the ipte notifier for the 3499 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. 3500 * This ensures that the ipte instruction for this request has 3501 * already finished. We might race against a second unmapper that 3502 * wants to set the blocking bit. Lets just retry the request loop. 3503 */ 3504 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) { 3505 int rc; 3506 rc = gmap_mprotect_notify(vcpu->arch.gmap, 3507 kvm_s390_get_prefix(vcpu), 3508 PAGE_SIZE * 2, PROT_WRITE); 3509 if (rc) { 3510 kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu); 3511 return rc; 3512 } 3513 goto retry; 3514 } 3515 3516 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 3517 vcpu->arch.sie_block->ihcpu = 0xffff; 3518 goto retry; 3519 } 3520 3521 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 3522 if (!ibs_enabled(vcpu)) { 3523 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 3524 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS); 3525 } 3526 goto retry; 3527 } 3528 3529 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 3530 if (ibs_enabled(vcpu)) { 3531 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 3532 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS); 3533 } 3534 goto retry; 3535 } 3536 3537 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { 3538 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 3539 goto retry; 3540 } 3541 3542 if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) { 3543 /* 3544 * Disable CMM virtualization; we will emulate the ESSA 3545 * instruction manually, in order to provide additional 3546 * functionalities needed for live migration. 3547 */ 3548 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA; 3549 goto retry; 3550 } 3551 3552 if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) { 3553 /* 3554 * Re-enable CMM virtualization if CMMA is available and 3555 * CMM has been used. 3556 */ 3557 if ((vcpu->kvm->arch.use_cmma) && 3558 (vcpu->kvm->mm->context.uses_cmm)) 3559 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 3560 goto retry; 3561 } 3562 3563 /* nothing to do, just clear the request */ 3564 kvm_clear_request(KVM_REQ_UNHALT, vcpu); 3565 /* we left the vsie handler, nothing to do, just clear the request */ 3566 kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); 3567 3568 return 0; 3569 } 3570 3571 void kvm_s390_set_tod_clock(struct kvm *kvm, 3572 const struct kvm_s390_vm_tod_clock *gtod) 3573 { 3574 struct kvm_vcpu *vcpu; 3575 struct kvm_s390_tod_clock_ext htod; 3576 int i; 3577 3578 mutex_lock(&kvm->lock); 3579 preempt_disable(); 3580 3581 get_tod_clock_ext((char *)&htod); 3582 3583 kvm->arch.epoch = gtod->tod - htod.tod; 3584 kvm->arch.epdx = 0; 3585 if (test_kvm_facility(kvm, 139)) { 3586 kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx; 3587 if (kvm->arch.epoch > gtod->tod) 3588 kvm->arch.epdx -= 1; 3589 } 3590 3591 kvm_s390_vcpu_block_all(kvm); 3592 kvm_for_each_vcpu(i, vcpu, kvm) { 3593 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 3594 vcpu->arch.sie_block->epdx = kvm->arch.epdx; 3595 } 3596 3597 kvm_s390_vcpu_unblock_all(kvm); 3598 preempt_enable(); 3599 mutex_unlock(&kvm->lock); 3600 } 3601 3602 /** 3603 * kvm_arch_fault_in_page - fault-in guest page if necessary 3604 * @vcpu: The corresponding virtual cpu 3605 * @gpa: Guest physical address 3606 * @writable: Whether the page should be writable or not 3607 * 3608 * Make sure that a guest page has been faulted-in on the host. 3609 * 3610 * Return: Zero on success, negative error code otherwise. 3611 */ 3612 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable) 3613 { 3614 return gmap_fault(vcpu->arch.gmap, gpa, 3615 writable ? FAULT_FLAG_WRITE : 0); 3616 } 3617 3618 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 3619 unsigned long token) 3620 { 3621 struct kvm_s390_interrupt inti; 3622 struct kvm_s390_irq irq; 3623 3624 if (start_token) { 3625 irq.u.ext.ext_params2 = token; 3626 irq.type = KVM_S390_INT_PFAULT_INIT; 3627 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 3628 } else { 3629 inti.type = KVM_S390_INT_PFAULT_DONE; 3630 inti.parm64 = token; 3631 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); 3632 } 3633 } 3634 3635 