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Linux/arch/s390/kvm/sigp.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * handling interprocessor communication
  4  *
  5  * Copyright IBM Corp. 2008, 2013
  6  *
  7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  8  *               Christian Borntraeger <borntraeger@de.ibm.com>
  9  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
 10  */
 11 
 12 #include <linux/kvm.h>
 13 #include <linux/kvm_host.h>
 14 #include <linux/slab.h>
 15 #include <asm/sigp.h>
 16 #include "gaccess.h"
 17 #include "kvm-s390.h"
 18 #include "trace.h"
 19 
 20 static int __sigp_sense(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
 21                         u64 *reg)
 22 {
 23         const bool stopped = kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_STOPPED);
 24         int rc;
 25         int ext_call_pending;
 26 
 27         ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
 28         if (!stopped && !ext_call_pending)
 29                 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
 30         else {
 31                 *reg &= 0xffffffff00000000UL;
 32                 if (ext_call_pending)
 33                         *reg |= SIGP_STATUS_EXT_CALL_PENDING;
 34                 if (stopped)
 35                         *reg |= SIGP_STATUS_STOPPED;
 36                 rc = SIGP_CC_STATUS_STORED;
 37         }
 38 
 39         VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
 40                    rc);
 41         return rc;
 42 }
 43 
 44 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
 45                                     struct kvm_vcpu *dst_vcpu)
 46 {
 47         struct kvm_s390_irq irq = {
 48                 .type = KVM_S390_INT_EMERGENCY,
 49                 .u.emerg.code = vcpu->vcpu_id,
 50         };
 51         int rc = 0;
 52 
 53         rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
 54         if (!rc)
 55                 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
 56                            dst_vcpu->vcpu_id);
 57 
 58         return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
 59 }
 60 
 61 static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
 62 {
 63         return __inject_sigp_emergency(vcpu, dst_vcpu);
 64 }
 65 
 66 static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
 67                                         struct kvm_vcpu *dst_vcpu,
 68                                         u16 asn, u64 *reg)
 69 {
 70         const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
 71         u16 p_asn, s_asn;
 72         psw_t *psw;
 73         bool idle;
 74 
 75         idle = is_vcpu_idle(vcpu);
 76         psw = &dst_vcpu->arch.sie_block->gpsw;
 77         p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff;  /* Primary ASN */
 78         s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff;  /* Secondary ASN */
 79 
 80         /* Inject the emergency signal? */
 81         if (!is_vcpu_stopped(vcpu)
 82             || (psw->mask & psw_int_mask) != psw_int_mask
 83             || (idle && psw->addr != 0)
 84             || (!idle && (asn == p_asn || asn == s_asn))) {
 85                 return __inject_sigp_emergency(vcpu, dst_vcpu);
 86         } else {
 87                 *reg &= 0xffffffff00000000UL;
 88                 *reg |= SIGP_STATUS_INCORRECT_STATE;
 89                 return SIGP_CC_STATUS_STORED;
 90         }
 91 }
 92 
 93 static int __sigp_external_call(struct kvm_vcpu *vcpu,
 94                                 struct kvm_vcpu *dst_vcpu, u64 *reg)
 95 {
 96         struct kvm_s390_irq irq = {
 97                 .type = KVM_S390_INT_EXTERNAL_CALL,
 98                 .u.extcall.code = vcpu->vcpu_id,
 99         };
100         int rc;
101 
102         rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
103         if (rc == -EBUSY) {
104                 *reg &= 0xffffffff00000000UL;
105                 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
106                 return SIGP_CC_STATUS_STORED;
107         } else if (rc == 0) {
108                 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
109                            dst_vcpu->vcpu_id);
110         }
111 
112         return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
113 }
114 
115 static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
116 {
117         struct kvm_s390_irq irq = {
118                 .type = KVM_S390_SIGP_STOP,
119         };
120         int rc;
121 
122         rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
123         if (rc == -EBUSY)
124                 rc = SIGP_CC_BUSY;
