1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * hosting IBM Z kernel virtual machines (s390x) 4 * 5 * Copyright IBM Corp. 2008, 2020 6 * 7 * Author(s): Carsten Otte <cotte@de.ibm.com> 8 * Christian Borntraeger <borntraeger@de.ibm.com> 9 * Christian Ehrhardt <ehrhardt@de.ibm.com> 10 * Jason J. Herne <jjherne@us.ibm.com> 11 */ 12 13 #define pr_fmt(fmt) "kvm-s390: " fmt 14 15 #include <linux/compiler.h> 16 #include <linux/entry-virt.h> 17 #include <linux/export.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/cpufeature.h> 28 #include <linux/random.h> 29 #include <linux/slab.h> 30 #include <linux/timer.h> 31 #include <linux/vmalloc.h> 32 #include <linux/bitmap.h> 33 #include <linux/sched/signal.h> 34 #include <linux/string.h> 35 #include <linux/pgtable.h> 36 #include <linux/mmu_notifier.h> 37 38 #include <asm/access-regs.h> 39 #include <asm/asm-offsets.h> 40 #include <asm/lowcore.h> 41 #include <asm/machine.h> 42 #include <asm/stp.h> 43 #include <asm/gmap_helpers.h> 44 #include <asm/nmi.h> 45 #include <asm/isc.h> 46 #include <asm/sclp.h> 47 #include <asm/cpacf.h> 48 #include <asm/timex.h> 49 #include <asm/asm.h> 50 #include <asm/fpu.h> 51 #include <asm/ap.h> 52 #include <asm/uv.h> 53 #include "s390.h" 54 #include "gaccess.h" 55 #include "gmap.h" 56 #include "faultin.h" 57 #include "pci.h" 58 #include "kvm_mmu.h" 59 60 #define CREATE_TRACE_POINTS 61 #include "trace.h" 62 #include "trace-s390.h" 63 64 #define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ 65 #define LOCAL_IRQS 32 66 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ 67 (KVM_MAX_VCPUS + LOCAL_IRQS)) 68 69 const struct kvm_stats_desc kvm_vm_stats_desc[] = { 70 KVM_GENERIC_VM_STATS(), 71 STATS_DESC_COUNTER(VM, inject_io), 72 STATS_DESC_COUNTER(VM, io_390_adapter_map), 73 STATS_DESC_COUNTER(VM, io_390_adapter_unmap), 74 STATS_DESC_COUNTER(VM, io_390_inatomic), 75 STATS_DESC_COUNTER(VM, io_flic_inject_airq), 76 STATS_DESC_COUNTER(VM, io_set_adapter_int), 77 STATS_DESC_COUNTER(VM, io_390_inatomic_no_inject), 78 STATS_DESC_COUNTER(VM, inject_float_mchk), 79 STATS_DESC_COUNTER(VM, inject_pfault_done), 80 STATS_DESC_COUNTER(VM, inject_service_signal), 81 STATS_DESC_COUNTER(VM, inject_virtio), 82 STATS_DESC_COUNTER(VM, aen_forward), 83 STATS_DESC_COUNTER(VM, gmap_shadow_reuse), 84 STATS_DESC_COUNTER(VM, gmap_shadow_create), 85 STATS_DESC_COUNTER(VM, gmap_shadow_r1_entry), 86 STATS_DESC_COUNTER(VM, gmap_shadow_r2_entry), 87 STATS_DESC_COUNTER(VM, gmap_shadow_r3_entry), 88 STATS_DESC_COUNTER(VM, gmap_shadow_sg_entry), 89 STATS_DESC_COUNTER(VM, gmap_shadow_pg_entry), 90 }; 91 92 const struct kvm_stats_header kvm_vm_stats_header = { 93 .name_size = KVM_STATS_NAME_SIZE, 94 .num_desc = ARRAY_SIZE(kvm_vm_stats_desc), 95 .id_offset = sizeof(struct kvm_stats_header), 96 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 97 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 98 sizeof(kvm_vm_stats_desc), 99 }; 100 101 const struct kvm_stats_desc kvm_vcpu_stats_desc[] = { 102 KVM_GENERIC_VCPU_STATS(), 103 STATS_DESC_COUNTER(VCPU, exit_userspace), 104 STATS_DESC_COUNTER(VCPU, exit_null), 105 STATS_DESC_COUNTER(VCPU, exit_external_request), 106 STATS_DESC_COUNTER(VCPU, exit_io_request), 107 STATS_DESC_COUNTER(VCPU, exit_external_interrupt), 108 STATS_DESC_COUNTER(VCPU, exit_stop_request), 109 STATS_DESC_COUNTER(VCPU, exit_validity), 110 STATS_DESC_COUNTER(VCPU, exit_instruction), 111 STATS_DESC_COUNTER(VCPU, exit_pei), 112 STATS_DESC_COUNTER(VCPU, halt_no_poll_steal), 113 STATS_DESC_COUNTER(VCPU, instruction_lctl), 114 STATS_DESC_COUNTER(VCPU, instruction_lctlg), 115 STATS_DESC_COUNTER(VCPU, instruction_stctl), 116 STATS_DESC_COUNTER(VCPU, instruction_stctg), 117 STATS_DESC_COUNTER(VCPU, exit_program_interruption), 118 STATS_DESC_COUNTER(VCPU, exit_instr_and_program), 119 STATS_DESC_COUNTER(VCPU, exit_operation_exception), 120 STATS_DESC_COUNTER(VCPU, deliver_ckc), 121 STATS_DESC_COUNTER(VCPU, deliver_cputm), 122 STATS_DESC_COUNTER(VCPU, deliver_external_call), 123 STATS_DESC_COUNTER(VCPU, deliver_emergency_signal), 124 STATS_DESC_COUNTER(VCPU, deliver_service_signal), 125 STATS_DESC_COUNTER(VCPU, deliver_virtio), 126 STATS_DESC_COUNTER(VCPU, deliver_stop_signal), 127 STATS_DESC_COUNTER(VCPU, deliver_prefix_signal), 128 STATS_DESC_COUNTER(VCPU, deliver_restart_signal), 129 STATS_DESC_COUNTER(VCPU, deliver_program), 130 STATS_DESC_COUNTER(VCPU, deliver_io), 131 STATS_DESC_COUNTER(VCPU, deliver_machine_check), 132 STATS_DESC_COUNTER(VCPU, exit_wait_state), 133 STATS_DESC_COUNTER(VCPU, inject_ckc), 134 STATS_DESC_COUNTER(VCPU, inject_cputm), 135 STATS_DESC_COUNTER(VCPU, inject_external_call), 136 STATS_DESC_COUNTER(VCPU, inject_emergency_signal), 137 STATS_DESC_COUNTER(VCPU, inject_mchk), 138 STATS_DESC_COUNTER(VCPU, inject_pfault_init), 139 STATS_DESC_COUNTER(VCPU, inject_program), 140 STATS_DESC_COUNTER(VCPU, inject_restart), 141 STATS_DESC_COUNTER(VCPU, inject_set_prefix), 142 STATS_DESC_COUNTER(VCPU, inject_stop_signal), 143 STATS_DESC_COUNTER(VCPU, instruction_epsw), 144 STATS_DESC_COUNTER(VCPU, instruction_gs), 145 STATS_DESC_COUNTER(VCPU, instruction_io_other), 146 STATS_DESC_COUNTER(VCPU, instruction_lpsw), 147 STATS_DESC_COUNTER(VCPU, instruction_lpswe), 148 STATS_DESC_COUNTER(VCPU, instruction_lpswey), 149 STATS_DESC_COUNTER(VCPU, instruction_pfmf), 150 STATS_DESC_COUNTER(VCPU, instruction_ptff), 151 STATS_DESC_COUNTER(VCPU, instruction_sck), 152 STATS_DESC_COUNTER(VCPU, instruction_sckpf), 153 STATS_DESC_COUNTER(VCPU, instruction_stidp), 154 STATS_DESC_COUNTER(VCPU, instruction_spx), 155 STATS_DESC_COUNTER(VCPU, instruction_stpx), 156 STATS_DESC_COUNTER(VCPU, instruction_stap), 157 STATS_DESC_COUNTER(VCPU, instruction_iske), 158 STATS_DESC_COUNTER(VCPU, instruction_ri), 159 STATS_DESC_COUNTER(VCPU, instruction_rrbe), 160 STATS_DESC_COUNTER(VCPU, instruction_sske), 161 STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock), 162 STATS_DESC_COUNTER(VCPU, instruction_stsi), 163 STATS_DESC_COUNTER(VCPU, instruction_stfl), 164 STATS_DESC_COUNTER(VCPU, instruction_tb), 165 STATS_DESC_COUNTER(VCPU, instruction_tpi), 166 STATS_DESC_COUNTER(VCPU, instruction_tprot), 167 STATS_DESC_COUNTER(VCPU, instruction_tsch), 168 STATS_DESC_COUNTER(VCPU, instruction_sie), 169 STATS_DESC_COUNTER(VCPU, instruction_essa), 170 STATS_DESC_COUNTER(VCPU, instruction_sthyi), 171 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense), 172 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running), 173 STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call), 174 STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency), 175 STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency), 176 STATS_DESC_COUNTER(VCPU, instruction_sigp_start), 177 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop), 178 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status), 179 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status), 180 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status), 181 STATS_DESC_COUNTER(VCPU, instruction_sigp_arch), 182 STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix), 183 STATS_DESC_COUNTER(VCPU, instruction_sigp_restart), 184 STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset), 185 STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset), 186 STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown), 187 STATS_DESC_COUNTER(VCPU, instruction_diagnose_10), 188 STATS_DESC_COUNTER(VCPU, instruction_diagnose_44), 189 STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c), 190 STATS_DESC_COUNTER(VCPU, diag_9c_ignored), 191 STATS_DESC_COUNTER(VCPU, diag_9c_forward), 192 STATS_DESC_COUNTER(VCPU, instruction_diagnose_258), 193 STATS_DESC_COUNTER(VCPU, instruction_diagnose_308), 194 STATS_DESC_COUNTER(VCPU, instruction_diagnose_500), 195 STATS_DESC_COUNTER(VCPU, instruction_diagnose_other), 196 STATS_DESC_COUNTER(VCPU, pfault_sync), 197 STATS_DESC_COUNTER(VCPU, signal_exits) 198 }; 199 200 const struct kvm_stats_header kvm_vcpu_stats_header = { 201 .name_size = KVM_STATS_NAME_SIZE, 202 .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc), 203 .id_offset = sizeof(struct kvm_stats_header), 204 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 205 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 206 sizeof(kvm_vcpu_stats_desc), 207 }; 208 209 /* allow nested virtualization in KVM (if enabled by user space) */ 210 static int nested; 211 module_param(nested, int, S_IRUGO); 212 MODULE_PARM_DESC(nested, "Nested virtualization support"); 213 214 /* allow 1m huge page guest backing */ 215 static int hpage; 216 module_param(hpage, int, 0444); 217 MODULE_PARM_DESC(hpage, "1m huge page backing support"); 218 219 /* allow 2g huge page guest backing */ 220 static int hpage_2g; 221 module_param(hpage_2g, int, 0444); 222 MODULE_PARM_DESC(hpage_2g, "2g huge page backing support"); 223 224 /* maximum percentage of steal time for polling. >100 is treated like 100 */ 225 static u8 halt_poll_max_steal = 10; 226 module_param(halt_poll_max_steal, byte, 0644); 227 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling"); 228 229 /* if set to true, the GISA will be initialized and used if available */ 230 static bool use_gisa = true; 231 module_param(use_gisa, bool, 0644); 232 MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it."); 233 234 /* maximum diag9c forwarding per second */ 235 unsigned int diag9c_forwarding_hz; 236 module_param(diag9c_forwarding_hz, uint, 0644); 237 MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off"); 238 239 /* 240 * allow asynchronous deinit for protected guests; enable by default since 241 * the feature is opt-in anyway 242 */ 243 static int async_destroy = 1; 244 module_param(async_destroy, int, 0444); 245 MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests"); 246 247 #define HMFAI_DWORDS 16 248 /* 249 * Base feature mask that defines default mask for facilities. Consists of the 250 * defines in FACILITIES_KVM and the non-hypervisor managed bits. 251 */ 252 static unsigned long kvm_s390_fac_base[HMFAI_DWORDS] = { FACILITIES_KVM }; 253 static_assert(ARRAY_SIZE(((long[]){ FACILITIES_KVM })) <= HMFAI_DWORDS); 254 static_assert(ARRAY_SIZE(kvm_s390_fac_base) <= S390_ARCH_FAC_MASK_SIZE_U64); 255 static_assert(ARRAY_SIZE(kvm_s390_fac_base) <= S390_ARCH_FAC_LIST_SIZE_U64); 256 static_assert(ARRAY_SIZE(kvm_s390_fac_base) <= ARRAY_SIZE(stfle_fac_list)); 257 258 /* 259 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL 260 * and defines the facilities that can be enabled via a cpu model. 261 */ 262 static const unsigned long kvm_s390_fac_ext[] = { FACILITIES_KVM_CPUMODEL }; 263 static_assert(ARRAY_SIZE(kvm_s390_fac_ext) <= S390_ARCH_FAC_MASK_SIZE_U64); 264 static_assert(ARRAY_SIZE(kvm_s390_fac_ext) <= S390_ARCH_FAC_LIST_SIZE_U64); 265 static_assert(ARRAY_SIZE(kvm_s390_fac_ext) <= ARRAY_SIZE(stfle_fac_list)); 266 267 /* available cpu features supported by kvm */ 268 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 269 /* available subfunctions indicated via query / "test bit" */ 270 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; 271 272 debug_info_t *kvm_s390_dbf; 273 debug_info_t *kvm_s390_dbf_uv; 274 275 /* Section: not file related */ 276 /* forward declarations */ 277 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta) 278 { 279 u8 delta_idx = 0; 280 281 /* 282 * The TOD jumps by delta, we have to compensate this by adding 283 * -delta to the epoch. 284 */ 285 delta = -delta; 286 287 /* sign-extension - we're adding to signed values below */ 288 if ((s64)delta < 0) 289 delta_idx = -1; 290 291 scb->epoch += delta; 292 if (scb->ecd & ECD_MEF) { 293 scb->epdx += delta_idx; 294 if (scb->epoch < delta) 295 scb->epdx += 1; 296 } 297 } 298 299 /* 300 * This callback is executed during stop_machine(). All CPUs are therefore 301 * temporarily stopped. In order not to change guest behavior, we have to 302 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 303 * so a CPU won't be stopped while calculating with the epoch. 304 */ 305 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 306 void *v) 307 { 308 struct kvm *kvm; 309 struct kvm_vcpu *vcpu; 310 unsigned long i; 311 unsigned long long *delta = v; 312 313 list_for_each_entry(kvm, &vm_list, vm_list) { 314 kvm_for_each_vcpu(i, vcpu, kvm) { 315 kvm_clock_sync_scb(vcpu->arch.sie_block, *delta); 316 if (i == 0) { 317 kvm->arch.epoch = vcpu->arch.sie_block->epoch; 318 kvm->arch.epdx = vcpu->arch.sie_block->epdx; 319 } 320 if (vcpu->arch.cputm_enabled) 321 vcpu->arch.cputm_start += *delta; 322 if (vcpu->arch.vsie_block) 323 kvm_clock_sync_scb(vcpu->arch.vsie_block, 324 *delta); 325 } 326 } 327 return NOTIFY_OK; 328 } 329 330 static struct notifier_block kvm_clock_notifier = { 331 .notifier_call = kvm_clock_sync, 332 }; 333 334 static void allow_cpu_feat(unsigned long nr) 335 { 336 set_bit_inv(nr, kvm_s390_available_cpu_feat); 337 } 338 339 static inline int plo_test_bit(unsigned char nr) 340 { 341 unsigned long function = (unsigned long)nr | 0x100; 342 int cc; 343 344 asm volatile( 345 " lgr 0,%[function]\n" 346 /* Parameter registers are ignored for "test bit" */ 347 " plo 0,0,0,0(0)\n" 348 CC_IPM(cc) 349 : CC_OUT(cc, cc) 350 : [function] "d" (function) 351 : CC_CLOBBER_LIST("0")); 352 return CC_TRANSFORM(cc) == 0; 353 } 354 355 static __always_inline void pfcr_query(u8 (*query)[16]) 356 { 357 asm volatile( 358 " lghi 0,0\n" 359 " .insn rsy,0xeb0000000016,0,0,%[query]" 360 : [query] "=QS" (*query) 361 : 362 : "cc", "0"); 363 } 364 365 static __always_inline void __sortl_query(u8 (*query)[32]) 366 { 367 asm volatile( 368 " lghi 0,0\n" 369 " la 1,%[query]\n" 370 /* Parameter registers are ignored */ 371 " .insn rre,0xb9380000,2,4" 372 : [query] "=R" (*query) 373 : 374 : "cc", "0", "1"); 375 } 376 377 static __always_inline void __dfltcc_query(u8 (*query)[32]) 378 { 379 asm volatile( 380 " lghi 0,0\n" 381 " la 1,%[query]\n" 382 /* Parameter registers are ignored */ 383 " .insn rrf,0xb9390000,2,4,6,0" 384 : [query] "=R" (*query) 385 : 386 : "cc", "0", "1"); 387 } 388 389 static void __init kvm_s390_cpu_feat_init(void) 390 { 391 int i; 392 393 for (i = 0; i < 256; ++i) { 394 if (plo_test_bit(i)) 395 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); 396 } 397 398 if (test_facility(28)) /* TOD-clock steering */ 399 ptff(kvm_s390_available_subfunc.ptff, 400 sizeof(kvm_s390_available_subfunc.ptff), 401 PTFF_QAF); 402 403 if (test_facility(17)) { /* MSA */ 404 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *) 405 kvm_s390_available_subfunc.kmac); 406 __cpacf_query(CPACF_KMC, (cpacf_mask_t *) 407 kvm_s390_available_subfunc.kmc); 408 __cpacf_query(CPACF_KM, (cpacf_mask_t *) 409 kvm_s390_available_subfunc.km); 410 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *) 411 kvm_s390_available_subfunc.kimd); 412 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *) 413 kvm_s390_available_subfunc.klmd); 414 } 415 if (test_facility(76)) /* MSA3 */ 416 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *) 417 kvm_s390_available_subfunc.pckmo); 418 if (test_facility(77)) { /* MSA4 */ 419 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *) 420 kvm_s390_available_subfunc.kmctr); 421 __cpacf_query(CPACF_KMF, (cpacf_mask_t *) 422 kvm_s390_available_subfunc.kmf); 423 __cpacf_query(CPACF_KMO, (cpacf_mask_t *) 424 kvm_s390_available_subfunc.kmo); 425 __cpacf_query(CPACF_PCC, (cpacf_mask_t *) 426 kvm_s390_available_subfunc.pcc); 427 } 428 if (test_facility(57)) /* MSA5 */ 429 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *) 430 kvm_s390_available_subfunc.ppno); 431 432 if (test_facility(146)) /* MSA8 */ 433 __cpacf_query(CPACF_KMA, (cpacf_mask_t *) 434 kvm_s390_available_subfunc.kma); 435 436 if (test_facility(155)) /* MSA9 */ 437 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *) 438 kvm_s390_available_subfunc.kdsa); 439 440 if (test_facility(150)) /* SORTL */ 441 __sortl_query(&kvm_s390_available_subfunc.sortl); 442 443 if (test_facility(151)) /* DFLTCC */ 444 __dfltcc_query(&kvm_s390_available_subfunc.dfltcc); 445 446 if (test_facility(201)) /* PFCR */ 447 pfcr_query(&kvm_s390_available_subfunc.pfcr); 448 449 if (machine_has_esop()) 450 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); 451 /* 452 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), 453 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). 454 */ 455 if (!sclp.has_sief2 || !machine_has_esop() || !sclp.has_64bscao || 456 !test_facility(3) || !nested) 457 return; 458 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); 459 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); 460 if (sclp.has_siif) 461 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); 462 if (sclp.has_gpere) 463 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); 464 if (sclp.has_gsls) 465 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); 466 if (sclp.has_ib) 467 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); 468 if (sclp.has_cei) 469 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); 470 if (sclp.has_ibs) 471 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); 472 if (sclp.has_kss) 473 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS); 474 if (sclp.has_astfleie2) 475 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ASTFLEIE2); 476 /* 477 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make 478 * all skey handling functions read/set the skey from the PGSTE 479 * instead of the real storage key. 480 * 481 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make 482 * pages being detected as preserved although they are resident. 483 * 484 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will 485 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. 486 * 487 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and 488 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be 489 * correctly shadowed. We can do that for the PGSTE but not for PTE.I. 490 * 491 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We 492 * cannot easily shadow the SCA because of the ipte lock. 493 */ 494 } 495 496 static int __init __kvm_s390_init(void) 497 { 498 int rc = -ENOMEM; 499 500 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 501 if (!kvm_s390_dbf) 502 return -ENOMEM; 503 504 kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long)); 505 if (!kvm_s390_dbf_uv) 506 goto err_kvm_uv; 507 508 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) || 509 debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view)) 510 goto err_debug_view; 511 512 kvm_s390_cpu_feat_init(); 513 514 /* Register floating interrupt controller interface. */ 515 rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 516 if (rc) { 517 pr_err("A FLIC registration call failed with rc=%d\n", rc); 518 goto err_flic; 519 } 520 521 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { 522 rc = kvm_s390_pci_init(); 523 if (rc) { 524 pr_err("Unable to allocate AIFT for PCI\n"); 525 goto err_pci; 526 } 527 } 528 529 rc = kvm_s390_gib_init(GAL_ISC); 530 if (rc) 531 goto err_gib; 532 533 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 534 &kvm_clock_notifier); 535 536 return 0; 537 538 err_gib: 539 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 540 kvm_s390_pci_exit(); 541 err_pci: 542 err_flic: 543 err_debug_view: 544 debug_unregister(kvm_s390_dbf_uv); 545 err_kvm_uv: 546 debug_unregister(kvm_s390_dbf); 547 return rc; 548 } 549 550 static void __kvm_s390_exit(void) 551 { 552 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 553 &kvm_clock_notifier); 554 555 kvm_s390_gib_destroy(); 556 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 557 kvm_s390_pci_exit(); 558 debug_unregister(kvm_s390_dbf); 559 debug_unregister(kvm_s390_dbf_uv); 560 } 561 562 static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op, 563 unsigned long addr, union skey skey) 564 { 565 gfn_t gfn = gpa_to_gfn(addr); 566 union asce asce; 567 int r; 568 569 guard(read_lock)(&kvm->mmu_lock); 570 asce = kvm->arch.gmap->asce; 571 572 switch (op) { 573 case KVM_S390_KEYOP_SSKE: 574 r = dat_cond_set_storage_key(mc, asce, gfn, skey, &skey, 0, 0, 0); 575 if (r == 0 || r == 1) 576 return skey.skey; 577 break; 578 case KVM_S390_KEYOP_ISKE: 579 r = dat_get_storage_key(asce, gfn, &skey); 580 if (!r) 581 return skey.skey; 582 break; 583 case KVM_S390_KEYOP_RRBE: 584 r = dat_reset_reference_bit(asce, gfn, &skey); 585 if (!r) 586 return skey.skey; 587 break; 588 default: 589 return -EINVAL; 590 } 591 return r > 0 ? -EFAULT : r; 592 } 593 594 /* Section: device related */ 595 long kvm_arch_dev_ioctl(struct file *filp, 596 unsigned int ioctl, unsigned long arg) 597 { 598 if (ioctl == KVM_S390_ENABLE_SIE) 599 return 0; 600 return -EINVAL; 601 } 602 603 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 604 { 605 int r; 606 607 switch (ext) { 608 case KVM_CAP_S390_PSW: 609 case KVM_CAP_S390_GMAP: 610 #ifdef CONFIG_KVM_S390_UCONTROL 611 case KVM_CAP_S390_UCONTROL: 612 #endif 613 case KVM_CAP_ASYNC_PF: 614 case KVM_CAP_SYNC_REGS: 615 case KVM_CAP_ONE_REG: 616 case KVM_CAP_ENABLE_CAP: 617 case KVM_CAP_S390_CSS_SUPPORT: 618 case KVM_CAP_IOEVENTFD: 619 case KVM_CAP_S390_IRQCHIP: 620 case KVM_CAP_VM_ATTRIBUTES: 621 case KVM_CAP_MP_STATE: 622 case KVM_CAP_IMMEDIATE_EXIT: 623 case KVM_CAP_S390_INJECT_IRQ: 624 case KVM_CAP_S390_USER_SIGP: 625 case KVM_CAP_S390_USER_STSI: 626 case KVM_CAP_S390_SKEYS: 627 case KVM_CAP_S390_IRQ_STATE: 628 case KVM_CAP_S390_USER_INSTR0: 629 case KVM_CAP_S390_CMMA_MIGRATION: 630 case KVM_CAP_S390_AIS: 631 case KVM_CAP_S390_AIS_MIGRATION: 632 case KVM_CAP_S390_VCPU_RESETS: 633 case KVM_CAP_SET_GUEST_DEBUG: 634 case KVM_CAP_S390_DIAG318: 635 case KVM_CAP_IRQFD_RESAMPLE: 636 case KVM_CAP_S390_USER_OPEREXEC: 637 case KVM_CAP_S390_KEYOP: 638 case KVM_CAP_S390_VSIE_ESAMODE: 639 case KVM_CAP_PRE_FAULT_MEMORY: 640 r = 1; 641 break; 642 case KVM_CAP_SET_GUEST_DEBUG2: 643 r = KVM_GUESTDBG_VALID_MASK; 644 break; 645 case KVM_CAP_S390_HPAGE_1M: 646 r = 0; 647 if (hpage && !(kvm && kvm_is_ucontrol(kvm))) 648 r = 1; 649 break; 650 case KVM_CAP_S390_HPAGE_2G: 651 r = 0; 652 if (hpage_2g && !(kvm && kvm_is_ucontrol(kvm))) 653 r = 1; 654 break; 655 case KVM_CAP_S390_MEM_OP: 656 r = MEM_OP_MAX_SIZE; 657 break; 658 case KVM_CAP_S390_MEM_OP_EXTENSION: 659 /* 660 * Flag bits indicating which extensions are supported. 661 * If r > 0, the base extension must also be supported/indicated, 662 * in order to maintain backwards compatibility. 