ppc: fix setting of compat mode
[qemu.git] / target / ppc / compat.c
blobad8f93c0644e26d4025dbec40dd0b39ecb5dcc2b
1 /*
2 * PowerPC CPU initialization for qemu.
4 * Copyright 2016, David Gibson, Red Hat Inc. <dgibson@redhat.com>
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.
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.
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/>.
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"
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;
38 static const CompatInfo compat_table[] = {
40 * Ordered from oldest to newest - the code relies on this
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,
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,
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,
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,
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,
80 static const CompatInfo *compat_by_pvr(uint32_t pvr)
82 int i;
84 for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
85 if (compat_table[i].pvr == pvr) {
86 return &compat_table[i];
89 return NULL;
92 bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr,
93 uint32_t min_compat_pvr, uint32_t max_compat_pvr)
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);
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);
106 if (!compat) {
107 /* Not a recognized logical PVR */
108 return false;
110 if ((min && (compat < min)) || (max && (compat > max))) {
111 /* Outside specified range */
112 return false;
114 if (!(pcc->pcr_supported & compat->pcr_level)) {
115 /* Not supported by this CPU */
116 return false;
118 return true;
121 void ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp)
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;
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;
141 cpu_synchronize_state(CPU(cpu));
143 if (kvm_enabled() && cpu->compat_pvr != compat_pvr) {
144 int ret = kvmppc_set_compat(cpu, compat_pvr);
145 if (ret < 0) {
146 error_setg_errno(errp, -ret,
147 "Unable to set CPU compatibility mode in KVM");
148 return;
152 cpu->compat_pvr = compat_pvr;
153 env->spr[SPR_PCR] = pcr & pcc->pcr_mask;
156 typedef struct {
157 uint32_t compat_pvr;
158 Error *err;
159 } SetCompatState;
161 static void do_set_compat(CPUState *cs, run_on_cpu_data arg)
163 PowerPCCPU *cpu = POWERPC_CPU(cs);
164 SetCompatState *s = arg.host_ptr;
166 ppc_set_compat(cpu, s->compat_pvr, &s->err);
169 void ppc_set_compat_all(uint32_t compat_pvr, Error **errp)
171 CPUState *cs;
173 CPU_FOREACH(cs) {
174 SetCompatState s = {
175 .compat_pvr = compat_pvr,
176 .err = NULL,
179 run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s));
181 if (s.err) {
182 error_propagate(errp, s.err);
183 return;
188 int ppc_compat_max_threads(PowerPCCPU *cpu)
190 const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr);
191 int n_threads = CPU(cpu)->nr_threads;
193 if (cpu->compat_pvr) {
194 g_assert(compat);
195 n_threads = MIN(n_threads, compat->max_threads);
198 return n_threads;
201 static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name,
202 void *opaque, Error **errp)
204 uint32_t compat_pvr = *((uint32_t *)opaque);
205 const char *value;
207 if (!compat_pvr) {
208 value = "";
209 } else {
210 const CompatInfo *compat = compat_by_pvr(compat_pvr);
212 g_assert(compat);
214 value = compat->name;
217 visit_type_str(v, name, (char **)&value, errp);
220 static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name,
221 void *opaque, Error **errp)
223 Error *local_err = NULL;
224 char *value;
225 uint32_t compat_pvr;
227 visit_type_str(v, name, &value, &local_err);
228 if (local_err) {
229 error_propagate(errp, local_err);
230 return;
233 if (strcmp(value, "") == 0) {
234 compat_pvr = 0;
235 } else {
236 int i;
237 const CompatInfo *compat = NULL;
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;
247 if (!compat) {
248 error_setg(errp, "Invalid compatibility mode \"%s\"", value);
249 goto out;
251 compat_pvr = compat->pvr;
254 *((uint32_t *)opaque) = compat_pvr;
256 out:
257 g_free(value);
260 void ppc_compat_add_property(Object *obj, const char *name,
261 uint32_t *compat_pvr, const char *basedesc,
262 Error **errp)
264 Error *local_err = NULL;
265 gchar *namesv[ARRAY_SIZE(compat_table) + 1];
266 gchar *names, *desc;
267 int i;
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;
276 for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
278 * Have to discard const here, because g_strjoinv() takes
279 * (gchar **), not (const gchar **) :(
281 namesv[i] = (gchar *)compat_table[i].name;
283 namesv[ARRAY_SIZE(compat_table)] = NULL;
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);
289 g_free(names);
290 g_free(desc);
292 out:
293 error_propagate(errp, local_err);