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 3636 struct kvm_async_pf *work) 3637 { 3638 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 3639 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 3640 } 3641 3642 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 3643 struct kvm_async_pf *work) 3644 { 3645 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 3646 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 3647 } 3648 3649 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 3650 struct kvm_async_pf *work) 3651 { 3652 /* s390 will always inject the page directly */ 3653 } 3654 3655 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 3656 { 3657 /* 3658 * s390 will always inject the page directly, 3659 * but we still want check_async_completion to cleanup 3660 */ 3661 return true; 3662 } 3663 3664 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 3665 { 3666 hva_t hva; 3667 struct kvm_arch_async_pf arch; 3668 int rc; 3669 3670 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3671 return 0; 3672 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 3673 vcpu->arch.pfault_compare) 3674 return 0; 3675 if (psw_extint_disabled(vcpu)) 3676 return 0; 3677 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 3678 return 0; 3679 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) 3680 return 0; 3681 if (!vcpu->arch.gmap->pfault_enabled) 3682 return 0; 3683 3684 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); 3685 hva += current->thread.gmap_addr & ~PAGE_MASK; 3686 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 3687 return 0; 3688 3689 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); 3690 return rc; 3691 } 3692 3693 static int vcpu_pre_run(struct kvm_vcpu *vcpu) 3694 { 3695 int rc, cpuflags; 3696 3697 /* 3698 * On s390 notifications for arriving pages will be delivered directly 3699 * to the guest but the house keeping for completed pfaults is 3700 * handled outside the worker. 3701 */ 3702 kvm_check_async_pf_completion(vcpu); 3703 3704 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; 3705 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; 3706 3707 if (need_resched()) 3708 schedule(); 3709 3710 if (test_cpu_flag(CIF_MCCK_PENDING)) 3711 s390_handle_mcck(); 3712 3713 if (!kvm_is_ucontrol(vcpu->kvm)) { 3714 rc = kvm_s390_deliver_pending_interrupts(vcpu); 3715 if (rc) 3716 return rc; 3717 } 3718 3719 rc = kvm_s390_handle_requests(vcpu); 3720 if (rc) 3721 return rc; 3722 3723 if (guestdbg_enabled(vcpu)) { 3724 kvm_s390_backup_guest_per_regs(vcpu); 3725 kvm_s390_patch_guest_per_regs(vcpu); 3726 } 3727 3728 clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask); 3729 3730 vcpu->arch.sie_block->icptcode = 0; 3731 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 3732 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 3733 trace_kvm_s390_sie_enter(vcpu, cpuflags); 3734 3735 return 0; 3736 } 3737 3738 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu) 3739 { 3740 struct kvm_s390_pgm_info pgm_info = { 3741 .code = PGM_ADDRESSING, 3742 }; 3743 u8 opcode, ilen; 3744 int rc; 3745 3746 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 3747 trace_kvm_s390_sie_fault(vcpu); 3748 3749 /* 3750 * We want to inject an addressing exception, which is defined as a 3751 * suppressing or terminating exception. However, since we came here 3752 * by a DAT access exception, the PSW still points to the faulting 3753 * instruction since DAT exceptions are nullifying. So we've got 3754 * to look up the current opcode to get the length of the instruction 3755 * to be able to forward the PSW. 3756 */ 3757 rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1); 3758 ilen = insn_length(opcode); 3759 if (rc < 0) { 3760 return rc; 3761 } else if (rc) { 3762 /* Instruction-Fetching Exceptions - we can't detect the ilen. 3763 * Forward by arbitrary ilc, injection will take care of 3764 * nullification if necessary. 