663 */ 664 r = KVM_S390_MEMOP_EXTENSION_CAP_BASE | 665 KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG; 666 break; 667 case KVM_CAP_NR_VCPUS: 668 case KVM_CAP_MAX_VCPUS: 669 case KVM_CAP_MAX_VCPU_ID: 670 /* 671 * Return the same value for KVM_CAP_MAX_VCPUS and 672 * KVM_CAP_MAX_VCPU_ID to conform with the KVM API. 673 */ 674 r = KVM_S390_ESCA_CPU_SLOTS; 675 if (!kvm_s390_use_sca_entries()) 676 r = KVM_MAX_VCPUS; 677 if (ext == KVM_CAP_NR_VCPUS) 678 r = min_t(unsigned int, num_online_cpus(), r); 679 break; 680 case KVM_CAP_S390_COW: 681 r = machine_has_esop(); 682 break; 683 case KVM_CAP_S390_VECTOR_REGISTERS: 684 r = test_facility(129); 685 break; 686 case KVM_CAP_S390_RI: 687 r = test_facility(64); 688 break; 689 case KVM_CAP_S390_GS: 690 r = test_facility(133); 691 break; 692 case KVM_CAP_S390_BPB: 693 r = test_facility(82); 694 break; 695 case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE: 696 r = async_destroy && is_prot_virt_host(); 697 break; 698 case KVM_CAP_S390_PROTECTED: 699 r = is_prot_virt_host(); 700 break; 701 case KVM_CAP_S390_PROTECTED_DUMP: { 702 u64 pv_cmds_dump[] = { 703 BIT_UVC_CMD_DUMP_INIT, 704 BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE, 705 BIT_UVC_CMD_DUMP_CPU, 706 BIT_UVC_CMD_DUMP_COMPLETE, 707 }; 708 int i; 709 710 r = is_prot_virt_host(); 711 712 for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) { 713 if (!test_bit_inv(pv_cmds_dump[i], 714 (unsigned long *)&uv_info.inst_calls_list)) { 715 r = 0; 716 break; 717 } 718 } 719 break; 720 } 721 case KVM_CAP_S390_ZPCI_OP: 722 r = kvm_s390_pci_interp_allowed(); 723 break; 724 case KVM_CAP_S390_CPU_TOPOLOGY: 725 r = test_facility(11); 726 break; 727 default: 728 r = 0; 729 } 730 return r; 731 } 732 733 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) 734 { 735 gfn_t last_gfn = memslot->base_gfn + memslot->npages; 736 737 scoped_guard(read_lock, &kvm->mmu_lock) 738 gmap_sync_dirty_log(kvm->arch.gmap, memslot->base_gfn, last_gfn); 739 } 740 741 /* Section: vm related */ 742 static void sca_del_vcpu(struct kvm_vcpu *vcpu); 743 744 /* 745 * Get (and clear) the dirty memory log for a memory slot. 746 */ 747 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 748 struct kvm_dirty_log *log) 749 { 750 return s390_kvm_mmu_get_dirty_log(kvm, log); 751 } 752 753 static void icpt_operexc_on_all_vcpus(struct kvm *kvm) 754 { 755 unsigned long i; 756 struct kvm_vcpu *vcpu; 757 758 kvm_for_each_vcpu(i, vcpu, kvm) { 759 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); 760 } 761 } 762 763 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 764 { 765 int r; 766 767 if (cap->flags) 768 return -EINVAL; 769 770 switch (cap->cap) { 771 case KVM_CAP_S390_IRQCHIP: 772 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 773 kvm->arch.use_irqchip = 1; 774 r = 0; 775 break; 776 case KVM_CAP_S390_USER_SIGP: 777 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 778 kvm->arch.user_sigp = 1; 779 r = 0; 780 break; 781 case KVM_CAP_S390_VECTOR_REGISTERS: 782 mutex_lock(&kvm->lock); 783 if (kvm->created_vcpus) { 784 r = -EBUSY; 785 } else if (cpu_has_vx()) { 786 set_kvm_facility(kvm->arch.model.fac_mask, 129); 787 set_kvm_facility(kvm->arch.model.fac_list, 129); 788 if (test_facility(134)) { 789 set_kvm_facility(kvm->arch.model.fac_mask, 134); 790 set_kvm_facility(kvm->arch.model.fac_list, 134); 791 } 792 if (test_facility(135)) { 793 set_kvm_facility(kvm->arch.model.fac_mask, 135); 794 set_kvm_facility(kvm->arch.model.fac_list, 135); 795 } 796 if (test_facility(148)) { 797 set_kvm_facility(kvm->arch.model.fac_mask, 148); 798 set_kvm_facility(kvm->arch.model.fac_list, 148); 799 } 800 if (test_facility(152)) { 801 set_kvm_facility(kvm->arch.model.fac_mask, 152); 802 set_kvm_facility(kvm->arch.model.fac_list, 152); 803 } 804 if (test_facility(192)) { 805 set_kvm_facility(kvm->arch.model.fac_mask, 192); 806 set_kvm_facility(kvm->arch.model.fac_list, 192); 807 } 808 if (test_facility(198)) { 809 set_kvm_facility(kvm->arch.model.fac_mask, 198); 810 set_kvm_facility(kvm->arch.model.fac_list, 198); 811 } 812 if (test_facility(199)) { 813 set_kvm_facility(kvm->arch.model.fac_mask, 199); 814 set_kvm_facility(kvm->arch.model.fac_list, 199); 815 } 816 r = 0; 817 } else 818 r = -EINVAL; 819 mutex_unlock(&kvm->lock); 820 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 821 r ? "(not available)" : "(success)"); 822 break; 823 case KVM_CAP_S390_RI: 824 r = -EINVAL; 825 mutex_lock(&kvm->lock); 826 if (kvm->created_vcpus) { 827 r = -EBUSY; 828 } else if (test_facility(64)) { 829 set_kvm_facility(kvm->arch.model.fac_mask, 64); 830 set_kvm_facility(kvm->arch.model.fac_list, 64); 831 r = 0; 832 } 833 mutex_unlock(&kvm->lock); 834 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", 835 r ? "(not available)" : "(success)"); 836 break; 837 case KVM_CAP_S390_AIS: 838 mutex_lock(&kvm->lock); 839 if (kvm->created_vcpus) { 840 r = -EBUSY; 841 } else { 842 set_kvm_facility(kvm->arch.model.fac_mask, 72); 843 set_kvm_facility(kvm->arch.model.fac_list, 72); 844 r = 0; 845 } 846 mutex_unlock(&kvm->lock); 847 VM_EVENT(kvm, 3, "ENABLE: AIS %s", 848 r ? "(not available)" : "(success)"); 849 break; 850 case KVM_CAP_S390_GS: 851 r = -EINVAL; 852 mutex_lock(&kvm->lock); 853 if (kvm->created_vcpus) { 854 r = -EBUSY; 855 } else if (test_facility(133)) { 856 set_kvm_facility(kvm->arch.model.fac_mask, 133); 857 set_kvm_facility(kvm->arch.model.fac_list, 133); 858 r = 0; 859 } 860 mutex_unlock(&kvm->lock); 861 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s", 862 r ? "(not available)" : "(success)"); 863 break; 864 case KVM_CAP_S390_HPAGE_1M: 865 mutex_lock(&kvm->lock); 866 if (kvm->created_vcpus) 867 r = -EBUSY; 868 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) 869 r = -EINVAL; 870 else { 871 r = 0; 872 set_bit(GMAP_FLAG_ALLOW_HPAGE_1M, &kvm->arch.gmap->flags); 873 /* 874 * We might have to create fake 4k page 875 * tables. To avoid that the hardware works on 876 * stale PGSTEs, we emulate these instructions. 877 */ 878 kvm->arch.use_skf = 0; 879 kvm->arch.use_pfmfi = 0; 880 } 881 mutex_unlock(&kvm->lock); 882 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s", 883 r ? "(not available)" : "(success)"); 884 break; 885 case KVM_CAP_S390_HPAGE_2G: 886 mutex_lock(&kvm->lock); 887 if (kvm->created_vcpus) { 888 r = -EBUSY; 889 } else if (!hpage_2g || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) { 890 r = -EINVAL; 891 } else { 892 r = 0; 893 set_bit(GMAP_FLAG_ALLOW_HPAGE_2G, &kvm->arch.gmap->flags); 894 /* 895 * We might have to create fake 4k page 896 * tables. To avoid that the hardware works on 897 * stale PGSTEs, we emulate these instructions. 898 */ 899 kvm->arch.use_skf = 0; 900 kvm->arch.use_pfmfi = 0; 901 } 902 mutex_unlock(&kvm->lock); 903 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE_2G %s", 904 r ? "(not available)" : "(success)"); 905 break; 906 case KVM_CAP_S390_USER_STSI: 907 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 908 kvm->arch.user_stsi = 1; 909 r = 0; 910 break; 911 case KVM_CAP_S390_USER_INSTR0: 912 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); 913 kvm->arch.user_instr0 = 1; 914 icpt_operexc_on_all_vcpus(kvm); 915 r = 0; 916 break; 917 case KVM_CAP_S390_CPU_TOPOLOGY: 918 r = -EINVAL; 919 mutex_lock(&kvm->lock); 920 if (kvm->created_vcpus) { 921 r = -EBUSY; 922 } else if (test_facility(11)) { 923 set_kvm_facility(kvm->arch.model.fac_mask, 11); 924 set_kvm_facility(kvm->arch.model.fac_list, 11); 925 r = 0; 926 } 927 mutex_unlock(&kvm->lock); 928 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s", 929 r ? "(not available)" : "(success)"); 930 break; 931 case KVM_CAP_S390_USER_OPEREXEC: 932 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_OPEREXEC"); 933 kvm->arch.user_operexec = 1; 934 icpt_operexc_on_all_vcpus(kvm); 935 r = 0; 936 break; 937 case KVM_CAP_S390_VSIE_ESAMODE: 938 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_VSIE_ESAMODE"); 939 kvm->arch.allow_vsie_esamode = 1; 940 r = 0; 941 break; 942 default: 943 r = -EINVAL; 944 break; 945 } 946 return r; 947 } 948 949 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 950 { 951 int ret; 952 953 switch (attr->attr) { 954 case KVM_S390_VM_MEM_LIMIT_SIZE: 955 ret = 0; 956 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 957 kvm->arch.mem_limit); 958 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) 959 ret = -EFAULT; 960 break; 961 default: 962 ret = -ENXIO; 963 break; 964 } 965 return ret; 966 } 967 968 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 969 { 970 int ret; 971 972 switch (attr->attr) { 973 case KVM_S390_VM_MEM_ENABLE_CMMA: 974 ret = -ENXIO; 975 if (!sclp.has_cmma) 976 break; 977 978 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 979 mutex_lock(&kvm->lock); 980 if (kvm->created_vcpus) 981 ret = -EBUSY; 982 else { 983 kvm->arch.use_cmma = 1; 984 /* Not compatible with cmma. */ 985 kvm->arch.use_pfmfi = 0; 986 ret = 0; 987 } 988 mutex_unlock(&kvm->lock); 989 break; 990 case KVM_S390_VM_MEM_CLR_CMMA: { 991 gfn_t start_gfn = 0; 992 993 ret = -ENXIO; 994 if (!sclp.has_cmma) 995 break; 996 ret = -EINVAL; 997 if (!kvm->arch.use_cmma) 998 break; 999 1000 guard(mutex)(&kvm->lock); 1001 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 1002 do { 1003 scoped_guard(read_lock, &kvm->mmu_lock) 1004 start_gfn = dat_reset_cmma(kvm->arch.gmap->asce, start_gfn); 1005 } while (start_gfn); 1006 ret = 0; 1007 break; 1008 } 1009 case KVM_S390_VM_MEM_LIMIT_SIZE: { 1010 struct kvm_memslots *slots; 1011 struct kvm_memory_slot *ms; 1012 unsigned long new_limit; 1013 int bkt; 1014 1015 if (kvm_is_ucontrol(kvm)) 1016 return -EINVAL; 1017 1018 if (get_user(new_limit, (u64 __user *)attr->addr)) 1019 return -EFAULT; 1020 1021 guard(mutex)(&kvm->lock); 1022 1023 new_limit = ALIGN(new_limit, HPAGE_SIZE); 1024 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && 1025 new_limit > kvm->arch.mem_limit) 1026 return -E2BIG; 1027 1028 if (!new_limit) 1029 return -EINVAL; 1030 1031 if (kvm->created_vcpus) 1032 return -EBUSY; 1033 1034 ret = 0; 1035 scoped_guard(mutex, &kvm->slots_lock) { 1036 slots = kvm_memslots(kvm); 1037 if (slots && !kvm_memslots_empty(slots)) { 1038 kvm_for_each_memslot(ms, bkt, slots) { 1039 if (gpa_to_gfn(new_limit) < ms->base_gfn + ms->npages) { 1040 ret = -EBUSY; 1041 break; 1042 } 1043 } 1044 } 1045 if (!ret) 1046 ret = gmap_set_limit(kvm->arch.gmap, gpa_to_gfn(new_limit)); 1047 } 1048 if (ret) 1049 break; 1050 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); 1051 VM_EVENT(kvm, 3, "New guest asce: 0x%p", (void *)kvm->arch.gmap->asce.val); 1052 break; 1053 } 1054 default: 1055 ret = -ENXIO; 1056 break; 1057 } 1058 return ret; 1059 } 1060 1061 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 1062 1063 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) 1064 { 1065 struct kvm_vcpu *vcpu; 1066 unsigned long i; 1067 1068 kvm_s390_vcpu_block_all(kvm); 1069 1070 kvm_for_each_vcpu(i, vcpu, kvm) { 1071 kvm_s390_vcpu_crypto_setup(vcpu); 1072 /* recreate the shadow crycb by leaving the VSIE handler */ 1073 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 1074 } 1075 1076 kvm_s390_vcpu_unblock_all(kvm); 1077 } 1078 1079 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 1080 { 1081 mutex_lock(&kvm->lock); 1082 switch (attr->attr) { 1083 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 1084 if (!test_kvm_facility(kvm, 76)) { 1085 mutex_unlock(&kvm->lock); 1086 return -EINVAL; 1087 } 1088 get_random_bytes( 1089 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 1090 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1091 kvm->arch.crypto.aes_kw = 1; 1092 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 1093 break; 1094 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 1095 if (!test_kvm_facility(kvm, 76)) { 1096 mutex_unlock(&kvm->lock); 1097 return -EINVAL; 1098 } 1099 get_random_bytes( 1100 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 1101 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1102 kvm->arch.crypto.dea_kw = 1; 1103 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 1104 break; 1105 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 1106 if (!test_kvm_facility(kvm, 76)) { 1107 mutex_unlock(&kvm->lock); 1108 return -EINVAL; 1109 } 1110 kvm->arch.crypto.aes_kw = 0; 1111 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 1112 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1113 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 1114 break; 1115 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 1116 if (!test_kvm_facility(kvm, 76)) { 1117 mutex_unlock(&kvm->lock); 1118 return -EINVAL; 1119 } 1120 kvm->arch.crypto.dea_kw = 0; 1121 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 1122 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1123 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 1124 break; 1125 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 1126 if (!ap_instructions_available()) { 1127 mutex_unlock(&kvm->lock); 1128 return -EOPNOTSUPP; 1129 } 1130 kvm->arch.crypto.apie = 1; 1131 break; 1132 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 1133 if (!ap_instructions_available()) { 1134 mutex_unlock(&kvm->lock); 1135 return -EOPNOTSUPP; 1136 } 1137 kvm->arch.crypto.apie = 0; 1138 break; 1139 default: 1140 mutex_unlock(&kvm->lock); 1141 return -ENXIO; 1142 } 1143 1144 kvm_s390_vcpu_crypto_reset_all(kvm); 1145 mutex_unlock(&kvm->lock); 1146 return 0; 1147 } 1148 1149 static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu) 1150 { 1151 /* Only set the ECB bits after guest requests zPCI interpretation */ 1152 if (!vcpu->kvm->arch.use_zpci_interp) 1153 return; 1154 1155 vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI; 1156 vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI; 1157 } 1158 1159 void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm) 1160 { 1161 struct kvm_vcpu *vcpu; 1162 unsigned long i; 1163 1164 lockdep_assert_held(&kvm->lock); 1165 1166 if (!kvm_s390_pci_interp_allowed()) 1167 return; 1168 1169 /* 1170 * If host is configured for PCI and the necessary facilities are 1171 * available, turn on interpretation for the life of this guest 1172 */ 1173 kvm->arch.use_zpci_interp = 1; 1174 1175 kvm_s390_vcpu_block_all(kvm); 1176 1177 kvm_for_each_vcpu(i, vcpu, kvm) { 1178 kvm_s390_vcpu_pci_setup(vcpu); 1179 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 1180 } 1181 1182 kvm_s390_vcpu_unblock_all(kvm); 1183 } 1184 1185 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) 1186 { 1187 unsigned long cx; 1188 struct kvm_vcpu *vcpu; 1189 1190 kvm_for_each_vcpu(cx, vcpu, kvm) 1191 kvm_s390_sync_request(req, vcpu); 1192 } 1193 1194 /* 1195 * Must be called with kvm->srcu held to avoid races on memslots, and with 1196 * kvm->slots_arch_lock to avoid races with ourselves, 1197 * kvm_s390_vm_stop_migration(), and kvm_s390_get_cmma_bits(). 1198 */ 1199 static int kvm_s390_vm_start_migration(struct kvm *kvm) 1200 { 1201 struct kvm_memory_slot *ms; 1202 struct kvm_memslots *slots; 1203 int bkt; 1204 1205 /* migration mode already enabled */ 1206 if (kvm->arch.migration_mode) 1207 return 0; 1208 slots = kvm_memslots(kvm); 1209 if (!slots || kvm_memslots_empty(slots)) 1210 return -EINVAL; 1211 1212 if (!kvm->arch.use_cmma) { 1213 kvm->arch.migration_mode = 1; 1214 return 0; 1215 } 1216 kvm_for_each_memslot(ms, bkt, slots) { 1217 if (!ms->dirty_bitmap) 1218 return -EINVAL; 1219 } 1220 /* 1221 * Set the flag and let KVM handle ESSA manually, potentially setting 1222 * the cmma_d bit in some PGSTEs and increasing cmma_dirty_pages. 1223 * At this point cmma_dirty_pages is still 0, and all existing PGSTEs 1224 * have their cmma_d bit set to 0. 1225 * Any newly allocated page table has its entries marked as cmma-clean, 1226 * which is fine because the CMMA values are not dirty. 1227 */ 1228 WRITE_ONCE(kvm->arch.migration_mode, 1); 1229 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION); 1230 /* 1231 * Mark all PGSTEs as cmma-dirty, increasing cmma_dirty_pages as needed, 1232 * but without double-counting pages that have become dirty on their own 1233 * in the meantime. 1234 * At this point some pages might have become dirty on their own already 1235 * and cmma_dirty_pages might therefore be non-zero. 1236 */ 1237 gmap_set_cmma_all_dirty(kvm->arch.gmap); 1238 return 0; 1239 } 1240 1241 /* 1242 * Must be called with kvm->slots_arch_lock to avoid races with ourselves, 1243 * kvm_s390_vm_start_migration() and kvm_s390_get_cmma_bits(). 1244 */ 1245 int kvm_s390_vm_stop_migration(struct kvm *kvm) 1246 { 1247 /* migration mode already disabled */ 1248 if (!kvm->arch.migration_mode) 1249 return 0; 1250 /* 1251 * Unset the flag and propagate to all vCPUs. From now on the cmma_d 1252 * bit will not be touched on any PGSTE. 1253 * At this point cmma_dirty_pages is possibly non-zero, and thus some 1254 * PGSTEs might have cmma_d set. 1255 */ 1256 WRITE_ONCE(kvm->arch.migration_mode, 0); 1257 if (!kvm->arch.use_cmma) 1258 return 0; 1259 1260 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION); 1261 /* Clear cmma_d on all existing PGSTEs and set cmma_dirty_pages to 0. */ 1262 gmap_set_cmma_all_clean(kvm->arch.gmap); 1263 atomic64_set(&kvm->arch.cmma_dirty_pages, 0); 1264 /* 1265 * At this point the system has the expected state: migration_mode is 0, 1266 * cmma_dirty_pages is 0, and all existing PGSTEs have their cmma_d bit 1267 * set to 0. 1268 */ 1269 return 0; 1270 } 1271 1272 static int kvm_s390_vm_set_migration(struct kvm *kvm, 1273 struct kvm_device_attr *attr) 1274 { 1275 int res = -ENXIO; 1276 1277 guard(srcu)(&kvm->srcu); 1278 guard(mutex)(&kvm->slots_arch_lock); 1279 1280 switch (attr->attr) { 1281 case KVM_S390_VM_MIGRATION_START: 1282 res = kvm_s390_vm_start_migration(kvm); 1283 break; 1284 case KVM_S390_VM_MIGRATION_STOP: 1285 res = kvm_s390_vm_stop_migration(kvm); 1286 break; 1287 default: 1288 break; 1289 } 1290 1291 return res; 1292 } 1293 1294 static int kvm_s390_vm_get_migration(struct kvm *kvm, 1295 struct kvm_device_attr *attr) 1296 { 1297 u64 mig = kvm->arch.migration_mode; 1298 1299 if (attr->attr != KVM_S390_VM_MIGRATION_STATUS) 1300 return -ENXIO; 1301 1302 if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig))) 1303 return -EFAULT; 1304 return 0; 1305 } 1306 1307 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); 1308 1309 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1310 { 1311 struct kvm_s390_vm_tod_clock gtod; 1312 1313 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 1314 return -EFAULT; 1315 1316 if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) 1317 return -EINVAL; 1318 __kvm_s390_set_tod_clock(kvm, >od); 1319 1320 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", 1321 gtod.epoch_idx, gtod.tod); 1322 1323 return 0; 1324 } 1325 1326 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1327 { 1328 u8 gtod_high; 1329 1330 if (copy_from_user(>od_high, (void __user *)attr->addr, 1331 sizeof(gtod_high))) 1332 return -EFAULT; 1333 1334 if (gtod_high != 0) 1335 return -EINVAL; 1336 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 1337 1338 return 0; 1339 } 1340 1341 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1342 { 1343 struct kvm_s390_vm_tod_clock gtod = { 0 }; 1344 1345 if (copy_from_user(>od.tod, (void __user *)attr->addr, 1346 sizeof(gtod.tod))) 1347 return -EFAULT; 1348 1349 __kvm_s390_set_tod_clock(kvm, >od); 1350 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); 1351 return 0; 1352 } 1353 1354 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1355 { 1356 int ret; 1357 1358 if (attr->flags) 1359 return -EINVAL; 1360 1361 mutex_lock(&kvm->lock); 1362 /* 1363 * For protected guests, the TOD is managed by the ultravisor, so trying 1364 * to change it will never bring the expected results. 1365 */ 1366 if (kvm_s390_pv_is_protected(kvm)) { 1367 ret = -EOPNOTSUPP; 1368 goto out_unlock; 1369 } 1370 1371 switch (attr->attr) { 1372 case KVM_S390_VM_TOD_EXT: 1373 ret = kvm_s390_set_tod_ext(kvm, attr); 1374 break; 1375 case KVM_S390_VM_TOD_HIGH: 1376 ret = kvm_s390_set_tod_high(kvm, attr); 1377 break; 1378 case KVM_S390_VM_TOD_LOW: 1379 ret = kvm_s390_set_tod_low(kvm, attr); 1380 break; 1381 default: 1382 ret = -ENXIO; 1383 break; 1384 } 1385 1386 out_unlock: 1387 mutex_unlock(&kvm->lock); 1388 return ret; 1389 } 1390 1391 static void kvm_s390_get_tod_clock(struct kvm *kvm, 1392 struct kvm_s390_vm_tod_clock *gtod) 1393 { 1394 union tod_clock clk; 1395 1396 preempt_disable(); 1397 1398 store_tod_clock_ext(&clk); 1399 1400 gtod->tod = clk.tod + kvm->arch.epoch; 1401 gtod->epoch_idx = 0; 1402 if (test_kvm_facility(kvm, 139)) { 1403 gtod->epoch_idx = clk.ei + kvm->arch.epdx; 1404 if (gtod->tod < clk.tod) 1405 gtod->epoch_idx += 1; 1406 } 1407 1408 preempt_enable(); 1409 } 1410 1411 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1412 { 1413 struct kvm_s390_vm_tod_clock gtod; 1414 1415 memset(>od, 0, sizeof(gtod)); 1416 kvm_s390_get_tod_clock(kvm, >od); 1417 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1418 return -EFAULT; 1419 1420 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx", 1421 gtod.epoch_idx, gtod.tod); 1422 return 0; 1423 } 1424 1425 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1426 { 1427 u8 gtod_high = 0; 1428 1429 if (copy_to_user((void __user *)attr->addr, >od_high, 1430 sizeof(gtod_high))) 1431 return -EFAULT; 1432 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 1433 1434 return 0; 1435 } 1436 1437 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1438 { 1439 u64 gtod; 1440 1441 gtod = kvm_s390_get_tod_clock_fast(kvm); 1442 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1443 return -EFAULT; 1444 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 1445 1446 return 0; 1447 } 1448 1449 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1450 { 1451 int ret; 1452 1453 if (attr->flags) 1454 return -EINVAL; 1455 1456 switch (attr->attr) { 1457 case KVM_S390_VM_TOD_EXT: 1458 ret = kvm_s390_get_tod_ext(kvm, attr); 1459 break; 1460 case KVM_S390_VM_TOD_HIGH: 1461 ret = kvm_s390_get_tod_high(kvm, attr); 1462 break; 1463 case KVM_S390_VM_TOD_LOW: 1464 ret = kvm_s390_get_tod_low(kvm, attr); 1465 break; 1466 default: 1467 ret = -ENXIO; 1468 break; 1469 } 1470 return ret; 1471 } 1472 1473 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1474 { 1475 struct kvm_s390_vm_cpu_processor *proc; 1476 u16 lowest_ibc, unblocked_ibc; 1477 int ret = 0; 1478 1479 mutex_lock(&kvm->lock); 1480 if (kvm->created_vcpus) { 1481 ret = -EBUSY; 1482 goto out; 1483 } 1484 proc = kzalloc_obj(*proc, GFP_KERNEL_ACCOUNT); 1485 if (!proc) { 1486 ret = -ENOMEM; 1487 goto out; 1488 } 1489 if (!copy_from_user(proc, (void __user *)attr->addr, 1490 sizeof(*proc))) { 1491 kvm->arch.model.cpuid = proc->cpuid; 1492 lowest_ibc = sclp.ibc >> 16 & 0xfff; 1493 unblocked_ibc = sclp.ibc & 0xfff; 1494 if (lowest_ibc && proc->ibc) { 1495 if (proc->ibc > unblocked_ibc) 1496 kvm->arch.model.ibc = unblocked_ibc; 1497 else if (proc->ibc < lowest_ibc) 1498 kvm->arch.model.ibc = lowest_ibc; 1499 else 1500 kvm->arch.model.ibc = proc->ibc; 1501 } 1502 memcpy(kvm->arch.model.fac_list, proc->fac_list, 1503 S390_ARCH_FAC_LIST_SIZE_BYTE); 1504 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1505 kvm->arch.model.ibc, 1506 kvm->arch.model.cpuid); 1507 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1508 kvm->arch.model.fac_list[0], 1509 kvm->arch.model.fac_list[1], 1510 kvm->arch.model.fac_list[2]); 1511 } else 