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 void kvm_s390_set_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  51 {
  52         atomic_or(flags, &vcpu->arch.sie_block->cpuflags);
  53 }
  54
  55 static inline void kvm_s390_clear_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  56 {
  57         atomic_andnot(flags, &vcpu->arch.sie_block->cpuflags);
  58 }
  59
  60 static inline bool kvm_s390_test_cpuflags(struct kvm_vcpu *vcpu, u32 flags)
  61 {
  62         return (atomic_read(&vcpu->arch.sie_block->cpuflags) & flags) == flags;
  63 }
  64
  65 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
  66 {
  67         return kvm_s390_test_cpuflags(vcpu, CPUSTAT_STOPPED);
  68 }
  69
  70 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
  71 {
  72         return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.float_int.idle_mask);
  73 }
  74
  75 static inline int kvm_is_ucontrol(struct kvm *kvm)
  76 {
  77 #ifdef CONFIG_KVM_S390_UCONTROL
  78         if (kvm->arch.gmap)
  79                 return 0;
  80         return 1;
  81 #else
  82         return 0;
  83 #endif
  84 }
  85
  86 #define GUEST_PREFIX_SHIFT 13
  87 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
  88 {
  89         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
  90 }
  91
  92 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
  93 {
  94         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
  95                    prefix);
  96         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
  97         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
  98         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
  99 }
 100
 101 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, u8 *ar)
 102 {
 103         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 104         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 105
 106         if (ar)
 107                 *ar = base2;
 108
 109         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 110 }
 111
 112 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
 113                                               u64 *address1, u64 *address2,
 114                                               u8 *ar_b1, u8 *ar_b2)
 115 {
 116         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
 117         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
 118         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
 119         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
 120
 121         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
 122         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 123
 124         if (ar_b1)
 125                 *ar_b1 = base1;
 126         if (ar_b2)
 127                 *ar_b2 = base2;
 128 }
 129
 130 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 131 {
 132         if (r1)
 133                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
 134         if (r2)
 135                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 136 }
 137
 138 static inline u64 kvm_s390_get_base_disp_rsy(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                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
 143         /* The displacement is a 20bit _SIGNED_ value */
 144         if (disp2 & 0x80000)
 145                 disp2+=0xfff00000;
 146
 147         if (ar)
 148                 *ar = base2;
 149
 150         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
 151 }
 152
 153 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, u8 *ar)
 154 {
 155         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 156         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 157
 158         if (ar)
 159                 *ar = base2;
 160
 161         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 162 }
 163
 164 /* Set the condition code in the guest program status word */
 165 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
 166 {
 167         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
 168         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
 169 }
 170
 171 /* test availability of facility in a kvm instance */
 172 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
 173 {
 174         return __test_facility(nr, kvm->arch.model.fac_mask) &&
 175                 __test_facility(nr, kvm->arch.model.fac_list);
 176 }
 177
 178 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
 179 {
 180         unsigned char *ptr;
 181
 182         if (nr >= MAX_FACILITY_BIT)
 183                 return -EINVAL;
 184         ptr = (unsigned char *) fac_list + (nr >> 3);
 185         *ptr |= (0x80UL >> (nr & 7));
 186         return 0;
 187 }
 188
 189 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
 190 {
 191         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
 192         return test_bit_inv(nr, kvm->arch.cpu_feat);
 193 }
 194
 195 /* are cpu states controlled by user space */
 196 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
 197 {
 198         return kvm->arch.user_cpu_state_ctrl != 0;
 199 }
 200
 201 /* implemented in interrupt.c */
 202 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
 203 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
 204 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 205 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 206 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 207 void kvm_s390_clear_float_irqs(struct kvm *kvm);
 208 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
 209                                     struct kvm_s390_interrupt *s390int);
 210 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 211                                       struct kvm_s390_irq *irq);
 212 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 213                                            struct kvm_s390_pgm_info *pgm_info)
 214 {
 215         struct kvm_s390_irq irq = {
 216                 .type = KVM_S390_PROGRAM_INT,
 217                 .u.pgm = *pgm_info,
 218         };
 219
 220         return kvm_s390_inject_vcpu(vcpu, &irq);
 221 }
 222 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 223 {
 224         struct kvm_s390_irq irq = {
 225                 .type = KVM_S390_PROGRAM_INT,
 226                 .u.pgm.code = code,
 227         };
 228
 229         return kvm_s390_inject_vcpu(vcpu, &irq);
 230 }
 231 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 232                                                     u64 isc_mask, u32 schid);
 233 int kvm_s390_reinject_io_int(struct kvm *kvm,
 234                              struct kvm_s390_interrupt_info *inti);
 235 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
 236
 237 /* implemented in intercept.c */
 238 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
 239 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
 240 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
 241 {
 242         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 243
 244         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
 245 }
 246 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
 247 {
 248         kvm_s390_rewind_psw(vcpu, -ilen);
 249 }
