arch/s390/kvm/kvm-s390.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * definition for kvm on s390
   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  */
  11
  12 #ifndef ARCH_S390_KVM_S390_H
  13 #define ARCH_S390_KVM_S390_H
  14
  15 #include <linux/hrtimer.h>
  16 #include <linux/kvm.h>
  17 #include <linux/kvm_host.h>
  18 #include <linux/lockdep.h>
  19 #include <asm/facility.h>
  20 #include <asm/processor.h>
  21 #include <asm/sclp.h>
  22
  23 /* Transactional Memory Execution related macros */
  24 #define IS_TE_ENABLED(vcpu)     ((vcpu->arch.sie_block->ecb & ECB_TE))
  25 #define TDB_FORMAT1             1
  26 #define IS_ITDB_VALID(vcpu)     ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
  27
  28 extern debug_info_t *kvm_s390_dbf;
  29 extern debug_info_t *kvm_s390_dbf_uv;
  30
  31 #define KVM_UV_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
  32 do { \
  33         debug_sprintf_event((d_kvm)->arch.dbf, d_loglevel, d_string "\n", \
  34           d_args); \
  35         debug_sprintf_event(kvm_s390_dbf_uv, d_loglevel, \
  36                             "%d: " d_string "\n", (d_kvm)->userspace_pid, \
  37                             d_args); \
  38 } while (0)
  39
  40 #define KVM_EVENT(d_loglevel, d_string, d_args...)\
  41 do { \
  42         debug_sprintf_event(kvm_s390_dbf, d_loglevel, d_string "\n", \
  43           d_args); \
  44 } while (0)
  45
  46 #define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
  47 do { \
  48         debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
  49           d_args); \
  50 } while (0)
  51
  52 #define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
  53 do { \
  54         debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
  55           "%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
  56           d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
  57           d_args); \
  58 } while (0)
  59
  60 static inline void kvm_s390_set_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  61 {
  62         atomic_or(flags, &vcpu->arch.sie_block->cpuflags);
  63 }
  64
  65 static inline void kvm_s390_clear_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  66 {
  67         atomic_andnot(flags, &vcpu->arch.sie_block->cpuflags);
  68 }
  69
  70 static inline bool kvm_s390_test_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  71 {
  72         return (atomic_read(&vcpu->arch.sie_block->cpuflags) & flags) == flags;
  73 }
  74
  75 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
  76 {
  77         return kvm_s390_test_cpuflags(vcpu, CPUSTAT_STOPPED);
  78 }
  79
  80 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
  81 {
  82         return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
  83 }
  84
  85 static inline int kvm_is_ucontrol(struct kvm *kvm)
  86 {
  87 #ifdef CONFIG_KVM_S390_UCONTROL
  88         if (kvm->arch.gmap)
  89                 return 0;
  90         return 1;
  91 #else
  92         return 0;
  93 #endif
  94 }
  95
  96 #define GUEST_PREFIX_SHIFT 13
  97 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
  98 {
  99         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
 100 }
 101
 102 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
 103 {
 104         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
 105                    prefix);
 106         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
 107         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 108         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
 109 }
 110
 111 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, u8 *ar)
 112 {
 113         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 114         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 115
 116         if (ar)
 117                 *ar = base2;
 118
 119         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 120 }
 121
 122 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
 123                                               u64 *address1, u64 *address2,
 124                                               u8 *ar_b1, u8 *ar_b2)
 125 {
 126         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
 127         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
 128         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
 129         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
 130
 131         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
 132         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 133
 134         if (ar_b1)
 135                 *ar_b1 = base1;
 136         if (ar_b2)
 137                 *ar_b2 = base2;
 138 }
 139
 140 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 141 {
 142         if (r1)
 143                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
 144         if (r2)
 145                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 146 }
 147
 148 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, u8 *ar)
 149 {
 150         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 151         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
 152                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
 153         /* The displacement is a 20bit _SIGNED_ value */
 154         if (disp2 & 0x80000)
 155                 disp2+=0xfff00000;
 156
 157         if (ar)
 158                 *ar = base2;
 159
 160         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
 161 }
 162
 163 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, u8 *ar)
 164 {
 165         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 166         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 167
 168         if (ar)
 169                 *ar = base2;
 170
 171         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 172 }
 173
 174 /* Set the condition code in the guest program status word */
 175 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
 176 {
 177         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