3765 */ 3766 pgm_info = vcpu->arch.pgm; 3767 ilen = 4; 3768 } 3769 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; 3770 kvm_s390_forward_psw(vcpu, ilen); 3771 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 3772 } 3773 3774 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) 3775 { 3776 struct mcck_volatile_info *mcck_info; 3777 struct sie_page *sie_page; 3778 3779 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 3780 vcpu->arch.sie_block->icptcode); 3781 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 3782 3783 if (guestdbg_enabled(vcpu)) 3784 kvm_s390_restore_guest_per_regs(vcpu); 3785 3786 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; 3787 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; 3788 3789 if (exit_reason == -EINTR) { 3790 VCPU_EVENT(vcpu, 3, "%s", "machine check"); 3791 sie_page = container_of(vcpu->arch.sie_block, 3792 struct sie_page, sie_block); 3793 mcck_info = &sie_page->mcck_info; 3794 kvm_s390_reinject_machine_check(vcpu, mcck_info); 3795 return 0; 3796 } 3797 3798 if (vcpu->arch.sie_block->icptcode > 0) { 3799 int rc = kvm_handle_sie_intercept(vcpu); 3800 3801 if (rc != -EOPNOTSUPP) 3802 return rc; 3803 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; 3804 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 3805 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 3806 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 3807 return -EREMOTE; 3808 } else if (exit_reason != -EFAULT) { 3809 vcpu->stat.exit_null++; 3810 return 0; 3811 } else if (kvm_is_ucontrol(vcpu->kvm)) { 3812 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 3813 vcpu->run->s390_ucontrol.trans_exc_code = 3814 current->thread.gmap_addr; 3815 vcpu->run->s390_ucontrol.pgm_code = 0x10; 3816 return -EREMOTE; 3817 } else if (current->thread.gmap_pfault) { 3818 trace_kvm_s390_major_guest_pfault(vcpu); 3819 current->thread.gmap_pfault = 0; 3820 if (kvm_arch_setup_async_pf(vcpu)) 3821 return 0; 3822 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1); 3823 } 3824 return vcpu_post_run_fault_in_sie(vcpu); 3825 } 3826 3827 static int __vcpu_run(struct kvm_vcpu *vcpu) 3828 { 3829 int rc, exit_reason; 3830 3831 /* 3832 * We try to hold kvm->srcu during most of vcpu_run (except when run- 3833 * ning the guest), so that memslots (and other stuff) are protected 3834 */ 3835 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 3836 3837 do { 3838 rc = vcpu_pre_run(vcpu); 3839 if (rc) 3840 break; 3841 3842 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 3843 /* 3844 * As PF_VCPU will be used in fault handler, between 3845 * guest_enter and guest_exit should be no uaccess. 3846 */ 3847 local_irq_disable(); 3848 guest_enter_irqoff(); 3849 __disable_cpu_timer_accounting(vcpu); 3850 local_irq_enable(); 3851 exit_reason = sie64a(vcpu->arch.sie_block, 3852 vcpu->run->s.regs.gprs); 3853 local_irq_disable(); 3854 __enable_cpu_timer_accounting(vcpu); 3855 guest_exit_irqoff(); 3856 local_irq_enable(); 3857 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 3858 3859 rc = vcpu_post_run(vcpu, exit_reason); 3860 } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); 3861 3862 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 3863 return rc; 3864 } 3865 3866 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 3867 { 3868 struct runtime_instr_cb *riccb; 3869 struct gs_cb *gscb; 3870 3871 riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb; 3872 gscb = (struct gs_cb *) &kvm_run->s.regs.gscb; 3873 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 3874 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 3875 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 3876 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 3877 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 3878 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 3879 /* some control register changes require a tlb flush */ 3880 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 3881 } 3882 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 3883 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); 3884 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 3885 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 3886 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 3887 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 3888 } 3889 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 3890 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 3891 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 3892 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 3893 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3894 kvm_clear_async_pf_completion_queue(vcpu); 3895 } 3896 /* 3897 * If userspace sets the riccb (e.g. after migration) to a valid state, 3898 * we should enable RI here instead of doing the lazy enablement. 