125         else if (rc == 0)
126                 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
127                            dst_vcpu->vcpu_id);
128 
129         return rc;
130 }
131 
132 static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
133                                         struct kvm_vcpu *dst_vcpu, u64 *reg)
134 {
135         struct kvm_s390_irq irq = {
136                 .type = KVM_S390_SIGP_STOP,
137                 .u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
138         };
139         int rc;
140 
141         rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
142         if (rc == -EBUSY)
143                 rc = SIGP_CC_BUSY;
144         else if (rc == 0)
145                 VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
146                            dst_vcpu->vcpu_id);
147 
148         return rc;
149 }
150 
151 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter,
152                            u64 *status_reg)
153 {
154         unsigned int i;
155         struct kvm_vcpu *v;
156         bool all_stopped = true;
157 
158         kvm_for_each_vcpu(i, v, vcpu->kvm) {
159                 if (v == vcpu)
160                         continue;
161                 if (!is_vcpu_stopped(v))
162                         all_stopped = false;
163         }
164 
165         *status_reg &= 0xffffffff00000000UL;
166 
167         /* Reject set arch order, with czam we're always in z/Arch mode. */
168         *status_reg |= (all_stopped ? SIGP_STATUS_INVALID_PARAMETER :
169                                         SIGP_STATUS_INCORRECT_STATE);
170         return SIGP_CC_STATUS_STORED;
171 }
172 
173 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
174                              u32 address, u64 *reg)
175 {
176         struct kvm_s390_irq irq = {
177                 .type = KVM_S390_SIGP_SET_PREFIX,
178                 .u.prefix.address = address & 0x7fffe000u,
179         };
180         int rc;
181 
182         /*
183          * Make sure the new value is valid memory. We only need to check the
184          * first page, since address is 8k aligned and memory pieces are always
185          * at least 1MB aligned and have at least a size of 1MB.
186          */
187         if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
188                 *reg &= 0xffffffff00000000UL;
189                 *reg |= SIGP_STATUS_INVALID_PARAMETER;
190                 return SIGP_CC_STATUS_STORED;
191         }
192 
193         rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
194         if (rc == -EBUSY) {
195                 *reg &= 0xffffffff00000000UL;
196                 *reg |= SIGP_STATUS_INCORRECT_STATE;
197                 return SIGP_CC_STATUS_STORED;
198         }
199 
200         return rc;
201 }
202 
203 static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
204                                        struct kvm_vcpu *dst_vcpu,
205                                        u32 addr, u64 *reg)
206 {
207         int rc;
208 
209         if (!kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_STOPPED)) {
210                 *reg &= 0xffffffff00000000UL;
211                 *reg |= SIGP_STATUS_INCORRECT_STATE;
212                 return SIGP_CC_STATUS_STORED;
213         }
214 
215         addr &= 0x7ffffe00;
216         rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
217         if (rc == -EFAULT) {
218                 *reg &= 0xffffffff00000000UL;
219                 *reg |= SIGP_STATUS_INVALID_PARAMETER;
220                 rc = SIGP_CC_STATUS_STORED;
221         }
222         return rc;
223 }
224 
225 static int __sigp_sense_running(struct kvm_vcpu *vcpu,
226                                 struct kvm_vcpu *dst_vcpu, u64 *reg)
227 {
228         int rc;
229 
230         if (!test_kvm_facility(vcpu->kvm, 9)) {
231                 *reg &= 0xffffffff00000000UL;
232                 *reg |= SIGP_STATUS_INVALID_ORDER;
233                 return SIGP_CC_STATUS_STORED;
234         }
235 
236         if (kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_RUNNING)) {
237                 /* running */
238                 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
239         } else {
240                 /* not running */
241                 *reg &= 0xffffffff00000000UL;
242                 *reg |= SIGP_STATUS_NOT_RUNNING;
243                 rc = SIGP_CC_STATUS_STORED;
244         }
245 
246         VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
247                    dst_vcpu->vcpu_id, rc);
248 
249         return rc;
250 }
251 
252 static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
