1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/kvm.h>
16#include <linux/kvm_host.h>
17#include <linux/slab.h>
18#include "gaccess.h"
19#include "kvm-s390.h"
20
21
22#define SIGP_SENSE 0x01
23#define SIGP_EXTERNAL_CALL 0x02
24#define SIGP_EMERGENCY 0x03
25#define SIGP_START 0x04
26#define SIGP_STOP 0x05
27#define SIGP_RESTART 0x06
28#define SIGP_STOP_STORE_STATUS 0x09
29#define SIGP_INITIAL_CPU_RESET 0x0b
30#define SIGP_CPU_RESET 0x0c
31#define SIGP_SET_PREFIX 0x0d
32#define SIGP_STORE_STATUS_ADDR 0x0e
33#define SIGP_SET_ARCH 0x12
34#define SIGP_SENSE_RUNNING 0x15
35
36
37#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
38#define SIGP_STAT_NOT_RUNNING 0x00000400UL
39#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
40#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
41#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
42#define SIGP_STAT_STOPPED 0x00000040UL
43#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
44#define SIGP_STAT_CHECK_STOP 0x00000010UL
45#define SIGP_STAT_INOPERATIVE 0x00000004UL
46#define SIGP_STAT_INVALID_ORDER 0x00000002UL
47#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
48
49
50static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
51 unsigned long *reg)
52{
53 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
54 int rc;
55
56 if (cpu_addr >= KVM_MAX_VCPUS)
57 return 3;
58
59 spin_lock(&fi->lock);
60 if (fi->local_int[cpu_addr] == NULL)
61 rc = 3;
62 else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
63 & CPUSTAT_STOPPED)) {
64 *reg &= 0xffffffff00000000UL;
65 rc = 1;
66 } else {
67 *reg &= 0xffffffff00000000UL;
68 *reg |= SIGP_STAT_STOPPED;
69 rc = 1;
70 }
71 spin_unlock(&fi->lock);
72
73 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
74 return rc;
75}
76
77static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
78{
79 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
80 struct kvm_s390_local_interrupt *li;
81 struct kvm_s390_interrupt_info *inti;
82 int rc;
83
84 if (cpu_addr >= KVM_MAX_VCPUS)
85 return 3;
86
87 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
88 if (!inti)
89 return -ENOMEM;
90
91 inti->type = KVM_S390_INT_EMERGENCY;
92 inti->emerg.code = vcpu->vcpu_id;
93
94 spin_lock(&fi->lock);
95 li = fi->local_int[cpu_addr];
96 if (li == NULL) {
97 rc = 3;
98 kfree(inti);
99 goto unlock;
100 }
101 spin_lock_bh(&li->lock);
102 list_add_tail(&inti->list, &li->list);
103 atomic_set(&li->active, 1);
104 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
105 if (waitqueue_active(&li->wq))
106 wake_up_interruptible(&li->wq);
107 spin_unlock_bh(&li->lock);
108 rc = 0;
109 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
110unlock:
111 spin_unlock(&fi->lock);
112 return rc;
113}
114
115static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
116{
117 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
118 struct kvm_s390_local_interrupt *li;
119 struct kvm_s390_interrupt_info *inti;
120 int rc;
121
122 if (cpu_addr >= KVM_MAX_VCPUS)
123 return 3;
124
125 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
126 if (!inti)
127 return -ENOMEM;
128
129 inti->type = KVM_S390_INT_EXTERNAL_CALL;
130 inti->extcall.code = vcpu->vcpu_id;
131
132 spin_lock(&fi->lock);
133 li = fi->local_int[cpu_addr];
134 if (li == NULL) {
135 rc = 3;
136 kfree(inti);
137 goto unlock;
138 }
139 spin_lock_bh(&li->lock);
140 list_add_tail(&inti->list, &li->list);
141 atomic_set(&li->active, 1);
142 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
143 if (waitqueue_active(&li->wq))
144 wake_up_interruptible(&li->wq);
145 spin_unlock_bh(&li->lock);
146 rc = 0;
147 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
148unlock:
149 spin_unlock(&fi->lock);
150 return rc;
151}
152
153static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
154{
155 struct kvm_s390_interrupt_info *inti;
156
157 inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
158 if (!inti)
159 return -ENOMEM;
160 inti->type = KVM_S390_SIGP_STOP;
161
162 spin_lock_bh(&li->lock);
163 list_add_tail(&inti->list, &li->list);
164 atomic_set(&li->active, 1);
165 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
166 li->action_bits |= action;
167 if (waitqueue_active(&li->wq))
168 wake_up_interruptible(&li->wq);
169 spin_unlock_bh(&li->lock);
170
171 return 0;
172}
173
174static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
175{
176 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
177 struct kvm_s390_local_interrupt *li;
178 int rc;
179
180 if (cpu_addr >= KVM_MAX_VCPUS)
181 return 3;
182
183 spin_lock(&fi->lock);
184 li = fi->local_int[cpu_addr];
185 if (li == NULL) {
186 rc = 3;
187 goto unlock;
188 }
189
190 rc = __inject_sigp_stop(li, action);
191
192unlock:
193 spin_unlock(&fi->lock);
