arch/s390/kvm/priv.c

   1 /*
   2  * handling privileged instructions
   3  *
   4  * Copyright IBM Corp. 2008, 2013
   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  */
  13
  14 #include <linux/kvm.h>
  15 #include <linux/gfp.h>
  16 #include <linux/errno.h>
  17 #include <linux/compat.h>
  18 #include <asm/asm-offsets.h>
  19 #include <asm/facility.h>
  20 #include <asm/current.h>
  21 #include <asm/debug.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/sysinfo.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/io.h>
  27 #include <asm/ptrace.h>
  28 #include <asm/compat.h>
  29 #include "gaccess.h"
  30 #include "kvm-s390.h"
  31 #include "trace.h"
  32
  33 /* Handle SCK (SET CLOCK) interception */
  34 static int handle_set_clock(struct kvm_vcpu *vcpu)
  35 {
  36         struct kvm_vcpu *cpup;
  37         s64 hostclk, val;
  38         u64 op2;
  39         int i;
  40
  41         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  42                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  43
  44         op2 = kvm_s390_get_base_disp_s(vcpu);
  45         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  46                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  47         if (get_guest(vcpu, val, (u64 __user *) op2))
  48                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  49
  50         if (store_tod_clock(&hostclk)) {
  51                 kvm_s390_set_psw_cc(vcpu, 3);
  52                 return 0;
  53         }
  54         val = (val - hostclk) & ~0x3fUL;
  55
  56         mutex_lock(&vcpu->kvm->lock);
  57         kvm_for_each_vcpu(i, cpup, vcpu->kvm)
  58                 cpup->arch.sie_block->epoch = val;
  59         mutex_unlock(&vcpu->kvm->lock);
  60
  61         kvm_s390_set_psw_cc(vcpu, 0);
  62         return 0;
  63 }
  64
  65 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  66 {
  67         u64 operand2;
  68         u32 address = 0;
  69         u8 tmp;
  70
  71         vcpu->stat.instruction_spx++;
  72
  73         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  74                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  75
  76         operand2 = kvm_s390_get_base_disp_s(vcpu);
  77
  78         /* must be word boundary */
  79         if (operand2 & 3)
  80                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  81
  82         /* get the value */
  83         if (get_guest(vcpu, address, (u32 __user *) operand2))
  84                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  85
  86         address = address & 0x7fffe000u;
  87
  88         /* make sure that the new value is valid memory */
  89         if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
  90            (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
  91                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  92
  93         kvm_s390_set_prefix(vcpu, address);
  94
  95         VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
  96         trace_kvm_s390_handle_prefix(vcpu, 1, address);
  97         return 0;
  98 }
  99
 100 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 101 {
 102         u64 operand2;
 103         u32 address;
 104
 105         vcpu->stat.instruction_stpx++;
 106
 107         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 108                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 109
 110         operand2 = kvm_s390_get_base_disp_s(vcpu);
 111
 112         /* must be word boundary */
 113         if (operand2 & 3)
 114                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 115
 116         address = vcpu->arch.sie_block->prefix;
 117         address = address & 0x7fffe000u;
 118
 119         /* get the value */
 120         if (put_guest(vcpu, address, (u32 __user *)operand2))
 121                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 122
 123         VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
 124         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 125         return 0;
 126 }
 127
 128 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 129 {
 130         u64 useraddr;
 131
 132         vcpu->stat.instruction_stap++;
 133
 134         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 135                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 136
 137         useraddr = kvm_s390_get_base_disp_s(vcpu);
 138
 139         if (useraddr & 1)
 140                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 141
 142         if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr))
 143                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 144
 145         VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
 146         trace_kvm_s390_handle_stap(vcpu, useraddr);
 147         return 0;
 148 }
 149
 150 static int handle_skey(struct kvm_vcpu *vcpu)
 151 {
 152         vcpu->stat.instruction_storage_key++;
 153
 154         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 155                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 156
 157         vcpu->arch.sie_block->gpsw.addr =
 158                 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
 159         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 160         return 0;
 161 }
 162
 163 static int handle_test_block(struct kvm_vcpu *vcpu)
 164 {
 165         unsigned long hva;
 166         gpa_t addr;
 167         int reg2;
 168
 169         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 170                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 171
 172         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 173         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 174         addr = kvm_s390_real_to_abs(vcpu, addr);
 175
 176         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
 177         if (kvm_is_error_hva(hva))
 178                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 179         /*
 180          * We don't expect errors on modern systems, and do not care
 181          * about storage keys (yet), so let's just clear the page.
