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_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | 55 PCR_COMPAT_2_06 | 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_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | 63 PCR_COMPAT_2_06 | PCR_TM_DIS, 64 .pcr_level = PCR_COMPAT_2_06, 65 .max_vthreads = 4, 66 }, 67 { 68 .name = "power7+", 69 .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS, 70 .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | 71 PCR_COMPAT_2_06 | PCR_TM_DIS, 72 .pcr_level = PCR_COMPAT_2_06, 73 .max_vthreads = 4, 74 }, 75 { /* POWER8, ISA2.07 */ 76 .name = "power8", 77 .pvr = CPU_POWERPC_LOGICAL_2_07, 78 .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07, 79 .pcr_level = PCR_COMPAT_2_07, 80 .max_vthreads = 8, 81 }, 82 { /* POWER9, ISA3.00 */ 83 .name = "power9", 84 .pvr = CPU_POWERPC_LOGICAL_3_00, 85 .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00, 86 .pcr_level = PCR_COMPAT_3_00, 87 /* 88 * POWER9 hardware only supports 4 threads / core, but this 89 * limit is for guests. We need to support 8 vthreads/vcore 90 * on POWER9 for POWER8 compatibility guests, and it's very 91 * confusing if half of the threads disappear from the guest 92 * if it announces it's POWER9 aware at CAS time. 93 */ 94 .max_vthreads = 8, 95 }, 96 { /* POWER10, ISA3.10 */ 97 .name = "power10", 98 .pvr = CPU_POWERPC_LOGICAL_3_10, 99 .pcr = PCR_COMPAT_3_10, 100 .pcr_level = PCR_COMPAT_3_10, 101 .max_vthreads = 8, 102 }, 103 }; 104 105 static const CompatInfo *compat_by_pvr(uint32_t pvr) 106 { 107 int i; 108 109 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 110 if (compat_table[i].pvr == pvr) { 111 return &compat_table[i]; 112 } 113 } 114 return NULL; 115 } 116 117 static bool pcc_compat(PowerPCCPUClass *pcc, uint32_t compat_pvr, 118 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 119 { 120 const CompatInfo *compat = compat_by_pvr(compat_pvr); 121 const CompatInfo *min = compat_by_pvr(min_compat_pvr); 122 const CompatInfo *max = compat_by_pvr(max_compat_pvr); 123 124 g_assert(!min_compat_pvr || min); 125 g_assert(!max_compat_pvr || max); 126 127 if (!compat) { 128 /* Not a recognized logical PVR */ 129 return false; 130 } 131 if ((min && (compat < min)) || (max && (compat > max))) { 132 /* Outside specified range */ 133 return false; 134 } 135 if (!(pcc->pcr_supported & compat->pcr_level)) { 136 /* Not supported by this CPU */ 137 return false; 138 } 139 return true; 140 } 141 142 bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr, 143 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 144 { 145 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 146 147 #if !defined(CONFIG_USER_ONLY) 148 g_assert(cpu->vhyp); 149 #endif 150 151 return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr); 152 } 153 154 bool ppc_type_check_compat(const char *cputype, uint32_t compat_pvr, 155 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 156 { 157 PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(object_class_by_name(cputype)); 158 return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr); 159 } 160 161 void ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp) 162 { 163 const CompatInfo *compat = compat_by_pvr(compat_pvr); 164 CPUPPCState *env = &cpu->env; 165 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 166 uint64_t pcr; 167 168 if (!compat_pvr) { 169 pcr = 0; 170 } else if (!compat) { 171 error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr); 172 return; 173 } else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) { 174 error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU", 175 compat_pvr); 176 return; 177 } else { 178 pcr = compat->pcr; 179 } 180 181 cpu_synchronize_state(CPU(cpu)); 182 183 if (kvm_enabled() && cpu->compat_pvr != compat_pvr) { 184 int ret = kvmppc_set_compat(cpu, compat_pvr); 185 if (ret < 0) { 186 error_setg_errno(errp, -ret, 187 "Unable to set CPU compatibility mode in KVM"); 188 return; 189 } 190 } 191 192 cpu->compat_pvr = compat_pvr; 193 env->spr[SPR_PCR] = pcr & pcc->pcr_mask; 194 } 195 196 typedef struct { 197 uint32_t compat_pvr; 198 Error *err; 199 } SetCompatState; 200 201 static void do_set_compat(CPUState *cs, run_on_cpu_data arg) 202 { 203 PowerPCCPU *cpu = POWERPC_CPU(cs); 204 SetCompatState *s = arg.host_ptr; 205 206 ppc_set_compat(cpu, s->compat_pvr, &s->err); 207 } 208 209 void ppc_set_compat_all(uint32_t compat_pvr, Error **errp) 210 { 211 CPUState *cs; 212 213 CPU_FOREACH(cs) { 214 SetCompatState s = { 215 .compat_pvr = compat_pvr, 216 .err = NULL, 217 }; 218 219 run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s)); 220 221 if (s.err) { 222 error_propagate(errp, s.err); 223 return; 224 } 225 } 226 } 227 228 int ppc_compat_max_vthreads(PowerPCCPU *cpu) 229 { 230 const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr); 231 int n_threads = CPU(cpu)->nr_threads; 232 233 if (cpu->compat_pvr) { 234 g_assert(compat); 235 n_threads = MIN(n_threads, compat->max_vthreads); 236 } 237 238 return n_threads; 239 } 240 241 static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name, 242 void *opaque, Error **errp) 243 { 244 uint32_t compat_pvr = *((uint32_t *)opaque); 245 const char *value; 246 247 if (!compat_pvr) { 248 value = ""; 249 } else { 250 const CompatInfo *compat = compat_by_pvr(compat_pvr); 251 252 g_assert(compat); 253 254 value = compat->name; 255 } 256 257 visit_type_str(v, name, (char **)&value, errp); 258 } 259 260 static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name, 261 void *opaque, Error **errp) 262 { 263 Error *local_err = NULL; 264 char *value; 265 uint32_t compat_pvr; 266 267 visit_type_str(v, name, &value, &local_err); 268 if (local_err) { 269 error_propagate(errp, local_err); 270 return; 271 } 272 273 if (strcmp(value, "") == 0) { 274 compat_pvr = 0; 275 } else { 276 int i; 277 const CompatInfo *compat = NULL; 278 279 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 280 if (strcmp(value, compat_table[i].name) == 0) { 281 compat = &compat_table[i]; 282 break; 283 284 } 285 } 286 287 if (!compat) { 288 error_setg(errp, "Invalid compatibility mode \"%s\"", value); 289 goto out; 290 } 291 compat_pvr = compat->pvr; 292 } 293 294 *((uint32_t *)opaque) = compat_pvr; 295 296 out: 297 g_free(value); 298 } 299 300 void ppc_compat_add_property(Object *obj, const char *name, 301 uint32_t *compat_pvr, const char *basedesc) 302 { 303 gchar *namesv[ARRAY_SIZE(compat_table) + 1]; 304 gchar *names, *desc; 305 int i; 306 307 object_property_add(obj, name, "string", 308 ppc_compat_prop_get, ppc_compat_prop_set, NULL, 309 compat_pvr); 310 311 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 312 /* 313 * Have to discard const here, because g_strjoinv() takes 314 * (gchar **), not (const gchar **) :( 315 */ 316 namesv[i] = (gchar *)compat_table[i].name; 317 } 318 namesv[ARRAY_SIZE(compat_table)] = NULL; 319 320 names = g_strjoinv(", ", namesv); 321 desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names); 322 object_property_set_description(obj, name, desc); 323 324 g_free(names); 325 g_free(desc); 326 } 327