target/s390x/diag.c

   1 /*
   2  * S390x DIAG instruction helper functions
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include "cpu.h"
  17 #include "internal.h"
  18 #include "exec/address-spaces.h"
  19 #include "hw/watchdog/wdt_diag288.h"
  20 #include "sysemu/cpus.h"
  21 #include "hw/s390x/ipl.h"
  22 #include "hw/s390x/s390-virtio-ccw.h"
  23 #include "hw/s390x/pv.h"
  24 #include "kvm_s390x.h"
  25
  26 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
  27 {
  28     uint64_t func = env->regs[r1];
  29     uint64_t timeout = env->regs[r1 + 1];
  30     uint64_t action = env->regs[r3];
  31     Object *obj;
  32     DIAG288State *diag288;
  33     DIAG288Class *diag288_class;
  34
  35     if (r1 % 2 || action != 0) {
  36         return -1;
  37     }
  38
  39     /* Timeout must be more than 15 seconds except for timer deletion */
  40     if (func != WDT_DIAG288_CANCEL && timeout < 15) {
  41         return -1;
  42     }
  43
  44     obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
  45     if (!obj) {
  46         return -1;
  47     }
  48
  49     diag288 = DIAG288(obj);
  50     diag288_class = DIAG288_GET_CLASS(diag288);
  51     return diag288_class->handle_timer(diag288, func, timeout);
  52 }
  53
  54 static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
  55                               uintptr_t ra, bool write)
  56 {
  57     /* Handled by the Ultravisor */
  58     if (s390_is_pv()) {
  59         return 0;
  60     }
  61     if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
  62         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  63         return -1;
  64     }
  65     if (!address_space_access_valid(&address_space_memory, addr,
  66                                     sizeof(IplParameterBlock), write,
  67                                     MEMTXATTRS_UNSPECIFIED)) {
  68         s390_program_interrupt(env, PGM_ADDRESSING, ra);
  69         return -1;
  70     }
  71     return 0;
  72 }
  73
  74 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
  75 {
  76     bool valid;
  77     CPUState *cs = env_cpu(env);
  78     S390CPU *cpu = S390_CPU(cs);
  79     uint64_t addr =  env->regs[r1];
  80     uint64_t subcode = env->regs[r3];
  81     IplParameterBlock *iplb;
  82
  83     if (env->psw.mask & PSW_MASK_PSTATE) {
  84         s390_program_interrupt(env, PGM_PRIVILEGED, ra);
  85         return;
  86     }
  87
  88     if (subcode & ~0x0ffffULL) {
  89         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  90         return;
  91     }
  92
  93     if (subcode >= DIAG308_PV_SET && !s390_has_feat(S390_FEAT_UNPACK)) {
  94         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  95         return;
  96     }
  97
  98     switch (subcode) {
  99     case DIAG308_RESET_MOD_CLR:
 100         s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
 101         break;
 102     case DIAG308_RESET_LOAD_NORM:
 103         s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
 104         break;
 105     case DIAG308_LOAD_CLEAR:
 106         /* Well we still lack the clearing bit... */
 107         s390_ipl_reset_request(cs, S390_RESET_REIPL);
 108         break;
 109     case DIAG308_SET:
 110     case DIAG308_PV_SET:
 111         if (diag308_parm_check(env, r1, addr, ra, false)) {
 112             return;
 113         }
 114         iplb = g_new0(IplParameterBlock, 1);
 115         if (!s390_is_pv()) {
 116             cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
 117         } else {
 118             s390_cpu_pv_mem_read(cpu, 0, iplb, sizeof(iplb->len));
 119         }
 120
 121         if (!iplb_valid_len(iplb)) {
 122             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 123             goto out;
 124         }
 125
 126         if (!s390_is_pv()) {
 127             cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 128         } else {
 129             s390_cpu_pv_mem_read(cpu, 0, iplb, be32_to_cpu(iplb->len));
 130         }
 131
 132         valid = subcode == DIAG308_PV_SET ? iplb_valid_pv(iplb) : iplb_valid(iplb);
 133         if (!valid) {
 134             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 135             goto out;
 136         }
 137
 138         s390_ipl_update_diag308(iplb);
 139         env->regs[r1 + 1] = DIAG_308_RC_OK;
 140 out:
 141         g_free(iplb);
 142         return;
 143     case DIAG308_STORE:
 144     case DIAG308_PV_STORE:
 145         if (diag308_parm_check(env, r1, addr, ra, true)) {
 146             return;
 147         }
 148         if (subcode == DIAG308_PV_STORE) {
 149             iplb = s390_ipl_get_iplb_pv();
 150         } else {
 151             iplb = s390_ipl_get_iplb();
 152         }
 153         if (!iplb) {
 154             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 155             return;
 156         }
 157
 158         if (!s390_is_pv()) {
 159             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 160         } else {
 161             s390_cpu_pv_mem_write(cpu, 0, iplb, be32_to_cpu(iplb->len));
 162         }
 163         env->regs[r1 + 1] = DIAG_308_RC_OK;
 164         return;
 165     case DIAG308_PV_START:
 166         iplb = s390_ipl_get_iplb_pv();
 167         if (!iplb) {
 168             env->regs[r1 + 1] = DIAG_308_RC_NO_PV_CONF;
 169             return;
 170         }
 171
 172         if (kvm_s390_get_hpage_1m()) {
 173             error_report("Protected VMs can currently not be backed with "
 174                          "huge pages");
 175             env->regs[r1 + 1] = DIAG_308_RC_INVAL_FOR_PV;
 176             return;
 177         }
 178
 179         s390_ipl_reset_request(cs, S390_RESET_PV);
 180         break;
 181     default:
 182         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
 183         break;
 184     }
 185 }