 182          */
 183         if (clear_user((void __user *)hva, PAGE_SIZE) != 0)
 184                 return -EFAULT;
 185         kvm_s390_set_psw_cc(vcpu, 0);
 186         vcpu->run->s.regs.gprs[0] = 0;
 187         return 0;
 188 }
 189
 190 static int handle_tpi(struct kvm_vcpu *vcpu)
 191 {
 192         struct kvm_s390_interrupt_info *inti;
 193         u64 addr;
 194         int cc;
 195
 196         addr = kvm_s390_get_base_disp_s(vcpu);
 197         if (addr & 3)
 198                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 199         cc = 0;
 200         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 201         if (!inti)
 202                 goto no_interrupt;
 203         cc = 1;
 204         if (addr) {
 205                 /*
 206                  * Store the two-word I/O interruption code into the
 207                  * provided area.
 208                  */
 209                 if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr)
 210                     || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2))
 211                     || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4)))
 212                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 213         } else {
 214                 /*
 215                  * Store the three-word I/O interruption code into
 216                  * the appropriate lowcore area.
 217                  */
 218                 put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID);
 219                 put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR);
 220                 put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM);
 221                 put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD);
 222         }
 223         kfree(inti);
 224 no_interrupt:
 225         /* Set condition code and we're done. */
 226         kvm_s390_set_psw_cc(vcpu, cc);
 227         return 0;
 228 }
 229
 230 static int handle_tsch(struct kvm_vcpu *vcpu)
 231 {
 232         struct kvm_s390_interrupt_info *inti;
 233
 234         inti = kvm_s390_get_io_int(vcpu->kvm, 0,
 235                                    vcpu->run->s.regs.gprs[1]);
 236
 237         /*
 238          * Prepare exit to userspace.
 239          * We indicate whether we dequeued a pending I/O interrupt
 240          * so that userspace can re-inject it if the instruction gets
 241          * a program check. While this may re-order the pending I/O
 242          * interrupts, this is no problem since the priority is kept
 243          * intact.
 244          */
 245         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 246         vcpu->run->s390_tsch.dequeued = !!inti;
 247         if (inti) {
 248                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 249                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 250                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 251                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 252         }
 253         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 254         kfree(inti);
 255         return -EREMOTE;
 256 }
 257
 258 static int handle_io_inst(struct kvm_vcpu *vcpu)
 259 {
 260         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 261
 262         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 263                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 264
 265         if (vcpu->kvm->arch.css_support) {
 266                 /*
 267                  * Most I/O instructions will be handled by userspace.
 268                  * Exceptions are tpi and the interrupt portion of tsch.
 269                  */
 270                 if (vcpu->arch.sie_block->ipa == 0xb236)
 271                         return handle_tpi(vcpu);
 272                 if (vcpu->arch.sie_block->ipa == 0xb235)
 273                         return handle_tsch(vcpu);
 274                 /* Handle in userspace. */
 275                 return -EOPNOTSUPP;
 276         } else {
 277                 /*
 278                  * Set condition code 3 to stop the guest from issuing channel
 279                  * I/O instructions.
