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 "s390x-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 "sysemu/kvm.h"
  23 #include "kvm/kvm_s390x.h"
  24 #include "target/s390x/kvm/pv.h"
  25 #include "qemu/error-report.h"
  26
  27
  28 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
  29 {
  30     uint64_t func = env->regs[r1];
  31     uint64_t timeout = env->regs[r1 + 1];
  32     uint64_t action = env->regs[r3];
  33     Object *obj;
  34     DIAG288State *diag288;
  35     DIAG288Class *diag288_class;
  36
  37     if (r1 % 2 || action != 0) {
  38         return -1;
  39     }
  40
  41     /* Timeout must be more than 15 seconds except for timer deletion */
  42     if (func != WDT_DIAG288_CANCEL && timeout < 15) {
  43         return -1;
  44     }
  45
  46     obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
  47     if (!obj) {
  48         return -1;
  49     }
  50
  51     diag288 = DIAG288(obj);
  52     diag288_class = DIAG288_GET_CLASS(diag288);
  53     return diag288_class->handle_timer(diag288, func, timeout);
  54 }
  55
  56 static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
  57                               uintptr_t ra, bool write)
  58 {
  59     /* Handled by the Ultravisor */
  60     if (s390_is_pv()) {
  61         return 0;
  62     }
  63     if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
  64         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  65         return -1;
  66     }
  67     if (!address_space_access_valid(&address_space_memory, addr,
  68                                     sizeof(IplParameterBlock), write,
  69                                     MEMTXATTRS_UNSPECIFIED)) {
  70         s390_program_interrupt(env, PGM_ADDRESSING, ra);
  71         return -1;
  72     }
  73     return 0;
  74 }
  75
  76 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
  77 {
  78     bool valid;
  79     CPUState *cs = env_cpu(env);
  80     S390CPU *cpu = S390_CPU(cs);
  81     uint64_t addr =  env->regs[r1];
  82     uint64_t subcode = env->regs[r3];
  83     IplParameterBlock *iplb;
  84
  85     if (env->psw.mask & PSW_MASK_PSTATE) {
  86         s390_program_interrupt(env, PGM_PRIVILEGED, ra);
  87         return;
  88     }
  89
  90     if (subcode & ~0x0ffffULL) {
  91         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  92         return;
  93     }
  94
  95     if (subcode >= DIAG308_PV_SET && !s390_has_feat(S390_FEAT_UNPACK)) {
  96         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  97         return;
  98     }
  99
 100     switch (subcode) {
 101     case DIAG308_RESET_MOD_CLR:
 102         s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
 103         break;
 104     case DIAG308_RESET_LOAD_NORM:
 105         s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
 106         break;
 107     case DIAG308_LOAD_CLEAR:
 108         /* Well we still lack the clearing bit... */
 109         s390_ipl_reset_request(cs, S390_RESET_REIPL);
 110         break;
 111     case DIAG308_SET:
 112     case DIAG308_PV_SET:
 113         if (diag308_parm_check(env, r1, addr, ra, false)) {
 114             return;
 115         }
 116         iplb = g_new0(IplParameterBlock, 1);
 117         if (!s390_is_pv()) {
 118             cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
 119         } else {
 120             s390_cpu_pv_mem_read(cpu, 0, iplb, sizeof(iplb->len));
 121         }
 122
 123         if (!iplb_valid_len(iplb)) {
 124             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 125             goto out;
 126         }
 127
 128         if (!s390_is_pv()) {
 129             cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 130         } else {
 131             s390_cpu_pv_mem_read(cpu, 0, iplb, be32_to_cpu(iplb->len));
 132         }
 133
 134         valid = subcode == DIAG308_PV_SET ? iplb_valid_pv(iplb) : iplb_valid(iplb);
 135         if (!valid) {
 136             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 137             goto out;
 138         }
 139
 140         s390_ipl_update_diag308(iplb);
 141         env->regs[r1 + 1] = DIAG_308_RC_OK;
 142 out:
 143         g_free(iplb);
 144         return;
 145     case DIAG308_STORE:
 146     case DIAG308_PV_STORE:
 147         if (diag308_parm_check(env, r1, addr, ra, true)) {
 148             return;
 149         }
 150         if (subcode == DIAG308_PV_STORE) {
 151             iplb = s390_ipl_get_iplb_pv();
 152         } else {
 153             iplb = s390_ipl_get_iplb();
 154         }
 155         if (!iplb) {
 156             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 157             return;
 158         }
 159
 160         if (!s390_is_pv()) {
 161             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 162         } else {
 163             s390_cpu_pv_mem_write(cpu, 0, iplb, be32_to_cpu(iplb->len));
 164         }
 165         env->regs[r1 + 1] = DIAG_308_RC_OK;
 166         return;
 167     case DIAG308_PV_START:
 168         iplb = s390_ipl_get_iplb_pv();
 169         if (!iplb) {
 170             env->regs[r1 + 1] = DIAG_308_RC_NO_PV_CONF;
 171             return;
 172         }
 173
 174         if (kvm_enabled() && kvm_s390_get_hpage_1m()) {
 175             error_report("Protected VMs can currently not be backed with "
 176                          "huge pages");
 177             env->regs[r1 + 1] = DIAG_308_RC_INVAL_FOR_PV;
 178             return;
 179         }
 180
 181         s390_ipl_reset_request(cs, S390_RESET_PV);
 182         break;
 183     default:
 184         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
 185         break;
 186     }
 187 }