194 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
195 return rc;
196}
197
198int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
199{
200 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
201 return __inject_sigp_stop(li, action);
202}
203
204static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
205{
206 int rc;
207
208 switch (parameter & 0xff) {
209 case 0:
210 rc = 3;
211 break;
212 case 1:
213 case 2:
214 rc = 0;
215 break;
216 default:
217 rc = -EOPNOTSUPP;
218 }
219 return rc;
220}
221
222static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
223 unsigned long *reg)
224{
225 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
226 struct kvm_s390_local_interrupt *li = NULL;
227 struct kvm_s390_interrupt_info *inti;
228 int rc;
229 u8 tmp;
230
231
232 address = address & 0x7fffe000u;
233 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
234 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
235 *reg |= SIGP_STAT_INVALID_PARAMETER;
236 return 1;
237 }
238
239 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
240 if (!inti)
241 return 2;
242
243 spin_lock(&fi->lock);
244 if (cpu_addr < KVM_MAX_VCPUS)
245 li = fi->local_int[cpu_addr];
246
247 if (li == NULL) {
248 rc = 1;
249 *reg &= SIGP_STAT_INCORRECT_STATE;
250 kfree(inti);
251 goto out_fi;
252 }
253
254 spin_lock_bh(&li->lock);
255
256 if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
257 rc = 1;
258 *reg &= SIGP_STAT_INCORRECT_STATE;
259 kfree(inti);
260 goto out_li;
261 }
262
263 inti->type = KVM_S390_SIGP_SET_PREFIX;
264 inti->prefix.address = address;
265
266 list_add_tail(&inti->list, &li->list);
267 atomic_set(&li->active, 1);
268 if (waitqueue_active(&li->wq))
269 wake_up_interruptible(&li->wq);
270 rc = 0;
271
272 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
273out_li:
274 spin_unlock_bh(&li->lock);
275out_fi:
276 spin_unlock(&fi->lock);
277 return rc;
278}
279
280static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
281 unsigned long *reg)
282{
283 int rc;
284 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
285
286 if (cpu_addr >= KVM_MAX_VCPUS)
287 return 3;
288
289 spin_lock(&fi->lock);
290 if (fi->local_int[cpu_addr] == NULL)
291 rc = 3;
292 else {
293 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
294 & CPUSTAT_RUNNING) {
295
296 rc = 1;
297 } else {
298
299 *reg &= 0xffffffff00000000UL;
300 *reg |= SIGP_STAT_NOT_RUNNING;
301 rc = 0;
302 }
303 }
304 spin_unlock(&fi->lock);
305
306 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
307 rc);
308
309 return rc;
310}
311
312int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
313{
314 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
315 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
316 int base2 = vcpu->arch.sie_block->ipb >> 28;
317 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
318 u32 parameter;
319 u16 cpu_addr = vcpu->arch.guest_gprs[r3];
320 u8 order_code;
321 int rc;
322
323
324 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
325 return kvm_s390_inject_program_int(vcpu,
326 PGM_PRIVILEGED_OPERATION);
327
328 order_code = disp2;
329 if (base2)
330 order_code += vcpu->arch.guest_gprs[base2];
331
332 if (r1 % 2)
333 parameter = vcpu->arch.guest_gprs[r1];
334 else
335 parameter = vcpu->arch.guest_gprs[r1 + 1];
336
337 switch (order_code) {
338 case SIGP_SENSE:
339 vcpu->stat.instruction_sigp_sense++;
340 rc = __sigp_sense(vcpu, cpu_addr,
341 &vcpu->arch.guest_gprs[r1]);
342 break;
343 case SIGP_EXTERNAL_CALL:
344 vcpu->stat.instruction_sigp_external_call++;
345 rc = __sigp_external_call(vcpu, cpu_addr);
346 break;
347 case SIGP_EMERGENCY:
348 vcpu->stat.instruction_sigp_emergency++;
349 rc = __sigp_emergency(vcpu, cpu_addr);
350 break;
351 case SIGP_STOP:
352 vcpu->stat.instruction_sigp_stop++;
353 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
354 break;
355 case SIGP_STOP_STORE_STATUS:
356 vcpu->stat.instruction_sigp_stop++;
357 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP);
358 break;
359 case SIGP_SET_ARCH:
360 vcpu->stat.instruction_sigp_arch++;
361 rc = __sigp_set_arch(vcpu, parameter);
362 break;
363 case SIGP_SET_PREFIX:
364 vcpu->stat.instruction_sigp_prefix++;
365 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
366 &vcpu->arch.guest_gprs[r1]);
367 break;
368 case SIGP_SENSE_RUNNING:
369 vcpu->stat.instruction_sigp_sense_running++;
370 rc = __sigp_sense_running(vcpu, cpu_addr,
371 &vcpu->arch.guest_gprs[r1]);
372 break;
373 case SIGP_RESTART:
374 vcpu->stat.instruction_sigp_restart++;
375
376 default:
377 return -EOPNOTSUPP;
378 }
379
380 if (rc < 0)
381 return rc;
382
383 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
384 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
385 return 0;
386}
387
