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 typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
  23
  24 /* Transactional Memory Execution related macros */
  25 #define IS_TE_ENABLED(vcpu)     ((vcpu->arch.sie_block->ecb & ECB_TE))
  26 #define TDB_FORMAT1             1
  27 #define IS_ITDB_VALID(vcpu)     ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
  28
  29 extern debug_info_t *kvm_s390_dbf;
  30 #define KVM_EVENT(d_loglevel, d_string, d_args...)\
  31 do { \
  32         debug_sprintf_event(kvm_s390_dbf, d_loglevel, d_string "\n", \
  33           d_args); \
  34 } while (0)
  35
  36 #define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
  37 do { \
  38         debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
  39           d_args); \
  40 } while (0)
  41
  42 #define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
  43 do { \
  44         debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
  45           "%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
  46           d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
  47           d_args); \
  48 } while (0)
  49
  50 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
  51 {
  52         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED;
  53 }
  54
  55 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
  56 {
  57         return test_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  58 }
  59
  60 static inline int kvm_is_ucontrol(struct kvm *kvm)
  61 {
  62 #ifdef CONFIG_KVM_S390_UCONTROL
  63         if (kvm->arch.gmap)
  64                 return 0;
  65         return 1;
  66 #else
  67         return 0;
  68 #endif
  69 }
  70
  71 #define GUEST_PREFIX_SHIFT 13
  72 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
  73 {
  74         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
  75 }
  76
  77 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
  78 {
  79         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
  80                    prefix);
  81         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
  82         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
  83         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
  84 }
  85
  86 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, u8 *ar)
  87 {
  88         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
  89         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
  90
  91         if (ar)
  92                 *ar = base2;
  93
  94         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
  95 }
  96
  97 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
  98                                               u64 *address1, u64 *address2,
  99                                               u8 *ar_b1, u8 *ar_b2)
 100 {
 101         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
 102         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
 103         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
 104         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
 105
 106         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
 107         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 108
 109         if (ar_b1)
 110                 *ar_b1 = base1;
 111         if (ar_b2)
 112                 *ar_b2 = base2;
 113 }
 114
 115 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 116 {
 117         if (r1)
 118                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
 119         if (r2)
 120                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 121 }
 122
 123 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, u8 *ar)
 124 {
 125         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 126         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
 127                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
 128         /* The displacement is a 20bit _SIGNED_ value */
 129         if (disp2 & 0x80000)
 130                 disp2+=0xfff00000;
 131
 132         if (ar)
 133                 *ar = base2;
 134
 135         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
 136 }
 137
 138 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, u8 *ar)
 139 {
 140         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 141         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 142
 143         if (ar)
 144                 *ar = base2;
 145
 146         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 147 }
 148
 149 /* Set the condition code in the guest program status word */
 150 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
 151 {
 152         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
 153         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
 154 }
 155
 156 /* test availability of facility in a kvm instance */
 157 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
 158 {
 159         return __test_facility(nr, kvm->arch.model.fac_mask) &&
 160                 __test_facility(nr, kvm->arch.model.fac_list);
 161 }
 162
 163 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
 164 {
 165         unsigned char *ptr;
 166
 167         if (nr >= MAX_FACILITY_BIT)
 168                 return -EINVAL;
 169         ptr = (unsigned char *) fac_list + (nr >> 3);
 170         *ptr |= (0x80UL >> (nr & 7));
 171         return 0;
 172 }
 173
 174 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
 175 {
 176         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
 177         return test_bit_inv(nr, kvm->arch.cpu_feat);
 178 }
 179
 180 /* are cpu states controlled by user space */
 181 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
 182 {
 183         return kvm->arch.user_cpu_state_ctrl != 0;
 184 }
 185
 186 /* implemented in interrupt.c */
 187 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
 188 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
 189 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 190 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 191 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 192 void kvm_s390_clear_float_irqs(struct kvm *kvm);
 193 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
 194                                     struct kvm_s390_interrupt *s390int);
 195 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 196                                       struct kvm_s390_irq *irq);
 197 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 198                                            struct kvm_s390_pgm_info *pgm_info)
 199 {
 200         struct kvm_s390_irq irq = {
 201                 .type = KVM_S390_PROGRAM_INT,
 202                 .u.pgm = *pgm_info,
 203         };
 204
 205         return kvm_s390_inject_vcpu(vcpu, &irq);
 206 }
 207 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 208 {
 209         struct kvm_s390_irq irq = {
 210                 .type = KVM_S390_PROGRAM_INT,
 211                 .u.pgm.code = code,
 212         };
 213
 214         return kvm_s390_inject_vcpu(vcpu, &irq);
 215 }
 216 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 217                                                     u64 isc_mask, u32 schid);
 218 int kvm_s390_reinject_io_int(struct kvm *kvm,
 219                              struct kvm_s390_interrupt_info *inti);
 220 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
 221
 222 /* implemented in intercept.c */
