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 2.1 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"
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"
37 * Maximum allowed virtual threads per virtual core
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).
47 static const CompatInfo compat_table[] = {
49 * Ordered from oldest to newest - the code relies on this
51 { /* POWER6, ISA2.05 */
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,
59 { /* POWER7, ISA2.06 */
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,
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,
75 { /* POWER8, ISA2.07 */
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,
82 { /* POWER9, ISA3.00 */
84 .pvr = CPU_POWERPC_LOGICAL_3_00,
85 .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00,
86 .pcr_level = PCR_COMPAT_3_00,
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.
96 { /* POWER10, ISA3.10 */
98 .pvr = CPU_POWERPC_LOGICAL_3_10,
99 .pcr = PCR_COMPAT_3_10,
100 .pcr_level = PCR_COMPAT_3_10,
105 static const CompatInfo *compat_by_pvr(uint32_t pvr)
109 for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
110 if (compat_table[i].pvr == pvr) {
111 return &compat_table[i];
117 static bool pcc_compat(PowerPCCPUClass *pcc, uint32_t compat_pvr,
118 uint32_t min_compat_pvr, uint32_t max_compat_pvr)
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);
124 g_assert(!min_compat_pvr || min);
125 g_assert(!max_compat_pvr || max);
128 /* Not a recognized logical PVR */
131 if ((min && (compat < min)) || (max && (compat > max))) {
132 /* Outside specified range */
135 if (!(pcc->pcr_supported & compat->pcr_level)) {
136 /* Not supported by this CPU */
142 bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr,
143 uint32_t min_compat_pvr, uint32_t max_compat_pvr)
145 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
147 #if !defined(CONFIG_USER_ONLY)
151 return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr);
154 bool ppc_type_check_compat(const char *cputype, uint32_t compat_pvr,
155 uint32_t min_compat_pvr, uint32_t max_compat_pvr)
157 PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(object_class_by_name(cputype));
158 return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr);
161 int ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp)
163 const CompatInfo *compat = compat_by_pvr(compat_pvr);
164 CPUPPCState *env = &cpu->env;
165 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
170 } else if (!compat) {
171 error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr);
173 } else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) {
174 error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU",
181 cpu_synchronize_state(CPU(cpu));
183 if (kvm_enabled() && cpu->compat_pvr != compat_pvr) {
184 int ret = kvmppc_set_compat(cpu, compat_pvr);
186 error_setg_errno(errp, -ret,
187 "Unable to set CPU compatibility mode in KVM");
192 cpu->compat_pvr = compat_pvr;
193 env->spr[SPR_PCR] = pcr & pcc->pcr_mask;
203 static void do_set_compat(CPUState *cs, run_on_cpu_data arg)
205 PowerPCCPU *cpu = POWERPC_CPU(cs);
206 SetCompatState *s = arg.host_ptr;
208 s->ret = ppc_set_compat(cpu, s->compat_pvr, s->errp);
211 int ppc_set_compat_all(uint32_t compat_pvr, Error **errp)
217 .compat_pvr = compat_pvr,
222 run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s));
232 int ppc_compat_max_vthreads(PowerPCCPU *cpu)
234 const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr);
235 int n_threads = CPU(cpu)->nr_threads;
237 if (cpu->compat_pvr) {
239 n_threads = MIN(n_threads, compat->max_vthreads);
245 static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name,
246 void *opaque, Error **errp)
248 uint32_t compat_pvr = *((uint32_t *)opaque);
254 const CompatInfo *compat = compat_by_pvr(compat_pvr);
258 value = compat->name;
261 visit_type_str(v, name, (char **)&value, errp);
264 static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name,
265 void *opaque, Error **errp)
270 if (!visit_type_str(v, name, &value, errp)) {
274 if (strcmp(value, "") == 0) {
278 const CompatInfo *compat = NULL;
280 for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
281 if (strcmp(value, compat_table[i].name) == 0) {
282 compat = &compat_table[i];
289 error_setg(errp, "Invalid compatibility mode \"%s\"", value);
292 compat_pvr = compat->pvr;
295 *((uint32_t *)opaque) = compat_pvr;
301 void ppc_compat_add_property(Object *obj, const char *name,
302 uint32_t *compat_pvr, const char *basedesc)
304 gchar *namesv[ARRAY_SIZE(compat_table) + 1];
308 object_property_add(obj, name, "string",
309 ppc_compat_prop_get, ppc_compat_prop_set, NULL,
312 for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
314 * Have to discard const here, because g_strjoinv() takes
315 * (gchar **), not (const gchar **) :(
317 namesv[i] = (gchar *)compat_table[i].name;
319 namesv[ARRAY_SIZE(compat_table)] = NULL;
321 names = g_strjoinv(", ", namesv);
322 desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names);
323 object_property_set_description(obj, name, desc);