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