 178         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
 179 }
 180
 181 /* test availability of facility in a kvm instance */
 182 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
 183 {
 184         return __test_facility(nr, kvm->arch.model.fac_mask) &&
 185                 __test_facility(nr, kvm->arch.model.fac_list);
 186 }
 187
 188 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
 189 {
 190         unsigned char *ptr;
 191
 192         if (nr >= MAX_FACILITY_BIT)
 193                 return -EINVAL;
 194         ptr = (unsigned char *) fac_list + (nr >> 3);
 195         *ptr |= (0x80UL >> (nr & 7));
 196         return 0;
 197 }
 198
 199 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
 200 {
 201         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
 202         return test_bit_inv(nr, kvm->arch.cpu_feat);
 203 }
 204
 205 /* are cpu states controlled by user space */
 206 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
 207 {
 208         return kvm->arch.user_cpu_state_ctrl != 0;
 209 }
 210
 211 /* implemented in pv.c */
 212 int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);
 213 int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);
 214 int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc);
 215 int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc);
 216 int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc,
 217                               u16 *rrc);
 218 int kvm_s390_pv_unpack(struct kvm *kvm, unsigned long addr, unsigned long size,
 219                        unsigned long tweak, u16 *rc, u16 *rrc);
 220 int kvm_s390_pv_set_cpu_state(struct kvm_vcpu *vcpu, u8 state);
 221
 222 static inline u64 kvm_s390_pv_get_handle(struct kvm *kvm)
 223 {
 224         return kvm->arch.pv.handle;
 225 }
 226
 227 static inline u64 kvm_s390_pv_cpu_get_handle(struct kvm_vcpu *vcpu)
 228 {
 229         return vcpu->arch.pv.handle;
 230 }
 231
 232 static inline bool kvm_s390_pv_is_protected(struct kvm *kvm)
 233 {
 234         lockdep_assert_held(&kvm->lock);
 235         return !!kvm_s390_pv_get_handle(kvm);
 236 }
 237
 238 static inline bool kvm_s390_pv_cpu_is_protected(struct kvm_vcpu *vcpu)
 239 {
 240         lockdep_assert_held(&vcpu->mutex);
 241         return !!kvm_s390_pv_cpu_get_handle(vcpu);
 242 }
 243
 244 /* implemented in interrupt.c */
 245 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
 246 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
 247 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 248 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 249 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 250 void kvm_s390_clear_float_irqs(struct kvm *kvm);
 251 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
 252                                     struct kvm_s390_interrupt *s390int);
 253 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 254                                       struct kvm_s390_irq *irq);
 255 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 256                                            struct kvm_s390_pgm_info *pgm_info)
 257 {
 258         struct kvm_s390_irq irq = {
 259                 .type = KVM_S390_PROGRAM_INT,
 260                 .u.pgm = *pgm_info,
 261         };
 262
 263         return kvm_s390_inject_vcpu(vcpu, &irq);
 264 }
 265 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 266 {
 267         struct kvm_s390_irq irq = {
 268                 .type = KVM_S390_PROGRAM_INT,
 269                 .u.pgm.code = code,
 270         };
 271
 272         return kvm_s390_inject_vcpu(vcpu, &irq);
 273 }
 274 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 275                                                     u64 isc_mask, u32 schid);
 276 int kvm_s390_reinject_io_int(struct kvm *kvm,
 277                              struct kvm_s390_interrupt_info *inti);
 278 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
 279
 280 /* implemented in intercept.c */
 281 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
 282 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
 283 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
 284 {
 285         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 286
 287         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
 288 }
 289 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
 290 {
 291         kvm_s390_rewind_psw(vcpu, -ilen);
 292 }
 293 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
 294 {
 295         /* don't inject PER events if we re-execute the instruction */
 296         vcpu->arch.sie_block->icptstatus &= ~0x02;
 297         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
 298 }
 299
 300 int handle_sthyi(struct kvm_vcpu *vcpu);
 301
 302 /* implemented in priv.c */
 303 int is_valid_psw(psw_t *psw);
 304 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);
 305 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
 306 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu);
 307 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
 308 int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
 309 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
 310 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
 311 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
 312 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
 313 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
 314 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu);
 315
 316 /* implemented in vsie.c */
 317 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu);
 318 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu);
 319 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
 320                                  unsigned long end);
 321 void kvm_s390_vsie_init(struct kvm *kvm);
 322 void kvm_s390_vsie_destroy(struct kvm *kvm);
 323
 324 /* implemented in sigp.c */
 325 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
 326 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
 327
 328 /* implemented in kvm-s390.c */