253                                    struct kvm_vcpu *dst_vcpu, u8 order_code)
254 {
255         struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
256         /* handle (RE)START in user space */
257         int rc = -EOPNOTSUPP;
258 
259         /* make sure we don't race with STOP irq injection */
260         spin_lock(&li->lock);
261         if (kvm_s390_is_stop_irq_pending(dst_vcpu))
262                 rc = SIGP_CC_BUSY;
263         spin_unlock(&li->lock);
264 
265         return rc;
266 }
267 
268 static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
269                                     struct kvm_vcpu *dst_vcpu, u8 order_code)
270 {
271         /* handle (INITIAL) CPU RESET in user space */
272         return -EOPNOTSUPP;
273 }
274 
275 static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
276                                   struct kvm_vcpu *dst_vcpu)
277 {
278         /* handle unknown orders in user space */
279         return -EOPNOTSUPP;
280 }
281 
282 static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
283                            u16 cpu_addr, u32 parameter, u64 *status_reg)
284 {
285         int rc;
286         struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
287 
288         if (!dst_vcpu)
289                 return SIGP_CC_NOT_OPERATIONAL;
290 
291         switch (order_code) {
292         case SIGP_SENSE:
293                 vcpu->stat.instruction_sigp_sense++;
294                 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
295                 break;
296         case SIGP_EXTERNAL_CALL:
297                 vcpu->stat.instruction_sigp_external_call++;
298                 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
299                 break;
300         case SIGP_EMERGENCY_SIGNAL:
301                 vcpu->stat.instruction_sigp_emergency++;
302                 rc = __sigp_emergency(vcpu, dst_vcpu);
303                 break;
304         case SIGP_STOP:
305                 vcpu->stat.instruction_sigp_stop++;
306                 rc = __sigp_stop(vcpu, dst_vcpu);
307                 break;
308         case SIGP_STOP_AND_STORE_STATUS:
309                 vcpu->stat.instruction_sigp_stop_store_status++;
310                 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
311                 break;
312         case SIGP_STORE_STATUS_AT_ADDRESS:
313                 vcpu->stat.instruction_sigp_store_status++;
314                 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
315                                                  status_reg);
316                 break;
317         case SIGP_SET_PREFIX:
318                 vcpu->stat.instruction_sigp_prefix++;
319                 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
320                 break;
321         case SIGP_COND_EMERGENCY_SIGNAL:
322                 vcpu->stat.instruction_sigp_cond_emergency++;
323                 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
324                                                   status_reg);
325                 break;
326         case SIGP_SENSE_RUNNING:
327                 vcpu->stat.instruction_sigp_sense_running++;
328                 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
329                 break;
330         case SIGP_START:
331                 vcpu->stat.instruction_sigp_start++;
332                 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
333                 break;
334         case SIGP_RESTART:
335                 vcpu->stat.instruction_sigp_restart++;
336                 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
337                 break;
338         case SIGP_INITIAL_CPU_RESET:
339                 vcpu->stat.instruction_sigp_init_cpu_reset++;
340                 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
341                 break;
342         case SIGP_CPU_RESET:
343                 vcpu->stat.instruction_sigp_cpu_reset++;
344                 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
345                 break;
346         default:
347                 vcpu->stat.instruction_sigp_unknown++;
348                 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
349         }
350 
351         if (rc == -EOPNOTSUPP)
352                 VCPU_EVENT(vcpu, 4,
353                            "sigp order %u -> cpu %x: handled in user space",
354                            order_code, dst_vcpu->vcpu_id);
355 
356         return rc;
357 }
358 
359 static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
360                                            u16 cpu_addr)
361 {
362         if (!vcpu->kvm->arch.user_sigp)
