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 "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 }