 280                  */
 281                 kvm_s390_set_psw_cc(vcpu, 3);
 282                 return 0;
 283         }
 284 }
 285
 286 static int handle_stfl(struct kvm_vcpu *vcpu)
 287 {
 288         int rc;
 289
 290         vcpu->stat.instruction_stfl++;
 291
 292         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 293                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 294
 295         rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 296                            vfacilities, 4);
 297         if (rc)
 298                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 299         VCPU_EVENT(vcpu, 5, "store facility list value %x",
 300                    *(unsigned int *) vfacilities);
 301         trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
 302         return 0;
 303 }
 304
 305 static void handle_new_psw(struct kvm_vcpu *vcpu)
 306 {
 307         /* Check whether the new psw is enabled for machine checks. */
 308         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
 309                 kvm_s390_deliver_pending_machine_checks(vcpu);
 310 }
 311
 312 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 313 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 314 #define PSW_ADDR_24 0x0000000000ffffffUL
 315 #define PSW_ADDR_31 0x000000007fffffffUL
 316
 317 static int is_valid_psw(psw_t *psw) {
 318         if (psw->mask & PSW_MASK_UNASSIGNED)
 319                 return 0;
 320         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 321                 if (psw->addr & ~PSW_ADDR_31)
 322                         return 0;
 323         }
 324         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 325                 return 0;
 326         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 327                 return 0;
 328         return 1;
 329 }
 330
 331 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 332 {
 333         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 334         psw_compat_t new_psw;
 335         u64 addr;
 336
 337         if (gpsw->mask & PSW_MASK_PSTATE)
 338                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 339
 340         addr = kvm_s390_get_base_disp_s(vcpu);
 341         if (addr & 7)
 342                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 343         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 344                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 345         if (!(new_psw.mask & PSW32_MASK_BASE))
 346                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 347         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 348         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 349         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 350         if (!is_valid_psw(gpsw))
 351                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 352         handle_new_psw(vcpu);
 353         return 0;
 354 }
 355
 356 static int handle_lpswe(struct kvm_vcpu *vcpu)
 357 {
 358         psw_t new_psw;
 359         u64 addr;
 360
 361         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 362                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 363
 364         addr = kvm_s390_get_base_disp_s(vcpu);
 365         if (addr & 7)
 366                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 367         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 368                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 369         vcpu->arch.sie_block->gpsw = new_psw;
 370         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 371                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 372         handle_new_psw(vcpu);
 373         return 0;
 374 }
 375
 376 static int handle_stidp(struct kvm_vcpu *vcpu)
 377 {
 378         u64 operand2;
 379
 380         vcpu->stat.instruction_stidp++;
 381
 382         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 383                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 384
 385         operand2 = kvm_s390_get_base_disp_s(vcpu);
 386
 387         if (operand2 & 7)
 388                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 389
 390         if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
 391                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 392
 393         VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
 394         return 0;
 395 }
 396
 397 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 398 {
 399         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 400         int cpus = 0;
 401         int n;
 402
 403         spin_lock(&fi->lock);
 404         for (n = 0; n < KVM_MAX_VCPUS; n++)
 405                 if (fi->local_int[n])
 406                         cpus++;