1512 ret = -EFAULT; 1513 kfree(proc); 1514 out: 1515 mutex_unlock(&kvm->lock); 1516 return ret; 1517 } 1518 1519 static int kvm_s390_set_processor_feat(struct kvm *kvm, 1520 struct kvm_device_attr *attr) 1521 { 1522 struct kvm_s390_vm_cpu_feat data; 1523 1524 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) 1525 return -EFAULT; 1526 if (!bitmap_subset((unsigned long *) data.feat, 1527 kvm_s390_available_cpu_feat, 1528 KVM_S390_VM_CPU_FEAT_NR_BITS)) 1529 return -EINVAL; 1530 1531 mutex_lock(&kvm->lock); 1532 if (kvm->created_vcpus) { 1533 mutex_unlock(&kvm->lock); 1534 return -EBUSY; 1535 } 1536 bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1537 mutex_unlock(&kvm->lock); 1538 VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1539 data.feat[0], 1540 data.feat[1], 1541 data.feat[2]); 1542 return 0; 1543 } 1544 1545 static int kvm_s390_set_processor_subfunc(struct kvm *kvm, 1546 struct kvm_device_attr *attr) 1547 { 1548 mutex_lock(&kvm->lock); 1549 if (kvm->created_vcpus) { 1550 mutex_unlock(&kvm->lock); 1551 return -EBUSY; 1552 } 1553 1554 if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr, 1555 sizeof(struct kvm_s390_vm_cpu_subfunc))) { 1556 mutex_unlock(&kvm->lock); 1557 return -EFAULT; 1558 } 1559 mutex_unlock(&kvm->lock); 1560 1561 VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1562 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1563 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1564 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1565 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1566 VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1567 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1568 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1569 VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1570 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1571 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1572 VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1573 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1574 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1575 VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx", 1576 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1577 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1578 VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1579 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1580 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1581 VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1582 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1583 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1584 VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1585 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1586 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1587 VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1588 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1589 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1590 VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1591 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1592 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1593 VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1594 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1595 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1596 VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1597 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1598 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1599 VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1600 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1601 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1602 VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1603 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1604 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1605 VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1606 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1607 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1608 VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1609 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1610 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1611 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1612 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1613 VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1614 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1615 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1616 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1617 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1618 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx", 1619 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1620 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1621 1622 return 0; 1623 } 1624 1625 #define KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK \ 1626 ( \ 1627 ((struct kvm_s390_vm_cpu_uv_feat){ \ 1628 .ap = 1, \ 1629 .ap_intr = 1, \ 1630 }) \ 1631 .feat \ 1632 ) 1633 1634 static int kvm_s390_set_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1635 { 1636 struct kvm_s390_vm_cpu_uv_feat __user *ptr = (void __user *)attr->addr; 1637 unsigned long data, filter; 1638 1639 filter = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; 1640 if (get_user(data, &ptr->feat)) 1641 return -EFAULT; 1642 if (!bitmap_subset(&data, &filter, KVM_S390_VM_CPU_UV_FEAT_NR_BITS)) 1643 return -EINVAL; 1644 1645 mutex_lock(&kvm->lock); 1646 if (kvm->created_vcpus) { 1647 mutex_unlock(&kvm->lock); 1648 return -EBUSY; 1649 } 1650 kvm->arch.model.uv_feat_guest.feat = data; 1651 mutex_unlock(&kvm->lock); 1652 1653 VM_EVENT(kvm, 3, "SET: guest UV-feat: 0x%16.16lx", data); 1654 1655 return 0; 1656 } 1657 1658 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1659 { 1660 int ret = -ENXIO; 1661 1662 switch (attr->attr) { 1663 case KVM_S390_VM_CPU_PROCESSOR: 1664 ret = kvm_s390_set_processor(kvm, attr); 1665 break; 1666 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1667 ret = kvm_s390_set_processor_feat(kvm, attr); 1668 break; 1669 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1670 ret = kvm_s390_set_processor_subfunc(kvm, attr); 1671 break; 1672 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 1673 ret = kvm_s390_set_uv_feat(kvm, attr); 1674 break; 1675 } 1676 return ret; 1677 } 1678 1679 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1680 { 1681 struct kvm_s390_vm_cpu_processor *proc; 1682 int ret = 0; 1683 1684 proc = kzalloc_obj(*proc, GFP_KERNEL_ACCOUNT); 1685 if (!proc) { 1686 ret = -ENOMEM; 1687 goto out; 1688 } 1689 proc->cpuid = kvm->arch.model.cpuid; 1690 proc->ibc = kvm->arch.model.ibc; 1691 memcpy(&proc->fac_list, kvm->arch.model.fac_list, 1692 S390_ARCH_FAC_LIST_SIZE_BYTE); 1693 VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1694 kvm->arch.model.ibc, 1695 kvm->arch.model.cpuid); 1696 VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1697 kvm->arch.model.fac_list[0], 1698 kvm->arch.model.fac_list[1], 1699 kvm->arch.model.fac_list[2]); 1700 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 1701 ret = -EFAULT; 1702 kfree(proc); 1703 out: 1704 return ret; 1705 } 1706 1707 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 1708 { 1709 struct kvm_s390_vm_cpu_machine *mach; 1710 int ret = 0; 1711 1712 mach = kzalloc_obj(*mach, GFP_KERNEL_ACCOUNT); 1713 if (!mach) { 1714 ret = -ENOMEM; 1715 goto out; 1716 } 1717 get_cpu_id((struct cpuid *) &mach->cpuid); 1718 mach->ibc = sclp.ibc; 1719 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, 1720 S390_ARCH_FAC_LIST_SIZE_BYTE); 1721 memcpy((unsigned long *)&mach->fac_list, stfle_fac_list, 1722 sizeof(stfle_fac_list)); 1723 VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx", 1724 kvm->arch.model.ibc, 1725 kvm->arch.model.cpuid); 1726 VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx", 1727 mach->fac_mask[0], 1728 mach->fac_mask[1], 1729 mach->fac_mask[2]); 1730 VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1731 mach->fac_list[0], 1732 mach->fac_list[1], 1733 mach->fac_list[2]); 1734 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 1735 ret = -EFAULT; 1736 kfree(mach); 1737 out: 1738 return ret; 1739 } 1740 1741 static int kvm_s390_get_processor_feat(struct kvm *kvm, 1742 struct kvm_device_attr *attr) 1743 { 1744 struct kvm_s390_vm_cpu_feat data; 1745 1746 bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1747 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1748 return -EFAULT; 1749 VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1750 data.feat[0], 1751 data.feat[1], 1752 data.feat[2]); 1753 return 0; 1754 } 1755 1756 static int kvm_s390_get_machine_feat(struct kvm *kvm, 1757 struct kvm_device_attr *attr) 1758 { 1759 struct kvm_s390_vm_cpu_feat data; 1760 1761 bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1762 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1763 return -EFAULT; 1764 VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1765 data.feat[0], 1766 data.feat[1], 1767 data.feat[2]); 1768 return 0; 1769 } 1770 1771 static int kvm_s390_get_processor_subfunc(struct kvm *kvm, 1772 struct kvm_device_attr *attr) 1773 { 1774 if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs, 1775 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1776 return -EFAULT; 1777 1778 VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1779 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1780 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1781 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1782 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1783 VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1784 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1785 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1786 VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1787 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1788 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1789 VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1790 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1791 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1792 VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx", 1793 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1794 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1795 VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1796 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1797 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1798 VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1799 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1800 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1801 VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1802 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1803 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1804 VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1805 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1806 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1807 VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1808 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1809 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1810 VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1811 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1812 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1813 VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1814 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1815 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1816 VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1817 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1818 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1819 VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1820 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1821 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1822 VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1823 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1824 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1825 VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1826 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1827 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1828 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1829 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1830 VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1831 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1832 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1833 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1834 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1835 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx", 1836 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1837 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1838 1839 return 0; 1840 } 1841 1842 static int kvm_s390_get_machine_subfunc(struct kvm *kvm, 1843 struct kvm_device_attr *attr) 1844 { 1845 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, 1846 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1847 return -EFAULT; 1848 1849 VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1850 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0], 1851 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1], 1852 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2], 1853 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]); 1854 VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx", 1855 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0], 1856 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]); 1857 VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx", 1858 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0], 1859 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]); 1860 VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx", 1861 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0], 1862 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]); 1863 VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx", 1864 ((unsigned long *) &kvm_s390_available_subfunc.km)[0], 1865 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]); 1866 VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx", 1867 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0], 1868 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]); 1869 VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx", 1870 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0], 1871 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]); 1872 VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx", 1873 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0], 1874 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]); 1875 VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx", 1876 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0], 1877 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]); 1878 VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx", 1879 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0], 1880 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]); 1881 VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx", 1882 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0], 1883 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]); 1884 VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx", 1885 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0], 1886 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]); 1887 VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx", 1888 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0], 1889 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]); 1890 VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx", 1891 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0], 1892 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]); 1893 VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx", 1894 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0], 1895 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]); 1896 VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1897 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0], 1898 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1], 1899 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2], 1900 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]); 1901 VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1902 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0], 1903 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1], 1904 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2], 1905 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]); 1906 VM_EVENT(kvm, 3, "GET: host PFCR subfunc 0x%16.16lx.%16.16lx", 1907 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1908 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1909 1910 return 0; 1911 } 1912 1913 static int kvm_s390_get_processor_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1914 { 1915 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; 1916 unsigned long feat = kvm->arch.model.uv_feat_guest.feat; 1917 1918 if (put_user(feat, &dst->feat)) 1919 return -EFAULT; 1920 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); 1921 1922 return 0; 1923 } 1924 1925 static int kvm_s390_get_machine_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1926 { 1927 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; 1928 unsigned long feat; 1929 1930 BUILD_BUG_ON(sizeof(*dst) != sizeof(uv_info.uv_feature_indications)); 1931 1932 feat = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; 1933 if (put_user(feat, &dst->feat)) 1934 return -EFAULT; 1935 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); 1936 1937 return 0; 1938 } 1939 1940 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1941 { 1942 int ret = -ENXIO; 1943 1944 switch (attr->attr) { 1945 case KVM_S390_VM_CPU_PROCESSOR: 1946 ret = kvm_s390_get_processor(kvm, attr); 1947 break; 1948 case KVM_S390_VM_CPU_MACHINE: 1949 ret = kvm_s390_get_machine(kvm, attr); 1950 break; 1951 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1952 ret = kvm_s390_get_processor_feat(kvm, attr); 1953 break; 1954 case KVM_S390_VM_CPU_MACHINE_FEAT: 1955 ret = kvm_s390_get_machine_feat(kvm, attr); 1956 break; 1957 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1958 ret = kvm_s390_get_processor_subfunc(kvm, attr); 1959 break; 1960 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1961 ret = kvm_s390_get_machine_subfunc(kvm, attr); 1962 break; 1963 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 1964 ret = kvm_s390_get_processor_uv_feat(kvm, attr); 1965 break; 1966 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: 1967 ret = kvm_s390_get_machine_uv_feat(kvm, attr); 1968 break; 1969 } 1970 return ret; 1971 } 1972 1973 /** 1974 * kvm_s390_update_topology_change_report - update CPU topology change report 1975 * @kvm: guest KVM description 1976 * @val: set or clear the MTCR bit 1977 * 1978 * Updates the Multiprocessor Topology-Change-Report bit to signal 1979 * the guest with a topology change. 1980 * This is only relevant if the topology facility is present. 1981 */ 1982 static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val) 1983 { 1984 union sca_utility new, old; 1985 struct esca_block *sca; 1986 1987 sca = kvm->arch.sca; 1988 old = READ_ONCE(sca->utility); 1989 do { 1990 new = old; 1991 new.mtcr = val; 1992 } while (!try_cmpxchg(&sca->utility.val, &old.val, new.val)); 1993 } 1994 1995 static int kvm_s390_set_topo_change_indication(struct kvm *kvm, 1996 struct kvm_device_attr *attr) 1997 { 1998 if (!test_kvm_facility(kvm, 11)) 1999 return -ENXIO; 2000 2001 kvm_s390_update_topology_change_report(kvm, !!attr->attr); 2002 return 0; 2003 } 2004 2005 static int kvm_s390_get_topo_change_indication(struct kvm *kvm, 2006 struct kvm_device_attr *attr) 2007 { 2008 u8 topo; 2009 2010 if (!test_kvm_facility(kvm, 11)) 2011 return -ENXIO; 2012 2013 topo = kvm->arch.sca->utility.mtcr; 2014 2015 return put_user(topo, (u8 __user *)attr->addr); 2016 } 2017 2018 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2019 { 2020 int ret; 2021 2022 switch (attr->group) { 2023 case KVM_S390_VM_MEM_CTRL: 2024 ret = kvm_s390_set_mem_control(kvm, attr); 2025 break; 2026 case KVM_S390_VM_TOD: 2027 ret = kvm_s390_set_tod(kvm, attr); 2028 break; 2029 case KVM_S390_VM_CPU_MODEL: 2030 ret = kvm_s390_set_cpu_model(kvm, attr); 2031 break; 2032 case KVM_S390_VM_CRYPTO: 2033 ret = kvm_s390_vm_set_crypto(kvm, attr); 2034 break; 2035 case KVM_S390_VM_MIGRATION: 2036 ret = kvm_s390_vm_set_migration(kvm, attr); 2037 break; 2038 case KVM_S390_VM_CPU_TOPOLOGY: 2039 ret = kvm_s390_set_topo_change_indication(kvm, attr); 2040 break; 2041 default: 2042 ret = -ENXIO; 2043 break; 2044 } 2045 2046 return ret; 2047 } 2048 2049 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2050 { 2051 int ret; 2052 2053 switch (attr->group) { 2054 case KVM_S390_VM_MEM_CTRL: 2055 ret = kvm_s390_get_mem_control(kvm, attr); 2056 break; 2057 case KVM_S390_VM_TOD: 2058 ret = kvm_s390_get_tod(kvm, attr); 2059 break; 2060 case KVM_S390_VM_CPU_MODEL: 2061 ret = kvm_s390_get_cpu_model(kvm, attr); 2062 break; 2063 case KVM_S390_VM_MIGRATION: 2064 ret = kvm_s390_vm_get_migration(kvm, attr); 2065 break; 2066 case KVM_S390_VM_CPU_TOPOLOGY: 2067 ret = kvm_s390_get_topo_change_indication(kvm, attr); 2068 break; 2069 default: 2070 ret = -ENXIO; 2071 break; 2072 } 2073 2074 return ret; 2075 } 2076 2077 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2078 { 2079 int ret; 2080 2081 switch (attr->group) { 2082 case KVM_S390_VM_MEM_CTRL: 2083 switch (attr->attr) { 2084 case KVM_S390_VM_MEM_ENABLE_CMMA: 2085 case KVM_S390_VM_MEM_CLR_CMMA: 2086 ret = sclp.has_cmma ? 0 : -ENXIO; 2087 break; 2088 case KVM_S390_VM_MEM_LIMIT_SIZE: 2089 ret = 0; 2090 break; 2091 default: 2092 ret = -ENXIO; 2093 break; 2094 } 2095 break; 2096 case KVM_S390_VM_TOD: 2097 switch (attr->attr) { 2098 case KVM_S390_VM_TOD_LOW: 2099 case KVM_S390_VM_TOD_HIGH: 2100 ret = 0; 2101 break; 2102 default: 2103 ret = -ENXIO; 2104 break; 2105 } 2106 break; 2107 case KVM_S390_VM_CPU_MODEL: 2108 switch (attr->attr) { 2109 case KVM_S390_VM_CPU_PROCESSOR: 2110 case KVM_S390_VM_CPU_MACHINE: 2111 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 2112 case KVM_S390_VM_CPU_MACHINE_FEAT: 2113 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 2114 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 2115 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: 2116 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 2117 ret = 0; 2118 break; 2119 default: 2120 ret = -ENXIO; 2121 break; 2122 } 2123 break; 2124 case KVM_S390_VM_CRYPTO: 2125 switch (attr->attr) { 2126 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 2127 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 2128 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 2129 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 2130 ret = 0; 2131 break; 2132 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 2133 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 2134 ret = ap_instructions_available() ? 