 329 void kvm_s390_set_tod_clock(struct kvm *kvm,
 330                             const struct kvm_s390_vm_tod_clock *gtod);
 331 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
 332 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
 333 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
 334 int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
 335 int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
 336 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
 337 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
 338 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu);
 339 void exit_sie(struct kvm_vcpu *vcpu);
 340 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
 341 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
 342 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
 343 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
 344 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
 345
 346 /* implemented in diag.c */
 347 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
 348
 349 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
 350 {
 351         int i;
 352         struct kvm_vcpu *vcpu;
 353
 354         WARN_ON(!mutex_is_locked(&kvm->lock));
 355         kvm_for_each_vcpu(i, vcpu, kvm)
 356                 kvm_s390_vcpu_block(vcpu);
 357 }
 358
 359 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
 360 {
 361         int i;
 362         struct kvm_vcpu *vcpu;
 363
 364         kvm_for_each_vcpu(i, vcpu, kvm)
 365                 kvm_s390_vcpu_unblock(vcpu);
 366 }
 367
 368 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
 369 {
 370         u64 rc;
 371
 372         preempt_disable();
 373         rc = get_tod_clock_fast() + kvm->arch.epoch;
 374         preempt_enable();
 375         return rc;
 376 }
 377
 378 /**
 379  * kvm_s390_inject_prog_cond - conditionally inject a program check
 380  * @vcpu: virtual cpu
 381  * @rc: original return/error code
 382  *
 383  * This function is supposed to be used after regular guest access functions
 384  * failed, to conditionally inject a program check to a vcpu. The typical
 385  * pattern would look like
 386  *
 387  * rc = write_guest(vcpu, addr, data, len);
 388  * if (rc)
 389  *      return kvm_s390_inject_prog_cond(vcpu, rc);
 390  *
 391  * A negative return code from guest access functions implies an internal error
 392  * like e.g. out of memory. In these cases no program check should be injected
 393  * to the guest.
 394  * A positive value implies that an exception happened while accessing a guest's
 395  * memory. In this case all data belonging to the corresponding program check
 396  * has been stored in vcpu->arch.pgm and can be injected with
 397  * kvm_s390_inject_prog_irq().
 398  *
 399  * Returns: - the original @rc value if @rc was negative (internal error)
 400  *          - zero if @rc was already zero
 401  *          - zero or error code from injecting if @rc was positive
 402  *            (program check injected to @vcpu)
 403  */
 404 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
 405 {
 406         if (rc <= 0)
 407                 return rc;
 408         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 409 }
 410
 411 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
 412                         struct kvm_s390_irq *s390irq);
 413
 414 /* implemented in interrupt.c */
 415 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
 416 int psw_extint_disabled(struct kvm_vcpu *vcpu);
 417 void kvm_s390_destroy_adapters(struct kvm *kvm);
 418 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 419 extern struct kvm_device_ops kvm_flic_ops;
 420 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
 421 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 422 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 423                            void __user *buf, int len);
 424 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 425                            __u8 __user *buf, int len);
 426 void kvm_s390_gisa_init(struct kvm *kvm);
 427 void kvm_s390_gisa_clear(struct kvm *kvm);
 428 void kvm_s390_gisa_destroy(struct kvm *kvm);
 429 int kvm_s390_gib_init(u8 nisc);
 430 void kvm_s390_gib_destroy(void);
 431
 432 /* implemented in guestdbg.c */
 433 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
 434 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
 435 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
 436 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 437                             struct kvm_guest_debug *dbg);
 438 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
 439 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
 440 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
 441 int kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
 442
 443 /* support for Basic/Extended SCA handling */
 444 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
 445 {
 446         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
 447
 448         return &sca->ipte_control;
 449 }
 450 static inline int kvm_s390_use_sca_entries(void)
 451 {
 452         /*
 453          * Without SIGP interpretation, only SRS interpretation (if available)
 454          * might use the entries. By not setting the entries and keeping them
 455          * invalid, hardware will not access them but intercept.
 456          */
 457         return sclp.has_sigpif;
 458 }
 459 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
 460                                      struct mcck_volatile_info *mcck_info);
 461
 462 /**
 463  * kvm_s390_vcpu_crypto_reset_all
 464  *
 465  * Reset the crypto attributes for each vcpu. This can be done while the vcpus
 466  * are running as each vcpu will be removed from SIE before resetting the crypt
 467  * attributes and restored to SIE afterward.
 468  *
 469  * Note: The kvm->lock must be held while calling this function
 470  *
 471  * @kvm: the KVM guest
 472  */
 473 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm);
 474 #endif