363                 return 0;
364 
365         switch (order_code) {
366         case SIGP_SENSE:
367         case SIGP_EXTERNAL_CALL:
368         case SIGP_EMERGENCY_SIGNAL:
369         case SIGP_COND_EMERGENCY_SIGNAL:
370         case SIGP_SENSE_RUNNING:
371                 return 0;
372         /* update counters as we're directly dropping to user space */
373         case SIGP_STOP:
374                 vcpu->stat.instruction_sigp_stop++;
375                 break;
376         case SIGP_STOP_AND_STORE_STATUS:
377                 vcpu->stat.instruction_sigp_stop_store_status++;
378                 break;
379         case SIGP_STORE_STATUS_AT_ADDRESS:
380                 vcpu->stat.instruction_sigp_store_status++;
381                 break;
382         case SIGP_STORE_ADDITIONAL_STATUS:
383                 vcpu->stat.instruction_sigp_store_adtl_status++;
384                 break;
385         case SIGP_SET_PREFIX:
386                 vcpu->stat.instruction_sigp_prefix++;
387                 break;
388         case SIGP_START:
389                 vcpu->stat.instruction_sigp_start++;
390                 break;
391         case SIGP_RESTART:
392                 vcpu->stat.instruction_sigp_restart++;
393                 break;
394         case SIGP_INITIAL_CPU_RESET:
395                 vcpu->stat.instruction_sigp_init_cpu_reset++;
396                 break;
397         case SIGP_CPU_RESET:
398                 vcpu->stat.instruction_sigp_cpu_reset++;
399                 break;
400         default:
401                 vcpu->stat.instruction_sigp_unknown++;
402         }
403         VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
404                    order_code, cpu_addr);
405 
406         return 1;
407 }
408 
409 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
410 {
411         int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
412         int r3 = vcpu->arch.sie_block->ipa & 0x000f;
413         u32 parameter;
414         u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
415         u8 order_code;
416         int rc;
417 
418         /* sigp in userspace can exit */
419         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
420                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
421 
422         order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
423         if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
424                 return -EOPNOTSUPP;
425 
426         if (r1 % 2)
427                 parameter = vcpu->run->s.regs.gprs[r1];
428         else
429                 parameter = vcpu->run->s.regs.gprs[r1 + 1];
430 
431         trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
432         switch (order_code) {
433         case SIGP_SET_ARCHITECTURE:
434                 vcpu->stat.instruction_sigp_arch++;
435                 rc = __sigp_set_arch(vcpu, parameter,
436                                      &vcpu->run->s.regs.gprs[r1]);
437                 break;
438         default:
439                 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
440                                      parameter,
441                                      &vcpu->run->s.regs.gprs[r1]);
442         }
443 
444         if (rc < 0)
445                 return rc;
446 
447         kvm_s390_set_psw_cc(vcpu, rc);
448         return 0;
449 }
450 
451 /*
452  * Handle SIGP partial execution interception.
453  *
454  * This interception will occur at the source cpu when a source cpu sends an
455  * external call to a target cpu and the target cpu has the WAIT bit set in
456  * its cpuflags. Interception will occurr after the interrupt indicator bits at
457  * the target cpu have been set. All error cases will lead to instruction
458  * interception, therefore nothing is to be checked or prepared.
459  */
460 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
461 {
462         int r3 = vcpu->arch.sie_block->ipa & 0x000f;
463         u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
464         struct kvm_vcpu *dest_vcpu;
465         u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
466 
467         trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
468 
469         if (order_code == SIGP_EXTERNAL_CALL) {
470                 dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
471                 BUG_ON(dest_vcpu == NULL);
472 
473                 kvm_s390_vcpu_wakeup(dest_vcpu);
474                 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
475                 return 0;
476         }
477 
478         return -EOPNOTSUPP;
479 }
480 

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