 407         spin_unlock(&fi->lock);
 408
 409         /* deal with other level 3 hypervisors */
 410         if (stsi(mem, 3, 2, 2))
 411                 mem->count = 0;
 412         if (mem->count < 8)
 413                 mem->count++;
 414         for (n = mem->count - 1; n > 0 ; n--)
 415                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 416
 417         mem->vm[0].cpus_total = cpus;
 418         mem->vm[0].cpus_configured = cpus;
 419         mem->vm[0].cpus_standby = 0;
 420         mem->vm[0].cpus_reserved = 0;
 421         mem->vm[0].caf = 1000;
 422         memcpy(mem->vm[0].name, "KVMguest", 8);
 423         ASCEBC(mem->vm[0].name, 8);
 424         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 425         ASCEBC(mem->vm[0].cpi, 16);
 426 }
 427
 428 static int handle_stsi(struct kvm_vcpu *vcpu)
 429 {
 430         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 431         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 432         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 433         unsigned long mem = 0;
 434         u64 operand2;
 435         int rc = 0;
 436
 437         vcpu->stat.instruction_stsi++;
 438         VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
 439
 440         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 441                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 442
 443         if (fc > 3) {
 444                 kvm_s390_set_psw_cc(vcpu, 3);
 445                 return 0;
 446         }
 447
 448         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 449             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 450                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 451
 452         if (fc == 0) {
 453                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 454                 kvm_s390_set_psw_cc(vcpu, 0);
 455                 return 0;
 456         }
 457
 458         operand2 = kvm_s390_get_base_disp_s(vcpu);
 459
 460         if (operand2 & 0xfff)
 461                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 462
 463         switch (fc) {
 464         case 1: /* same handling for 1 and 2 */
 465         case 2:
 466                 mem = get_zeroed_page(GFP_KERNEL);
 467                 if (!mem)
 468                         goto out_no_data;
 469                 if (stsi((void *) mem, fc, sel1, sel2))
 470                         goto out_no_data;
 471                 break;
 472         case 3:
 473                 if (sel1 != 2 || sel2 != 2)
 474                         goto out_no_data;
 475                 mem = get_zeroed_page(GFP_KERNEL);
 476                 if (!mem)
 477                         goto out_no_data;
 478                 handle_stsi_3_2_2(vcpu, (void *) mem);
 479                 break;
 480         }
 481
 482         if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
 483                 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 484                 goto out_exception;
 485         }
 486         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 487         free_page(mem);
 488         kvm_s390_set_psw_cc(vcpu, 0);
 489         vcpu->run->s.regs.gprs[0] = 0;
 490         return 0;
 491 out_no_data:
 492         kvm_s390_set_psw_cc(vcpu, 3);
 493 out_exception:
 494         free_page(mem);
 495         return rc;
 496 }
 497
 498 static const intercept_handler_t b2_handlers[256] = {
 499         [0x02] = handle_stidp,
 500         [0x04] = handle_set_clock,
 501         [0x10] = handle_set_prefix,
 502         [0x11] = handle_store_prefix,
 503         [0x12] = handle_store_cpu_address,
 504         [0x29] = handle_skey,
 505         [0x2a] = handle_skey,
 506         [0x2b] = handle_skey,
 507         [0x2c] = handle_test_block,
 508         [0x30] = handle_io_inst,
 509         [0x31] = handle_io_inst,
 510         [0x32] = handle_io_inst,
 511         [0x33] = handle_io_inst,
 512         [0x34] = handle_io_inst,
 513         [0x35] = handle_io_inst,
 514         [0x36] = handle_io_inst,
 515         [0x37] = handle_io_inst,
 516         [0x38] = handle_io_inst,
 517         [0x39] = handle_io_inst,
 518         [0x3a] = handle_io_inst,
 519         [0x3b] = handle_io_inst,
 520         [0x3c] = handle_io_inst,
 521         [0x5f] = handle_io_inst,
 522         [0x74] = handle_io_inst,
 523         [0x76] = handle_io_inst,
 524         [0x7d] = handle_stsi,
 525         [0xb1] = handle_stfl,
 526         [0xb2] = handle_lpswe,
 527 };
 528
 529 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 530 {
 531         intercept_handler_t handler;
 532
 533         /*
 534          * A lot of B2 instructions are priviledged. Here we check for
 535          * the privileged ones, that we can handle in the kernel.
 536          * Anything else goes to userspace.