 250 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
 251 {
 252         /* don't inject PER events if we re-execute the instruction */
 253         vcpu->arch.sie_block->icptstatus &= ~0x02;
 254         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
 255 }
 256
 257 int handle_sthyi(struct kvm_vcpu *vcpu);
 258
 259 /* implemented in priv.c */
 260 int is_valid_psw(psw_t *psw);
 261 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);
 262 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
 263 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu);
 264 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
 265 int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
 266 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
 267 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
 268 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
 269 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
 270 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
 271 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu);
 272
 273 /* implemented in vsie.c */
 274 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu);
 275 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu);
 276 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
 277                                  unsigned long end);
 278 void kvm_s390_vsie_init(struct kvm *kvm);
 279 void kvm_s390_vsie_destroy(struct kvm *kvm);
 280
 281 /* implemented in sigp.c */
 282 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
 283 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
 284
 285 /* implemented in kvm-s390.c */
 286 void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
 287                                  const struct kvm_s390_vm_tod_clock *gtod);
 288 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod);
 289 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
 290 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
 291 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
 292 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
 293 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
 294 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
 295 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
 296 void exit_sie(struct kvm_vcpu *vcpu);
 297 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
 298 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
 299 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
 300 unsigned long kvm_s390_fac_list_mask_size(void);
 301 extern unsigned long kvm_s390_fac_list_mask[];
 302 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
 303 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
 304
 305 /* implemented in diag.c */
 306 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
 307
 308 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
 309 {
 310         int i;
 311         struct kvm_vcpu *vcpu;
 312
 313         WARN_ON(!mutex_is_locked(&kvm->lock));
 314         kvm_for_each_vcpu(i, vcpu, kvm)
 315                 kvm_s390_vcpu_block(vcpu);
 316 }
 317
 318 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
 319 {
 320         int i;
 321         struct kvm_vcpu *vcpu;
 322
 323         kvm_for_each_vcpu(i, vcpu, kvm)
 324                 kvm_s390_vcpu_unblock(vcpu);
 325 }
 326
 327 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
 328 {
 329         u64 rc;
 330
 331         preempt_disable();
 332         rc = get_tod_clock_fast() + kvm->arch.epoch;
 333         preempt_enable();
 334         return rc;
 335 }
 336
 337 /**
 338  * kvm_s390_inject_prog_cond - conditionally inject a program check
 339  * @vcpu: virtual cpu
 340  * @rc: original return/error code
 341  *
 342  * This function is supposed to be used after regular guest access functions
 343  * failed, to conditionally inject a program check to a vcpu. The typical
 344  * pattern would look like
 345  *
 346  * rc = write_guest(vcpu, addr, data, len);
 347  * if (rc)
 348  *      return kvm_s390_inject_prog_cond(vcpu, rc);
 349  *
 350  * A negative return code from guest access functions implies an internal error
 351  * like e.g. out of memory. In these cases no program check should be injected
 352  * to the guest.
 353  * A positive value implies that an exception happened while accessing a guest's
 354  * memory. In this case all data belonging to the corresponding program check
 355  * has been stored in vcpu->arch.pgm and can be injected with
 356  * kvm_s390_inject_prog_irq().
 357  *
 358  * Returns: - the original @rc value if @rc was negative (internal error)
 359  *          - zero if @rc was already zero
 360  *          - zero or error code from injecting if @rc was positive
 361  *            (program check injected to @vcpu)
 362  */
 363 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
 364 {
 365         if (rc <= 0)
 366                 return rc;
 367         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 368 }
 369
 370 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
 371                         struct kvm_s390_irq *s390irq);
 372
 373 /* implemented in interrupt.c */
 374 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
 375 int psw_extint_disabled(struct kvm_vcpu *vcpu);
 376 void kvm_s390_destroy_adapters(struct kvm *kvm);
 377 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 378 extern struct kvm_device_ops kvm_flic_ops;
 379 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
 380 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 381 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 382                            void __user *buf, int len);
 383 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 384                            __u8 __user *buf, int len);
 385 void kvm_s390_gisa_init(struct kvm *kvm);
 386 void kvm_s390_gisa_clear(struct kvm *kvm);
 387 void kvm_s390_gisa_destroy(struct kvm *kvm);
 388
 389 /* implemented in guestdbg.c */
 390 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
 391 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
 392 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
 393 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 394                             struct kvm_guest_debug *dbg);
 395 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
 396 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
 397 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
 398 int kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
 399
 400 /* support for Basic/Extended SCA handling */
 401 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
 402 {
 403         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
 404
 405         return &sca->ipte_control;
 406 }
 407 static inline int kvm_s390_use_sca_entries(void)
 408 {
 409         /*
 410          * Without SIGP interpretation, only SRS interpretation (if available)
 411          * might use the entries. By not setting the entries and keeping them
 412          * invalid, hardware will not access them but intercept.
 413          */
 414         return sclp.has_sigpif;
 415 }
 416 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
 417                                      struct mcck_volatile_info *mcck_info);
 418 #endif