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 "cpu-models.h" 28 29 typedef struct { 30 uint32_t pvr; 31 uint64_t pcr; 32 uint64_t pcr_level; 33 int max_threads; 34 } CompatInfo; 35 36 static const CompatInfo compat_table[] = { 37 /* 38 * Ordered from oldest to newest - the code relies on this 39 */ 40 { /* POWER6, ISA2.05 */ 41 .pvr = CPU_POWERPC_LOGICAL_2_05, 42 .pcr = PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_COMPAT_2_05 43 | PCR_TM_DIS | PCR_VSX_DIS, 44 .pcr_level = PCR_COMPAT_2_05, 45 .max_threads = 2, 46 }, 47 { /* POWER7, ISA2.06 */ 48 .pvr = CPU_POWERPC_LOGICAL_2_06, 49 .pcr = PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS, 50 .pcr_level = PCR_COMPAT_2_06, 51 .max_threads = 4, 52 }, 53 { 54 .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS, 55 .pcr = PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_TM_DIS, 56 .pcr_level = PCR_COMPAT_2_06, 57 .max_threads = 4, 58 }, 59 { /* POWER8, ISA2.07 */ 60 .pvr = CPU_POWERPC_LOGICAL_2_07, 61 .pcr = PCR_COMPAT_2_07, 62 .pcr_level = PCR_COMPAT_2_07, 63 .max_threads = 8, 64 }, 65 }; 66 67 static const CompatInfo *compat_by_pvr(uint32_t pvr) 68 { 69 int i; 70 71 for (i = 0; i < ARRAY_SIZE(compat_table); i++) { 72 if (compat_table[i].pvr == pvr) { 73 return &compat_table[i]; 74 } 75 } 76 return NULL; 77 } 78 79 bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr, 80 uint32_t min_compat_pvr, uint32_t max_compat_pvr) 81 { 82 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 83 const CompatInfo *compat = compat_by_pvr(compat_pvr); 84 const CompatInfo *min = compat_by_pvr(min_compat_pvr); 85 const CompatInfo *max = compat_by_pvr(max_compat_pvr); 86 87 #if !defined(CONFIG_USER_ONLY) 88 g_assert(cpu->vhyp); 89 #endif 90 g_assert(!min_compat_pvr || min); 91 g_assert(!max_compat_pvr || max); 92 93 if (!compat) { 94 /* Not a recognized logical PVR */ 95 return false; 96 } 97 if ((min && (compat < min)) || (max && (compat > max))) { 98 /* Outside specified range */ 99 return false; 100 } 101 if (!(pcc->pcr_supported & compat->pcr_level)) { 102 /* Not supported by this CPU */ 103 return false; 104 } 105 return true; 106 } 107 108 void ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp) 109 { 110 const CompatInfo *compat = compat_by_pvr(compat_pvr); 111 CPUPPCState *env = &cpu->env; 112 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 113 uint64_t pcr; 114 115 if (!compat_pvr) { 116 pcr = 0; 117 } else if (!compat) { 118 error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr); 119 return; 120 } else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) { 121 error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU", 122 compat_pvr); 123 return; 124 } else { 125 pcr = compat->pcr; 126 } 127 128 cpu_synchronize_state(CPU(cpu)); 129 130 cpu->compat_pvr = compat_pvr; 131 env->spr[SPR_PCR] = pcr & pcc->pcr_mask; 132 133 if (kvm_enabled()) { 134 int ret = kvmppc_set_compat(cpu, cpu->compat_pvr); 135 if (ret < 0) { 136 error_setg_errno(errp, -ret, 137 "Unable to set CPU compatibility mode in KVM"); 138 } 139 } 140 } 141 142 typedef struct { 143 uint32_t compat_pvr; 144 Error *err; 145 } SetCompatState; 146 147 static void do_set_compat(CPUState *cs, run_on_cpu_data arg) 148 { 149 PowerPCCPU *cpu = POWERPC_CPU(cs); 150 SetCompatState *s = arg.host_ptr; 151 152 ppc_set_compat(cpu, s->compat_pvr, &s->err); 153 } 154 155 void ppc_set_compat_all(uint32_t compat_pvr, Error **errp) 156 { 157 CPUState *cs; 158 159 CPU_FOREACH(cs) { 160 SetCompatState s = { 161 .compat_pvr = compat_pvr, 162 .err = NULL, 163 }; 164 165 run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s)); 166 167 if (s.err) { 168 error_propagate(errp, s.err); 169 return; 170 } 171 } 172 } 173 174 int ppc_compat_max_threads(PowerPCCPU *cpu) 175 { 176 const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr); 177 int n_threads = CPU(cpu)->nr_threads; 178 179 if (cpu->compat_pvr) { 180 g_assert(compat); 181 n_threads = MIN(n_threads, compat->max_threads); 182 } 183 184 return n_threads; 185 } 186