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, 2009
   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 <asm/facility.h>
  19 #include <asm/processor.h>
  20 #include <asm/sclp.h>
  21
  22 /* Transactional Memory Execution related macros */
  23 #define IS_TE_ENABLED(vcpu)     ((vcpu->arch.sie_block->ecb & ECB_TE))
  24 #define TDB_FORMAT1             1
  25 #define IS_ITDB_VALID(vcpu)     ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
  26
  27 extern debug_info_t *kvm_s390_dbf;
  28 #define KVM_EVENT(d_loglevel, d_string, d_args...)\
  29 do { \
  30         debug_sprintf_event(kvm_s390_dbf, d_loglevel, d_string "\n", \
  31           d_args); \
  32 } while (0)
  33
  34 #define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
  35 do { \
  36         debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
  37           d_args); \
  38 } while (0)
  39
  40 #define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
  41 do { \
  42         debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
  43           "%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
  44           d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
  45           d_args); \
  46 } while (0)
  47
  48 static inline void kvm_s390_set_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  49 {
  50         atomic_or(flags, &vcpu->arch.sie_block->cpuflags);
  51 }
  52
  53 static inline void kvm_s390_clear_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  54 {
  55         atomic_andnot(flags, &vcpu->arch.sie_block->cpuflags);
  56 }
  57
  58 static inline bool kvm_s390_test_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  59 {
  60         return (atomic_read(&vcpu->arch.sie_block->cpuflags) & flags) == flags;
  61 }
  62
  63 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
  64 {
  65         return kvm_s390_test_cpuflags(vcpu, CPUSTAT_STOPPED);
  66 }
  67
  68 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
  69 {
  70         return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
  71 }
  72
  73 static inline int kvm_is_ucontrol(struct kvm *kvm)
  74 {
  75 #ifdef CONFIG_KVM_S390_UCONTROL
  76         if (kvm->arch.gmap)
  77                 return 0;
  78         return 1;
  79 #else
  80         return 0;
  81 #endif
  82 }
  83
  84 #define GUEST_PREFIX_SHIFT 13
  85 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
  86 {
  87         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
  88 }
  89
  90 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
  91 {
  92         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
  93                    prefix);
  94         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
  95         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
  96         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
  97 }
  98
  99 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, u8 *ar)
 100 {
 101         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 102         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 103
 104         if (ar)
 105                 *ar = base2;
 106
 107         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 108 }
 109
 110 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
 111                                               u64 *address1, u64 *address2,
 112                                               u8 *ar_b1, u8 *ar_b2)
 113 {
 114         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
 115         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
 116         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
 117         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
 118
 119         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
 120         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 121
 122         if (ar_b1)
 123                 *ar_b1 = base1;
 124         if (ar_b2)
 125                 *ar_b2 = base2;
 126 }
 127
 128 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 129 {
 130         if (r1)
 131                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
 132         if (r2)
 133                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 134 }
 135
 136 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, u8 *ar)
 137 {
 138         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 139         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
 140                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
 141         /* The displacement is a 20bit _SIGNED_ value */
 142         if (disp2 & 0x80000)
 143                 disp2+=0xfff00000;
 144
 145         if (ar)
 146                 *ar = base2;
 147
 148         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
 149 }
 150
 151 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, u8 *ar)
 152 {
 153         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 154         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 155
 156         if (ar)
 157                 *ar = base2;
 158
 159         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 160 }
 161
 162 /* Set the condition code in the guest program status word */
 163 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
 164 {
 165         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
 166         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
 167 }
 168
 169 /* test availability of facility in a kvm instance */
 170 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
 171 {
 172         return __test_facility(nr, kvm->arch.model.fac_mask) &&
 173                 __test_facility(nr, kvm->arch.model.fac_list);
 174 }
 175
 176 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
 177 {
 178         unsigned char *ptr;
 179
 180         if (nr >= MAX_FACILITY_BIT)
 181                 return -EINVAL;
 182         ptr = (unsigned char *) fac_list + (nr >> 3);
 183         *ptr |= (0x80UL >> (nr & 7));
 184         return 0;
 185 }
 186
 187 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
 188 {
 189         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
 190         return test_bit_inv(nr, kvm->arch.cpu_feat);
 191 }
 192
 193 /* are cpu states controlled by user space */
 194 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
 195 {
 196         return kvm->arch.user_cpu_state_ctrl != 0;
 197 }
 198
 199 /* implemented in interrupt.c */
 200 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
 201 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
 202 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 203 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 204 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 205 void kvm_s390_clear_float_irqs(struct kvm *kvm);
 206 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
 207                                     struct kvm_s390_interrupt *s390int);
 208 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 209                                       struct kvm_s390_irq *irq);
 210 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 211                                            struct kvm_s390_pgm_info *pgm_info)
 212 {
 213         struct kvm_s390_irq irq = {
 214                 .type = KVM_S390_PROGRAM_INT,
 215                 .u.pgm = *pgm_info,
 216         };
 217
 218         return kvm_s390_inject_vcpu(vcpu, &irq);
 219 }
 220 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 221 {
 222         struct kvm_s390_irq irq = {
 223                 .type = KVM_S390_PROGRAM_INT,
 224                 .u.pgm.code = code,
 225         };
 226
 227         return kvm_s390_inject_vcpu(vcpu, &irq);
 228 }
 229 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 230                                                     u64 isc_mask, u32 schid);
 231 int kvm_s390_reinject_io_int(struct kvm *kvm,
 232                              struct kvm_s390_interrupt_info *inti);
 233 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
 234
 235 /* implemented in intercept.c */
