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
  24 typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
  25
  26 /* Transactional Memory Execution related macros */
  27 #define IS_TE_ENABLED(vcpu)     ((vcpu->arch.sie_block->ecb & 0x10))
  28 #define TDB_FORMAT1             1
  29 #define IS_ITDB_VALID(vcpu)     ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
  30
  31 extern debug_info_t *kvm_s390_dbf;
  32 #define KVM_EVENT(d_loglevel, d_string, d_args...)\
  33 do { \
  34         debug_sprintf_event(kvm_s390_dbf, d_loglevel, d_string "\n", \
  35           d_args); \
  36 } while (0)
  37
  38 #define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
  39 do { \
  40         debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
  41           d_args); \
  42 } while (0)
  43
  44 #define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
  45 do { \
  46         debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
  47           "%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
  48           d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
  49           d_args); \
  50 } while (0)
  51
  52 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
  53 {
  54         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED;
  55 }
  56
  57 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
  58 {
  59         return test_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
  60 }
  61
  62 static inline int kvm_is_ucontrol(struct kvm *kvm)
  63 {
  64 #ifdef CONFIG_KVM_S390_UCONTROL
  65         if (kvm->arch.gmap)
  66                 return 0;
  67         return 1;
  68 #else
  69         return 0;
  70 #endif
  71 }
  72
  73 #define GUEST_PREFIX_SHIFT 13
  74 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
  75 {
  76         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
  77 }
  78
  79 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
  80 {
  81         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
  82                    prefix);
  83         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
  84         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
  85         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
  86 }
  87
  88 typedef u8 __bitwise ar_t;
  89
  90 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, ar_t *ar)
  91 {
  92         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
  93         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
  94
  95         if (ar)
  96                 *ar = base2;
  97
  98         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
  99 }
 100
 101 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
 102                                               u64 *address1, u64 *address2,
 103                                               ar_t *ar_b1, ar_t *ar_b2)
 104 {
 105         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
 106         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
 107         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
 108         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
 109
 110         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
 111         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 112
 113         if (ar_b1)
 114                 *ar_b1 = base1;
 115         if (ar_b2)
 116                 *ar_b2 = base2;
 117 }
 118
 119 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 120 {
 121         if (r1)
 122                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
 123         if (r2)
 124                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 125 }
 126
 127 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, ar_t *ar)
 128 {
 129         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 130         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
 131                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
 132         /* The displacement is a 20bit _SIGNED_ value */
 133         if (disp2 & 0x80000)
 134                 disp2+=0xfff00000;
 135
 136         if (ar)
 137                 *ar = base2;
 138
 139         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
 140 }
 141
 142 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, ar_t *ar)
 143 {
 144         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 145         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 146
 147         if (ar)
 148                 *ar = base2;
 149
 150         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 151 }
 152
 153 /* Set the condition code in the guest program status word */
 154 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
 155 {
 156         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
 157         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
 158 }
 159
 160 /* test availability of facility in a kvm instance */
 161 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
 162 {
 163         return __test_facility(nr, kvm->arch.model.fac_mask) &&
 164                 __test_facility(nr, kvm->arch.model.fac_list);
 165 }
 166
 167 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
 168 {
 169         unsigned char *ptr;
 170
 171         if (nr >= MAX_FACILITY_BIT)
 172                 return -EINVAL;
 173         ptr = (unsigned char *) fac_list + (nr >> 3);
 174         *ptr |= (0x80UL >> (nr & 7));
 175         return 0;
 176 }
 177
 178 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
 179 {
 180         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
 181         return test_bit_inv(nr, kvm->arch.cpu_feat);
 182 }
 183
 184 /* are cpu states controlled by user space */
 185 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
 186 {
 187         return kvm->arch.user_cpu_state_ctrl != 0;
 188 }
 189
 190 /* implemented in interrupt.c */
 191 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
 192 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
 193 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 194 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 195 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 196 void kvm_s390_clear_float_irqs(struct kvm *kvm);
 197 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
 198                                     struct kvm_s390_interrupt *s390int);
 199 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 200                                       struct kvm_s390_irq *irq);
 201 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 202                                            struct kvm_s390_pgm_info *pgm_info)