3899 */ 3900 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) && 3901 test_kvm_facility(vcpu->kvm, 64) && 3902 riccb->v && 3903 !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) { 3904 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)"); 3905 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 3906 } 3907 /* 3908 * If userspace sets the gscb (e.g. after migration) to non-zero, 3909 * we should enable GS here instead of doing the lazy enablement. 3910 */ 3911 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) && 3912 test_kvm_facility(vcpu->kvm, 133) && 3913 gscb->gssm && 3914 !vcpu->arch.gs_enabled) { 3915 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)"); 3916 vcpu->arch.sie_block->ecb |= ECB_GS; 3917 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 3918 vcpu->arch.gs_enabled = 1; 3919 } 3920 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) && 3921 test_kvm_facility(vcpu->kvm, 82)) { 3922 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 3923 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0; 3924 } 3925 save_access_regs(vcpu->arch.host_acrs); 3926 restore_access_regs(vcpu->run->s.regs.acrs); 3927 /* save host (userspace) fprs/vrs */ 3928 save_fpu_regs(); 3929 vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc; 3930 vcpu->arch.host_fpregs.regs = current->thread.fpu.regs; 3931 if (MACHINE_HAS_VX) 3932 current->thread.fpu.regs = vcpu->run->s.regs.vrs; 3933 else 3934 current->thread.fpu.regs = vcpu->run->s.regs.fprs; 3935 current->thread.fpu.fpc = vcpu->run->s.regs.fpc; 3936 if (test_fp_ctl(current->thread.fpu.fpc)) 3937 /* User space provided an invalid FPC, let's clear it */ 3938 current->thread.fpu.fpc = 0; 3939 if (MACHINE_HAS_GS) { 3940 preempt_disable(); 3941 __ctl_set_bit(2, 4); 3942 if (current->thread.gs_cb) { 3943 vcpu->arch.host_gscb = current->thread.gs_cb; 3944 save_gs_cb(vcpu->arch.host_gscb); 3945 } 3946 if (vcpu->arch.gs_enabled) { 3947 current->thread.gs_cb = (struct gs_cb *) 3948 &vcpu->run->s.regs.gscb; 3949 restore_gs_cb(current->thread.gs_cb); 3950 } 3951 preempt_enable(); 3952 } 3953 /* SIE will load etoken directly from SDNX and therefore kvm_run */ 3954 3955 kvm_run->kvm_dirty_regs = 0; 3956 } 3957 3958 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 3959 { 3960 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 3961 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 3962 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 3963 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 3964 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); 3965 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 3966 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 3967 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 3968 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 3969 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 3970 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 3971 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 3972 kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; 3973 save_access_regs(vcpu->run->s.regs.acrs); 3974 restore_access_regs(vcpu->arch.host_acrs); 3975 /* Save guest register state */ 3976 save_fpu_regs(); 3977 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 3978 /* Restore will be done lazily at return */ 3979 current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc; 3980 current->thread.fpu.regs = vcpu->arch.host_fpregs.regs; 3981 if (MACHINE_HAS_GS) { 3982 __ctl_set_bit(2, 4); 3983 if (vcpu->arch.gs_enabled) 3984 save_gs_cb(current->thread.gs_cb); 3985 preempt_disable(); 3986 current->thread.gs_cb = vcpu->arch.host_gscb; 3987 restore_gs_cb(vcpu->arch.host_gscb); 3988 preempt_enable(); 3989 if (!vcpu->arch.host_gscb) 3990 __ctl_clear_bit(2, 4); 3991 vcpu->arch.host_gscb = NULL; 3992 } 3993 /* SIE will save etoken directly into SDNX and therefore kvm_run */ 3994 } 3995 