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 "hw/watchdog/wdt_diag288.h"
  19 #include "sysemu/cpus.h"
  20 #include "hw/s390x/ipl.h"
  21 #include "hw/s390x/s390-virtio-ccw.h"
  22 #include "hw/s390x/pv.h"
  23 #include "kvm_s390x.h"
  24
  25 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
  26 {
  27     uint64_t func = env->regs[r1];
  28     uint64_t timeout = env->regs[r1 + 1];
  29     uint64_t action = env->regs[r3];
  30     Object *obj;
  31     DIAG288State *diag288;
  32     DIAG288Class *diag288_class;
  33
  34     if (r1 % 2 || action != 0) {
  35         return -1;
  36     }
  37
  38     /* Timeout must be more than 15 seconds except for timer deletion */
  39     if (func != WDT_DIAG288_CANCEL && timeout < 15) {
  40         return -1;
  41     }
  42
  43     obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
  44     if (!obj) {
  45         return -1;
  46     }
  47
  48     diag288 = DIAG288(obj);
  49     diag288_class = DIAG288_GET_CLASS(diag288);
  50     return diag288_class->handle_timer(diag288, func, timeout);
  51 }
  52
  53 static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
  54                               uintptr_t ra, bool write)
  55 {
  56     /* Handled by the Ultravisor */
  57     if (s390_is_pv()) {
  58         return 0;
  59     }
  60     if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
  61         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  62         return -1;
  63     }
  64     if (!address_space_access_valid(&address_space_memory, addr,
  65                                     sizeof(IplParameterBlock), write,
  66                                     MEMTXATTRS_UNSPECIFIED)) {
  67         s390_program_interrupt(env, PGM_ADDRESSING, ra);
  68         return -1;
  69     }
  70     return 0;
  71 }
  72
  73 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
  74 {
  75     bool valid;
  76     CPUState *cs = env_cpu(env);
  77     S390CPU *cpu = S390_CPU(cs);
  78     uint64_t addr =  env->regs[r1];
  79     uint64_t subcode = env->regs[r3];
  80     IplParameterBlock *iplb;
  81
  82     if (env->psw.mask & PSW_MASK_PSTATE) {
  83         s390_program_interrupt(env, PGM_PRIVILEGED, ra);
  84         return;
  85     }
  86
  87     if (subcode & ~0x0ffffULL) {
  88         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  89         return;
  90     }
  91
  92     if (subcode >= DIAG308_PV_SET && !s390_has_feat(S390_FEAT_UNPACK)) {
  93         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  94         return;
  95     }
  96
  97     switch (subcode) {
  98     case DIAG308_RESET_MOD_CLR:
  99         s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
 100         break;
 101     case DIAG308_RESET_LOAD_NORM:
 102         s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
 103         break;
 104     case DIAG308_LOAD_CLEAR:
 105         /* Well we still lack the clearing bit... */
 106         s390_ipl_reset_request(cs, S390_RESET_REIPL);
 107         break;
 108     case DIAG308_SET:
 109     case DIAG308_PV_SET:
 110         if (diag308_parm_check(env, r1, addr, ra, false)) {
 111             return;
 112         }
 113         iplb = g_new0(IplParameterBlock, 1);
 114         if (!s390_is_pv()) {
 115             cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
 116         } else {
 117             s390_cpu_pv_mem_read(cpu, 0, iplb, sizeof(iplb->len));
 118         }
 119
 120         if (!iplb_valid_len(iplb)) {
 121             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 122             goto out;
 123         }
 124
 125         if (!s390_is_pv()) {
 126             cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 127         } else {
 128             s390_cpu_pv_mem_read(cpu, 0, iplb, be32_to_cpu(iplb->len));
 129         }
 130
 131         valid = subcode == DIAG308_PV_SET ? iplb_valid_pv(iplb) : iplb_valid(iplb);
 132         if (!valid) {
 133             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 134             goto out;
 135         }
 136
 137         s390_ipl_update_diag308(iplb);
 138         env->regs[r1 + 1] = DIAG_308_RC_OK;
 139 out:
 140         g_free(iplb);
 141         return;
 142     case DIAG308_STORE:
 143     case DIAG308_PV_STORE:
 144         if (diag308_parm_check(env, r1, addr, ra, true)) {
 145             return;
 146         }
 147         if (subcode == DIAG308_PV_STORE) {
 148             iplb = s390_ipl_get_iplb_pv();
 149         } else {
 150             iplb = s390_ipl_get_iplb();
 151         }
 152         if (!iplb) {
 153             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 154             return;
 155         }
 156
 157         if (!s390_is_pv()) {
 158             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 159         } else {
 160             s390_cpu_pv_mem_write(cpu, 0, iplb, be32_to_cpu(iplb->len));
 161         }
 162         env->regs[r1 + 1] = DIAG_308_RC_OK;
 163         return;
 164     case DIAG308_PV_START:
 165         iplb = s390_ipl_get_iplb_pv();
 166         if (!iplb) {
 167             env->regs[r1 + 1] = DIAG_308_RC_NO_PV_CONF;
 168             return;
 169         }
 170
 171         if (kvm_s390_get_hpage_1m()) {
 172             error_report("Protected VMs can currently not be backed with "
 173                          "huge pages");
 174             env->regs[r1 + 1] = DIAG_308_RC_INVAL_FOR_PV;
 175             return;
 176         }
 177
 178         s390_ipl_reset_request(cs, S390_RESET_PV);
 179         break;
 180     default:
 181         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
 182         break;
 183     }
 184 }