 203 {
 204         struct kvm_s390_irq irq = {
 205                 .type = KVM_S390_PROGRAM_INT,
 206                 .u.pgm = *pgm_info,
 207         };
 208
 209         return kvm_s390_inject_vcpu(vcpu, &irq);
 210 }
 211 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 212 {
 213         struct kvm_s390_irq irq = {
 214                 .type = KVM_S390_PROGRAM_INT,
 215                 .u.pgm.code = code,
 216         };
 217
 218         return kvm_s390_inject_vcpu(vcpu, &irq);
 219 }
 220 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
 221                                                     u64 isc_mask, u32 schid);
 222 int kvm_s390_reinject_io_int(struct kvm *kvm,
 223                              struct kvm_s390_interrupt_info *inti);
 224 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
 225
 226 /* implemented in intercept.c */
 227 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
 228 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
 229 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
 230 {
 231         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 232
 233         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
 234 }
 235 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
 236 {
 237         kvm_s390_rewind_psw(vcpu, -ilen);
 238 }
 239 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
 240 {
 241         /* don't inject PER events if we re-execute the instruction */
 242         vcpu->arch.sie_block->icptstatus &= ~0x02;
 243         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
 244 }
 245
 246 /* implemented in priv.c */
 247 int is_valid_psw(psw_t *psw);
 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_store_adtl_status_unloaded(struct kvm_vcpu *vcpu,
 277                                         unsigned long addr);
 278 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
 279 int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr);
 280 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
 281 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
 282 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
 283 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
 284 void exit_sie(struct kvm_vcpu *vcpu);
 285 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
 286 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
 287 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
 288 unsigned long kvm_s390_fac_list_mask_size(void);
 289 extern unsigned long kvm_s390_fac_list_mask[];
 290 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
 291 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
 292
 293 /* implemented in diag.c */
 294 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
 295
 296 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
 297 {
 298         int i;
 299         struct kvm_vcpu *vcpu;
 300
 301         WARN_ON(!mutex_is_locked(&kvm->lock));
 302         kvm_for_each_vcpu(i, vcpu, kvm)
 303                 kvm_s390_vcpu_block(vcpu);
 304 }
 305
 306 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
 307 {
 308         int i;
 309         struct kvm_vcpu *vcpu;
 310
 311         kvm_for_each_vcpu(i, vcpu, kvm)
 312                 kvm_s390_vcpu_unblock(vcpu);
 313 }
 314
 315 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
 316 {
 317         u64 rc;
 318
 319         preempt_disable();
 320         rc = get_tod_clock_fast() + kvm->arch.epoch;
 321         preempt_enable();
 322         return rc;
 323 }
 324
 325 /**
 326  * kvm_s390_inject_prog_cond - conditionally inject a program check
 327  * @vcpu: virtual cpu
 328  * @rc: original return/error code
 329  *
 330  * This function is supposed to be used after regular guest access functions
 331  * failed, to conditionally inject a program check to a vcpu. The typical
 332  * pattern would look like
 333  *
 334  * rc = write_guest(vcpu, addr, data, len);
 335  * if (rc)
 336  *      return kvm_s390_inject_prog_cond(vcpu, rc);
 337  *
 338  * A negative return code from guest access functions implies an internal error
 339  * like e.g. out of memory. In these cases no program check should be injected
 340  * to the guest.
 341  * A positive value implies that an exception happened while accessing a guest's
 342  * memory. In this case all data belonging to the corresponding program check
 343  * has been stored in vcpu->arch.pgm and can be injected with
 344  * kvm_s390_inject_prog_irq().
 345  *
 346  * Returns: - the original @rc value if @rc was negative (internal error)
 347  *          - zero if @rc was already zero
 348  *          - zero or error code from injecting if @rc was positive
 349  *            (program check injected to @vcpu)
 350  */
 351 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
 352 {
 353         if (rc <= 0)
 354                 return rc;
 355         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 356 }
 357
 358 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
 359                         struct kvm_s390_irq *s390irq);
 360
 361 /* implemented in interrupt.c */
 362 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
 363 int psw_extint_disabled(struct kvm_vcpu *vcpu);
 364 void kvm_s390_destroy_adapters(struct kvm *kvm);
 365 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 366 extern struct kvm_device_ops kvm_flic_ops;
 367 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
 368 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 369 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 370                            void __user *buf, int len);
 371 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 372                            __u8 __user *buf, int len);
 373
 374 /* implemented in guestdbg.c */
 375 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
 376 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
 377 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
 378 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 379                             struct kvm_guest_debug *dbg);
 380 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
 381 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
 382 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
 383 void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
 384
 385 /* support for Basic/Extended SCA handling */
 386 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
 387 {
 388         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
 389
 390         return &sca->ipte_control;
 391 }
 392 #endif