3996 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 3997 { 3998 int rc; 3999 4000 if (kvm_run->immediate_exit) 4001 return -EINTR; 4002 4003 if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS || 4004 kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS) 4005 return -EINVAL; 4006 4007 vcpu_load(vcpu); 4008 4009 if (guestdbg_exit_pending(vcpu)) { 4010 kvm_s390_prepare_debug_exit(vcpu); 4011 rc = 0; 4012 goto out; 4013 } 4014 4015 kvm_sigset_activate(vcpu); 4016 4017 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 4018 kvm_s390_vcpu_start(vcpu); 4019 } else if (is_vcpu_stopped(vcpu)) { 4020 pr_err_ratelimited("can't run stopped vcpu %d\n", 4021 vcpu->vcpu_id); 4022 rc = -EINVAL; 4023 goto out; 4024 } 4025 4026 sync_regs(vcpu, kvm_run); 4027 enable_cpu_timer_accounting(vcpu); 4028 4029 might_fault(); 4030 rc = __vcpu_run(vcpu); 4031 4032 if (signal_pending(current) && !rc) { 4033 kvm_run->exit_reason = KVM_EXIT_INTR; 4034 rc = -EINTR; 4035 } 4036 4037 if (guestdbg_exit_pending(vcpu) && !rc) { 4038 kvm_s390_prepare_debug_exit(vcpu); 4039 rc = 0; 4040 } 4041 4042 if (rc == -EREMOTE) { 4043 /* userspace support is needed, kvm_run has been prepared */ 4044 rc = 0; 4045 } 4046 4047 disable_cpu_timer_accounting(vcpu); 4048 store_regs(vcpu, kvm_run); 4049 4050 kvm_sigset_deactivate(vcpu); 4051 4052 vcpu->stat.exit_userspace++; 4053 out: 4054 vcpu_put(vcpu); 4055 return rc; 4056 } 4057 4058 /* 4059 * store status at address 4060 * we use have two special cases: 4061 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 4062 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 4063 */ 4064 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 4065 { 4066 unsigned char archmode = 1; 4067 freg_t fprs[NUM_FPRS]; 4068 unsigned int px; 4069 u64 clkcomp, cputm; 4070 int rc; 4071 4072 px = kvm_s390_get_prefix(vcpu); 4073 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 4074 if (write_guest_abs(vcpu, 163, &archmode, 1)) 4075 return -EFAULT; 4076 gpa = 0; 4077 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 4078 if (write_guest_real(vcpu, 163, &archmode, 1)) 4079 return -EFAULT; 4080 gpa = px; 4081 } else 4082 gpa -= __LC_FPREGS_SAVE_AREA; 4083 4084 /* manually convert vector registers if necessary */ 4085 if (MACHINE_HAS_VX) { 4086 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 4087 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 4088 fprs, 128); 4089 } else { 4090 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 4091 vcpu->run->s.regs.fprs, 128); 4092 } 4093 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 4094 vcpu->run->s.regs.gprs, 128); 4095 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 4096 &vcpu->arch.sie_block->gpsw, 16); 4097 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 4098 &px, 4); 4099 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 4100 &vcpu->run->s.regs.fpc, 4); 4101 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 4102 &vcpu->arch.sie_block->todpr, 4); 4103 cputm = kvm_s390_get_cpu_timer(vcpu); 4104 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 4105 &cputm, 8); 4106 clkcomp = vcpu->arch.sie_block->ckc >> 8; 4107 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 4108 &clkcomp, 8); 4109 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 4110 &vcpu->run->s.regs.acrs, 64); 4111 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 4112 &vcpu->arch.sie_block->gcr, 128); 4113 return rc ? -EFAULT : 0; 4114 } 4115 4116 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 4117 { 4118 /* 4119 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 4120 * switch in the run ioctl. Let's update our copies before we save 4121 * it into the save area 4122 */ 4123 save_fpu_regs(); 4124 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 4125 save_access_regs(vcpu->run->s.regs.acrs); 4126 4127 return kvm_s390_store_status_unloaded(vcpu, addr); 4128 } 4129 4130 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 4131 { 4132 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 4133 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 4134 } 4135 4136 static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 4137 { 4138 unsigned int i; 4139 struct kvm_vcpu *vcpu; 4140 4141 kvm_for_each_vcpu(i, vcpu, kvm) { 4142 __disable_ibs_on_vcpu(vcpu); 4143 } 4144 } 4145 4146 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 4147 { 4148 if (!sclp.has_ibs) 4149 return; 4150 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 4151 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 4152 } 4153 4154 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 4155 { 4156 int i, online_vcpus, started_vcpus = 0; 4157 4158 if (!is_vcpu_stopped(vcpu)) 4159 return; 4160 4161 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 4162 /* Only one cpu at a time may enter/leave the STOPPED state. */ 4163 spin_lock(&vcpu->kvm->arch.start_stop_lock); 4164 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 4165 4166 for (i = 0; i < online_vcpus; i++) { 4167 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) 4168 started_vcpus++; 4169 } 4170 4171 if (started_vcpus == 0) { 4172 /* we're the only active VCPU -> speed it up */ 4173 __enable_ibs_on_vcpu(vcpu); 4174 } else if (started_vcpus == 1) { 4175 /* 4176 * As we are starting a second VCPU, we have to disable 4177 * the IBS facility on all VCPUs to remove potentially 4178 * oustanding ENABLE requests. 4179 */ 4180 __disable_ibs_on_all_vcpus(vcpu->kvm); 4181 } 4182 4183 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED); 4184 /* 4185 * Another VCPU might have used IBS while we were offline. 4186 * Let's play safe and flush the VCPU at startup. 4187 */ 4188 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 4189 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 4190 return; 4191 } 4192 4193 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 4194 { 4195 int i, online_vcpus, started_vcpus = 0; 4196 struct kvm_vcpu *started_vcpu = NULL; 4197 4198 if (is_vcpu_stopped(vcpu)) 4199 return; 4200 4201 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 4202 /* Only one cpu at a time may enter/leave the STOPPED state. */ 4203 spin_lock(&vcpu->kvm->arch.start_stop_lock); 4204 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 4205 4206 /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */ 4207 kvm_s390_clear_stop_irq(vcpu); 4208 4209 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED); 4210 __disable_ibs_on_vcpu(vcpu); 4211 4212 for (i = 0; i < online_vcpus; i++) { 4213 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) { 4214 started_vcpus++; 4215 started_vcpu = vcpu->kvm->vcpus[i]; 4216 } 4217 } 4218 4219 if (started_vcpus == 1) { 4220 /* 4221 * As we only have one VCPU left, we want to enable the 4222 * IBS facility for that VCPU to speed it up. 4223 */ 4224 __enable_ibs_on_vcpu(started_vcpu); 4225 } 4226 4227 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 4228 return; 4229 } 4230 4231 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 4232 struct kvm_enable_cap *cap) 4233 { 4234 int r; 4235 4236 if (cap->flags) 4237 return -EINVAL; 4238 4239 switch (cap->cap) { 4240 case KVM_CAP_S390_CSS_SUPPORT: 4241 if (!vcpu->kvm->arch.css_support) { 4242 vcpu->kvm->arch.css_support = 1; 4243 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 4244 trace_kvm_s390_enable_css(vcpu->kvm); 4245 } 4246 r = 0; 4247 break; 4248 default: 4249 r = -EINVAL; 4250 break; 4251 } 4252 return r; 4253 } 4254 4255 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu, 4256 struct kvm_s390_mem_op *mop) 4257 { 4258 void __user *uaddr = (void __user *)mop->buf; 4259 void *tmpbuf = NULL; 4260 int r, srcu_idx; 4261 const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION 4262 | KVM_S390_MEMOP_F_CHECK_ONLY; 4263 4264 if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size) 4265 return -EINVAL; 4266 4267 if (mop->size > MEM_OP_MAX_SIZE) 4268 return -E2BIG; 4269 4270 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 4271 tmpbuf = vmalloc(mop->size); 4272 if (!tmpbuf) 4273 return -ENOMEM; 4274 } 4275 4276 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 4277 4278 switch (mop->op) { 4279 case KVM_S390_MEMOP_LOGICAL_READ: 4280 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 4281 r = check_gva_range(vcpu, mop->gaddr, mop->ar, 4282 mop->size, GACC_FETCH); 4283 break; 4284 } 4285 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 4286 if (r == 0) { 4287 if (copy_to_user(uaddr, tmpbuf, mop->size)) 4288 r = -EFAULT; 4289 } 4290 break; 4291 case KVM_S390_MEMOP_LOGICAL_WRITE: 4292 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 4293 r = check_gva_range(vcpu, mop->gaddr, mop->ar, 4294 mop->size, GACC_STORE); 4295 break; 4296 } 4297 if (copy_from_user(tmpbuf, uaddr, mop->size)) { 4298 r = -EFAULT; 4299 break; 4300 } 4301 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 4302 break; 4303 default: 4304 r = -EINVAL; 4305 } 4306 4307 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 4308 4309 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 4310 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 4311 4312 vfree(tmpbuf); 4313 return r; 4314 } 4315 4316 long kvm_arch_vcpu_async_ioctl(struct file *filp, 4317 unsigned int ioctl, unsigned long arg) 4318 { 4319 struct kvm_vcpu *vcpu = filp->private_data; 4320 void __user *argp = (void __user *)arg; 4321 4322 switch (ioctl) { 4323 case KVM_S390_IRQ: { 4324 struct kvm_s390_irq s390irq; 4325 4326 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 4327 return -EFAULT; 4328 return kvm_s390_inject_vcpu(vcpu, &s390irq); 4329 } 4330 case KVM_S390_INTERRUPT: { 4331 struct kvm_s390_interrupt s390int; 4332 struct kvm_s390_irq s390irq = {}; 4333 4334 if (copy_from_user(&s390int, argp, sizeof(s390int))) 4335 return -EFAULT; 4336 if (s390int_to_s390irq(&s390int, &s390irq)) 4337 return -EINVAL; 4338 return kvm_s390_inject_vcpu(vcpu, &s390irq); 4339 } 4340 } 4341 return -ENOIOCTLCMD; 4342 } 4343 4344 long kvm_arch_vcpu_ioctl(struct file *filp, 4345 unsigned int ioctl, unsigned long arg) 4346 { 4347 struct kvm_vcpu *vcpu = filp->private_data; 4348 void __user *argp = (void __user *)arg; 4349 int idx; 4350 long r; 4351 4352 vcpu_load(vcpu); 4353 4354 switch (ioctl) { 4355 case KVM_S390_STORE_STATUS: 4356 idx = srcu_read_lock(&vcpu->kvm->srcu); 4357 r = kvm_s390_vcpu_store_status(vcpu, arg); 4358 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4359 break; 4360 case KVM_S390_SET_INITIAL_PSW: { 4361 psw_t psw; 4362 4363 r = -EFAULT; 4364 if (copy_from_user(&psw, argp, sizeof(psw))) 4365 break; 4366 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 4367 break; 4368 } 4369 case KVM_S390_INITIAL_RESET: 4370 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); 4371 break; 4372 case KVM_SET_ONE_REG: 4373 case KVM_GET_ONE_REG: { 4374 struct kvm_one_reg reg; 4375 r = -EFAULT; 4376 if (copy_from_user(®, argp, sizeof(reg))) 4377 break; 4378 if (ioctl == KVM_SET_ONE_REG) 4379 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 4380 else 4381 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 4382 break; 4383 } 4384 #ifdef CONFIG_KVM_S390_UCONTROL 4385 case KVM_S390_UCAS_MAP: { 4386 struct kvm_s390_ucas_mapping ucasmap; 4387 4388 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 4389 r = -EFAULT; 4390 break; 4391 } 4392 4393 if (!kvm_is_ucontrol(vcpu->kvm)) { 4394 r = -EINVAL; 4395 break; 4396 } 4397 4398 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, 4399 ucasmap.vcpu_addr, ucasmap.length); 4400 break; 4401 } 4402 case KVM_S390_UCAS_UNMAP: { 4403 struct kvm_s390_ucas_mapping ucasmap; 4404 4405 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 4406 r = -EFAULT; 4407 break; 4408 } 4409 4410 if (!kvm_is_ucontrol(vcpu->kvm)) { 4411 r = -EINVAL; 4412 break; 4413 } 4414 4415 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, 4416 ucasmap.length); 4417 break; 4418 } 4419 #endif 4420 case KVM_S390_VCPU_FAULT: { 4421 r = gmap_fault(vcpu->arch.gmap, arg, 0); 4422 break; 4423 } 4424 case KVM_ENABLE_CAP: 4425 { 4426 struct kvm_enable_cap cap; 4427 r = -EFAULT; 4428 if (copy_from_user(&cap, argp, sizeof(cap))) 4429 break; 4430 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 4431 break; 4432 } 4433 case KVM_S390_MEM_OP: { 4434 struct kvm_s390_mem_op mem_op; 4435 4436 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 4437 r = kvm_s390_guest_mem_op(vcpu, &mem_op); 4438 else 4439 r = -EFAULT; 4440 break; 4441 } 4442 case KVM_S390_SET_IRQ_STATE: { 4443 struct kvm_s390_irq_state irq_state; 4444 4445 r = -EFAULT; 4446 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 4447 break; 4448 if (irq_state.len > VCPU_IRQS_MAX_BUF || 4449 irq_state.len == 0 || 4450 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 4451 r = -EINVAL; 4452 break; 4453 } 4454 /* do not use irq_state.flags, it will break old QEMUs */ 4455 r = kvm_s390_set_irq_state(vcpu, 4456 (void __user *) irq_state.buf, 4457 irq_state.len); 4458 break; 4459 } 4460 case KVM_S390_GET_IRQ_STATE: { 4461 struct kvm_s390_irq_state irq_state; 4462 4463 r = -EFAULT; 4464 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 4465 break; 4466 if (irq_state.len == 0) { 4467 r = -EINVAL; 4468 break; 4469 } 4470 /* do not use irq_state.flags, it will break old QEMUs */ 4471 r = kvm_s390_get_irq_state(vcpu, 4472 (__u8 __user *) irq_state.buf, 4473 irq_state.len); 4474 break; 4475 } 4476 default: 4477 r = -ENOTTY; 4478 } 4479 4480 vcpu_put(vcpu); 4481 return r; 4482 } 4483 4484 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 4485 { 4486 #ifdef CONFIG_KVM_S390_UCONTROL 4487 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 4488 && (kvm_is_ucontrol(vcpu->kvm))) { 4489 vmf->page = virt_to_page(vcpu->arch.sie_block); 4490 get_page(vmf->page); 4491 return 0; 4492 } 4493 #endif 4494 return VM_FAULT_SIGBUS; 4495 } 4496 4497 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 4498 unsigned long npages) 4499 { 4500 return 0; 4501 } 4502 4503 /* Section: memory related */ 4504 int kvm_arch_prepare_memory_region(struct kvm *kvm, 4505 struct kvm_memory_slot *memslot, 4506 const struct kvm_userspace_memory_region *mem, 4507 enum kvm_mr_change change) 4508 { 4509 /* A few sanity checks. We can have memory slots which have to be 4510 located/ended at a segment boundary (1MB). The memory in userland is 4511 ok to be fragmented into various different vmas. It is okay to mmap() 4512 and munmap() stuff in this slot after doing this call at any time */ 4513 4514 if (mem->userspace_addr & 0xffffful) 4515 return -EINVAL; 4516 4517 if (mem->memory_size & 0xffffful) 4518 return -EINVAL; 4519 4520 if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit) 4521 return -EINVAL; 4522 4523 return 0; 4524 } 4525 4526 void kvm_arch_commit_memory_region(struct kvm *kvm, 4527 const struct kvm_userspace_memory_region *mem, 4528 const struct kvm_memory_slot *old, 4529 const struct kvm_memory_slot *new, 4530 enum kvm_mr_change change) 4531 { 4532 int rc = 0; 4533 4534 switch (change) { 4535 case KVM_MR_DELETE: 4536 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE, 4537 old->npages * PAGE_SIZE); 4538 break; 4539 case KVM_MR_MOVE: 4540 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE, 4541 old->npages * PAGE_SIZE); 4542 if (rc) 4543 break; 4544 /* FALLTHROUGH */ 4545 case KVM_MR_CREATE: 4546 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr, 4547 mem->guest_phys_addr, mem->memory_size); 4548 break; 4549 case KVM_MR_FLAGS_ONLY: 4550 break; 4551 default: 4552 WARN(1, "Unknown KVM MR CHANGE: %d\n", change); 4553 } 4554 if (rc) 4555 pr_warn("failed to commit memory region\n"); 4556 return; 4557 } 4558 4559 static inline unsigned long nonhyp_mask(int i) 4560 { 4561 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; 4562 4563 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); 4564 } 4565 4566 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) 4567 { 4568 vcpu->valid_wakeup = false; 4569 } 4570 4571 static int __init kvm_s390_init(void) 4572 { 4573 int i; 4574 4575 if (!sclp.has_sief2) { 4576 pr_info("SIE is not available\n"); 4577 return -ENODEV; 4578 } 4579 4580 if (nested && hpage) { 4581 pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n"); 4582 return -EINVAL; 4583 } 4584 4585 for (i = 0; i < 16; i++) 4586 kvm_s390_fac_base[i] |= 4587 S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i); 4588 4589 return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); 4590 } 4591 4592 static void __exit kvm_s390_exit(void) 4593 { 4594 kvm_exit(); 4595 } 4596 4597 module_init(kvm_s390_init); 4598 module_exit(kvm_s390_exit); 4599 4600 /* 4601 * Enable autoloading of the kvm module. 4602 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 4603 * since x86 takes a different approach. 4604 */ 4605 #include <linux/miscdevice.h> 4606 MODULE_ALIAS_MISCDEV(KVM_MINOR); 4607 MODULE_ALIAS("devname:kvm"); 4608