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 36 /* 37 * Maximum allowed virtual threads per virtual core 38 * 39 * This is to stop older guests getting confused by seeing more 40 * threads than they think the cpu can support. Usually it's 41 * equal to the number of threads supported on bare metal 42 * hardware, but not always (see POWER9). 43 */ 44 int max_vthreads; 45 } CompatInfo; 46 47 static const CompatInfo compat_table[] = { 48 /* 49 * Ordered from oldest to newest - the code relies on this 50 */ 51 { /* POWER6, ISA2.05 */ 52 .name = "power6", 53 .pvr = CPU_POWERPC_LOGICAL_2_05, 54 .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | 55 PCR_COMPAT_2_05 | PCR_TM_DIS | PCR_VSX_DIS, 56 .pcr_level = PCR_COMPAT_2_05, 57 .max_vthreads = 2, 58 }, 59 { /* POWER7, ISA2.06 */ 60 .name = "power7", 61 .pvr = CPU_POWERPC_LOGICAL_2_06, 62 .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS, 63 .pcr_level = PCR_COMPAT_2_06, 64 .max_vthreads = 4, 65 }, 66 { 67 .name = "power7+", 68 .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS, 69 .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS, 70 .pcr_level = PCR_COMPAT_2_06, 71 .max_vthreads = 4, 72 }, 73 { /* POWER8, ISA2.07 */ 74 .name = "power8", 75 .pvr = CPU_POWERPC_LOGICAL_2_07, 76 .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07, 77 .pcr_level = PCR_COMPAT_2_07, 78 .max_vthreads = 8, 79 }, 80 { /* POWER9, ISA3.00 */ 81 .name = "power9", 82 .pvr = CPU_POWERPC_LOGICAL_3_00, 83 .pcr = PCR_COMPAT_3_00, 84 .pcr_level = PCR_COMPAT_3_00, 85 /* 86 * POWER9 hardware only supports 4 threads / core, but this 87 * limit is for guests. We need to support 8 vthreads/vcore 88 * on POWER9 for POWER8 compatibility guests, and it's very 89 * confusing if half of the threads disappear from the guest 90 * if it announces it's POWER9 aware at CAS time. 91 */ 92 .max_vthreads = 8, 93 }, 94 }; 95 96 static const CompatInfo *compat_by_pvr(uint32_t pvr) 97 { 98 int i; 99 100 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 101 if (compat_table[i].pvr == pvr) { 102 return &compat_table[i]; 103 } 104 } 105 return NULL; 106 } 107 108 static bool pcc_compat(PowerPCCPUClass *pcc, uint32_t compat_pvr, 109 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 110 { 111 const CompatInfo *compat = compat_by_pvr(compat_pvr); 112 const CompatInfo *min = compat_by_pvr(min_compat_pvr); 113 const CompatInfo *max = compat_by_pvr(max_compat_pvr); 114 115 g_assert(!min_compat_pvr || min); 116 g_assert(!max_compat_pvr || max); 117 118 if (!compat) { 119 /* Not a recognized logical PVR */ 120 return false; 121 } 122 if ((min && (compat < min)) || (max && (compat > max))) { 123 /* Outside specified range */ 124 return false; 125 } 126 if (!(pcc->pcr_supported & compat->pcr_level)) { 127 /* Not supported by this CPU */ 128 return false; 129 } 130 return true; 131 } 132 133 bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr, 134 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 135 { 136 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 137 138 #if !defined(CONFIG_USER_ONLY) 139 g_assert(cpu->vhyp); 140 #endif 141 142 return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr); 143 } 144 145 bool ppc_type_check_compat(const char *cputype, uint32_t compat_pvr, 146 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 147 { 148 PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(object_class_by_name(cputype)); 149 return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr); 150 } 151 152 void ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp) 153 { 154 const CompatInfo *compat = compat_by_pvr(compat_pvr); 155 CPUPPCState *env = &cpu->env; 156 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 157 uint64_t pcr; 158 159 if (!compat_pvr) { 160 pcr = 0; 161 } else if (!compat) { 162 