1 /*
2 * QEMU S/390 CPU - System Emulation-only code
3 *
4 * Copyright (c) 2009 Ulrich Hecht
5 * Copyright (c) 2011 Alexander Graf
6 * Copyright (c) 2012 SUSE LINUX Products GmbH
7 * Copyright (c) 2012 IBM Corp.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "qemu/osdep.h"
24 #include "qemu/error-report.h"
25 #include "qapi/error.h"
26 #include "cpu.h"
27 #include "s390x-internal.h"
28 #include "kvm/kvm_s390x.h"
29 #include "sysemu/kvm.h"
30 #include "sysemu/reset.h"
31 #include "qemu/timer.h"
32 #include "trace.h"
33 #include "qapi/qapi-visit-run-state.h"
34 #include "sysemu/hw_accel.h"
35
36 #include "target/s390x/kvm/pv.h"
37 #include "hw/boards.h"
38 #include "sysemu/sysemu.h"
39 #include "sysemu/tcg.h"
40 #include "hw/core/sysemu-cpu-ops.h"
41
42 /* S390CPUClass::load_normal() */
s390_cpu_load_normal(CPUState * s)43 static void s390_cpu_load_normal(CPUState *s)
44 {
45 S390CPU *cpu = S390_CPU(s);
46 uint64_t spsw;
47
48 if (!s390_is_pv()) {
49 spsw = ldq_phys(s->as, 0);
50 cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
51 /*
52 * Invert short psw indication, so SIE will report a specification
53 * exception if it was not set.
54 */
55 cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
56 cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
57 } else {
58 /*
59 * Firmware requires us to set the load state before we set
60 * the cpu to operating on protected guests.
61 */
62 s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
63 }
64 s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
65 }
66
s390_cpu_machine_reset_cb(void * opaque)67 void s390_cpu_machine_reset_cb(void *opaque)
68 {
69 S390CPU *cpu = opaque;
70
71 run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
72 }
73
s390_cpu_get_crash_info(CPUState * cs)74 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
75 {
76 GuestPanicInformation *panic_info;
77 S390CPU *cpu = S390_CPU(cs);
78
79 cpu_synchronize_state(cs);
80 panic_info = g_new0(GuestPanicInformation, 1);
81
82 panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
83 panic_info->u.s390.core = cpu->env.core_id;
84 panic_info->u.s390.psw_mask = cpu->env.psw.mask;
85 panic_info->u.s390.psw_addr = cpu->env.psw.addr;
86 panic_info->u.s390.reason = cpu->env.crash_reason;
87
88 return panic_info;
89 }
90
s390_cpu_get_crash_info_qom(Object * obj,Visitor * v,const char * name,void * opaque,Error ** errp)91 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
92 const char *name, void *opaque,
93 Error **errp)
94 {
95 CPUState *cs = CPU(obj);
96 GuestPanicInformation *panic_info;
97
98 if (!cs->crash_occurred) {
99 error_setg(errp, "No crash occurred");
100 return;
101 }
102
103 panic_info = s390_cpu_get_crash_info(cs);
104
105 visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
106 errp);
107 qapi_free_GuestPanicInformation(panic_info);
108 }
109
s390_cpu_init_sysemu(Object * obj)110 void s390_cpu_init_sysemu(Object *obj)
111 {
112 CPUState *cs = CPU(obj);
113 S390CPU *cpu = S390_CPU(obj);
114
115 cs->start_powered_off = true;
116 object_property_add(obj, "crash-information", "GuestPanicInformation",
117 s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
118 cpu->env.tod_timer =
119 timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
120 cpu->env.cpu_timer =
121 timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
122 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
123 }
124
s390_cpu_realize_sysemu(DeviceState * dev,Error ** errp)125 bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp)
126 {
127 S390CPU *cpu = S390_CPU(dev);
128 MachineState *ms = MACHINE(qdev_get_machine());
129 unsigned int max_cpus = ms->smp.max_cpus;
130
131 if (cpu->env.core_id >= max_cpus) {
132 error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
133 ", maximum core-id: %d", cpu->env.core_id,
134 max_cpus - 1);
135 return false;
136 }
137
138 if (cpu_exists(cpu->env.core_id)) {
139 error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
140 ", it already exists", cpu->env.core_id);
141 return false;
142 }
143
144 /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
145 CPU(cpu)->cpu_index = cpu->env.core_id;
146 return true;
147 }
148
s390_cpu_finalize(Object * obj)149 void s390_cpu_finalize(Object *obj)
150 {
151 S390CPU *cpu = S390_CPU(obj);
152
153 timer_free(cpu->env.tod_timer);
154 timer_free(cpu->env.cpu_timer);
155
156 qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
157 g_free(cpu->irqstate);