0 : -ENXIO; 2135 break; 2136 default: 2137 ret = -ENXIO; 2138 break; 2139 } 2140 break; 2141 case KVM_S390_VM_MIGRATION: 2142 ret = 0; 2143 break; 2144 case KVM_S390_VM_CPU_TOPOLOGY: 2145 ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO; 2146 break; 2147 default: 2148 ret = -ENXIO; 2149 break; 2150 } 2151 2152 return ret; 2153 } 2154 2155 static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 2156 { 2157 union skey *keys; 2158 int i, r = 0; 2159 2160 if (args->flags != 0) 2161 return -EINVAL; 2162 2163 /* Is this guest using storage keys? */ 2164 if (!uses_skeys(kvm->arch.gmap)) 2165 return KVM_S390_GET_SKEYS_NONE; 2166 2167 /* Enforce sane limit on memory allocation */ 2168 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 2169 return -EINVAL; 2170 2171 keys = kvmalloc_objs(*keys, args->count, GFP_KERNEL_ACCOUNT); 2172 if (!keys) 2173 return -ENOMEM; 2174 2175 scoped_guard(read_lock, &kvm->mmu_lock) { 2176 for (i = 0; i < args->count; i++) { 2177 r = dat_get_storage_key(kvm->arch.gmap->asce, 2178 args->start_gfn + i, keys + i); 2179 if (r) 2180 break; 2181 } 2182 } 2183 2184 if (!r) { 2185 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 2186 sizeof(uint8_t) * args->count); 2187 if (r) 2188 r = -EFAULT; 2189 } 2190 2191 kvfree(keys); 2192 return r <= 0 ? r : -EFAULT; 2193 } 2194 2195 static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 2196 { 2197 struct kvm_s390_mmu_cache *mc; 2198 union skey *keys; 2199 int i, r = 0; 2200 2201 if (args->flags != 0) 2202 return -EINVAL; 2203 2204 /* Enforce sane limit on memory allocation */ 2205 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 2206 return -EINVAL; 2207 2208 keys = kvmalloc_objs(*keys, args->count, GFP_KERNEL_ACCOUNT); 2209 if (!keys) 2210 return -ENOMEM; 2211 2212 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 2213 sizeof(uint8_t) * args->count); 2214 if (r) { 2215 r = -EFAULT; 2216 goto out; 2217 } 2218 2219 /* Enable storage key handling for the guest */ 2220 r = gmap_enable_skeys(kvm->arch.gmap); 2221 if (r) 2222 goto out; 2223 2224 r = -EINVAL; 2225 for (i = 0; i < args->count; i++) { 2226 /* Lowest order bit is reserved */ 2227 if (keys[i].zero) 2228 goto out; 2229 } 2230 2231 mc = kvm_s390_new_mmu_cache(); 2232 if (!mc) { 2233 r = -ENOMEM; 2234 goto out; 2235 } 2236 2237 r = 0; 2238 do { 2239 r = kvm_s390_mmu_cache_topup(mc); 2240 if (r == -ENOMEM) 2241 break; 2242 scoped_guard(read_lock, &kvm->mmu_lock) { 2243 for (i = 0 ; i < args->count; i++) { 2244 r = dat_set_storage_key(mc, kvm->arch.gmap->asce, 2245 args->start_gfn + i, keys[i], 0); 2246 if (r) 2247 break; 2248 } 2249 } 2250 } while (r == -ENOMEM); 2251 kvm_s390_free_mmu_cache(mc); 2252 out: 2253 kvfree(keys); 2254 return r <= 0 ? r : -EFAULT; 2255 } 2256 2257 /* 2258 * This function searches for the next page with dirty CMMA attributes, and 2259 * saves the attributes in the buffer up to either the end of the buffer or 2260 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found; 2261 * no trailing clean bytes are saved. 2262 * In case no dirty bits were found, or if CMMA was not enabled or used, the 2263 * output buffer will indicate 0 as length. 2264 */ 2265 static int kvm_s390_get_cmma_bits(struct kvm *kvm, 2266 struct kvm_s390_cmma_log *args) 2267 { 2268 int peek, ret; 2269 u8 *values; 2270 2271 if (!kvm->arch.use_cmma) 2272 return -ENXIO; 2273 /* Invalid/unsupported flags were specified */ 2274 if (args->flags & ~KVM_S390_CMMA_PEEK) 2275 return -EINVAL; 2276 /* Migration mode query, and we are not doing a migration */ 2277 peek = !!(args->flags & KVM_S390_CMMA_PEEK); 2278 if (!peek && !kvm->arch.migration_mode) 2279 return -EINVAL; 2280 /* CMMA is disabled or was not used, or the buffer has length zero */ 2281 args->count = min(args->count, KVM_S390_CMMA_SIZE_MAX); 2282 if (!args->count || !uses_cmm(kvm->arch.gmap)) { 2283 memset(args, 0, sizeof(*args)); 2284 return 0; 2285 } 2286 /* We are not peeking, and there are no dirty pages */ 2287 if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) { 2288 memset(args, 0, sizeof(*args)); 2289 return 0; 2290 } 2291 2292 values = vzalloc(args->count); 2293 if (!values) 2294 return -ENOMEM; 2295 2296 scoped_guard(read_lock, &kvm->mmu_lock) { 2297 if (peek) 2298 ret = dat_peek_cmma(args->start_gfn, kvm->arch.gmap->asce, &args->count, 2299 values); 2300 else 2301 ret = dat_get_cmma(kvm->arch.gmap->asce, &args->start_gfn, &args->count, 2302 values, &kvm->arch.cmma_dirty_pages); 2303 } 2304 2305 if (kvm->arch.migration_mode) 2306 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages); 2307 else 2308 args->remaining = 0; 2309 2310 if (copy_to_user((void __user *)args->values, values, args->count)) 2311 ret = -EFAULT; 2312 2313 vfree(values); 2314 return ret; 2315 } 2316 2317 /* 2318 * This function sets the CMMA attributes for the given pages. If the input 2319 * buffer has zero length, no action is taken, otherwise the attributes are 2320 * set and the mm->context.uses_cmm flag is set. 2321 */ 2322 static int kvm_s390_set_cmma_bits(struct kvm *kvm, 2323 const struct kvm_s390_cmma_log *args) 2324 { 2325 struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL; 2326 u8 *bits __free(kvfree) = NULL; 2327 int r = 0; 2328 2329 if (!kvm->arch.use_cmma) 2330 return -ENXIO; 2331 /* invalid/unsupported flags */ 2332 if (args->flags != 0) 2333 return -EINVAL; 2334 /* Enforce sane limit on memory allocation */ 2335 if (args->count > KVM_S390_CMMA_SIZE_MAX) 2336 return -EINVAL; 2337 /* Nothing to do */ 2338 if (args->count == 0) 2339 return 0; 2340 2341 mc = kvm_s390_new_mmu_cache(); 2342 if (!mc) 2343 return -ENOMEM; 2344 bits = vmalloc(array_size(sizeof(*bits), args->count)); 2345 if (!bits) 2346 return -ENOMEM; 2347 2348 r = copy_from_user(bits, (void __user *)args->values, args->count); 2349 if (r) 2350 return -EFAULT; 2351 2352 do { 2353 r = kvm_s390_mmu_cache_topup(mc); 2354 if (r) 2355 return r; 2356 scoped_guard(read_lock, &kvm->mmu_lock) { 2357 r = dat_set_cmma_bits(mc, kvm->arch.gmap->asce, args->start_gfn, 2358 args->count, args->mask, bits); 2359 } 2360 } while (r == -ENOMEM); 2361 2362 set_bit(GMAP_FLAG_USES_CMM, &kvm->arch.gmap->flags); 2363 2364 return r <= 0 ? r : -EFAULT; 2365 } 2366 2367 /** 2368 * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to 2369 * non protected. 2370 * @kvm: the VM whose protected vCPUs are to be converted 2371 * @rc: return value for the RC field of the UVC (in case of error) 2372 * @rrc: return value for the RRC field of the UVC (in case of error) 2373 * 2374 * Does not stop in case of error, tries to convert as many 2375 * CPUs as possible. In case of error, the RC and RRC of the last error are 2376 * returned. 2377 * 2378 * Return: 0 in case of success, otherwise -EIO 2379 */ 2380 int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc) 2381 { 2382 struct kvm_vcpu *vcpu; 2383 unsigned long i; 2384 u16 _rc, _rrc; 2385 int ret = 0; 2386 2387 /* 2388 * We ignore failures and try to destroy as many CPUs as possible. 2389 * At the same time we must not free the assigned resources when 2390 * this fails, as the ultravisor has still access to that memory. 2391 * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak 2392 * behind. 2393 * We want to return the first failure rc and rrc, though. 2394 */ 2395 kvm_for_each_vcpu(i, vcpu, kvm) { 2396 mutex_lock(&vcpu->mutex); 2397 if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) { 2398 *rc = _rc; 2399 *rrc = _rrc; 2400 ret = -EIO; 2401 } 2402 mutex_unlock(&vcpu->mutex); 2403 } 2404 /* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */ 2405 if (use_gisa) 2406 kvm_s390_gisa_enable(kvm); 2407 return ret; 2408 } 2409 2410 /** 2411 * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM 2412 * to protected. 2413 * @kvm: the VM whose protected vCPUs are to be converted 2414 * @rc: return value for the RC field of the UVC (in case of error) 2415 * @rrc: return value for the RRC field of the UVC (in case of error) 2416 * 2417 * Tries to undo the conversion in case of error. 2418 * 2419 * Return: 0 in case of success, otherwise -EIO 2420 */ 2421 static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc) 2422 { 2423 unsigned long i; 2424 int r = 0; 2425 u16 dummy; 2426 2427 struct kvm_vcpu *vcpu; 2428 2429 /* Disable the GISA if the ultravisor does not support AIV. */ 2430 if (!uv_has_feature(BIT_UV_FEAT_AIV)) 2431 kvm_s390_gisa_disable(kvm); 2432 2433 kvm_for_each_vcpu(i, vcpu, kvm) { 2434 mutex_lock(&vcpu->mutex); 2435 r = kvm_s390_pv_create_cpu(vcpu, rc, rrc); 2436 mutex_unlock(&vcpu->mutex); 2437 if (r) 2438 break; 2439 } 2440 if (r) 2441 kvm_s390_cpus_from_pv(kvm, &dummy, &dummy); 2442 return r; 2443 } 2444 2445 /* 2446 * Here we provide user space with a direct interface to query UV 2447 * related data like UV maxima and available features as well as 2448 * feature specific data. 2449 * 2450 * To facilitate future extension of the data structures we'll try to 2451 * write data up to the maximum requested length. 2452 */ 2453 static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info) 2454 { 2455 ssize_t len_min; 2456 2457 switch (info->header.id) { 2458 case KVM_PV_INFO_VM: { 2459 len_min = sizeof(info->header) + sizeof(info->vm); 2460 2461 if (info->header.len_max < len_min) 2462 return -EINVAL; 2463 2464 memcpy(info->vm.inst_calls_list, 2465 uv_info.inst_calls_list, 2466 sizeof(uv_info.inst_calls_list)); 2467 2468 /* It's max cpuid not max cpus, so it's off by one */ 2469 info->vm.max_cpus = uv_info.max_guest_cpu_id + 1; 2470 info->vm.max_guests = uv_info.max_num_sec_conf; 2471 info->vm.max_guest_addr = uv_info.max_sec_stor_addr; 2472 info->vm.feature_indication = uv_info.uv_feature_indications; 2473 2474 return len_min; 2475 } 2476 case KVM_PV_INFO_DUMP: { 2477 len_min = sizeof(info->header) + sizeof(info->dump); 2478 2479 if (info->header.len_max < len_min) 2480 return -EINVAL; 2481 2482 info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len; 2483 info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len; 2484 info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len; 2485 return len_min; 2486 } 2487 default: 2488 return -EINVAL; 2489 } 2490 } 2491 2492 static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd, 2493 struct kvm_s390_pv_dmp dmp) 2494 { 2495 int r = -EINVAL; 2496 void __user *result_buff = (void __user *)dmp.buff_addr; 2497 2498 switch (dmp.subcmd) { 2499 case KVM_PV_DUMP_INIT: { 2500 if (kvm->arch.pv.dumping) 2501 break; 2502 2503 /* 2504 * Block SIE entry as concurrent dump UVCs could lead 2505 * to validities. 2506 */ 2507 kvm_s390_vcpu_block_all(kvm); 2508 2509 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2510 UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc); 2511 KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x", 2512 cmd->rc, cmd->rrc); 2513 if (!r) { 2514 kvm->arch.pv.dumping = true; 2515 } else { 2516 kvm_s390_vcpu_unblock_all(kvm); 2517 r = -EINVAL; 2518 } 2519 break; 2520 } 2521 case KVM_PV_DUMP_CONFIG_STOR_STATE: { 2522 if (!kvm->arch.pv.dumping) 2523 break; 2524 2525 /* 2526 * gaddr is an output parameter since we might stop 2527 * early. As dmp will be copied back in our caller, we 2528 * don't need to do it ourselves. 2529 */ 2530 r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len, 2531 &cmd->rc, &cmd->rrc); 2532 break; 2533 } 2534 case KVM_PV_DUMP_COMPLETE: { 2535 if (!kvm->arch.pv.dumping) 2536 break; 2537 2538 r = -EINVAL; 2539 if (dmp.buff_len < uv_info.conf_dump_finalize_len) 2540 break; 2541 2542 r = kvm_s390_pv_dump_complete(kvm, result_buff, 2543 &cmd->rc, &cmd->rrc); 2544 break; 2545 } 2546 default: 2547 r = -ENOTTY; 2548 break; 2549 } 2550 2551 return r; 2552 } 2553 2554 static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) 2555 { 2556 const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM); 2557 void __user *argp = (void __user *)cmd->data; 2558 int r = 0; 2559 u16 dummy; 2560 2561 if (need_lock) 2562 mutex_lock(&kvm->lock); 2563 2564 switch (cmd->cmd) { 2565 case KVM_PV_ENABLE: { 2566 r = -EINVAL; 2567 if (kvm_s390_pv_is_protected(kvm)) 2568 break; 2569 2570 kvm_s390_unmap_all_adapters(kvm); 2571 mmap_write_lock(kvm->mm); 2572 /* 2573 * Disable creation of new THPs. Existing THPs can stay, they 2574 * will be split when any part of them gets imported. 2575 */ 2576 mm_flags_clear(MMF_DISABLE_THP_EXCEPT_ADVISED, kvm->mm); 2577 mm_flags_set(MMF_DISABLE_THP_COMPLETELY, kvm->mm); 2578 set_bit(GMAP_FLAG_EXPORT_ON_UNMAP, &kvm->arch.gmap->flags); 2579 r = gmap_helper_disable_cow_sharing(); 2580 mmap_write_unlock(kvm->mm); 2581 if (r) 2582 break; 2583 2584 r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc); 2585 if (r) 2586 break; 2587 2588 r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc); 2589 if (r) 2590 kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy); 2591 2592 /* we need to block service interrupts from now on */ 2593 set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2594 break; 2595 } 2596 case KVM_PV_ASYNC_CLEANUP_PREPARE: 2597 r = -EINVAL; 2598 if (!kvm_s390_pv_is_protected(kvm) || !async_destroy) 2599 break; 2600 2601 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); 2602 /* 2603 * If a CPU could not be destroyed, destroy VM will also fail. 2604 * There is no point in trying to destroy it. Instead return 2605 * the rc and rrc from the first CPU that failed destroying. 2606 */ 2607 if (r) 2608 break; 2609 r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc); 2610 2611 /* no need to block service interrupts any more */ 2612 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2613 break; 2614 case KVM_PV_ASYNC_CLEANUP_PERFORM: 2615 r = -EINVAL; 2616 if (!async_destroy) 2617 break; 2618 /* kvm->lock must not be held; this is asserted inside the function. */ 2619 r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc); 2620 break; 2621 case KVM_PV_DISABLE: { 2622 r = -EINVAL; 2623 if (!kvm_s390_pv_is_protected(kvm)) 2624 break; 2625 2626 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); 2627 /* 2628 * If a CPU could not be destroyed, destroy VM will also fail. 2629 * There is no point in trying to destroy it. Instead return 2630 * the rc and rrc from the first CPU that failed destroying. 2631 */ 2632 if (r) 2633 break; 2634 r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc); 2635 2636 /* no need to block service interrupts any more */ 2637 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2638 break; 2639 } 2640 case KVM_PV_SET_SEC_PARMS: { 2641 struct kvm_s390_pv_sec_parm parms = {}; 2642 void *hdr; 2643 2644 r = -EINVAL; 2645 if (!kvm_s390_pv_is_protected(kvm)) 2646 break; 2647 2648 r = -EFAULT; 2649 if (copy_from_user(&parms, argp, sizeof(parms))) 2650 break; 2651 2652 /* Currently restricted to 1MiB */ 2653 r = -EINVAL; 2654 if (parms.length > SZ_1M) 2655 break; 2656 2657 r = -ENOMEM; 2658 hdr = vmalloc(parms.length); 2659 if (!hdr) 2660 break; 2661 2662 r = -EFAULT; 2663 if (!copy_from_user(hdr, (void __user *)parms.origin, 2664 parms.length)) 2665 r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length, 2666 &cmd->rc, &cmd->rrc); 2667 2668 vfree(hdr); 2669 break; 2670 } 2671 case KVM_PV_UNPACK: { 2672 struct kvm_s390_pv_unp unp = {}; 2673 2674 r = -EINVAL; 2675 if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm)) 2676 break; 2677 2678 r = -EFAULT; 2679 if (copy_from_user(&unp, argp, sizeof(unp))) 2680 break; 2681 2682 r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak, 2683 &cmd->rc, &cmd->rrc); 2684 break; 2685 } 2686 case KVM_PV_VERIFY: { 2687 r = -EINVAL; 2688 if (!kvm_s390_pv_is_protected(kvm)) 2689 break; 2690 2691 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2692 UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc); 2693 KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc, 2694 cmd->rrc); 2695 break; 2696 } 2697 case KVM_PV_PREP_RESET: { 2698 r = -EINVAL; 2699 if (!kvm_s390_pv_is_protected(kvm)) 2700 break; 2701 2702 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2703 UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc); 2704 KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x", 2705 cmd->rc, cmd->rrc); 2706 break; 2707 } 2708 case KVM_PV_UNSHARE_ALL: { 2709 r = -EINVAL; 2710 if (!kvm_s390_pv_is_protected(kvm)) 2711 break; 2712 2713 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2714 UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc); 2715 KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x", 2716 cmd->rc, cmd->rrc); 2717 break; 2718 } 2719 case KVM_PV_INFO: { 2720 struct kvm_s390_pv_info info = {}; 2721 ssize_t data_len; 2722 2723 /* 2724 * No need to check the VM protection here. 2725 * 2726 * Maybe user space wants to query some of the data 2727 * when the VM is still unprotected. If we see the 2728 * need to fence a new data command we can still 2729 * return an error in the info handler. 2730 */ 2731 2732 r = -EFAULT; 2733 if (copy_from_user(&info, argp, sizeof(info.header))) 2734 break; 2735 2736 r = -EINVAL; 2737 if (info.header.len_max < sizeof(info.header)) 2738 break; 2739 2740 data_len = kvm_s390_handle_pv_info(&info); 2741 if (data_len < 0) { 2742 r = data_len; 2743 break; 2744 } 2745 /* 2746 * If a data command struct is extended (multiple 2747 * times) this can be used to determine how much of it 2748 * is valid. 2749 */ 2750 info.header.len_written = data_len; 2751 2752 r = -EFAULT; 2753 if (copy_to_user(argp, &info, data_len)) 2754 break; 2755 2756 r = 0; 2757 break; 2758 } 2759 case KVM_PV_DUMP: { 2760 struct kvm_s390_pv_dmp dmp; 2761 2762 r = -EINVAL; 2763 if (!kvm_s390_pv_is_protected(kvm)) 2764 break; 2765 2766 r = -EFAULT; 2767 if (copy_from_user(&dmp, argp, sizeof(dmp))) 2768 break; 2769 2770 r = kvm_s390_pv_dmp(kvm, cmd, dmp); 2771 if (r) 2772 break; 2773 2774 if (copy_to_user(argp, &dmp, sizeof(dmp))) { 2775 r = -EFAULT; 2776 break; 2777 } 2778 2779 break; 2780 } 2781 default: 2782 r = -ENOTTY; 2783 } 2784 if (need_lock) 2785 mutex_unlock(&kvm->lock); 2786 2787 return r; 2788 } 2789 2790 static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags) 2791 { 2792 if (mop->flags & ~supported_flags || !mop->size) 2793 return -EINVAL; 2794 if (mop->size > MEM_OP_MAX_SIZE) 2795 return -E2BIG; 2796 if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { 2797 if (mop->key > 0xf) 2798 return -EINVAL; 2799 } else { 2800 mop->key = 0; 2801 } 2802 return 0; 2803 } 2804 2805 static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2806 { 2807 void __user *uaddr = (void __user *)mop->buf; 2808 void *tmpbuf __free(kvfree) = NULL; 2809 enum gacc_mode acc_mode; 2810 int r; 2811 2812 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION | 2813 KVM_S390_MEMOP_F_CHECK_ONLY); 2814 if (r) 2815 return r; 2816 2817 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 2818 tmpbuf = vmalloc(mop->size); 2819 if (!tmpbuf) 2820 return -ENOMEM; 2821 } 2822 2823 acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE; 2824 2825 scoped_guard(srcu, &kvm->srcu) { 2826 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) 2827 return check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key); 2828 2829 if (acc_mode == GACC_STORE && copy_from_user(tmpbuf, uaddr, mop->size)) 2830 return -EFAULT; 2831 r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, 2832 mop->size, acc_mode, mop->key); 2833 if (r) 2834 return r; 2835 if (acc_mode != GACC_STORE && copy_to_user(uaddr, tmpbuf, mop->size)) 2836 return -EFAULT; 2837 } 2838 return 0; 2839 } 2840 2841 static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2842 { 2843 void __user *uaddr = (void __user *)mop->buf; 2844 void __user *old_addr = (void __user *)mop->old_addr; 2845 union kvm_s390_quad old = { .sixteen = 0 }; 2846 union kvm_s390_quad new = { .sixteen = 0 }; 2847 bool success = false; 2848 int r; 2849 2850 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION); 2851 if (r) 2852 return r; 2853 /* 2854 * This validates off_in_quad. Checking that size is a power 2855 * of two is not necessary, as cmpxchg_guest_abs_with_key 2856 * takes care of that 2857 */ 2858 if (mop->size > sizeof(new)) 2859 return -EINVAL; 2860 if (copy_from_user(&new, uaddr, mop->size)) 2861 return -EFAULT; 2862 if (copy_from_user(&old, old_addr, mop->size)) 2863 return -EFAULT; 2864 2865 scoped_guard(srcu, &kvm->srcu) { 2866 r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old, new, 2867 mop->key, &success); 2868 2869 if (!success && copy_to_user(old_addr, &old, mop->size)) 2870 return -EFAULT; 2871 } 2872 return r; 2873 } 2874 2875 static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2876 { 2877 /* 2878 * This is technically a heuristic only, if the kvm->lock is not 2879 * taken, it is not guaranteed that the vm is/remains non-protected. 2880 * This is ok from a kernel perspective, wrongdoing is detected 2881 * on the access, -EFAULT is returned and the vm may crash the 2882 * next time it accesses the memory in question. 