target/ppc/compat.c

   1 /*
   2  *  PowerPC CPU initialization for qemu.
   3  *
   4  *  Copyright 2016, David Gibson, Red Hat Inc. <dgibson@redhat.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "sysemu/hw_accel.h"
  22 #include "sysemu/kvm.h"
  23 #include "kvm_ppc.h"
  24 #include "sysemu/cpus.h"
  25 #include "qemu/error-report.h"
  26 #include "qapi/error.h"
  27 #include "qapi/visitor.h"
  28 #include "cpu-models.h"
  29
  30 typedef struct {
  31     const char *name;
  32     uint32_t pvr;
  33     uint64_t pcr;
  34     uint64_t pcr_level;
  35     int max_threads;
  36 } CompatInfo;
  37
  38 static const CompatInfo compat_table[] = {
  39     /*
  40      * Ordered from oldest to newest - the code relies on this
  41      */
  42     { /* POWER6, ISA2.05 */
  43         .name = "power6",
  44         .pvr = CPU_POWERPC_LOGICAL_2_05,
  45         .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 |
  46                PCR_COMPAT_2_05 | PCR_TM_DIS | PCR_VSX_DIS,
  47         .pcr_level = PCR_COMPAT_2_05,
  48         .max_threads = 2,
  49     },
  50     { /* POWER7, ISA2.06 */
  51         .name = "power7",
  52         .pvr = CPU_POWERPC_LOGICAL_2_06,
  53         .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS,
  54         .pcr_level = PCR_COMPAT_2_06,
  55         .max_threads = 4,
  56     },
  57     {
  58         .name = "power7+",
  59         .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS,
  60         .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS,
  61         .pcr_level = PCR_COMPAT_2_06,
  62         .max_threads = 4,
  63     },
  64     { /* POWER8, ISA2.07 */
  65         .name = "power8",
  66         .pvr = CPU_POWERPC_LOGICAL_2_07,
  67         .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07,
  68         .pcr_level = PCR_COMPAT_2_07,
  69         .max_threads = 8,
  70     },
  71     { /* POWER9, ISA3.00 */
  72         .name = "power9",
  73         .pvr = CPU_POWERPC_LOGICAL_3_00,
  74         .pcr = PCR_COMPAT_3_00,
  75         .pcr_level = PCR_COMPAT_3_00,
  76         .max_threads = 4,
  77     },
  78 };
  79
  80 static const CompatInfo *compat_by_pvr(uint32_t pvr)
  81 {
  82     int i;
  83
  84     for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
  85         if (compat_table[i].pvr == pvr) {
  86             return &compat_table[i];
  87         }
  88     }
  89     return NULL;
  90 }
  91
  92 bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr,
  93                       uint32_t min_compat_pvr, uint32_t max_compat_pvr)
  94 {
  95     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
  96     const CompatInfo *compat = compat_by_pvr(compat_pvr);
  97     const CompatInfo *min = compat_by_pvr(min_compat_pvr);
  98     const CompatInfo *max = compat_by_pvr(max_compat_pvr);
  99
 100 #if !defined(CONFIG_USER_ONLY)
 101     g_assert(cpu->vhyp);
 102 #endif
 103     g_assert(!min_compat_pvr || min);
 104     g_assert(!max_compat_pvr || max);
 105
 106     if (!compat) {
 107         /* Not a recognized logical PVR */
 108         return false;
 109     }
 110     if ((min && (compat < min)) || (max && (compat > max))) {
 111         /* Outside specified range */
 112         return false;
 113     }
 114     if (!(pcc->pcr_supported & compat->pcr_level)) {
 115         /* Not supported by this CPU */
 116         return false;
 117     }
 118     return true;
 119 }
 120
 121 void ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp)
 122 {
 123     const CompatInfo *compat = compat_by_pvr(compat_pvr);
 124     CPUPPCState *env = &cpu->env;
 125     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 126     uint64_t pcr;
 127
 128     if (!compat_pvr) {
 129         pcr = 0;
 130     } else if (!compat) {
 131         error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr);
 132         return;
 133     } else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) {
 134         error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU",
 135                    compat_pvr);
 136         return;
 137     } else {
 138         pcr = compat->pcr;
 139     }
 140
 141     cpu_synchronize_state(CPU(cpu));
 142
 143     if (kvm_enabled() && cpu->compat_pvr != compat_pvr) {
 144         int ret = kvmppc_set_compat(cpu, cpu->compat_pvr);