 236 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
 237 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
 238 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
 239 {
 240         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 241
 242         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
 243 }
 244 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
 245 {
 246         kvm_s390_rewind_psw(vcpu, -ilen);
 247 }
 248 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
 249 {
 250         /* don't inject PER events if we re-execute the instruction */
 251         vcpu->arch.sie_block->icptstatus &= ~0x02;
 252         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
 253 }
 254
 255 int handle_sthyi(struct kvm_vcpu *vcpu);
 256
 257 /* implemented in priv.c */
 258 int is_valid_psw(psw_t *psw);
 259 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);
 260 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
 261 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu);
 262 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
 263 int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
 264 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
 265 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
 266 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
 267 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
 268 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
 269 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu);
 270
 271 /* implemented in vsie.c */
 272 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu);
 273 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu);
 274 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
 275                                  unsigned long end);
 276 void kvm_s390_vsie_init(struct kvm *kvm);
 277 void kvm_s390_vsie_destroy(struct kvm *kvm);
 278
 279 /* implemented in sigp.c */
 280 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
 281 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
 282
 283 /* implemented in kvm-s390.c */
 284 void kvm_s390_set_tod_clock(struct kvm *kvm,
 285                             const struct kvm_s390_vm_tod_clock *gtod);
 286 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
 287 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
 288 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
 289 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
 290 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
 291 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
 292 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
 293 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu);
 294 void exit_sie(struct kvm_vcpu *vcpu);
 295 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
 296 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
 297 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
 298 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
 299 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
 300
 301 /* implemented in diag.c */
 302 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
 303
 304 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
 305 {
 306         int i;
 307         struct kvm_vcpu *vcpu;
 308
 309         WARN_ON(!mutex_is_locked(&kvm->lock));
 310         kvm_for_each_vcpu(i, vcpu, kvm)
 311                 kvm_s390_vcpu_block(vcpu);
 312 }
 313
 314 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
 315 {
 316         int i;
 317         struct kvm_vcpu *vcpu;
 318
 319         kvm_for_each_vcpu(i, vcpu, kvm)
 320                 kvm_s390_vcpu_unblock(vcpu);
 321 }
 322
 323 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
 324 {
 325         u64 rc;
 326
 327         preempt_disable();
 328         rc = get_tod_clock_fast() + kvm->arch.epoch;
 329         preempt_enable();
 330         return rc;
 331 }
 332
 333 /**
 334  * kvm_s390_inject_prog_cond - conditionally inject a program check
 335  * @vcpu: virtual cpu
 336  * @rc: original return/error code
 337  *
 338  * This function is supposed to be used after regular guest access functions
 339  * failed, to conditionally inject a program check to a vcpu. The typical
 340  * pattern would look like
 341  *
 342  * rc = write_guest(vcpu, addr, data, len);
 343  * if (rc)
 344  *      return kvm_s390_inject_prog_cond(vcpu, rc);
 345  *
 346  * A negative return code from guest access functions implies an internal error
 347  * like e.g. out of memory. In these cases no program check should be injected
 348  * to the guest.
 349  * A positive value implies that an exception happened while accessing a guest's
 350  * memory. In this case all data belonging to the corresponding program check
 351  * has been stored in vcpu->arch.pgm and can be injected with
 352  * kvm_s390_inject_prog_irq().
 353  *
 354  * Returns: - the original @rc value if @rc was negative (internal error)
 355  *          - zero if @rc was already zero
 356  *          - zero or error code from injecting if @rc was positive
 357  *            (program check injected to @vcpu)
 358  */
 359 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
 360 {
 361         if (rc <= 0)
 362                 return rc;
 363         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 364 }
 365
 366 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
 367                         struct kvm_s390_irq *s390irq);
 368
 369 /* implemented in interrupt.c */
 370 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
 371 int psw_extint_disabled(struct kvm_vcpu *vcpu);
 372 void kvm_s390_destroy_adapters(struct kvm *kvm);
 373 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 374 extern struct kvm_device_ops kvm_flic_ops;
 375 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
 376 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 377 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 378                            void __user *buf, int len);
 379 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 380                            __u8 __user *buf, int len);
 381 void kvm_s390_gisa_init(struct kvm *kvm);
 382 void kvm_s390_gisa_clear(struct kvm *kvm);
 383 void kvm_s390_gisa_destroy(struct kvm *kvm);
 384 int kvm_s390_gib_init(u8 nisc);
 385 void kvm_s390_gib_destroy(void);
 386
 387 /* implemented in guestdbg.c */
 388 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
 389 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
 390 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
 391 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 392                             struct kvm_guest_debug *dbg);
 393 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
 394 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
 395 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
 396 int kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
 397
 398 /* support for Basic/Extended SCA handling */
 399 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
 400 {
 401         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
 402
 403         return &sca->ipte_control;
 404 }
 405 static inline int kvm_s390_use_sca_entries(void)
 406 {
 407         /*
 408          * Without SIGP interpretation, only SRS interpretation (if available)
 409          * might use the entries. By not setting the entries and keeping them
 410          * invalid, hardware will not access them but intercept.
 411          */
 412         return sclp.has_sigpif;
 413 }
 414 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
 415                                      struct mcck_volatile_info *mcck_info);
 416
 417 /**
 418  * kvm_s390_vcpu_crypto_reset_all
 419  *
 420  * Reset the crypto attributes for each vcpu. This can be done while the vcpus
 421  * are running as each vcpu will be removed from SIE before resetting the crypt
 422  * attributes and restored to SIE afterward.
 423  *
 424  * Note: The kvm->lock must be held while calling this function
 425  *
 426  * @kvm: the KVM guest
 427  */
 428 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm);
 429 #endif