2883 * There is no sane usecase to do switching and a memop on two 2884 * different CPUs at the same time. 2885 */ 2886 if (kvm_s390_pv_get_handle(kvm)) 2887 return -EINVAL; 2888 2889 switch (mop->op) { 2890 case KVM_S390_MEMOP_ABSOLUTE_READ: 2891 case KVM_S390_MEMOP_ABSOLUTE_WRITE: 2892 return kvm_s390_vm_mem_op_abs(kvm, mop); 2893 case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG: 2894 return kvm_s390_vm_mem_op_cmpxchg(kvm, mop); 2895 default: 2896 return -EINVAL; 2897 } 2898 } 2899 2900 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) 2901 { 2902 struct kvm *kvm = filp->private_data; 2903 void __user *argp = (void __user *)arg; 2904 struct kvm_device_attr attr; 2905 int r; 2906 struct kvm_s390_interrupt_info *inti; 2907 2908 switch (ioctl) { 2909 case KVM_S390_INTERRUPT: { 2910 struct kvm_s390_interrupt s390int; 2911 2912 r = -EINVAL; 2913 if (kvm_is_ucontrol(kvm)) 2914 break; 2915 r = -EFAULT; 2916 if (copy_from_user(&s390int, argp, sizeof(s390int))) 2917 break; 2918 inti = kzalloc_obj(*inti, GFP_KERNEL_ACCOUNT); 2919 if (!inti) 2920 return -ENOMEM; 2921 r = kvm_s390_inject_vm(kvm, &s390int, inti); 2922 if (r) 2923 kfree(inti); 2924 break; 2925 } 2926 case KVM_CREATE_IRQCHIP: { 2927 r = -EINVAL; 2928 if (kvm->arch.use_irqchip) 2929 r = 0; 2930 break; 2931 } 2932 case KVM_SET_DEVICE_ATTR: { 2933 r = -EFAULT; 2934 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2935 break; 2936 r = kvm_s390_vm_set_attr(kvm, &attr); 2937 break; 2938 } 2939 case KVM_GET_DEVICE_ATTR: { 2940 r = -EFAULT; 2941 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2942 break; 2943 r = kvm_s390_vm_get_attr(kvm, &attr); 2944 break; 2945 } 2946 case KVM_HAS_DEVICE_ATTR: { 2947 r = -EFAULT; 2948 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2949 break; 2950 r = kvm_s390_vm_has_attr(kvm, &attr); 2951 break; 2952 } 2953 case KVM_S390_GET_SKEYS: { 2954 struct kvm_s390_skeys args; 2955 2956 r = -EFAULT; 2957 if (copy_from_user(&args, argp, 2958 sizeof(struct kvm_s390_skeys))) 2959 break; 2960 r = kvm_s390_get_skeys(kvm, &args); 2961 break; 2962 } 2963 case KVM_S390_SET_SKEYS: { 2964 struct kvm_s390_skeys args; 2965 2966 r = -EFAULT; 2967 if (copy_from_user(&args, argp, 2968 sizeof(struct kvm_s390_skeys))) 2969 break; 2970 r = kvm_s390_set_skeys(kvm, &args); 2971 break; 2972 } 2973 case KVM_S390_GET_CMMA_BITS: { 2974 struct kvm_s390_cmma_log args; 2975 2976 r = -EFAULT; 2977 if (copy_from_user(&args, argp, sizeof(args))) 2978 break; 2979 scoped_guard(mutex, &kvm->slots_arch_lock) 2980 r = kvm_s390_get_cmma_bits(kvm, &args); 2981 if (!r) { 2982 r = copy_to_user(argp, &args, sizeof(args)); 2983 if (r) 2984 r = -EFAULT; 2985 } 2986 break; 2987 } 2988 case KVM_S390_SET_CMMA_BITS: { 2989 struct kvm_s390_cmma_log args; 2990 2991 r = -EFAULT; 2992 if (copy_from_user(&args, argp, sizeof(args))) 2993 break; 2994 mutex_lock(&kvm->slots_arch_lock); 2995 r = kvm_s390_set_cmma_bits(kvm, &args); 2996 mutex_unlock(&kvm->slots_arch_lock); 2997 break; 2998 } 2999 case KVM_S390_PV_COMMAND: { 3000 struct kvm_pv_cmd args; 3001 3002 /* protvirt means user cpu state */ 3003 kvm_s390_set_user_cpu_state_ctrl(kvm); 3004 r = 0; 3005 if (!is_prot_virt_host()) { 3006 r = -EINVAL; 3007 break; 3008 } 3009 if (copy_from_user(&args, argp, sizeof(args))) { 3010 r = -EFAULT; 3011 break; 3012 } 3013 if (args.flags) { 3014 r = -EINVAL; 3015 break; 3016 } 3017 /* must be called without kvm->lock */ 3018 r = kvm_s390_handle_pv(kvm, &args); 3019 if (copy_to_user(argp, &args, sizeof(args))) { 3020 r = -EFAULT; 3021 break; 3022 } 3023 break; 3024 } 3025 case KVM_S390_MEM_OP: { 3026 struct kvm_s390_mem_op mem_op; 3027 3028 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 3029 r = kvm_s390_vm_mem_op(kvm, &mem_op); 3030 else 3031 r = -EFAULT; 3032 break; 3033 } 3034 case KVM_S390_KEYOP: { 3035 struct kvm_s390_mmu_cache *mc; 3036 struct kvm_s390_keyop kop; 3037 union skey skey; 3038 3039 if (copy_from_user(&kop, argp, sizeof(kop))) { 3040 r = -EFAULT; 3041 break; 3042 } 3043 skey.skey = kop.key; 3044 3045 mc = kvm_s390_new_mmu_cache(); 3046 if (!mc) 3047 return -ENOMEM; 3048 3049 r = kvm_s390_keyop(mc, kvm, kop.operation, kop.guest_addr, skey); 3050 kvm_s390_free_mmu_cache(mc); 3051 if (r < 0) 3052 break; 3053 3054 kop.key = r; 3055 r = 0; 3056 if (copy_to_user(argp, &kop, sizeof(kop))) 3057 r = -EFAULT; 3058 break; 3059 } 3060 case KVM_S390_ZPCI_OP: { 3061 struct kvm_s390_zpci_op args; 3062 3063 r = -EINVAL; 3064 if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 3065 break; 3066 if (copy_from_user(&args, argp, sizeof(args))) { 3067 r = -EFAULT; 3068 break; 3069 } 3070 r = kvm_s390_pci_zpci_op(kvm, &args); 3071 break; 3072 } 3073 default: 3074 r = -ENOTTY; 3075 } 3076 3077 return r; 3078 } 3079 3080 static int kvm_s390_apxa_installed(void) 3081 { 3082 struct ap_config_info info; 3083 3084 if (ap_instructions_available()) { 3085 if (ap_qci(&info) == 0) 3086 return info.apxa; 3087 } 3088 3089 return 0; 3090 } 3091 3092 /* 3093 * The format of the crypto control block (CRYCB) is specified in the 3 low 3094 * order bits of the CRYCB designation (CRYCBD) field as follows: 3095 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the 3096 * AP extended addressing (APXA) facility are installed. 3097 * Format 1: The APXA facility is not installed but the MSAX3 facility is. 3098 * Format 2: Both the APXA and MSAX3 facilities are installed 3099 */ 3100 static void kvm_s390_set_crycb_format(struct kvm *kvm) 3101 { 3102 kvm->arch.crypto.crycbd = virt_to_phys(kvm->arch.crypto.crycb); 3103 3104 /* Clear the CRYCB format bits - i.e., set format 0 by default */ 3105 kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK); 3106 3107 /* Check whether MSAX3 is installed */ 3108 if (!test_kvm_facility(kvm, 76)) 3109 return; 3110 3111 if (kvm_s390_apxa_installed()) 3112 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 3113 else 3114 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 3115 } 3116 3117 /* 3118 * kvm_arch_crypto_set_masks 3119 * 3120 * @kvm: pointer to the target guest's KVM struct containing the crypto masks 3121 * to be set. 3122 * @apm: the mask identifying the accessible AP adapters 3123 * @aqm: the mask identifying the accessible AP domains 3124 * @adm: the mask identifying the accessible AP control domains 3125 * 3126 * Set the masks that identify the adapters, domains and control domains to 3127 * which the KVM guest is granted access. 3128 * 3129 * Note: The kvm->lock mutex must be locked by the caller before invoking this 3130 * function. 3131 */ 3132 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, 3133 unsigned long *aqm, unsigned long *adm) 3134 { 3135 struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb; 3136 3137 kvm_s390_vcpu_block_all(kvm); 3138 3139 switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { 3140 case CRYCB_FORMAT2: /* APCB1 use 256 bits */ 3141 memcpy(crycb->apcb1.apm, apm, 32); 3142 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx", 3143 apm[0], apm[1], apm[2], apm[3]); 3144 memcpy(crycb->apcb1.aqm, aqm, 32); 3145 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx", 3146 aqm[0], aqm[1], aqm[2], aqm[3]); 3147 memcpy(crycb->apcb1.adm, adm, 32); 3148 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx", 3149 adm[0], adm[1], adm[2], adm[3]); 3150 break; 3151 case CRYCB_FORMAT1: 3152 case CRYCB_FORMAT0: /* Fall through both use APCB0 */ 3153 memcpy(crycb->apcb0.apm, apm, 8); 3154 memcpy(crycb->apcb0.aqm, aqm, 2); 3155 memcpy(crycb->apcb0.adm, adm, 2); 3156 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x", 3157 apm[0], *((unsigned short *)aqm), 3158 *((unsigned short *)adm)); 3159 break; 3160 default: /* Can not happen */ 3161 break; 3162 } 3163 3164 /* recreate the shadow crycb for each vcpu */ 3165 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 3166 kvm_s390_vcpu_unblock_all(kvm); 3167 } 3168 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks); 3169 3170 /* 3171 * kvm_arch_crypto_clear_masks 3172 * 3173 * @kvm: pointer to the target guest's KVM struct containing the crypto masks 3174 * to be cleared. 3175 * 3176 * Clear the masks that identify the adapters, domains and control domains to 3177 * which the KVM guest is granted access. 3178 * 3179 * Note: The kvm->lock mutex must be locked by the caller before invoking this 3180 * function. 3181 */ 3182 void kvm_arch_crypto_clear_masks(struct kvm *kvm) 3183 { 3184 kvm_s390_vcpu_block_all(kvm); 3185 3186 memset(&kvm->arch.crypto.crycb->apcb0, 0, 3187 sizeof(kvm->arch.crypto.crycb->apcb0)); 3188 memset(&kvm->arch.crypto.crycb->apcb1, 0, 3189 sizeof(kvm->arch.crypto.crycb->apcb1)); 3190 3191 VM_EVENT(kvm, 3, "%s", "CLR CRYCB:"); 3192 /* recreate the shadow crycb for each vcpu */ 3193 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 3194 kvm_s390_vcpu_unblock_all(kvm); 3195 } 3196 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks); 3197 3198 static u64 kvm_s390_get_initial_cpuid(void) 3199 { 3200 struct cpuid cpuid; 3201 3202 get_cpu_id(&cpuid); 3203 cpuid.version = 0xff; 3204 return *((u64 *) &cpuid); 3205 } 3206 3207 static void kvm_s390_crypto_init(struct kvm *kvm) 3208 { 3209 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; 3210 kvm_s390_set_crycb_format(kvm); 3211 init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem); 3212 3213 if (!test_kvm_facility(kvm, 76)) 3214 return; 3215 3216 /* Enable AES/DEA protected key functions by default */ 3217 kvm->arch.crypto.aes_kw = 1; 3218 kvm->arch.crypto.dea_kw = 1; 3219 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 3220 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 3221 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 3222 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 3223 } 3224 3225 static void sca_dispose(struct kvm *kvm) 3226 { 3227 if (kvm->arch.sca) 3228 free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca)); 3229 kvm->arch.sca = NULL; 3230 } 3231 3232 void kvm_arch_free_vm(struct kvm *kvm) 3233 { 3234 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 3235 kvm_s390_pci_clear_list(kvm); 3236 3237 __kvm_arch_free_vm(kvm); 3238 } 3239 3240 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 3241 { 3242 gfp_t alloc_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO; 3243 char debug_name[16]; 3244 int i, rc; 3245 3246 mutex_init(&kvm->arch.pv.import_lock); 3247 3248 rc = -EINVAL; 3249 #ifdef CONFIG_KVM_S390_UCONTROL 3250 if (type & ~KVM_VM_S390_UCONTROL) 3251 goto out_err; 3252 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 3253 goto out_err; 3254 #else 3255 if (type) 3256 goto out_err; 3257 #endif 3258 rc = -ENOMEM; 3259 3260 if (!sclp.has_64bscao) 3261 alloc_flags |= GFP_DMA; 3262 mutex_lock(&kvm_lock); 3263 3264 kvm->arch.sca = alloc_pages_exact(sizeof(*kvm->arch.sca), alloc_flags); 3265 mutex_unlock(&kvm_lock); 3266 if (!kvm->arch.sca) 3267 goto out_err; 3268 3269 snprintf(debug_name, sizeof(debug_name), "kvm-%u", current->pid); 3270 3271 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 3272 if (!kvm->arch.dbf) 3273 goto out_err; 3274 3275 BUILD_BUG_ON(sizeof(struct sie_page2) != 4096); 3276 kvm->arch.sie_page2 = 3277 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA); 3278 if (!kvm->arch.sie_page2) 3279 goto out_err; 3280 3281 kvm->arch.sie_page2->kvm = kvm; 3282 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; 3283 3284 for (i = 0; i < ARRAY_SIZE(kvm_s390_fac_base); i++) { 3285 kvm->arch.model.fac_mask[i] = stfle_fac_list[i] & 3286 kvm_s390_fac_base[i]; 3287 kvm->arch.model.fac_list[i] = stfle_fac_list[i] & 3288 kvm_s390_fac_base[i]; 3289 } 3290 for (i = 0; i < ARRAY_SIZE(kvm_s390_fac_ext); i++) { 3291 kvm->arch.model.fac_mask[i] |= stfle_fac_list[i] & 3292 kvm_s390_fac_ext[i]; 3293 } 3294 kvm->arch.model.subfuncs = kvm_s390_available_subfunc; 3295 3296 /* we are always in czam mode - even on pre z14 machines */ 3297 set_kvm_facility(kvm->arch.model.fac_mask, 138); 3298 set_kvm_facility(kvm->arch.model.fac_list, 138); 3299 /* we emulate STHYI in kvm */ 3300 set_kvm_facility(kvm->arch.model.fac_mask, 74); 3301 set_kvm_facility(kvm->arch.model.fac_list, 74); 3302 if (machine_has_tlb_guest()) { 3303 set_kvm_facility(kvm->arch.model.fac_mask, 147); 3304 set_kvm_facility(kvm->arch.model.fac_list, 147); 3305 } 3306 3307 if (css_general_characteristics.aiv && test_facility(65)) 3308 set_kvm_facility(kvm->arch.model.fac_mask, 65); 3309 3310 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); 3311 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 3312 3313 kvm->arch.model.uv_feat_guest.feat = 0; 3314 3315 kvm_s390_crypto_init(kvm); 3316 3317 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { 3318 mutex_lock(&kvm->lock); 3319 kvm_s390_pci_init_list(kvm); 3320 kvm_s390_vcpu_pci_enable_interp(kvm); 3321 mutex_unlock(&kvm->lock); 3322 } 3323 3324 spin_lock_init(&kvm->arch.float_int.ais_lock); 3325 spin_lock_init(&kvm->arch.float_int.lock); 3326 for (i = 0; i < FIRQ_LIST_COUNT; i++) 3327 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 3328 init_waitqueue_head(&kvm->arch.ipte_wq); 3329 mutex_init(&kvm->arch.ipte_mutex); 3330 3331 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 3332 VM_EVENT(kvm, 3, "vm created with type %lu", type); 3333 3334 kvm->arch.mem_limit = type & KVM_VM_S390_UCONTROL ? KVM_S390_NO_MEM_LIMIT : sclp.hamax + 1; 3335 kvm->arch.gmap = gmap_new(kvm, gpa_to_gfn(kvm->arch.mem_limit)); 3336 if (!kvm->arch.gmap) 3337 goto out_err; 3338 clear_bit(GMAP_FLAG_PFAULT_ENABLED, &kvm->arch.gmap->flags); 3339 3340 if (type & KVM_VM_S390_UCONTROL) { 3341 struct kvm_userspace_memory_region2 fake_memslot = { 3342 .slot = KVM_S390_UCONTROL_MEMSLOT, 3343 .guest_phys_addr = 0, 3344 .userspace_addr = 0, 3345 .memory_size = ALIGN_DOWN(TASK_SIZE, _SEGMENT_SIZE), 3346 .flags = 0, 3347 }; 3348 3349 /* one flat fake memslot covering the whole address-space */ 3350 mutex_lock(&kvm->slots_lock); 3351 KVM_BUG_ON(kvm_set_internal_memslot(kvm, &fake_memslot), kvm); 3352 mutex_unlock(&kvm->slots_lock); 3353 set_bit(GMAP_FLAG_IS_UCONTROL, &kvm->arch.gmap->flags); 3354 } else { 3355 struct crst_table *table = dereference_asce(kvm->arch.gmap->asce); 3356 3357 crst_table_init((void *)table, _CRSTE_HOLE(table->crstes[0].h.tt).val); 3358 } 3359 3360 kvm->arch.use_pfmfi = sclp.has_pfmfi; 3361 kvm->arch.use_skf = sclp.has_skey; 3362 spin_lock_init(&kvm->arch.start_stop_lock); 3363 kvm_s390_vsie_init(kvm); 3364 if (use_gisa) 3365 kvm_s390_gisa_init(kvm); 3366 INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup); 3367 kvm->arch.pv.set_aside = NULL; 3368 KVM_EVENT(3, "vm 0x%p created by pid %u", kvm, current->pid); 3369 3370 return 0; 3371 out_err: 3372 free_page((unsigned long)kvm->arch.sie_page2); 3373 debug_unregister(kvm->arch.dbf); 3374 sca_dispose(kvm); 3375 KVM_EVENT(3, "creation of vm failed: %d", rc); 3376 return rc; 3377 } 3378 3379 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 3380 { 3381 u16 rc, rrc; 3382 3383 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 3384 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 3385 kvm_s390_clear_local_irqs(vcpu); 3386 kvm_clear_async_pf_completion_queue(vcpu); 3387 kvm_s390_clear_bp_data(vcpu); 3388 if (!kvm_is_ucontrol(vcpu->kvm)) 3389 sca_del_vcpu(vcpu); 3390 kvm_s390_update_topology_change_report(vcpu->kvm, 1); 3391 3392 if (kvm_is_ucontrol(vcpu->kvm)) { 3393 scoped_guard(spinlock, &vcpu->kvm->arch.gmap->children_lock) 3394 gmap_remove_child(vcpu->arch.gmap); 3395 vcpu->arch.gmap = gmap_put(vcpu->arch.gmap); 3396 } 3397 3398 if (vcpu->kvm->arch.use_cmma) 3399 kvm_s390_vcpu_unsetup_cmma(vcpu); 3400 /* We can not hold the vcpu mutex here, we are already dying */ 3401 if (kvm_s390_pv_cpu_get_handle(vcpu)) 3402 kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc); 3403 free_page((unsigned long)(vcpu->arch.sie_block)); 3404 kvm_s390_free_mmu_cache(vcpu->arch.mc); 3405 } 3406 3407 void kvm_arch_destroy_vm(struct kvm *kvm) 3408 { 3409 u16 rc, rrc; 3410 3411 kvm_destroy_vcpus(kvm); 3412 sca_dispose(kvm); 3413 kvm_s390_gisa_destroy(kvm); 3414 /* 3415 * We are already at the end of life and kvm->lock is not taken. 3416 * This is ok as the file descriptor is closed by now and nobody 3417 * can mess with the pv state. 3418 */ 3419 kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc); 3420 /* 3421 * Remove the mmu notifier only when the whole KVM VM is torn down, 3422 * and only if one was registered to begin with. If the VM is 3423 * currently not protected, but has been previously been protected, 3424 * then it's possible that the notifier is still registered. 3425 */ 3426 if (kvm->arch.pv.mmu_notifier.ops) 3427 mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm); 3428 3429 debug_unregister(kvm->arch.dbf); 3430 free_page((unsigned long)kvm->arch.sie_page2); 3431 kvm_s390_destroy_adapters(kvm); 3432 kvm_s390_clear_float_irqs(kvm); 3433 kvm_s390_vsie_destroy(kvm); 3434 kvm->arch.gmap = gmap_put(kvm->arch.gmap); 3435 KVM_EVENT(3, "vm 0x%p destroyed", kvm); 3436 } 3437 3438 /* Section: vcpu related */ 3439 static void sca_del_vcpu(struct kvm_vcpu *vcpu) 3440 { 3441 struct esca_block *sca = vcpu->kvm->arch.sca; 3442 3443 if (!kvm_s390_use_sca_entries() || !vcpu->arch.initialized) 3444 return; 3445 3446 clear_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn); 3447 sca->cpu[vcpu->vcpu_id].sda = 0; 3448 } 3449 3450 static void sca_add_vcpu(struct kvm_vcpu *vcpu) 3451 { 3452 struct esca_block *sca = vcpu->kvm->arch.sca; 3453 phys_addr_t sca_phys = virt_to_phys(sca); 3454 3455 /* we still need the sca header for the ipte control */ 3456 vcpu->arch.sie_block->scaoh = sca_phys >> 32; 3457 vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK; 3458 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 3459 3460 if (!kvm_s390_use_sca_entries()) 3461 return; 3462 3463 WRITE_ONCE(sca->cpu[vcpu->vcpu_id].sda, virt_to_phys(vcpu->arch.sie_block)); 3464 set_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn); 3465 } 3466 3467 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) 3468 { 3469 if (!kvm_s390_use_sca_entries()) 3470 return id < KVM_MAX_VCPUS; 3471 3472 return id < KVM_S390_ESCA_CPU_SLOTS; 3473 } 3474 3475 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3476 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3477 { 3478 WARN_ON_ONCE(vcpu->arch.cputm_start != 0); 3479 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3480 vcpu->arch.cputm_start = get_tod_clock_fast(); 3481 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3482 } 3483 3484 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3485 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3486 { 3487 WARN_ON_ONCE(vcpu->arch.cputm_start == 0); 3488 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3489 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; 3490 vcpu->arch.cputm_start = 0; 3491 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3492 } 3493 3494 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3495 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3496 { 3497 WARN_ON_ONCE(vcpu->arch.cputm_enabled); 3498 vcpu->arch.cputm_enabled = true; 3499 __start_cpu_timer_accounting(vcpu); 3500 } 3501 3502 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3503 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3504 { 3505 WARN_ON_ONCE(!vcpu->arch.cputm_enabled); 3506 __stop_cpu_timer_accounting(vcpu); 3507 vcpu->arch.cputm_enabled = false; 3508 } 3509 3510 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3511 { 3512 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3513 __enable_cpu_timer_accounting(vcpu); 3514 preempt_enable(); 3515 } 3516 3517 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3518 { 3519 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3520 __disable_cpu_timer_accounting(vcpu); 3521 preempt_enable(); 3522 } 3523 3524 /* set the cpu timer - may only be called from the VCPU thread itself */ 3525 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) 3526 { 3527 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3528 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3529 if (vcpu->arch.cputm_enabled) 3530 vcpu->arch.cputm_start = get_tod_clock_fast(); 3531 vcpu->arch.sie_block->cputm = cputm; 3532 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3533 preempt_enable(); 3534 } 3535 3536 /* update and get the cpu timer - can also be called from other VCPU threads */ 3537 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) 3538 { 3539 unsigned int seq; 3540 __u64 value; 3541 3542 if (unlikely(!vcpu->arch.cputm_enabled)) 3543 return vcpu->arch.sie_block->cputm; 3544 3545 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3546 do { 3547 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); 3548 /* 3549 * If the writer would ever execute a read in the critical 3550 * section, e.g. in irq context, we have a deadlock. 3551 */ 3552 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); 3553 value = vcpu->arch.sie_block->cputm; 3554 /* if cputm_start is 0, accounting is being started/stopped */ 3555 if (likely(vcpu->arch.cputm_start)) 3556 value -= get_tod_clock_fast() - vcpu->arch.cputm_start; 3557 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); 3558 preempt_enable(); 3559 return value; 3560 } 3561 3562 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 3563 { 3564 3565 kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING); 3566 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 3567 __start_cpu_timer_accounting(vcpu); 3568 vcpu->cpu = cpu; 3569 } 3570 3571 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 3572 { 3573 vcpu->cpu = -1; 3574 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 3575 __stop_cpu_timer_accounting(vcpu); 3576 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING); 3577 3578 } 3579 3580 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 3581 { 3582 mutex_lock(&vcpu->kvm->lock); 3583 preempt_disable(); 3584 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 3585 vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx; 3586 preempt_enable(); 3587 mutex_unlock(&vcpu->kvm->lock); 3588 if (!kvm_is_ucontrol(vcpu->kvm)) { 3589 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 3590 sca_add_vcpu(vcpu); 3591 } 3592 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0 || 3593 vcpu->kvm->arch.user_operexec) 3594 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 3595 3596 /* Pairs with smp_load_acquire() in kvm_arch_vcpu_ioctl_run() and kvm_arch_vcpu_ioctl() */ 3597 smp_store_release(&vcpu->arch.initialized, true); 3598 } 3599 3600 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr) 3601 { 3602 if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) && 3603 test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo)) 3604 return true; 3605 return false; 3606 } 3607 3608 static bool kvm_has_pckmo_ecc(struct kvm *kvm) 3609 { 3610 /* At least one ECC subfunction must be present */ 3611 return kvm_has_pckmo_subfunc(kvm, 32) || 3612 kvm_has_pckmo_subfunc(kvm, 33) || 3613 kvm_has_pckmo_subfunc(kvm, 34) || 3614 kvm_has_pckmo_subfunc(kvm, 40) || 3615 kvm_has_pckmo_subfunc(kvm, 41); 3616 3617 } 3618 3619 static bool kvm_has_pckmo_hmac(struct kvm *kvm) 3620 { 3621 /* At least one HMAC subfunction must be present */ 3622 return kvm_has_pckmo_subfunc(kvm, 118) || 3623 kvm_has_pckmo_subfunc(kvm, 122); 3624 } 3625 3626 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 3627 { 3628 /* 3629 * If the AP instructions are not being interpreted and the MSAX3 3630 * facility is not configured for the guest, there is nothing to set up. 3631 */ 3632 if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76)) 3633 return; 3634 3635 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 3636 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 3637 vcpu->arch.sie_block->eca &= ~ECA_APIE; 3638 vcpu->arch.sie_block->ecd &= ~(ECD_ECC | ECD_HMAC); 3639 3640 if (vcpu->kvm->arch.crypto.apie) 3641 vcpu->arch.sie_block->eca |= ECA_APIE; 3642 3643 /* Set up protected key support */ 3644 if (vcpu->kvm->arch.crypto.aes_kw) { 3645 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 3646 /* ecc/hmac is also wrapped with AES key */ 3647 if (kvm_has_pckmo_ecc(vcpu->kvm)) 3648 vcpu->arch.sie_block->ecd |= ECD_ECC; 3649 if (kvm_has_pckmo_hmac(vcpu->kvm)) 3650 vcpu->arch.sie_block->ecd |= ECD_HMAC; 3651 } 3652 3653 if (vcpu->kvm->arch.crypto.dea_kw) 3654 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 3655 } 3656 3657 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 3658 { 3659 if (vcpu->arch.sie_block->cbrlo) 3660 free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo)); 3661 vcpu->arch.sie_block->cbrlo = 0; 3662 } 3663 3664 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 3665 { 3666 void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); 3667 3668 if (!cbrlo_page) 3669 return -ENOMEM; 3670 3671 vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page); 3672 return 0; 3673 } 3674 3675 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 3676 { 3677 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 3678 3679 vcpu->arch.sie_block->ibc = model->ibc; 3680 if (test_kvm_facility(vcpu->kvm, 7)) 3681 vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list); 3682 } 3683 3684 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu) 3685 { 3686 int rc = 0; 3687 u16 uvrc, uvrrc; 3688 3689 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 3690 CPUSTAT_SM | 3691 CPUSTAT_STOPPED); 3692 3693 if (test_kvm_facility(vcpu->kvm, 78)) 3694 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2); 3695 else if (test_kvm_facility(vcpu->kvm, 8)) 3696 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED); 3697 3698 kvm_s390_vcpu_setup_model(vcpu); 3699 3700 /* pgste_set_pte has special handling for !machine_has_esop() */ 3701 if (machine_has_esop()) 3702 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT; 3703 if (test_kvm_facility(vcpu->kvm, 9)) 3704 vcpu->arch.sie_block->ecb |= ECB_SRSI; 3705 if (test_kvm_facility(vcpu->kvm, 11)) 3706 vcpu->arch.sie_block->ecb |= ECB_PTF; 3707 if (test_kvm_facility(vcpu->kvm, 73)) 3708 vcpu->arch.sie_block->ecb |= ECB_TE; 3709 if (!kvm_is_ucontrol(vcpu->kvm)) 3710 vcpu->arch.sie_block->ecb |= ECB_SPECI; 3711 3712 if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi) 3713 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI; 3714 if (test_kvm_facility(vcpu->kvm, 130)) 3715 vcpu->arch.sie_block->ecb2 |= ECB2_IEP; 3716 vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI; 3717 if (sclp.has_cei) 3718 vcpu->arch.sie_block->eca |= ECA_CEI; 3719 if (sclp.has_ib) 3720 vcpu->arch.sie_block->eca |= ECA_IB; 3721 if (sclp.has_siif) 3722 vcpu->arch.sie_block->eca |= ECA_SII; 3723 if (kvm_s390_use_sca_entries()) 3724 vcpu->arch.sie_block->eca |= ECA_SIGPI; 3725 if (test_kvm_facility(vcpu->kvm, 129)) { 3726 vcpu->arch.sie_block->eca |= ECA_VX; 3727 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 3728 } 3729 if (test_kvm_facility(vcpu->kvm, 139)) 3730 vcpu->arch.sie_block->ecd |= ECD_MEF; 3731 if (test_kvm_facility(vcpu->kvm, 156)) 3732 vcpu->arch.sie_block->ecd |= ECD_ETOKENF; 3733 if (vcpu->arch.sie_block->gd) { 3734 vcpu->arch.sie_block->eca |= ECA_AIV; 3735 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", 3736 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); 3737 } 3738 vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC; 3739 vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb); 3740 3741 if (sclp.has_kss) 3742 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); 3743 else 3744 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 3745 3746 if (vcpu->kvm->arch.use_cmma) { 3747 rc = kvm_s390_vcpu_setup_cmma(vcpu); 3748 if (rc) 3749 return rc; 3750 } 3751 hrtimer_setup(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup, CLOCK_MONOTONIC, 3752 HRTIMER_MODE_REL); 3753 3754 vcpu->arch.sie_block->hpid = HPID_KVM; 3755 3756 kvm_s390_vcpu_crypto_setup(vcpu); 3757 3758 kvm_s390_vcpu_pci_setup(vcpu); 3759 3760 mutex_lock(&vcpu->kvm->lock); 3761 if (kvm_s390_pv_is_protected(vcpu->kvm)) { 3762 rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc); 3763 if (rc) 3764 kvm_s390_vcpu_unsetup_cmma(vcpu); 3765 } 3766 mutex_unlock(&vcpu->kvm->lock); 3767 3768 return rc; 3769 } 3770 3771 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) 3772 { 3773 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) 3774 return -EINVAL; 3775 return 0; 3776 } 3777 3778 DEFINE_FREE(sie_page, struct sie_page *, if (_T) free_page((unsigned long)(_T))) 3779 3780 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) 3781 { 3782 struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL; 3783 struct sie_page *sie_page __free(sie_page) = NULL; 3784 int rc; 3785 3786 BUILD_BUG_ON(sizeof(struct sie_page) != 4096); 3787 mc = kvm_s390_new_mmu_cache(); 3788 if (!mc) 3789 return -ENOMEM; 3790 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT); 3791 if (!sie_page) 3792 return -ENOMEM; 3793 3794 vcpu->arch.sie_block = &sie_page->sie_block; 3795 vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb); 3796 3797 /* the real guest size will always be smaller than msl */ 3798 vcpu->arch.sie_block->mso = 0; 3799 vcpu->arch.sie_block->msl = sclp.hamax; 3800 3801 vcpu->arch.sie_block->icpua = vcpu->vcpu_id; 3802 spin_lock_init(&vcpu->arch.local_int.lock); 3803 vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm); 3804 seqcount_init(&vcpu->arch.cputm_seqcount); 3805 3806 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 3807 kvm_clear_async_pf_completion_queue(vcpu); 3808 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 3809 KVM_SYNC_GPRS | 3810 KVM_SYNC_ACRS | 3811 KVM_SYNC_CRS | 3812 KVM_SYNC_ARCH0 | 3813 KVM_SYNC_PFAULT | 3814 KVM_SYNC_DIAG318; 3815 vcpu->arch.acrs_loaded = false; 3816 kvm_s390_set_prefix(vcpu, 0); 3817 if (test_kvm_facility(vcpu->kvm, 64)) 3818 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; 3819 if (test_kvm_facility(vcpu->kvm, 82)) 3820 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC; 3821 if (test_kvm_facility(vcpu->kvm, 133)) 3822 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB; 3823 if (test_kvm_facility(vcpu->kvm, 156)) 3824 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN; 3825 /* fprs can be synchronized via vrs, even if the guest has no vx. With 3826 * cpu_has_vx(), (load|store)_fpu_regs() will work with vrs format. 3827 */ 3828 if (cpu_has_vx()) 3829 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 3830 else 3831 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; 3832 3833 if (kvm_is_ucontrol(vcpu->kvm)) { 3834 vcpu->arch.gmap = gmap_new_child(vcpu->kvm->arch.gmap, -1UL); 3835 if (!vcpu->arch.gmap) 3836 return -ENOMEM; 3837 } 3838 3839 VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%p, sie block at 0x%p", 3840 vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); 3841 trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); 3842 3843 rc = kvm_s390_vcpu_setup(vcpu); 3844 if (rc) { 3845 if (kvm_is_ucontrol(vcpu->kvm)) { 3846 scoped_guard(spinlock, &vcpu->kvm->arch.gmap->children_lock) 3847 gmap_remove_child(vcpu->arch.gmap); 3848 vcpu->arch.gmap = gmap_put(vcpu->arch.gmap); 3849 } 3850 return rc; 3851 } 3852 3853 vcpu->arch.mc = no_free_ptr(mc); 3854 sie_page = NULL; 3855 kvm_s390_update_topology_change_report(vcpu->kvm, 1); 3856 return 0; 3857 } 3858 3859 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 3860 { 3861 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); 3862 return kvm_s390_vcpu_has_irq(vcpu, 0); 3863 } 3864 3865 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 3866 { 3867 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE); 3868 } 3869 3870 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 3871 { 3872 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3873 exit_sie(vcpu); 3874 } 3875 3876 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 3877 { 3878 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3879 } 3880 3881 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 3882 { 3883 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3884 exit_sie(vcpu); 3885 } 3886 3887 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu) 3888 { 3889 return atomic_read(&vcpu->arch.sie_block->prog20) & 3890 (PROG_BLOCK_SIE | PROG_REQUEST); 3891 } 3892 3893 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 3894 { 3895 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3896 } 3897 3898 /* 3899 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running. 3900 * If the CPU is not running (e.g. waiting as idle) the function will 3901 * return immediately. */ 3902 void exit_sie(struct kvm_vcpu *vcpu) 3903 { 3904 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT); 3905 kvm_s390_vsie_kick(vcpu); 3906 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 3907 cpu_relax(); 3908 } 3909 3910 /* Kick a guest cpu out of SIE to process a request synchronously */ 3911 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 3912 { 3913 __kvm_make_request(req, vcpu); 3914 kvm_s390_vcpu_request(vcpu); 3915 } 3916 3917 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) 3918 { 3919 /* do not poll with more than halt_poll_max_steal percent of steal time */ 3920 if (get_lowcore()->avg_steal_timer * 100 / (TICK_USEC << 12) >= 3921 READ_ONCE(halt_poll_max_steal)) { 3922 vcpu->stat.halt_no_poll_steal++; 3923 return true; 3924 } 3925 return false; 3926 } 3927 3928 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 3929 { 3930 /* kvm common code refers to this, but never calls it */ 3931 BUG(); 3932 return 0; 3933 } 3934 3935 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 3936 struct kvm_one_reg *reg) 3937 { 3938 int r = -EINVAL; 3939 3940 switch (reg->id) { 3941 case KVM_REG_S390_TODPR: 3942 r = put_user(vcpu->arch.sie_block->todpr, 3943 (u32 __user *)reg->addr); 3944 break; 3945 case KVM_REG_S390_EPOCHDIFF: 3946 r = put_user(vcpu->arch.sie_block->epoch, 3947 (u64 __user *)reg->addr); 3948 break; 3949 case KVM_REG_S390_CPU_TIMER: 3950 r = put_user(kvm_s390_get_cpu_timer(vcpu), 3951 (u64 __user *)reg->addr); 3952 break; 3953 case KVM_REG_S390_CLOCK_COMP: 3954 r = put_user(vcpu->arch.sie_block->ckc, 3955 (u64 __user *)reg->addr); 3956 break; 3957 case KVM_REG_S390_PFTOKEN: 3958 r = put_user(vcpu->arch.pfault_token, 3959 (u64 __user *)reg->addr); 3960 break; 3961 case KVM_REG_S390_PFCOMPARE: 3962 r = put_user(vcpu->arch.pfault_compare, 3963 (u64 __user *)reg->addr); 3964 break; 3965 case KVM_REG_S390_PFSELECT: 3966 r = put_user(vcpu->arch.pfault_select, 3967 (u64 __user *)reg->addr); 3968 break; 3969 case KVM_REG_S390_PP: 3970 r = put_user(vcpu->arch.sie_block->pp, 3971 (u64 __user *)reg->addr); 3972 break; 3973 case KVM_REG_S390_GBEA: 3974 r = put_user(vcpu->arch.sie_block->gbea, 3975 (u64 __user *)reg->addr); 3976 break; 3977 default: 3978 break; 3979 } 3980 3981 return r; 3982 } 3983 3984 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 3985 struct kvm_one_reg *reg) 3986 { 3987 int r = -EINVAL; 3988 __u64 val; 3989 3990 switch (reg->id) { 3991 case KVM_REG_S390_TODPR: 3992 r = get_user(vcpu->arch.sie_block->todpr, 3993 (u32 __user *)reg->addr); 3994 break; 3995 case KVM_REG_S390_EPOCHDIFF: 3996 r = get_user(vcpu->arch.sie_block->epoch, 3997 (u64 __user *)reg->addr); 3998 break; 3999 case KVM_REG_S390_CPU_TIMER: 4000 r = get_user(val, (u64 __user *)reg->addr); 4001 if (!r) 4002 kvm_s390_set_cpu_timer(vcpu, val); 4003 break; 4004 case KVM_REG_S390_CLOCK_COMP: 4005 r = get_user(vcpu->arch.sie_block->ckc, 4006 (u64 __user *)reg->addr); 4007 break; 4008 case KVM_REG_S390_PFTOKEN: 4009 r = get_user(vcpu->arch.pfault_token, 4010 (u64 __user *)reg->addr); 4011 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4012 kvm_clear_async_pf_completion_queue(vcpu); 4013 break; 4014 case KVM_REG_S390_PFCOMPARE: 4015 r = get_user(vcpu->arch.pfault_compare, 4016 (u64 __user *)reg->addr); 4017 break; 4018 case KVM_REG_S390_PFSELECT: 4019 r = get_user(vcpu->arch.pfault_select, 4020 (u64 __user *)reg->addr); 4021 break; 4022 case KVM_REG_S390_PP: 4023 r = get_user(vcpu->arch.sie_block->pp, 4024 (u64 __user *)reg->addr); 4025 break; 4026 case KVM_REG_S390_GBEA: 4027 r = get_user(vcpu->arch.sie_block->gbea, 4028 (u64 __user *)reg->addr); 4029 break; 4030 default: 4031 break; 4032 } 4033 4034 return r; 4035 } 4036 4037 static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu) 4038 { 4039 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI; 4040 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 4041 memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb)); 4042 4043 kvm_clear_async_pf_completion_queue(vcpu); 4044 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 4045 kvm_s390_vcpu_stop(vcpu); 4046 kvm_s390_clear_local_irqs(vcpu); 4047 } 4048 4049 static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 4050 { 4051 /* Initial reset is a superset of the normal reset */ 4052 kvm_arch_vcpu_ioctl_normal_reset(vcpu); 4053 4054 /* 4055 * This equals initial cpu reset in pop, but we don't switch to ESA. 4056 * We do not only reset the internal data, but also ... 4057 */ 4058 vcpu->arch.sie_block->gpsw.mask = 0; 4059 vcpu->arch.sie_block->gpsw.addr = 0; 4060 kvm_s390_set_prefix(vcpu, 0); 4061 kvm_s390_set_cpu_timer(vcpu, 0); 4062 vcpu->arch.sie_block->ckc = 0; 4063 memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); 4064 vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; 4065 vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; 4066 4067 /* ... the data in sync regs */ 4068 memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs)); 4069 vcpu->run->s.regs.ckc = 0; 4070 vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK; 4071 vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK; 4072 vcpu->run->psw_addr = 0; 4073 vcpu->run->psw_mask = 0; 4074 vcpu->run->s.regs.todpr = 0; 4075 vcpu->run->s.regs.cputm = 0; 4076 vcpu->run->s.regs.ckc = 0; 4077 vcpu->run->s.regs.pp = 0; 4078 vcpu->run->s.regs.gbea = 1; 4079 vcpu->run->s.regs.fpc = 0; 4080 /* 4081 * Do not reset these registers in the protected case, as some of 4082 * them are overlaid and they are not accessible in this case 4083 * anyway. 4084 */ 4085 if (!kvm_s390_pv_cpu_is_protected(vcpu)) { 4086 vcpu->arch.sie_block->gbea = 1; 4087 vcpu->arch.sie_block->pp = 0; 4088 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 4089 vcpu->arch.sie_block->todpr = 0; 4090 } 4091 } 4092 4093 static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) 4094 { 4095 struct kvm_sync_regs *regs = &vcpu->run->s.regs; 4096 4097 /* Clear reset is a superset of the initial reset */ 4098 kvm_arch_vcpu_ioctl_initial_reset(vcpu); 4099 4100 memset(®s->gprs, 0, sizeof(regs->gprs)); 4101 memset(®s->vrs, 0, sizeof(regs->vrs)); 4102 memset(®s->acrs, 0, sizeof(regs->acrs)); 4103 memset(®s->gscb, 0, sizeof(regs->gscb)); 4104 4105 regs->etoken = 0; 4106 regs->etoken_extension = 0; 4107 } 4108 4109 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 4110 { 4111 vcpu_load(vcpu); 4112 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 4113 vcpu_put(vcpu); 4114 return 0; 4115 } 4116 4117 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 4118 { 4119 vcpu_load(vcpu); 4120 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 4121 vcpu_put(vcpu); 4122 return 0; 4123 } 4124 4125 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 4126 struct kvm_sregs *sregs) 4127 { 4128 vcpu_load(vcpu); 4129 4130 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 4131 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 4132 4133 vcpu_put(vcpu); 4134 return 0; 4135 } 4136 4137 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 4138 struct kvm_sregs *sregs) 4139 { 4140 vcpu_load(vcpu); 4141 4142 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 4143 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 4144 4145 vcpu_put(vcpu); 4146 return 0; 4147 } 4148 4149 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 4150 { 4151 vcpu_load(vcpu); 4152 4153 vcpu->run->s.regs.fpc = fpu->fpc; 4154 if (cpu_has_vx()) 4155 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs, 4156 (freg_t *) fpu->fprs); 4157 else 4158 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs)); 4159 4160 vcpu_put(vcpu); 4161 return 0; 4162 } 4163 4164 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 4165 { 4166 vcpu_load(vcpu); 4167 4168 if (cpu_has_vx()) 4169 convert_vx_to_fp((freg_t *) fpu->fprs, 4170 (__vector128 *) vcpu->run->s.regs.vrs); 4171 else 4172 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs)); 4173 fpu->fpc = vcpu->run->s.regs.fpc; 4174 4175 vcpu_put(vcpu); 4176 return 0; 4177 } 4178 4179 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 4180 { 4181 int rc = 0; 4182 4183 if (!is_vcpu_stopped(vcpu)) 4184 rc = -EBUSY; 4185 else { 4186 vcpu->run->psw_mask = psw.mask; 4187 vcpu->run->psw_addr = psw.addr; 4188 } 4189 return rc; 4190 } 4191 4192 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 4193 struct kvm_translation *tr) 4194 { 4195 return -EINVAL; /* not implemented yet */ 4196 } 4197 4198 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 4199 KVM_GUESTDBG_USE_HW_BP | \ 4200 KVM_GUESTDBG_ENABLE) 4201 4202 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 4203 struct kvm_guest_debug *dbg) 4204 { 4205 int rc = 0; 4206 4207 vcpu_load(vcpu); 4208 4209 vcpu->guest_debug = 0; 4210 kvm_s390_clear_bp_data(vcpu); 4211 4212 if (dbg->control & ~VALID_GUESTDBG_FLAGS) { 4213 rc = -EINVAL; 4214 goto out; 4215 } 4216 if (!sclp.has_gpere) { 4217 rc = -EINVAL; 4218 goto out; 4219 } 4220 4221 if (dbg->control & KVM_GUESTDBG_ENABLE) { 4222 vcpu->guest_debug = dbg->control; 4223 /* enforce guest PER */ 4224 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P); 4225 4226 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) { 4227 scoped_guard(srcu, &vcpu->kvm->srcu) 4228 rc = kvm_s390_import_bp_data(vcpu, dbg); 4229 } 4230 } else { 4231 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 4232 vcpu->arch.guestdbg.last_bp = 0; 4233 } 4234 4235 if (rc) { 4236 vcpu->guest_debug = 0; 4237 kvm_s390_clear_bp_data(vcpu); 4238 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 4239 } 4240 4241 out: 4242 vcpu_put(vcpu); 4243 return rc; 4244 } 4245 4246 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 4247 struct kvm_mp_state *mp_state) 4248 { 4249 int ret; 4250 4251 vcpu_load(vcpu); 4252 4253 /* CHECK_STOP and LOAD are not supported yet */ 4254 ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 4255 KVM_MP_STATE_OPERATING; 4256 4257 vcpu_put(vcpu); 4258 return ret; 4259 } 4260 4261 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 4262 struct kvm_mp_state *mp_state) 4263 { 4264 int rc = 0; 4265 4266 vcpu_load(vcpu); 4267 4268 /* user space knows about this interface - let it control the state */ 4269 kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm); 4270 4271 switch (mp_state->mp_state) { 4272 case KVM_MP_STATE_STOPPED: 4273 rc = kvm_s390_vcpu_stop(vcpu); 4274 break; 4275 case KVM_MP_STATE_OPERATING: 4276 rc = kvm_s390_vcpu_start(vcpu); 4277 break; 4278 case KVM_MP_STATE_LOAD: 4279 if (!kvm_s390_pv_cpu_is_protected(vcpu)) { 4280 rc = -ENXIO; 4281 break; 4282 } 4283 rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD); 4284 break; 4285 case KVM_MP_STATE_CHECK_STOP: 4286 fallthrough; /* CHECK_STOP and LOAD are not supported yet */ 4287 default: 4288 rc = -ENXIO; 4289 } 4290 4291 vcpu_put(vcpu); 4292 return rc; 4293 } 4294 4295 static bool ibs_enabled(struct kvm_vcpu *vcpu) 4296 { 4297 return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS); 4298 } 4299 4300 static int vcpu_ucontrol_translate(struct kvm_vcpu *vcpu, gpa_t *gaddr) 4301 { 4302 int rc; 4303 4304 if (kvm_is_ucontrol(vcpu->kvm)) { 4305 rc = gmap_ucas_translate(vcpu->arch.mc, vcpu->arch.gmap, gaddr); 4306 if (rc == -EREMOTE) { 4307 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 4308 vcpu->run->s390_ucontrol.trans_exc_code = *gaddr; 4309 vcpu->run->s390_ucontrol.pgm_code = PGM_SEGMENT_TRANSLATION; 4310 } 4311 return rc; 4312 } 4313 return 0; 4314 } 4315 4316 static int kvm_s390_fixup_prefix(struct kvm_vcpu *vcpu) 4317 { 4318 gpa_t gaddr = kvm_s390_get_prefix(vcpu); 4319 gfn_t gfn; 4320 int rc; 4321 4322 if (vcpu_ucontrol_translate(vcpu, &gaddr)) 4323 return -EREMOTE; 4324 gfn = gpa_to_gfn(gaddr); 4325 4326 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn, true); 4327 if (rc) 4328 return rc; 4329 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn + 1, true); 4330 if (rc) 4331 return rc; 4332 4333 scoped_guard(write_lock, &vcpu->kvm->mmu_lock) 4334 rc = dat_set_prefix_notif_bit(vcpu->kvm->arch.gmap->asce, gfn); 4335 return rc; 4336 } 4337 4338 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 4339 { 4340 retry: 4341 kvm_s390_vcpu_request_handled(vcpu); 4342 if (!kvm_request_pending(vcpu)) 4343 return 0; 4344 /* 4345 * If the guest prefix changed, re-arm the ipte notifier for the 4346 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. 4347 * This ensures that the ipte instruction for this request has 4348 * already finished. We might race against a second unmapper that 4349 * wants to set the blocking bit. Lets just retry the request loop. 4350 */ 4351 if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) { 4352 int rc; 4353 4354 rc = kvm_s390_fixup_prefix(vcpu); 4355 if (rc) { 4356 kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); 4357 return rc; 4358 } 4359 goto retry; 4360 } 4361 4362 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 4363 vcpu->arch.sie_block->ihcpu = 0xffff; 4364 goto retry; 4365 } 4366 4367 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 4368 if (!ibs_enabled(vcpu)) { 4369 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 4370 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS); 4371 } 4372 goto retry; 4373 } 4374 4375 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 4376 if (ibs_enabled(vcpu)) { 4377 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 4378 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS); 4379 } 4380 goto retry; 4381 } 4382 4383 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { 4384 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 4385 goto retry; 4386 } 4387 4388 if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) { 4389 /* 4390 * Disable CMM virtualization; we will emulate the ESSA 4391 * instruction manually, in order to provide additional 4392 * functionalities needed for live migration. 