error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr); 163 return; 164 } else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) { 165 error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU", 166 compat_pvr); 167 return; 168 } else { 169 pcr = compat->pcr; 170 } 171 172 cpu_synchronize_state(CPU(cpu)); 173 174 if (kvm_enabled() && cpu->compat_pvr != compat_pvr) { 175 int ret = kvmppc_set_compat(cpu, compat_pvr); 176 if (ret < 0) { 177 error_setg_errno(errp, -ret, 178 "Unable to set CPU compatibility mode in KVM"); 179 return; 180 } 181 } 182 183 cpu->compat_pvr = compat_pvr; 184 env->spr[SPR_PCR] = pcr & pcc->pcr_mask; 185 } 186 187 typedef struct { 188 uint32_t compat_pvr; 189 Error *err; 190 } SetCompatState; 191 192 static void do_set_compat(CPUState *cs, run_on_cpu_data arg) 193 { 194 PowerPCCPU *cpu = POWERPC_CPU(cs); 195 SetCompatState *s = arg.host_ptr; 196 197 ppc_set_compat(cpu, s->compat_pvr, &s->err); 198 } 199 200 void ppc_set_compat_all(uint32_t compat_pvr, Error **errp) 201 { 202 CPUState *cs; 203 204 CPU_FOREACH(cs) { 205 SetCompatState s = { 206 .compat_pvr = compat_pvr, 207 .err = NULL, 208 }; 209 210 run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s)); 211 212 if (s.err) { 213 error_propagate(errp, s.err); 214 return; 215 } 216 } 217 } 218 219 int ppc_compat_max_vthreads(PowerPCCPU *cpu) 220 { 221 const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr); 222 int n_threads = CPU(cpu)->nr_threads; 223 224 if (cpu->compat_pvr) { 225 g_assert(compat); 226 n_threads = MIN(n_threads, compat->max_vthreads); 227 } 228 229 return n_threads; 230 } 231 232 static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name, 233 void *opaque, Error **errp) 234 { 235 uint32_t compat_pvr = *((uint32_t *)opaque); 236 const char *value; 237 238 if (!compat_pvr) { 239 value = ""; 240 } else { 241 const CompatInfo *compat = compat_by_pvr(compat_pvr); 242 243 g_assert(compat); 244 245 value = compat->name; 246 } 247 248 visit_type_str(v, name, (char **)&value, errp); 249 } 250 251 static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name, 252 void *opaque, Error **errp) 253 { 254 Error *local_err = NULL; 255 char *value; 256 uint32_t compat_pvr; 257 258 visit_type_str(v, name, &value, &local_err); 259 if (local_err) { 260 error_propagate(errp, local_err); 261 return; 262 } 263 264 if (strcmp(value, "") == 0) { 265 compat_pvr = 0; 266 } else { 267 int i; 268 const CompatInfo *compat = NULL; 269 270 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 271 if (strcmp(value, compat_table[i].name) == 0) { 272 compat = &compat_table[i]; 273 break; 274 275 } 276 } 277 278 if (!compat) { 279 error_setg(errp, "Invalid compatibility mode \"%s\"", value); 280 goto out; 281 } 282 compat_pvr = compat->pvr; 283 } 284 285 *((uint32_t *)opaque) = compat_pvr; 286 287 out: 288 g_free(value); 289 } 290 291 void ppc_compat_add_property(Object *obj, const char *name, 292 uint32_t *compat_pvr, const char *basedesc, 293 Error **errp) 294 { 295 Error *local_err = NULL; 296 gchar *namesv[ARRAY_SIZE(compat_table) + 1]; 297 gchar *names, *desc; 298 int i; 299 300 object_property_add(obj, name, "string", 301 ppc_compat_prop_get, ppc_compat_prop_set, NULL, 302 compat_pvr, &local_err); 303 if (local_err) { 304 goto out; 305 } 306 307 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 308 /* 309 * Have to discard const here, because g_strjoinv() takes 310 * (gchar **), not (const gchar **) :( 311 */ 312 namesv[i] = (gchar *)compat_table[i].name; 313 } 314 namesv[ARRAY_SIZE(compat_table)] = NULL; 315 316 names = g_strjoinv(", ", namesv); 317 desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names); 318 object_property_set_description(obj, name, desc, &local_err); 319 320 g_free(names); 321 g_free(desc); 322 323 out: 324 error_propagate(errp, local_err); 325 } 326