arch/s390/kvm/kvm-s390.h

   1 /*
   2  * definition for kvm on s390
   3  *
   4  * Copyright IBM Corp. 2008, 2009
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  *               Christian Borntraeger <borntraeger@de.ibm.com>
  12  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
  13  */
  14
  15 #ifndef ARCH_S390_KVM_S390_H
  16 #define ARCH_S390_KVM_S390_H
  17
  18 #include <linux/hrtimer.h>
  19 #include <linux/kvm.h>
  20 #include <linux/kvm_host.h>
  21 #include <asm/facility.h>
  22 #include <asm/processor.h>
  23 #include <asm/sclp.h>
  24
  25 typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
  26
  27 /* Transactional Memory Execution related macros */
  28 #define IS_TE_ENABLED(vcpu)     ((vcpu->arch.sie_block->ecb & 0x10))
  29 #define TDB_FORMAT1             1
  30 #define IS_ITDB_VALID(vcpu)     ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
  31
  32 extern debug_info_t *kvm_s390_dbf;
  33 #define KVM_EVENT(d_loglevel, d_string, d_args...)\
  34 do { \
  35         debug_sprintf_event(kvm_s390_dbf, d_loglevel, d_string "\n", \
  36           d_args); \
  37 } while (0)
  38
  39 #define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
  40 do { \
  41         debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
  42           d_args); \
  43 } while (0)
  44
  45 #define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
  46 do { \
  47         debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
  48           "%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
  49           d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
  50           d_args); \
  51 } while (0)
  52
  53 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
  54 {
  55         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED;
  56 }
  57
  58 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
  59 {
  60         return test_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  61 }
  62
  63 static inline int kvm_is_ucontrol(struct kvm *kvm)
  64 {
  65 #ifdef CONFIG_KVM_S390_UCONTROL
  66         if (kvm->arch.gmap)
  67                 return 0;
  68         return 1;
  69 #else
  70         return 0;
  71 #endif
  72 }
  73
  74 #define GUEST_PREFIX_SHIFT 13
  75 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
  76 {
  77         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
  78 }
  79
  80 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
  81 {
  82         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
  83                    prefix);
  84         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
  85         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
  86         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
  87 }
  88
  89 typedef u8 __bitwise ar_t;
  90
  91 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, ar_t *ar)
  92 {
  93         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
  94         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
  95
  96         if (ar)
  97                 *ar = base2;
  98
  99         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 100 }
 101
 102 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
 103                                               u64 *address1, u64 *address2,
 104                                               ar_t *ar_b1, ar_t *ar_b2)
 105 {
 106         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
 107         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
 108         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
 109         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
 110
 111         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
 112         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 113
 114         if (ar_b1)
 115                 *ar_b1 = base1;
 116         if (ar_b2)
 117                 *ar_b2 = base2;
 118 }
 119
 120 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 121 {
 122         if (r1)
 123                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
 124         if (r2)
 125                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 126 }
 127
 128 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, ar_t *ar)
 129 {
 130         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 131         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
 132                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
 133         /* The displacement is a 20bit _SIGNED_ value */
 134         if (disp2 & 0x80000)
 135                 disp2+=0xfff00000;
 136
 137         if (ar)
 138                 *ar = base2;
 139
 140         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
 141 }
 142
 143 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, ar_t *ar)
 144 {
 145         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 146         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 147
 148         if (ar)
 149                 *ar = base2;
 150
 151         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 152 }
 153
 154 /* Set the condition code in the guest program status word */
 155 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
 156 {
 157         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
 158         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
 159 }
 160
 161 /* test availability of facility in a kvm instance */
 162 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
 163 {
 164         return __test_facility(nr, kvm->arch.model.fac_mask) &&
 165                 __test_facility(nr, kvm->arch.model.fac_list);
 166 }
 167
 168 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
 169 {
 170         unsigned char *ptr;
 171
 172         if (nr >= MAX_FACILITY_BIT)
 173                 return -EINVAL;
 174         ptr = (unsigned char *) fac_list + (nr >> 3);
 175         *ptr |= (0x80UL >> (nr & 7));
 176         return 0;
 177 }
 178
 179 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
 180 {
 181         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
 182         return test_bit_inv(nr, kvm->arch.cpu_feat);
 183 }
 184
 185 /* are cpu states controlled by user space */
 186 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
 187 {
 188         return kvm->arch.user_cpu_state_ctrl != 0;
 189 }
 190
 191 /* implemented in interrupt.c */
 192 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
 193 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
 194 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 195 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 196 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 197 void kvm_s390_clear_float_irqs(struct kvm *kvm);
 198 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
 199                                     struct kvm_s390_interrupt *s390int);
 200 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 201                                       struct kvm_s390_irq *irq);
 202 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 203                                            struct kvm_s390_pgm_info *pgm_info)
 204 {
 205         struct kvm_s390_irq irq = {
 206                 .type = KVM_S390_PROGRAM_INT,
 207                 .u.pgm = *pgm_info,
 208         };
 209
 210         return kvm_s390_inject_vcpu(vcpu, &irq);
 211 }
 212 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 213 {
 214         struct kvm_s390_irq irq = {
 215                 .type = KVM_S390_PROGRAM_INT,
 216                 .u.pgm.code = code,
 217         };
 218