 145         if (ret < 0) {
 146             error_setg_errno(errp, -ret,
 147                              "Unable to set CPU compatibility mode in KVM");
 148             return;
 149         }
 150     }
 151
 152     cpu->compat_pvr = compat_pvr;
 153     env->spr[SPR_PCR] = pcr & pcc->pcr_mask;
 154 }
 155
 156 typedef struct {
 157     uint32_t compat_pvr;
 158     Error *err;
 159 } SetCompatState;
 160
 161 static void do_set_compat(CPUState *cs, run_on_cpu_data arg)
 162 {
 163     PowerPCCPU *cpu = POWERPC_CPU(cs);
 164     SetCompatState *s = arg.host_ptr;
 165
 166     ppc_set_compat(cpu, s->compat_pvr, &s->err);
 167 }
 168
 169 void ppc_set_compat_all(uint32_t compat_pvr, Error **errp)
 170 {
 171     CPUState *cs;
 172
 173     CPU_FOREACH(cs) {
 174         SetCompatState s = {
 175             .compat_pvr = compat_pvr,
 176             .err = NULL,
 177         };
 178
 179         run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s));
 180
 181         if (s.err) {
 182             error_propagate(errp, s.err);
 183             return;
 184         }
 185     }
 186 }
 187
 188 int ppc_compat_max_threads(PowerPCCPU *cpu)
 189 {
 190     const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr);
 191     int n_threads = CPU(cpu)->nr_threads;
 192
 193     if (cpu->compat_pvr) {
 194         g_assert(compat);
 195         n_threads = MIN(n_threads, compat->max_threads);
 196     }
 197
 198     return n_threads;
 199 }
 200
 201 static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name,
 202                                 void *opaque, Error **errp)
 203 {
 204     uint32_t compat_pvr = *((uint32_t *)opaque);
 205     const char *value;
 206
 207     if (!compat_pvr) {
 208         value = "";
 209     } else {
 210         const CompatInfo *compat = compat_by_pvr(compat_pvr);
 211
 212         g_assert(compat);
 213
 214         value = compat->name;
 215     }
 216
 217     visit_type_str(v, name, (char **)&value, errp);
 218 }
 219
 220 static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name,
 221                                 void *opaque, Error **errp)
 222 {
 223     Error *local_err = NULL;
 224     char *value;
 225     uint32_t compat_pvr;
 226
 227     visit_type_str(v, name, &value, &local_err);
 228     if (local_err) {
 229         error_propagate(errp, local_err);
 230         return;
 231     }
 232
 233     if (strcmp(value, "") == 0) {
 234         compat_pvr = 0;
 235     } else {
 236         int i;
 237         const CompatInfo *compat = NULL;
 238
 239         for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
 240             if (strcmp(value, compat_table[i].name) == 0) {
 241                 compat = &compat_table[i];
 242                 break;
 243
 244             }
 245         }
 246
 247         if (!compat) {
 248             error_setg(errp, "Invalid compatibility mode \"%s\"", value);
 249             goto out;
 250         }
 251         compat_pvr = compat->pvr;
 252     }
 253
 254     *((uint32_t *)opaque) = compat_pvr;
 255
 256 out:
 257     g_free(value);
 258 }
 259
 260 void ppc_compat_add_property(Object *obj, const char *name,
 261                              uint32_t *compat_pvr, const char *basedesc,
 262                              Error **errp)
 263 {
 264     Error *local_err = NULL;
 265     gchar *namesv[ARRAY_SIZE(compat_table) + 1];
 266     gchar *names, *desc;
 267     int i;
 268
 269     object_property_add(obj, name, "string",
 270                         ppc_compat_prop_get, ppc_compat_prop_set, NULL,
 271                         compat_pvr, &local_err);
 272     if (local_err) {
 273         goto out;
 274     }
 275
 276     for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
 277         /*
 278          * Have to discard const here, because g_strjoinv() takes
 279          * (gchar **), not (const gchar **) :(
 280          */
 281         namesv[i] = (gchar *)compat_table[i].name;
 282     }
 283     namesv[ARRAY_SIZE(compat_table)] = NULL;
 284
 285     names = g_strjoinv(", ", namesv);
 286     desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names);
 287     object_property_set_description(obj, name, desc, &local_err);
 288
 289     g_free(names);
 290     g_free(desc);
 291
 292 out:
 293     error_propagate(errp, local_err);
 294 }