 537          */
 538         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 539         if (handler)
 540                 return handler(vcpu);
 541
 542         return -EOPNOTSUPP;
 543 }
 544
 545 static int handle_epsw(struct kvm_vcpu *vcpu)
 546 {
 547         int reg1, reg2;
 548
 549         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 550
 551         /* This basically extracts the mask half of the psw. */
 552         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 553         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 554         if (reg2) {
 555                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 556                 vcpu->run->s.regs.gprs[reg2] |=
 557                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 558         }
 559         return 0;
 560 }
 561
 562 #define PFMF_RESERVED   0xfffc0101UL
 563 #define PFMF_SK         0x00020000UL
 564 #define PFMF_CF         0x00010000UL
 565 #define PFMF_UI         0x00008000UL
 566 #define PFMF_FSC        0x00007000UL
 567 #define PFMF_NQ         0x00000800UL
 568 #define PFMF_MR         0x00000400UL
 569 #define PFMF_MC         0x00000200UL
 570 #define PFMF_KEY        0x000000feUL
 571
 572 static int handle_pfmf(struct kvm_vcpu *vcpu)
 573 {
 574         int reg1, reg2;
 575         unsigned long start, end;
 576
 577         vcpu->stat.instruction_pfmf++;
 578
 579         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 580
 581         if (!MACHINE_HAS_PFMF)
 582                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 583
 584         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 585                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 586
 587         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 588                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 589
 590         /* Only provide non-quiescing support if the host supports it */
 591         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
 592                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 593
 594         /* No support for conditional-SSKE */
 595         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
 596                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 597
 598         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 599         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 600         case 0x00000000:
 601                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 602                 break;
 603         case 0x00001000:
 604                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 605                 break;
 606         /* We dont support EDAT2
 607         case 0x00002000:
 608                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 609                 break;*/
 610         default:
 611                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 612         }
 613         while (start < end) {
 614                 unsigned long useraddr;
 615
 616                 useraddr = gmap_translate(start, vcpu->arch.gmap);
 617                 if (IS_ERR((void *)useraddr))
 618                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 619
 620                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 621                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 622                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 623                 }
 624
 625                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 626                         if (set_guest_storage_key(current->mm, useraddr,
 627                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
 628                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
 629                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 630                 }
 631
 632                 start += PAGE_SIZE;
 633         }
 634         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
 635                 vcpu->run->s.regs.gprs[reg2] = end;
 636         return 0;
 637 }
 638
 639 static int handle_essa(struct kvm_vcpu *vcpu)
 640 {
 641         /* entries expected to be 1FF */
 642         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 643         unsigned long *cbrlo, cbrle;
 644         struct gmap *gmap;
 645         int i;
 646
 647         VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
 648         gmap = vcpu->arch.gmap;
 649         vcpu->stat.instruction_essa++;
 650         if (!kvm_enabled_cmma() || !vcpu->arch.sie_block->cbrlo)
 651                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 652
 653         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 654                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 655
 656         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
 657                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 658
 659         /* Rewind PSW to repeat the ESSA instruction */
 660         vcpu->arch.sie_block->gpsw.addr =
 661                 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
 662         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
 663         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
 664         down_read(&gmap->mm->mmap_sem);
 665         for (i = 0; i < entries; ++i) {
 666                 cbrle = cbrlo[i];
 667                 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
 668                         /* invalid entry */
 669                         break;
 670                 /* try to free backing */
 671                 __gmap_zap(cbrle, gmap);
 672         }
 673         up_read(&gmap->mm->mmap_sem);
 674         if (i < entries)
 675                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 676         return 0;
 677 }
 678
 679 static const intercept_handler_t b9_handlers[256] = {
 680         [0x8d] = handle_epsw,
 681         [0xab] = handle_essa,
 682         [0xaf] = handle_pfmf,
 683 };
 684
 685 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 686 {
 687         intercept_handler_t handler;
 688
 689         /* This is handled just as for the B2 instructions. */