 219         return kvm_s390_inject_vcpu(vcpu, &irq);
 220 }
 221 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 222                                                     u64 isc_mask, u32 schid);
 223 int kvm_s390_reinject_io_int(struct kvm *kvm,
 224                              struct kvm_s390_interrupt_info *inti);
 225 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
 226
 227 /* implemented in intercept.c */
 228 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
 229 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
 230 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
 231 {
 232         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 233
 234         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
 235 }
 236 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
 237 {
 238         kvm_s390_rewind_psw(vcpu, -ilen);
 239 }
 240 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
 241 {
 242         /* don't inject PER events if we re-execute the instruction */
 243         vcpu->arch.sie_block->icptstatus &= ~0x02;
 244         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
 245 }
 246
 247 /* implemented in priv.c */
 248 int is_valid_psw(psw_t *psw);
 249 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);
 250 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
 251 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
 252 int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
 253 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
 254 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
 255 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
 256 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
 257 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
 258
 259 /* implemented in vsie.c */
 260 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu);
 261 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu);
 262 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
 263                                  unsigned long end);
 264 void kvm_s390_vsie_init(struct kvm *kvm);
 265 void kvm_s390_vsie_destroy(struct kvm *kvm);
 266
 267 /* implemented in sigp.c */
 268 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
 269 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
 270
 271 /* implemented in sthyi.c */
 272 int handle_sthyi(struct kvm_vcpu *vcpu);
 273
 274 /* implemented in kvm-s390.c */
 275 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod);
 276 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
 277 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
 278 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
 279 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
 280 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
 281 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
 282 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
 283 void exit_sie(struct kvm_vcpu *vcpu);
 284 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
 285 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
 286 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
 287 unsigned long kvm_s390_fac_list_mask_size(void);
 288 extern unsigned long kvm_s390_fac_list_mask[];
 289 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
 290 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
 291
 292 /* implemented in diag.c */
 293 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
 294
 295 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
 296 {
 297         int i;
 298         struct kvm_vcpu *vcpu;
 299
 300         WARN_ON(!mutex_is_locked(&kvm->lock));
 301         kvm_for_each_vcpu(i, vcpu, kvm)
 302                 kvm_s390_vcpu_block(vcpu);
 303 }
 304
 305 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
 306 {
 307         int i;
 308         struct kvm_vcpu *vcpu;
 309
 310         kvm_for_each_vcpu(i, vcpu, kvm)
 311                 kvm_s390_vcpu_unblock(vcpu);
 312 }
 313
 314 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
 315 {
 316         u64 rc;
 317
 318         preempt_disable();
 319         rc = get_tod_clock_fast() + kvm->arch.epoch;
 320         preempt_enable();
 321         return rc;
 322 }
 323
 324 /**
 325  * kvm_s390_inject_prog_cond - conditionally inject a program check
 326  * @vcpu: virtual cpu
 327  * @rc: original return/error code
 328  *
 329  * This function is supposed to be used after regular guest access functions
 330  * failed, to conditionally inject a program check to a vcpu. The typical
 331  * pattern would look like
 332  *
 333  * rc = write_guest(vcpu, addr, data, len);
 334  * if (rc)
 335  *      return kvm_s390_inject_prog_cond(vcpu, rc);
 336  *
 337  * A negative return code from guest access functions implies an internal error
 338  * like e.g. out of memory. In these cases no program check should be injected
 339  * to the guest.
 340  * A positive value implies that an exception happened while accessing a guest's
 341  * memory. In this case all data belonging to the corresponding program check
 342  * has been stored in vcpu->arch.pgm and can be injected with
 343  * kvm_s390_inject_prog_irq().
 344  *
 345  * Returns: - the original @rc value if @rc was negative (internal error)
 346  *          - zero if @rc was already zero
 347  *          - zero or error code from injecting if @rc was positive
 348  *            (program check injected to @vcpu)
 349  */
 350 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
 351 {
 352         if (rc <= 0)
 353                 return rc;
 354         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 355 }
 356
 357 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
 358                         struct kvm_s390_irq *s390irq);
 359
 360 /* implemented in interrupt.c */
 361 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
 362 int psw_extint_disabled(struct kvm_vcpu *vcpu);
 363 void kvm_s390_destroy_adapters(struct kvm *kvm);
 364 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 365 extern struct kvm_device_ops kvm_flic_ops;
 366 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
 367 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 368 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 369                            void __user *buf, int len);
 370 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 371                            __u8 __user *buf, int len);
 372
 373 /* implemented in guestdbg.c */
 374 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
 375 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
 376 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
 377 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 378                             struct kvm_guest_debug *dbg);
 379 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
 380 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
 381 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
 382 void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
 383
 384 /* support for Basic/Extended SCA handling */
 385 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
 386 {
 387         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
 388
 389         return &sca->ipte_control;
 390 }
 391 static inline int kvm_s390_use_sca_entries(void)
 392 {
 393         /*
 394          * Without SIGP interpretation, only SRS interpretation (if available)
 395          * might use the entries. By not setting the entries and keeping them
 396          * invalid, hardware will not access them but intercept.
 397          */
 398         return sclp.has_sigpif;
 399 }
 400 #endif