158 }
159
160 static const struct SysemuCPUOps s390_sysemu_ops = {
161 .get_phys_page_debug = s390_cpu_get_phys_page_debug,
162 .get_crash_info = s390_cpu_get_crash_info,
163 .write_elf64_note = s390_cpu_write_elf64_note,
164 .legacy_vmsd = &vmstate_s390_cpu,
165 };
166
s390_cpu_class_init_sysemu(CPUClass * cc)167 void s390_cpu_class_init_sysemu(CPUClass *cc)
168 {
169 S390CPUClass *scc = S390_CPU_CLASS(cc);
170
171 scc->load_normal = s390_cpu_load_normal;
172 cc->sysemu_ops = &s390_sysemu_ops;
173 }
174
disabled_wait(CPUState * cpu)175 static bool disabled_wait(CPUState *cpu)
176 {
177 return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
178 (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
179 }
180
s390_count_running_cpus(void)181 static unsigned s390_count_running_cpus(void)
182 {
183 CPUState *cpu;
184 int nr_running = 0;
185
186 CPU_FOREACH(cpu) {
187 uint8_t state = S390_CPU(cpu)->env.cpu_state;
188 if (state == S390_CPU_STATE_OPERATING ||
189 state == S390_CPU_STATE_LOAD) {
190 if (!disabled_wait(cpu)) {
191 nr_running++;
192 }
193 }
194 }
195
196 return nr_running;
197 }
198
s390_cpu_halt(S390CPU * cpu)199 unsigned int s390_cpu_halt(S390CPU *cpu)
200 {
201 CPUState *cs = CPU(cpu);
202 trace_cpu_halt(cs->cpu_index);
203
204 if (!cs->halted) {
205 cs->halted = 1;
206 cs->exception_index = EXCP_HLT;
207 }
208
209 return s390_count_running_cpus();
210 }
211
s390_cpu_unhalt(S390CPU * cpu)212 void s390_cpu_unhalt(S390CPU *cpu)
213 {
214 CPUState *cs = CPU(cpu);
215 trace_cpu_unhalt(cs->cpu_index);
216
217 if (cs->halted) {
218 cs->halted = 0;
219 cs->exception_index = -1;
220 }
221 }
222
s390_cpu_set_state(uint8_t cpu_state,S390CPU * cpu)223 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
224 {
225 trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
226
227 switch (cpu_state) {
228 case S390_CPU_STATE_STOPPED:
229 case S390_CPU_STATE_CHECK_STOP:
230 /* halt the cpu for common infrastructure */
231 s390_cpu_halt(cpu);
232 break;
233 case S390_CPU_STATE_OPERATING:
234 case S390_CPU_STATE_LOAD:
235 /*
236 * Starting a CPU with a PSW WAIT bit set:
237 * KVM: handles this internally and triggers another WAIT exit.
238 * TCG: will actually try to continue to run. Don't unhalt, will
239 * be done when the CPU actually has work (an interrupt).
240 */
241 if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
242 s390_cpu_unhalt(cpu);
243 }
244 break;
245 default:
246 error_report("Requested CPU state is not a valid S390 CPU state: %u",
247 cpu_state);
248 exit(1);
249 }
250 if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
251 kvm_s390_set_cpu_state(cpu, cpu_state);
252 }
253 cpu->env.cpu_state = cpu_state;
254
255 return s390_count_running_cpus();
256 }
257
s390_set_memory_limit(uint64_t new_limit,uint64_t * hw_limit)258 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
259 {
260 if (kvm_enabled()) {
261 return kvm_s390_set_mem_limit(new_limit, hw_limit);
262 }
263 return 0;
264 }
265
s390_set_max_pagesize(uint64_t pagesize,Error ** errp)266 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
267 {
268 if (kvm_enabled()) {
269 kvm_s390_set_max_pagesize(pagesize, errp);
270 }
271 }
272
s390_cmma_reset(void)273 void s390_cmma_reset(void)
274 {
275 if (kvm_enabled()) {
276 kvm_s390_cmma_reset();
277 }
278 }
279
s390_assign_subch_ioeventfd(EventNotifier * notifier,uint32_t sch_id,int vq,bool assign)280 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
281 int vq, bool assign)
282 {
283 if (kvm_enabled()) {
284 return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
285 } else {
286 return 0;
287 }
288 }
289
s390_crypto_reset(void)290 void s390_crypto_reset(void)
291 {
292 if (kvm_enabled()) {
293 kvm_s390_crypto_reset();
294 }
295 }
296
s390_enable_css_support(S390CPU * cpu)297 void s390_enable_css_support(S390CPU *cpu)
298 {
299 if (kvm_enabled()) {
300 kvm_s390_enable_css_support(cpu);
301 }
302 }
303
s390_do_cpu_set_diag318(CPUState * cs,run_on_cpu_data arg)304 void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
305 {
306 if (kvm_enabled()) {
307 kvm_s390_set_diag318(cs, arg.host_ulong);
308 }
309 }
310
s390_cpu_topology_set_changed(bool changed)311 void s390_cpu_topology_set_changed(bool changed)
312 {
313 int ret;
314
315 if (kvm_enabled()) {
316 ret = kvm_s390_topology_set_mtcr(changed);
317 if (ret) {
318 error_report("Failed to set Modified Topology Change Report: %s",
319 strerror(-ret));
320 }
321 }
322 }
323