4393 */ 4394 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA; 4395 goto retry; 4396 } 4397 4398 if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) { 4399 /* 4400 * Re-enable CMM virtualization if CMMA is available and 4401 * CMM has been used. 4402 */ 4403 if (vcpu->kvm->arch.use_cmma && uses_cmm(vcpu->arch.gmap)) 4404 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 4405 goto retry; 4406 } 4407 4408 /* we left the vsie handler, nothing to do, just clear the request */ 4409 kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); 4410 4411 return 0; 4412 } 4413 4414 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) 4415 { 4416 struct kvm_vcpu *vcpu; 4417 union tod_clock clk; 4418 unsigned long i; 4419 4420 preempt_disable(); 4421 4422 store_tod_clock_ext(&clk); 4423 4424 kvm->arch.epoch = gtod->tod - clk.tod; 4425 kvm->arch.epdx = 0; 4426 if (test_kvm_facility(kvm, 139)) { 4427 kvm->arch.epdx = gtod->epoch_idx - clk.ei; 4428 if (kvm->arch.epoch > gtod->tod) 4429 kvm->arch.epdx -= 1; 4430 } 4431 4432 kvm_s390_vcpu_block_all(kvm); 4433 kvm_for_each_vcpu(i, vcpu, kvm) { 4434 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 4435 vcpu->arch.sie_block->epdx = kvm->arch.epdx; 4436 } 4437 4438 kvm_s390_vcpu_unblock_all(kvm); 4439 preempt_enable(); 4440 } 4441 4442 int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) 4443 { 4444 if (!mutex_trylock(&kvm->lock)) 4445 return 0; 4446 __kvm_s390_set_tod_clock(kvm, gtod); 4447 mutex_unlock(&kvm->lock); 4448 return 1; 4449 } 4450 4451 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 4452 unsigned long token) 4453 { 4454 struct kvm_s390_interrupt inti = {}; 4455 struct kvm_s390_irq irq = {}; 4456 struct kvm_s390_interrupt_info *inti_mem = NULL; 4457 int ret = 0; 4458 4459 if (start_token) { 4460 irq.u.ext.ext_params2 = token; 4461 irq.type = KVM_S390_INT_PFAULT_INIT; 4462 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 4463 } else { 4464 inti_mem = kzalloc_obj(*inti_mem, GFP_KERNEL_ACCOUNT); 4465 if (WARN_ON_ONCE(!inti_mem)) 4466 return; 4467 4468 inti.type = KVM_S390_INT_PFAULT_DONE; 4469 inti.parm64 = token; 4470 ret = kvm_s390_inject_vm(vcpu->kvm, &inti, inti_mem); 4471 if (ret) 4472 kfree(inti_mem); 4473 WARN_ON_ONCE(ret); 4474 } 4475 } 4476 4477 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 4478 struct kvm_async_pf *work) 4479 { 4480 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 4481 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 4482 4483 return true; 4484 } 4485 4486 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 4487 struct kvm_async_pf *work) 4488 { 4489 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 4490 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 4491 } 4492 4493 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 4494 struct kvm_async_pf *work) 4495 { 4496 /* s390 will always inject the page directly */ 4497 } 4498 4499 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu) 4500 { 4501 /* 4502 * s390 will always inject the page directly, 4503 * but we still want check_async_completion to cleanup 4504 */ 4505 return true; 4506 } 4507 4508 bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 4509 { 4510 hva_t hva; 4511 struct kvm_arch_async_pf arch; 4512 4513 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4514 return false; 4515 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 4516 vcpu->arch.pfault_compare) 4517 return false; 4518 if (psw_extint_disabled(vcpu)) 4519 return false; 4520 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 4521 return false; 4522 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) 4523 return false; 4524 if (!pfault_enabled(vcpu->arch.gmap)) 4525 return false; 4526 4527 hva = gfn_to_hva(vcpu->kvm, current->thread.gmap_teid.addr); 4528 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 4529 return false; 4530 4531 return kvm_setup_async_pf(vcpu, current->thread.gmap_teid.addr * PAGE_SIZE, hva, &arch); 4532 } 4533 4534 static int vcpu_pre_run(struct kvm_vcpu *vcpu) 4535 { 4536 int rc, cpuflags; 4537 4538 /* 4539 * On s390 notifications for arriving pages will be delivered directly 4540 * to the guest but the house keeping for completed pfaults is 4541 * handled outside the worker. 4542 */ 4543 kvm_check_async_pf_completion(vcpu); 4544 4545 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; 4546 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; 4547 4548 if (!kvm_is_ucontrol(vcpu->kvm)) { 4549 rc = kvm_s390_deliver_pending_interrupts(vcpu); 4550 if (rc || guestdbg_exit_pending(vcpu)) 4551 return rc; 4552 } 4553 4554 rc = kvm_s390_handle_requests(vcpu); 4555 if (rc) 4556 return rc; 4557 4558 if (guestdbg_enabled(vcpu)) { 4559 kvm_s390_backup_guest_per_regs(vcpu); 4560 kvm_s390_patch_guest_per_regs(vcpu); 4561 } 4562 4563 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); 4564 4565 vcpu->arch.sie_block->icptcode = 0; 4566 current->thread.gmap_int_code = 0; 4567 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 4568 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 4569 trace_kvm_s390_sie_enter(vcpu, cpuflags); 4570 4571 return 0; 4572 } 4573 4574 static int vcpu_post_run_addressing_exception(struct kvm_vcpu *vcpu) 4575 { 4576 struct kvm_s390_pgm_info pgm_info = { 4577 .code = PGM_ADDRESSING, 4578 }; 4579 u8 opcode, ilen; 4580 int rc; 4581 4582 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 4583 trace_kvm_s390_sie_fault(vcpu); 4584 4585 /* 4586 * We want to inject an addressing exception, which is defined as a 4587 * suppressing or terminating exception. However, since we came here 4588 * by a DAT access exception, the PSW still points to the faulting 4589 * instruction since DAT exceptions are nullifying. So we've got 4590 * to look up the current opcode to get the length of the instruction 4591 * to be able to forward the PSW. 4592 */ 4593 rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1); 4594 ilen = insn_length(opcode); 4595 if (rc < 0) { 4596 return rc; 4597 } else if (rc) { 4598 /* Instruction-Fetching Exceptions - we can't detect the ilen. 4599 * Forward by arbitrary ilc, injection will take care of 4600 * nullification if necessary. 4601 */ 4602 pgm_info = vcpu->arch.pgm; 4603 ilen = 4; 4604 } 4605 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; 4606 kvm_s390_forward_psw(vcpu, ilen); 4607 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 4608 } 4609 4610 static void kvm_s390_assert_primary_as(struct kvm_vcpu *vcpu) 4611 { 4612 KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm, 4613 "Unexpected program interrupt 0x%x, TEID 0x%016lx", 4614 current->thread.gmap_int_code, current->thread.gmap_teid.val); 4615 } 4616 4617 static int vcpu_dat_fault_handler(struct kvm_vcpu *vcpu, gpa_t gaddr, bool wr) 4618 { 4619 struct guest_fault f = { 4620 .write_attempt = wr, 4621 .attempt_pfault = pfault_enabled(vcpu->arch.gmap), 4622 }; 4623 int rc; 4624 4625 if (vcpu_ucontrol_translate(vcpu, &gaddr)) 4626 return -EREMOTE; 4627 f.gfn = gpa_to_gfn(gaddr); 4628 4629 rc = kvm_s390_faultin_gfn(vcpu, NULL, &f); 4630 if (rc <= 0) 4631 return rc; 4632 if (rc == PGM_ADDRESSING) 4633 return vcpu_post_run_addressing_exception(vcpu); 4634 KVM_BUG_ON(rc, vcpu->kvm); 4635 return -EINVAL; 4636 } 4637 4638 static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu) 4639 { 4640 unsigned int foll = 0; 4641 unsigned long gaddr; 4642 int rc; 4643 4644 gaddr = current->thread.gmap_teid.addr * PAGE_SIZE; 4645 if (kvm_s390_cur_gmap_fault_is_write()) 4646 foll = FOLL_WRITE; 4647 4648 switch (current->thread.gmap_int_code & PGM_INT_CODE_MASK) { 4649 case 0: 4650 vcpu->stat.exit_null++; 4651 break; 4652 case PGM_SECURE_STORAGE_ACCESS: 4653 case PGM_SECURE_STORAGE_VIOLATION: 4654 kvm_s390_assert_primary_as(vcpu); 4655 /* 4656 * This can happen after a reboot with asynchronous teardown; 4657 * the new guest (normal or protected) will run on top of the 4658 * previous protected guest. The old pages need to be destroyed 4659 * so the new guest can use them. 4660 */ 4661 if (kvm_s390_pv_destroy_page(vcpu->kvm, gaddr)) { 4662 /* 4663 * Either KVM messed up the secure guest mapping or the 4664 * same page is mapped into multiple secure guests. 4665 * 4666 * This exception is only triggered when a guest 2 is 4667 * running and can therefore never occur in kernel 4668 * context. 4669 */ 4670 pr_warn_ratelimited("Secure storage violation (%x) in task: %s, pid %d\n", 4671 current->thread.gmap_int_code, current->comm, 4672 current->pid); 4673 send_sig(SIGSEGV, current, 0); 4674 } 4675 break; 4676 case PGM_NON_SECURE_STORAGE_ACCESS: 4677 kvm_s390_assert_primary_as(vcpu); 4678 /* 4679 * This is normal operation; a page belonging to a protected 4680 * guest has not been imported yet. Try to import the page into 4681 * the protected guest. 4682 */ 4683 rc = kvm_s390_pv_convert_to_secure(vcpu->kvm, gaddr); 4684 if (rc == -EINVAL) 4685 send_sig(SIGSEGV, current, 0); 4686 if (rc != -ENXIO) 4687 break; 4688 foll = FOLL_WRITE; 4689 fallthrough; 4690 case PGM_PROTECTION: 4691 case PGM_SEGMENT_TRANSLATION: 4692 case PGM_PAGE_TRANSLATION: 4693 case PGM_ASCE_TYPE: 4694 case PGM_REGION_FIRST_TRANS: 4695 case PGM_REGION_SECOND_TRANS: 4696 case PGM_REGION_THIRD_TRANS: 4697 kvm_s390_assert_primary_as(vcpu); 4698 return vcpu_dat_fault_handler(vcpu, gaddr, foll); 4699 default: 4700 KVM_BUG(1, vcpu->kvm, "Unexpected program interrupt 0x%x, TEID 0x%016lx", 4701 current->thread.gmap_int_code, current->thread.gmap_teid.val); 4702 send_sig(SIGSEGV, current, 0); 4703 break; 4704 } 4705 return 0; 4706 } 4707 4708 static int vcpu_post_run(struct kvm_vcpu *vcpu, int sie_return) 4709 { 4710 struct mcck_volatile_info *mcck_info; 4711 struct sie_page *sie_page; 4712 int rc; 4713 4714 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 4715 vcpu->arch.sie_block->icptcode); 4716 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 4717 4718 if (guestdbg_enabled(vcpu)) 4719 kvm_s390_restore_guest_per_regs(vcpu); 4720 4721 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; 4722 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; 4723 4724 if (sie_return == SIE64_RETURN_MCCK) { 4725 sie_page = container_of(vcpu->arch.sie_block, 4726 struct sie_page, sie_block); 4727 mcck_info = &sie_page->mcck_info; 4728 kvm_s390_reinject_machine_check(vcpu, mcck_info); 4729 return 0; 4730 } 4731 WARN_ON_ONCE(sie_return != SIE64_RETURN_NORMAL); 4732 4733 if (vcpu->arch.sie_block->icptcode > 0) { 4734 rc = kvm_handle_sie_intercept(vcpu); 4735 4736 if (rc != -EOPNOTSUPP) 4737 return rc; 4738 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; 4739 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 4740 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 4741 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 4742 return -EREMOTE; 4743 } 4744 4745 return vcpu_post_run_handle_fault(vcpu); 4746 } 4747 4748 int noinstr kvm_s390_enter_exit_sie(struct kvm_s390_sie_block *scb, 4749 u64 *gprs, unsigned long gasce) 4750 { 4751 int ret; 4752 4753 guest_state_enter_irqoff(); 4754 4755 /* 4756 * The guest_state_{enter,exit}_irqoff() functions inform lockdep and 4757 * tracing that entry to the guest will enable host IRQs, and exit from 4758 * the guest will disable host IRQs. 4759 */ 4760 ret = sie64a(scb, gprs, gasce); 4761 4762 guest_state_exit_irqoff(); 4763 4764 return ret; 4765 } 4766 4767 #define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK) 4768 static int __vcpu_run(struct kvm_vcpu *vcpu) 4769 { 4770 int rc, sie_return; 4771 struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block; 4772 4773 /* 4774 * We try to hold kvm->srcu during most of vcpu_run (except when run- 4775 * ning the guest), so that memslots (and other stuff) are protected 4776 */ 4777 kvm_vcpu_srcu_read_lock(vcpu); 4778 4779 while (true) { 4780 rc = vcpu_pre_run(vcpu); 4781 kvm_vcpu_srcu_read_unlock(vcpu); 4782 if (rc || guestdbg_exit_pending(vcpu)) 4783 break; 4784 4785 /* 4786 * As PF_VCPU will be used in fault handler, between 4787 * guest_timing_enter_irqoff and guest_timing_exit_irqoff 4788 * should be no uaccess. 4789 */ 4790 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 4791 memcpy(sie_page->pv_grregs, 4792 vcpu->run->s.regs.gprs, 4793 sizeof(sie_page->pv_grregs)); 4794 } 4795 4796 xfer_to_guest_mode_check: 4797 local_irq_disable(); 4798 xfer_to_guest_mode_prepare(); 4799 if (xfer_to_guest_mode_work_pending()) { 4800 local_irq_enable(); 4801 rc = kvm_xfer_to_guest_mode_handle_work(vcpu); 4802 if (rc) 4803 break; 4804 goto xfer_to_guest_mode_check; 4805 } 4806 4807 guest_timing_enter_irqoff(); 4808 __disable_cpu_timer_accounting(vcpu); 4809 4810 sie_return = kvm_s390_enter_exit_sie(vcpu->arch.sie_block, 4811 vcpu->run->s.regs.gprs, 4812 vcpu->arch.gmap->asce.val); 4813 4814 __enable_cpu_timer_accounting(vcpu); 4815 guest_timing_exit_irqoff(); 4816 local_irq_enable(); 4817 4818 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 4819 memcpy(vcpu->run->s.regs.gprs, 4820 sie_page->pv_grregs, 4821 sizeof(sie_page->pv_grregs)); 4822 /* 4823 * We're not allowed to inject interrupts on intercepts 4824 * that leave the guest state in an "in-between" state 4825 * where the next SIE entry will do a continuation. 4826 * Fence interrupts in our "internal" PSW. 4827 */ 4828 if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR || 4829 vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) { 4830 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; 4831 } 4832 } 4833 kvm_vcpu_srcu_read_lock(vcpu); 4834 4835 rc = vcpu_post_run(vcpu, sie_return); 4836 if (rc || guestdbg_exit_pending(vcpu)) { 4837 kvm_vcpu_srcu_read_unlock(vcpu); 4838 break; 4839 } 4840 } 4841 4842 return rc; 4843 } 4844 4845 static void sync_regs_fmt2(struct kvm_vcpu *vcpu) 4846 { 4847 struct kvm_run *kvm_run = vcpu->run; 4848 struct runtime_instr_cb *riccb; 4849 struct gs_cb *gscb; 4850 4851 riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb; 4852 gscb = (struct gs_cb *) &kvm_run->s.regs.gscb; 4853 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 4854 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 4855 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 4856 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 4857 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 4858 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 4859 } 4860 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 4861 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 4862 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 4863 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 4864 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4865 kvm_clear_async_pf_completion_queue(vcpu); 4866 } 4867 if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) { 4868 vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318; 4869 vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc; 4870 VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc); 4871 } 4872 /* 4873 * If userspace sets the riccb (e.g. after migration) to a valid state, 4874 * we should enable RI here instead of doing the lazy enablement. 4875 */ 4876 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) && 4877 test_kvm_facility(vcpu->kvm, 64) && 4878 riccb->v && 4879 !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) { 4880 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)"); 4881 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 4882 } 4883 /* 4884 * If userspace sets the gscb (e.g. after migration) to non-zero, 4885 * we should enable GS here instead of doing the lazy enablement. 4886 */ 4887 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) && 4888 test_kvm_facility(vcpu->kvm, 133) && 4889 gscb->gssm && 4890 !vcpu->arch.gs_enabled) { 4891 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)"); 4892 vcpu->arch.sie_block->ecb |= ECB_GS; 4893 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 4894 vcpu->arch.gs_enabled = 1; 4895 } 4896 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) && 4897 test_kvm_facility(vcpu->kvm, 82)) { 4898 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 4899 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0; 4900 } 4901 if (cpu_has_gs()) { 4902 preempt_disable(); 4903 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); 4904 if (current->thread.gs_cb) { 4905 vcpu->arch.host_gscb = current->thread.gs_cb; 4906 save_gs_cb(vcpu->arch.host_gscb); 4907 } 4908 if (vcpu->arch.gs_enabled) { 4909 current->thread.gs_cb = (struct gs_cb *) 4910 &vcpu->run->s.regs.gscb; 4911 restore_gs_cb(current->thread.gs_cb); 4912 } 4913 preempt_enable(); 4914 } 4915 /* SIE will load etoken directly from SDNX and therefore kvm_run */ 4916 } 4917 4918 static void sync_regs(struct kvm_vcpu *vcpu) 4919 { 4920 struct kvm_run *kvm_run = vcpu->run; 4921 4922 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 4923 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 4924 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 4925 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 4926 /* some control register changes require a tlb flush */ 4927 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 4928 } 4929 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 4930 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); 4931 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 4932 } 4933 save_access_regs(vcpu->arch.host_acrs); 4934 restore_access_regs(vcpu->run->s.regs.acrs); 4935 vcpu->arch.acrs_loaded = true; 4936 kvm_s390_fpu_load(vcpu->run); 4937 /* Sync fmt2 only data */ 4938 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) { 4939 sync_regs_fmt2(vcpu); 4940 } else { 4941 /* 4942 * In several places we have to modify our internal view to 4943 * not do things that are disallowed by the ultravisor. For 4944 * example we must not inject interrupts after specific exits 4945 * (e.g. 112 prefix page not secure). We do this by turning 4946 * off the machine check, external and I/O interrupt bits 4947 * of our PSW copy. To avoid getting validity intercepts, we 4948 * do only accept the condition code from userspace. 4949 */ 4950 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC; 4951 vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask & 4952 PSW_MASK_CC; 4953 } 4954 4955 kvm_run->kvm_dirty_regs = 0; 4956 } 4957 4958 static void store_regs_fmt2(struct kvm_vcpu *vcpu) 4959 { 4960 struct kvm_run *kvm_run = vcpu->run; 4961 4962 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 4963 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 4964 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 4965 kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; 4966 kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val; 4967 if (cpu_has_gs()) { 4968 preempt_disable(); 4969 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); 4970 if (vcpu->arch.gs_enabled) 4971 save_gs_cb(current->thread.gs_cb); 4972 current->thread.gs_cb = vcpu->arch.host_gscb; 4973 restore_gs_cb(vcpu->arch.host_gscb); 4974 if (!vcpu->arch.host_gscb) 4975 local_ctl_clear_bit(2, CR2_GUARDED_STORAGE_BIT); 4976 vcpu->arch.host_gscb = NULL; 4977 preempt_enable(); 4978 } 4979 /* SIE will save etoken directly into SDNX and therefore kvm_run */ 4980 } 4981 4982 static void store_regs(struct kvm_vcpu *vcpu) 4983 { 4984 struct kvm_run *kvm_run = vcpu->run; 4985 4986 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 4987 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 4988 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 4989 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 4990 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); 4991 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 4992 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 4993 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 4994 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 4995 save_access_regs(vcpu->run->s.regs.acrs); 4996 restore_access_regs(vcpu->arch.host_acrs); 4997 vcpu->arch.acrs_loaded = false; 4998 kvm_s390_fpu_store(vcpu->run); 4999 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) 5000 store_regs_fmt2(vcpu); 5001 } 5002 5003 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) 5004 { 5005 struct kvm_run *kvm_run = vcpu->run; 5006 DECLARE_KERNEL_FPU_ONSTACK32(fpu); 5007 int rc; 5008 5009 /* 5010 * Running a VM while dumping always has the potential to 5011 * produce inconsistent dump data. But for PV vcpus a SIE 5012 * entry while dumping could also lead to a fatal validity 5013 * intercept which we absolutely want to avoid. 5014 */ 5015 if (vcpu->kvm->arch.pv.dumping) 5016 return -EINVAL; 5017 5018 if (!vcpu->wants_to_run) 5019 return -EINTR; 5020 5021 if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS || 5022 kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS) 5023 return -EINVAL; 5024 5025 /* Pairs with smp_store_release() in kvm_arch_vcpu_postcreate() */ 5026 if (!smp_load_acquire(&vcpu->arch.initialized)) 5027 return -EINVAL; 5028 5029 vcpu_load(vcpu); 5030 5031 if (guestdbg_exit_pending(vcpu)) { 5032 kvm_s390_prepare_debug_exit(vcpu); 5033 rc = 0; 5034 goto out; 5035 } 5036 5037 kvm_sigset_activate(vcpu); 5038 5039 /* 5040 * no need to check the return value of vcpu_start as it can only have 5041 * an error for protvirt, but protvirt means user cpu state 5042 */ 5043 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 5044 kvm_s390_vcpu_start(vcpu); 5045 } else if (is_vcpu_stopped(vcpu)) { 5046 pr_err_ratelimited("can't run stopped vcpu %d\n", 5047 vcpu->vcpu_id); 5048 rc = -EINVAL; 5049 goto out_sigset; 5050 } 5051 5052 kernel_fpu_begin(&fpu, KERNEL_FPC | KERNEL_VXR); 5053 sync_regs(vcpu); 5054 enable_cpu_timer_accounting(vcpu); 5055 5056 might_fault(); 5057 rc = __vcpu_run(vcpu); 5058 5059 if (signal_pending(current) && !rc) { 5060 kvm_run->exit_reason = KVM_EXIT_INTR; 5061 vcpu->stat.signal_exits++; 5062 rc = -EINTR; 5063 } 5064 5065 if (guestdbg_exit_pending(vcpu) && !rc) { 5066 kvm_s390_prepare_debug_exit(vcpu); 5067 rc = 0; 5068 } 5069 5070 if (rc == -EREMOTE) { 5071 /* userspace support is needed, kvm_run has been prepared */ 5072 rc = 0; 5073 } 5074 5075 disable_cpu_timer_accounting(vcpu); 5076 store_regs(vcpu); 5077 kernel_fpu_end(&fpu, KERNEL_FPC | KERNEL_VXR); 5078 5079 vcpu->stat.exit_userspace++; 5080 5081 out_sigset: 5082 kvm_sigset_deactivate(vcpu); 5083 5084 out: 5085 vcpu_put(vcpu); 5086 return rc; 5087 } 5088 5089 /* 5090 * store status at address 5091 * we use have two special cases: 5092 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 5093 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 5094 */ 5095 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 5096 { 5097 unsigned char archmode = 1; 5098 freg_t fprs[NUM_FPRS]; 5099 unsigned int px; 5100 u64 clkcomp, cputm; 5101 int rc; 5102 5103 px = kvm_s390_get_prefix(vcpu); 5104 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 5105 if (write_guest_abs(vcpu, 163, &archmode, 1)) 5106 return -EFAULT; 5107 gpa = 0; 5108 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 5109 if (write_guest_real(vcpu, 163, &archmode, 1)) 5110 return -EFAULT; 5111 gpa = px; 5112 } else 5113 gpa -= __LC_FPREGS_SAVE_AREA; 5114 5115 /* manually convert vector registers if necessary */ 5116 if (cpu_has_vx()) { 5117 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 5118 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 5119 fprs, 128); 5120 } else { 5121 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 5122 vcpu->run->s.regs.fprs, 128); 5123 } 5124 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 5125 vcpu->run->s.regs.gprs, 128); 5126 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 5127 &vcpu->arch.sie_block->gpsw, 16); 5128 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 5129 &px, 4); 5130 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 5131 &vcpu->run->s.regs.fpc, 4); 5132 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 5133 &vcpu->arch.sie_block->todpr, 4); 5134 cputm = kvm_s390_get_cpu_timer(vcpu); 5135 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 5136 &cputm, 8); 5137 clkcomp = vcpu->arch.sie_block->ckc >> 8; 5138 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 5139 &clkcomp, 8); 5140 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 5141 &vcpu->run->s.regs.acrs, 64); 5142 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 5143 &vcpu->arch.sie_block->gcr, 128); 5144 return rc ? -EFAULT : 0; 5145 } 5146 5147 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 5148 { 5149 /* 5150 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 5151 * switch in the run ioctl. Let's update our copies before we save 5152 * it into the save area 5153 */ 5154 kvm_s390_fpu_store(vcpu->run); 5155 save_access_regs(vcpu->run->s.regs.acrs); 5156 5157 return kvm_s390_store_status_unloaded(vcpu, addr); 5158 } 5159 5160 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 5161 { 5162 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 5163 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 5164 } 5165 5166 static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 5167 { 5168 unsigned long i; 5169 struct kvm_vcpu *vcpu; 5170 5171 kvm_for_each_vcpu(i, vcpu, kvm) { 5172 __disable_ibs_on_vcpu(vcpu); 5173 } 5174 } 5175 5176 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 5177 { 5178 if (!sclp.has_ibs) 5179 return; 5180 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 5181 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 5182 } 5183 5184 int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 5185 { 5186 int i, online_vcpus, r = 0, started_vcpus = 0; 5187 5188 if (!is_vcpu_stopped(vcpu)) 5189 return 0; 5190 5191 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 5192 /* Only one cpu at a time may enter/leave the STOPPED state. */ 5193 spin_lock(&vcpu->kvm->arch.start_stop_lock); 5194 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 5195 5196 /* Let's tell the UV that we want to change into the operating state */ 5197 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5198 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR); 5199 if (r) { 5200 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5201 return r; 5202 } 5203 } 5204 5205 for (i = 0; i < online_vcpus; i++) { 5206 if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i))) 5207 started_vcpus++; 5208 } 5209 5210 if (started_vcpus == 0) { 5211 /* we're the only active VCPU -> speed it up */ 5212 __enable_ibs_on_vcpu(vcpu); 5213 } else if (started_vcpus == 1) { 5214 /* 5215 * As we are starting a second VCPU, we have to disable 5216 * the IBS facility on all VCPUs to remove potentially 5217 * outstanding ENABLE requests. 