 223 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
 224 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
 225 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
 226 {
 227         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 228
 229         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
 230 }
 231 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
 232 {
 233         kvm_s390_rewind_psw(vcpu, -ilen);
 234 }
 235 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
 236 {
 237         /* don't inject PER events if we re-execute the instruction */
 238         vcpu->arch.sie_block->icptstatus &= ~0x02;
 239         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
 240 }
 241
 242 int handle_sthyi(struct kvm_vcpu *vcpu);
 243
 244 /* implemented in priv.c */
 245 int is_valid_psw(psw_t *psw);
 246 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);
 247 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
 248 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu);
 249 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
 250 int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
 251 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
 252 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
 253 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
 254 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
 255 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
 256 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu);
 257
 258 /* implemented in vsie.c */
 259 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu);
 260 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu);
 261 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
 262                                  unsigned long end);
 263 void kvm_s390_vsie_init(struct kvm *kvm);
 264 void kvm_s390_vsie_destroy(struct kvm *kvm);
 265
 266 /* implemented in sigp.c */
 267 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
 268 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
 269
 270 /* implemented in kvm-s390.c */
 271 void kvm_s390_set_tod_clock(struct kvm *kvm,
 272                             const struct kvm_s390_vm_tod_clock *gtod);
 273 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
 274 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
 275 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
 276 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
 277 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
 278 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
 279 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
 280 void exit_sie(struct kvm_vcpu *vcpu);
 281 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
 282 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
 283 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
 284 unsigned long kvm_s390_fac_list_mask_size(void);
 285 extern unsigned long kvm_s390_fac_list_mask[];
 286 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
 287 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
 288
 289 /* implemented in diag.c */
 290 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
 291
 292 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
 293 {
 294         int i;
 295         struct kvm_vcpu *vcpu;
 296
 297         WARN_ON(!mutex_is_locked(&kvm->lock));
 298         kvm_for_each_vcpu(i, vcpu, kvm)
 299                 kvm_s390_vcpu_block(vcpu);
 300 }
 301
 302 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
 303 {
 304         int i;
 305         struct kvm_vcpu *vcpu;
 306
 307         kvm_for_each_vcpu(i, vcpu, kvm)
 308                 kvm_s390_vcpu_unblock(vcpu);
 309 }
 310
 311 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
 312 {
 313         u64 rc;
 314
 315         preempt_disable();
 316         rc = get_tod_clock_fast() + kvm->arch.epoch;
 317         preempt_enable();
 318         return rc;
 319 }
 320
 321 /**
 322  * kvm_s390_inject_prog_cond - conditionally inject a program check
 323  * @vcpu: virtual cpu
 324  * @rc: original return/error code
 325  *
 326  * This function is supposed to be used after regular guest access functions
 327  * failed, to conditionally inject a program check to a vcpu. The typical
 328  * pattern would look like
 329  *
 330  * rc = write_guest(vcpu, addr, data, len);
 331  * if (rc)
 332  *      return kvm_s390_inject_prog_cond(vcpu, rc);
 333  *
 334  * A negative return code from guest access functions implies an internal error
 335  * like e.g. out of memory. In these cases no program check should be injected
 336  * to the guest.
 337  * A positive value implies that an exception happened while accessing a guest's
 338  * memory. In this case all data belonging to the corresponding program check
 339  * has been stored in vcpu->arch.pgm and can be injected with
 340  * kvm_s390_inject_prog_irq().
 341  *
 342  * Returns: - the original @rc value if @rc was negative (internal error)
 343  *          - zero if @rc was already zero
 344  *          - zero or error code from injecting if @rc was positive
 345  *            (program check injected to @vcpu)
 346  */
 347 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
 348 {
 349         if (rc <= 0)
 350                 return rc;
 351         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 352 }
 353
 354 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
 355                         struct kvm_s390_irq *s390irq);
 356
 357 /* implemented in interrupt.c */
 358 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
 359 int psw_extint_disabled(struct kvm_vcpu *vcpu);
 360 void kvm_s390_destroy_adapters(struct kvm *kvm);
 361 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 362 extern struct kvm_device_ops kvm_flic_ops;
 363 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
 364 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 365 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 366                            void __user *buf, int len);
 367 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 368                            __u8 __user *buf, int len);
 369
 370 /* implemented in guestdbg.c */
 371 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
 372 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
 373 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
 374 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 375                             struct kvm_guest_debug *dbg);
 376 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
 377 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
 378 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
 379 int kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
 380
 381 /* support for Basic/Extended SCA handling */
 382 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
 383 {
 384         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
 385
 386         return &sca->ipte_control;
 387 }
 388 static inline int kvm_s390_use_sca_entries(void)
 389 {
 390         /*
 391          * Without SIGP interpretation, only SRS interpretation (if available)
 392          * might use the entries. By not setting the entries and keeping them
 393          * invalid, hardware will not access them but intercept.
 394          */
 395         return sclp.has_sigpif;
 396 }
 397 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
 398                                      struct mcck_volatile_info *mcck_info);
 399 #endif