 690         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 691         if (handler)
 692                 return handler(vcpu);
 693
 694         return -EOPNOTSUPP;
 695 }
 696
 697 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 698 {
 699         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 700         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 701         u64 useraddr;
 702         u32 val = 0;
 703         int reg, rc;
 704
 705         vcpu->stat.instruction_lctl++;
 706
 707         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 708                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 709
 710         useraddr = kvm_s390_get_base_disp_rs(vcpu);
 711
 712         if (useraddr & 3)
 713                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 714
 715         VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
 716                    useraddr);
 717         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
 718
 719         reg = reg1;
 720         do {
 721                 rc = get_guest(vcpu, val, (u32 __user *) useraddr);
 722                 if (rc)
 723                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 724                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 725                 vcpu->arch.sie_block->gcr[reg] |= val;
 726                 useraddr += 4;
 727                 if (reg == reg3)
 728                         break;
 729                 reg = (reg + 1) % 16;
 730         } while (1);
 731
 732         return 0;
 733 }
 734
 735 static int handle_lctlg(struct kvm_vcpu *vcpu)
 736 {
 737         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 738         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 739         u64 useraddr;
 740         int reg, rc;
 741
 742         vcpu->stat.instruction_lctlg++;
 743
 744         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 745                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 746
 747         useraddr = kvm_s390_get_base_disp_rsy(vcpu);
 748
 749         if (useraddr & 7)
 750                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 751
 752         reg = reg1;
 753
 754         VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
 755                    useraddr);
 756         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
 757
 758         do {
 759                 rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg],
 760                                (u64 __user *) useraddr);
 761                 if (rc)
 762                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 763                 useraddr += 8;
 764                 if (reg == reg3)
 765                         break;
 766                 reg = (reg + 1) % 16;
 767         } while (1);
 768
 769         return 0;
 770 }
 771
 772 static const intercept_handler_t eb_handlers[256] = {
 773         [0x2f] = handle_lctlg,
 774 };
 775
 776 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
 777 {
 778         intercept_handler_t handler;
 779
 780         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 781         if (handler)
 782                 return handler(vcpu);
 783         return -EOPNOTSUPP;
 784 }
 785
 786 static int handle_tprot(struct kvm_vcpu *vcpu)
 787 {
 788         u64 address1, address2;
 789         struct vm_area_struct *vma;
 790         unsigned long user_address;
 791
 792         vcpu->stat.instruction_tprot++;
 793
 794         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 795                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 796
 797         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
 798
 799         /* we only handle the Linux memory detection case:
 800          * access key == 0
 801          * guest DAT == off
 802          * everything else goes to userspace. */
 803         if (address2 & 0xf0)
 804                 return -EOPNOTSUPP;
 805         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 806                 return -EOPNOTSUPP;
 807
 808         down_read(&current->mm->mmap_sem);
 809         user_address = __gmap_translate(address1, vcpu->arch.gmap);
 810         if (IS_ERR_VALUE(user_address))
 811                 goto out_inject;
 812         vma = find_vma(current->mm, user_address);
 813         if (!vma)
 814                 goto out_inject;
 815         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 816         if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
 817                 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
 818         if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
 819                 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
 820
 821         up_read(&current->mm->mmap_sem);
 822         return 0;
 823
 824 out_inject:
 825         up_read(&current->mm->mmap_sem);
 826         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 827 }
 828
 829 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
 830 {
 831         /* For e5xx... instructions we only handle TPROT */
 832         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
 833                 return handle_tprot(vcpu);
 834         return -EOPNOTSUPP;
 835 }
 836
 837 static int handle_sckpf(struct kvm_vcpu *vcpu)
 838 {
 839         u32 value;
 840
 841         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 842                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 843
 844         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
 845                 return kvm_s390_inject_program_int(vcpu,
 846                                                    PGM_SPECIFICATION);
 847
 848         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
 849         vcpu->arch.sie_block->todpr = value;
 850
 851         return 0;
 852 }
 853
 854 static const intercept_handler_t x01_handlers[256] = {
 855         [0x07] = handle_sckpf,
 856 };
 857
 858 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
 859 {
 860         intercept_handler_t handler;
 861
 862         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 863         if (handler)
 864                 return handler(vcpu);
 865         return -EOPNOTSUPP;
 866 }