5218 */ 5219 __disable_ibs_on_all_vcpus(vcpu->kvm); 5220 } 5221 5222 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED); 5223 /* 5224 * The real PSW might have changed due to a RESTART interpreted by the 5225 * ultravisor. We block all interrupts and let the next sie exit 5226 * refresh our view. 5227 */ 5228 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5229 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; 5230 /* 5231 * Another VCPU might have used IBS while we were offline. 5232 * Let's play safe and flush the VCPU at startup. 5233 */ 5234 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 5235 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5236 return 0; 5237 } 5238 5239 int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 5240 { 5241 int i, online_vcpus, r = 0, started_vcpus = 0; 5242 struct kvm_vcpu *started_vcpu = NULL; 5243 5244 if (is_vcpu_stopped(vcpu)) 5245 return 0; 5246 5247 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 5248 /* Only one cpu at a time may enter/leave the STOPPED state. */ 5249 spin_lock(&vcpu->kvm->arch.start_stop_lock); 5250 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 5251 5252 /* Let's tell the UV that we want to change into the stopped state */ 5253 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5254 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP); 5255 if (r) { 5256 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5257 return r; 5258 } 5259 } 5260 5261 /* 5262 * Set the VCPU to STOPPED and THEN clear the interrupt flag, 5263 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders 5264 * have been fully processed. This will ensure that the VCPU 5265 * is kept BUSY if another VCPU is inquiring with SIGP SENSE. 5266 */ 5267 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED); 5268 kvm_s390_clear_stop_irq(vcpu); 5269 5270 __disable_ibs_on_vcpu(vcpu); 5271 5272 for (i = 0; i < online_vcpus; i++) { 5273 struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i); 5274 5275 if (!is_vcpu_stopped(tmp)) { 5276 started_vcpus++; 5277 started_vcpu = tmp; 5278 } 5279 } 5280 5281 if (started_vcpus == 1) { 5282 /* 5283 * As we only have one VCPU left, we want to enable the 5284 * IBS facility for that VCPU to speed it up. 5285 */ 5286 __enable_ibs_on_vcpu(started_vcpu); 5287 } 5288 5289 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5290 return 0; 5291 } 5292 5293 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 5294 struct kvm_enable_cap *cap) 5295 { 5296 int r; 5297 5298 if (cap->flags) 5299 return -EINVAL; 5300 5301 switch (cap->cap) { 5302 case KVM_CAP_S390_CSS_SUPPORT: 5303 if (!vcpu->kvm->arch.css_support) { 5304 vcpu->kvm->arch.css_support = 1; 5305 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 5306 trace_kvm_s390_enable_css(vcpu->kvm); 5307 } 5308 r = 0; 5309 break; 5310 default: 5311 r = -EINVAL; 5312 break; 5313 } 5314 return r; 5315 } 5316 5317 static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu, 5318 struct kvm_s390_mem_op *mop) 5319 { 5320 void __user *uaddr = (void __user *)mop->buf; 5321 void *sida_addr; 5322 int r = 0; 5323 5324 if (mop->flags || !mop->size) 5325 return -EINVAL; 5326 if (mop->size + mop->sida_offset < mop->size) 5327 return -EINVAL; 5328 if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block)) 5329 return -E2BIG; 5330 if (!kvm_s390_pv_cpu_is_protected(vcpu)) 5331 return -EINVAL; 5332 5333 sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset; 5334 5335 switch (mop->op) { 5336 case KVM_S390_MEMOP_SIDA_READ: 5337 if (copy_to_user(uaddr, sida_addr, mop->size)) 5338 r = -EFAULT; 5339 5340 break; 5341 case KVM_S390_MEMOP_SIDA_WRITE: 5342 if (copy_from_user(sida_addr, uaddr, mop->size)) 5343 r = -EFAULT; 5344 break; 5345 } 5346 return r; 5347 } 5348 5349 static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu, 5350 struct kvm_s390_mem_op *mop) 5351 { 5352 void __user *uaddr = (void __user *)mop->buf; 5353 void *tmpbuf __free(kvfree) = NULL; 5354 enum gacc_mode acc_mode; 5355 int r; 5356 5357 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION | 5358 KVM_S390_MEMOP_F_CHECK_ONLY | 5359 KVM_S390_MEMOP_F_SKEY_PROTECTION); 5360 if (r) 5361 return r; 5362 if (mop->ar >= NUM_ACRS) 5363 return -EINVAL; 5364 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5365 return -EINVAL; 5366 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 5367 tmpbuf = vmalloc(mop->size); 5368 if (!tmpbuf) 5369 return -ENOMEM; 5370 } 5371 5372 acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE; 5373 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 5374 r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, 5375 acc_mode, mop->key); 5376 } else if (acc_mode == GACC_FETCH) { 5377 r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, 5378 mop->size, mop->key); 5379 if (!r && copy_to_user(uaddr, tmpbuf, mop->size)) 5380 return -EFAULT; 5381 } else { 5382 if (copy_from_user(tmpbuf, uaddr, mop->size)) 5383 return -EFAULT; 5384 r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, 5385 mop->size, mop->key); 5386 } 5387 5388 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 5389 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 5390 5391 return r; 5392 } 5393 5394 static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu, 5395 struct kvm_s390_mem_op *mop) 5396 { 5397 int r, srcu_idx; 5398 5399 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 5400 5401 switch (mop->op) { 5402 case KVM_S390_MEMOP_LOGICAL_READ: 5403 case KVM_S390_MEMOP_LOGICAL_WRITE: 5404 r = kvm_s390_vcpu_mem_op(vcpu, mop); 5405 break; 5406 case KVM_S390_MEMOP_SIDA_READ: 5407 case KVM_S390_MEMOP_SIDA_WRITE: 5408 /* we are locked against sida going away by the vcpu->mutex */ 5409 r = kvm_s390_vcpu_sida_op(vcpu, mop); 5410 break; 5411 default: 5412 r = -EINVAL; 5413 } 5414 5415 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 5416 return r; 5417 } 5418 5419 long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, 5420 unsigned long arg) 5421 { 5422 struct kvm_vcpu *vcpu = filp->private_data; 5423 void __user *argp = (void __user *)arg; 5424 int rc; 5425 5426 switch (ioctl) { 5427 case KVM_S390_IRQ: { 5428 struct kvm_s390_irq s390irq; 5429 5430 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 5431 return -EFAULT; 5432 scoped_guard(srcu, &vcpu->kvm->srcu) 5433 rc = kvm_s390_inject_vcpu(vcpu, &s390irq); 5434 break; 5435 } 5436 case KVM_S390_INTERRUPT: { 5437 struct kvm_s390_interrupt s390int; 5438 struct kvm_s390_irq s390irq = {}; 5439 5440 if (kvm_is_ucontrol(vcpu->kvm)) 5441 return -EINVAL; 5442 if (copy_from_user(&s390int, argp, sizeof(s390int))) 5443 return -EFAULT; 5444 if (s390int_to_s390irq(&s390int, &s390irq)) 5445 return -EINVAL; 5446 scoped_guard(srcu, &vcpu->kvm->srcu) 5447 rc = kvm_s390_inject_vcpu(vcpu, &s390irq); 5448 break; 5449 } 5450 default: 5451 rc = -ENOIOCTLCMD; 5452 break; 5453 } 5454 5455 /* 5456 * To simplify single stepping of userspace-emulated instructions, 5457 * KVM_EXIT_S390_SIEIC exit sets KVM_GUESTDBG_EXIT_PENDING (see 5458 * should_handle_per_ifetch()). However, if userspace emulation injects 5459 * an interrupt, it needs to be cleared, so that KVM_EXIT_DEBUG happens 5460 * after (and not before) the interrupt delivery. 5461 */ 5462 if (!rc) 5463 vcpu->guest_debug &= ~KVM_GUESTDBG_EXIT_PENDING; 5464 5465 return rc; 5466 } 5467 5468 static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu, 5469 struct kvm_pv_cmd *cmd) 5470 { 5471 struct kvm_s390_pv_dmp dmp; 5472 void *data; 5473 int ret; 5474 5475 /* Dump initialization is a prerequisite */ 5476 if (!vcpu->kvm->arch.pv.dumping) 5477 return -EINVAL; 5478 5479 if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp))) 5480 return -EFAULT; 5481 5482 /* We only handle this subcmd right now */ 5483 if (dmp.subcmd != KVM_PV_DUMP_CPU) 5484 return -EINVAL; 5485 5486 /* CPU dump length is the same as create cpu storage donation. */ 5487 if (dmp.buff_len != uv_info.guest_cpu_stor_len) 5488 return -EINVAL; 5489 5490 data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL); 5491 if (!data) 5492 return -ENOMEM; 5493 5494 ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc); 5495 5496 VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x", 5497 vcpu->vcpu_id, cmd->rc, cmd->rrc); 5498 5499 if (ret) 5500 ret = -EINVAL; 5501 5502 /* On success copy over the dump data */ 5503 if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len)) 5504 ret = -EFAULT; 5505 5506 kvfree(data); 5507 return ret; 5508 } 5509 5510 long kvm_arch_vcpu_ioctl(struct file *filp, 5511 unsigned int ioctl, unsigned long arg) 5512 { 5513 struct kvm_vcpu *vcpu = filp->private_data; 5514 void __user *argp = (void __user *)arg; 5515 int idx; 5516 long r; 5517 u16 rc, rrc; 5518 5519 /* Pairs with smp_store_release() in kvm_arch_vcpu_postcreate() */ 5520 if (!smp_load_acquire(&vcpu->arch.initialized)) 5521 return -EINVAL; 5522 5523 vcpu_load(vcpu); 5524 5525 switch (ioctl) { 5526 case KVM_S390_STORE_STATUS: 5527 idx = srcu_read_lock(&vcpu->kvm->srcu); 5528 r = kvm_s390_store_status_unloaded(vcpu, arg); 5529 srcu_read_unlock(&vcpu->kvm->srcu, idx); 5530 break; 5531 case KVM_S390_SET_INITIAL_PSW: { 5532 psw_t psw; 5533 5534 r = -EFAULT; 5535 if (copy_from_user(&psw, argp, sizeof(psw))) 5536 break; 5537 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 5538 break; 5539 } 5540 case KVM_S390_CLEAR_RESET: 5541 r = 0; 5542 kvm_arch_vcpu_ioctl_clear_reset(vcpu); 5543 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5544 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5545 UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc); 5546 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x", 5547 rc, rrc); 5548 } 5549 break; 5550 case KVM_S390_INITIAL_RESET: 5551 r = 0; 5552 kvm_arch_vcpu_ioctl_initial_reset(vcpu); 5553 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5554 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5555 UVC_CMD_CPU_RESET_INITIAL, 5556 &rc, &rrc); 5557 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x", 5558 rc, rrc); 5559 } 5560 break; 5561 case KVM_S390_NORMAL_RESET: 5562 r = 0; 5563 kvm_arch_vcpu_ioctl_normal_reset(vcpu); 5564 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5565 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5566 UVC_CMD_CPU_RESET, &rc, &rrc); 5567 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x", 5568 rc, rrc); 5569 } 5570 break; 5571 case KVM_SET_ONE_REG: 5572 case KVM_GET_ONE_REG: { 5573 struct kvm_one_reg reg; 5574 r = -EINVAL; 5575 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5576 break; 5577 r = -EFAULT; 5578 if (copy_from_user(®, argp, sizeof(reg))) 5579 break; 5580 if (ioctl == KVM_SET_ONE_REG) 5581 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 5582 else 5583 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 5584 break; 5585 } 5586 #ifdef CONFIG_KVM_S390_UCONTROL 5587 case KVM_S390_UCAS_MAP: { 5588 struct kvm_s390_ucas_mapping ucas; 5589 5590 r = -EFAULT; 5591 if (copy_from_user(&ucas, argp, sizeof(ucas))) 5592 break; 5593 5594 r = -EINVAL; 5595 if (!kvm_is_ucontrol(vcpu->kvm)) 5596 break; 5597 if (!IS_ALIGNED(ucas.user_addr | ucas.vcpu_addr | ucas.length, _SEGMENT_SIZE)) 5598 break; 5599 5600 r = gmap_ucas_map(vcpu->arch.gmap, gpa_to_gfn(ucas.user_addr), 5601 gpa_to_gfn(ucas.vcpu_addr), 5602 ucas.length >> _SEGMENT_SHIFT); 5603 break; 5604 } 5605 case KVM_S390_UCAS_UNMAP: { 5606 struct kvm_s390_ucas_mapping ucas; 5607 5608 r = -EFAULT; 5609 if (copy_from_user(&ucas, argp, sizeof(ucas))) 5610 break; 5611 5612 r = -EINVAL; 5613 if (!kvm_is_ucontrol(vcpu->kvm)) 5614 break; 5615 if (!IS_ALIGNED(ucas.vcpu_addr | ucas.length, _SEGMENT_SIZE)) 5616 break; 5617 5618 gmap_ucas_unmap(vcpu->arch.gmap, gpa_to_gfn(ucas.vcpu_addr), 5619 ucas.length >> _SEGMENT_SHIFT); 5620 r = 0; 5621 break; 5622 } 5623 #endif 5624 case KVM_S390_VCPU_FAULT: { 5625 gpa_t gaddr = arg; 5626 5627 scoped_guard(srcu, &vcpu->kvm->srcu) { 5628 r = vcpu_ucontrol_translate(vcpu, &gaddr); 5629 if (r) 5630 break; 5631 5632 r = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(gaddr), false); 5633 if (r == PGM_ADDRESSING) 5634 r = -EFAULT; 5635 if (r <= 0) 5636 break; 5637 r = -EIO; 5638 KVM_BUG_ON(r, vcpu->kvm); 5639 } 5640 break; 5641 } 5642 case KVM_ENABLE_CAP: 5643 { 5644 struct kvm_enable_cap cap; 5645 r = -EFAULT; 5646 if (copy_from_user(&cap, argp, sizeof(cap))) 5647 break; 5648 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 5649 break; 5650 } 5651 case KVM_S390_MEM_OP: { 5652 struct kvm_s390_mem_op mem_op; 5653 5654 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 5655 r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op); 5656 else 5657 r = -EFAULT; 5658 break; 5659 } 5660 case KVM_S390_SET_IRQ_STATE: { 5661 struct kvm_s390_irq_state irq_state; 5662 5663 r = -EFAULT; 5664 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 5665 break; 5666 if (irq_state.len > VCPU_IRQS_MAX_BUF || 5667 irq_state.len == 0 || 5668 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 5669 r = -EINVAL; 5670 break; 5671 } 5672 /* do not use irq_state.flags, it will break old QEMUs */ 5673 r = kvm_s390_set_irq_state(vcpu, 5674 (void __user *) irq_state.buf, 5675 irq_state.len); 5676 break; 5677 } 5678 case KVM_S390_GET_IRQ_STATE: { 5679 struct kvm_s390_irq_state irq_state; 5680 5681 r = -EFAULT; 5682 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 5683 break; 5684 if (irq_state.len == 0) { 5685 r = -EINVAL; 5686 break; 5687 } 5688 /* do not use irq_state.flags, it will break old QEMUs */ 5689 r = kvm_s390_get_irq_state(vcpu, 5690 (__u8 __user *) irq_state.buf, 5691 irq_state.len); 5692 break; 5693 } 5694 case KVM_S390_PV_CPU_COMMAND: { 5695 struct kvm_pv_cmd cmd; 5696 5697 r = -EINVAL; 5698 if (!is_prot_virt_host()) 5699 break; 5700 5701 r = -EFAULT; 5702 if (copy_from_user(&cmd, argp, sizeof(cmd))) 5703 break; 5704 5705 r = -EINVAL; 5706 if (cmd.flags) 5707 break; 5708 5709 /* We only handle this cmd right now */ 5710 if (cmd.cmd != KVM_PV_DUMP) 5711 break; 5712 5713 r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd); 5714 5715 /* Always copy over UV rc / rrc data */ 5716 if (copy_to_user(argp + offsetof(struct kvm_pv_cmd, rc), &cmd.rc, 5717 sizeof(cmd.rc) + sizeof(cmd.rrc))) 5718 r = -EFAULT; 5719 break; 5720 } 5721 default: 5722 r = -ENOTTY; 5723 } 5724 5725 vcpu_put(vcpu); 5726 return r; 5727 } 5728 5729 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 5730 { 5731 #ifdef CONFIG_KVM_S390_UCONTROL 5732 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 5733 && (kvm_is_ucontrol(vcpu->kvm))) { 5734 vmf->page = virt_to_page(vcpu->arch.sie_block); 5735 get_page(vmf->page); 5736 return 0; 5737 } 5738 #endif 5739 return VM_FAULT_SIGBUS; 5740 } 5741 5742 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) 5743 { 5744 return true; 5745 } 5746 5747 /* Section: memory related */ 5748 int kvm_arch_prepare_memory_region(struct kvm *kvm, 5749 const struct kvm_memory_slot *old, 5750 struct kvm_memory_slot *new, 5751 enum kvm_mr_change change) 5752 { 5753 return s390_kvm_mmu_prepare_memory_region(kvm, old, new, change); 5754 } 5755 5756 static long cmma_d_count_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk) 5757 { 5758 union pgste pgste; 5759 5760 pgste = pgste_get_lock(ptep); 5761 if (pgste.cmma_d) { 5762 pgste.cmma_d = 0; 5763 atomic64_dec(walk->priv); 5764 } 5765 pgste_set_unlock(ptep, pgste); 5766 return 0; 5767 } 5768 5769 void kvm_s390_update_cmma_dirty(struct kvm *kvm, const struct kvm_memory_slot *old) 5770 { 5771 const struct dat_walk_ops ops = { .pte_entry = cmma_d_count_pte, }; 5772 5773 if (kvm->arch.migration_mode && kvm->arch.use_cmma && old) { 5774 _dat_walk_gfn_range(old->base_gfn, old->base_gfn + old->npages, 5775 kvm->arch.gmap->asce, &ops, DAT_WALK_IGN_HOLES, 5776 &kvm->arch.cmma_dirty_pages); 5777 } 5778 } 5779 5780 void kvm_arch_commit_memory_region(struct kvm *kvm, struct kvm_memory_slot *old, 5781 const struct kvm_memory_slot *new, 5782 enum kvm_mr_change change) 5783 { 5784 } 5785 5786 /** 5787 * kvm_arch_vcpu_pre_fault_memory() -- pre-fault and link gmap dat tables 5788 * @vcpu: the vcpu that shall appear to have generated the fault-in. 5789 * @range: the range that needs to be faulted in. 5790 * 5791 * The first page of the given range is faulted in and the corresponding gmap 5792 * page tables are created, as if the given vCPU had performed a read 5793 * operation. 5794 * If the range starts outside any memslots, an error is returned. An error is 5795 * also returned for UCONTROL VMs, which should instead use the 5796 * KVM_S390_VCPU_FAULT ioctl. 5797 * 5798 * Return: 5799 * * %-ENOENT if the range lies outside of a memslot. 5800 * * %-EINVAL in case of invalid state (for example if the VM is UCONTROL). 5801 * * %-EIO if errors happen while faulting-in the page (will trigger a warning 5802 * in the caller). 5803 * * other error codes < 0 in case of other errors. 5804 * * otherwise a number > 0 of bytes that have been faulted in successfully. 5805 */ 5806 long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, struct kvm_pre_fault_memory *range) 5807 { 5808 struct guest_fault f = { .gfn = gpa_to_gfn(range->gpa), }; 5809 gpa_t end; 5810 int rc; 5811 5812 if (kvm_is_ucontrol(vcpu->kvm)) 5813 return -EINVAL; 5814 5815 rc = kvm_s390_faultin_gfn(vcpu, NULL, &f); 5816 if (rc == PGM_ADDRESSING) 5817 return -ENOENT; 5818 if (rc > 0) 5819 return -EIO; 5820 if (rc < 0) 5821 return rc; 5822 5823 if (f.ptep) 5824 return PAGE_SIZE; 5825 5826 end = ALIGN(range->gpa + PAGE_SIZE, f.crste_region3 ? _REGION3_SIZE : HPAGE_SIZE); 5827 return min(range->size, end - range->gpa); 5828 } 5829 5830 /** 5831 * kvm_test_age_gfn() - test young 5832 * @kvm: the kvm instance 5833 * @range: the range of guest addresses whose young status needs to be cleared 5834 * 5835 * Context: called by KVM common code without holding the kvm mmu lock 5836 * Return: true if any page in the given range is young, otherwise 0. 5837 */ 5838 bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) 5839 { 5840 scoped_guard(read_lock, &kvm->mmu_lock) 5841 return dat_test_age_gfn(kvm->arch.gmap->asce, range->start, range->end); 5842 } 5843 5844 /** 5845 * kvm_age_gfn() - clear young 5846 * @kvm: the kvm instance 5847 * @range: the range of guest addresses whose young status needs to be cleared 5848 * 5849 * Context: called by KVM common code without holding the kvm mmu lock 5850 * Return: true if any page in the given range was young, otherwise 0. 5851 */ 5852 bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) 5853 { 5854 scoped_guard(read_lock, &kvm->mmu_lock) 5855 return gmap_age_gfn(kvm->arch.gmap, range->start, range->end); 5856 } 5857 5858 /** 5859 * kvm_unmap_gfn_range() - Unmap a range of guest addresses 5860 * @kvm: the kvm instance 5861 * @range: the range of guest page frames to invalidate 5862 * 5863 * This function always returns false because every DAT table modification 5864 * has to use the appropriate DAT table manipulation instructions, which will 5865 * keep the TLB coherent, hence no additional TLB flush is ever required. 5866 * 5867 * Context: called by KVM common code with the kvm mmu write lock held 5868 * Return: false 5869 */ 5870 bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) 5871 { 5872 return gmap_unmap_gfn_range(kvm->arch.gmap, range->slot, range->start, range->end); 5873 } 5874 5875 static inline unsigned long nonhyp_mask(int i) 5876 { 5877 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; 5878 5879 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); 5880 } 5881 5882 static int __init kvm_s390_init(void) 5883 { 5884 int i, r; 5885 5886 if (!sclp.has_sief2) { 5887 pr_info("SIE is not available\n"); 5888 return -ENODEV; 5889 } 5890 5891 if (hpage_2g && !hpage) { 5892 hpage_2g = 0; 5893 pr_info("Disabling 2G hugepage support, since 1M hugepage support is not enabled.\n"); 5894 } 5895 5896 for (i = 0; i < HMFAI_DWORDS; i++) 5897 kvm_s390_fac_base[i] |= nonhyp_mask(i); 5898 5899 r = __kvm_s390_init(); 5900 if (r) 5901 return r; 5902 5903 r = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); 5904 if (r) { 5905 __kvm_s390_exit(); 5906 return r; 5907 } 5908 return 0; 5909 } 5910 5911 static void __exit kvm_s390_exit(void) 5912 { 5913 kvm_exit(); 5914 5915 __kvm_s390_exit(); 5916 } 5917 5918 module_init(kvm_s390_init); 5919 module_exit(kvm_s390_exit); 5920 5921 /* 5922 * Enable autoloading of the kvm module. 5923 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 5924 * since x86 takes a different approach. 5925 */ 5926 #include <linux/miscdevice.h> 5927 MODULE_ALIAS_MISCDEV(KVM_MINOR); 5928 MODULE_ALIAS("devname:kvm"); 5929