1 // SPDX-License-Identifier: GPL-2.0
3 * handling interprocessor communication
5 * Copyright IBM Corp. 2008, 2013
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 * Christian Ehrhardt <ehrhardt@de.ibm.com>
12 #include <linux/kvm.h>
13 #include <linux/kvm_host.h>
14 #include <linux/slab.h>
20 static int __sigp_sense(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
23 const bool stopped = kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_STOPPED);
27 ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
28 if (!stopped && !ext_call_pending)
29 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
31 *reg &= 0xffffffff00000000UL;
33 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
35 *reg |= SIGP_STATUS_STOPPED;
36 rc = SIGP_CC_STATUS_STORED;
39 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
44 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
45 struct kvm_vcpu *dst_vcpu)
47 struct kvm_s390_irq irq = {
48 .type = KVM_S390_INT_EMERGENCY,
49 .u.emerg.code = vcpu->vcpu_id,
53 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
55 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
58 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
61 static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
63 return __inject_sigp_emergency(vcpu, dst_vcpu);
66 static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
67 struct kvm_vcpu *dst_vcpu,
70 const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
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 */
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);
87 *reg &= 0xffffffff00000000UL;
88 *reg |= SIGP_STATUS_INCORRECT_STATE;
89 return SIGP_CC_STATUS_STORED;
93 static int __sigp_external_call(struct kvm_vcpu *vcpu,
94 struct kvm_vcpu *dst_vcpu, u64 *reg)
96 struct kvm_s390_irq irq = {
97 .type = KVM_S390_INT_EXTERNAL_CALL,
98 .u.extcall.code = vcpu->vcpu_id,
102 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
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",
112 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
115 static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
117 struct kvm_s390_irq irq = {
118 .type = KVM_S390_SIGP_STOP,
122 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
126 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
132 static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
133 struct kvm_vcpu *dst_vcpu, u64 *reg)
135 struct kvm_s390_irq irq = {
136 .type = KVM_S390_SIGP_STOP,
137 .u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
141 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
145 VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
151 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter,
156 bool all_stopped = true;
158 kvm_for_each_vcpu(i, v, vcpu->kvm) {
161 if (!is_vcpu_stopped(v))
165 *status_reg &= 0xffffffff00000000UL;
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;
173 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
174 u32 address, u64 *reg)
176 struct kvm_s390_irq irq = {
177 .type = KVM_S390_SIGP_SET_PREFIX,
178 .u.prefix.address = address & 0x7fffe000u,
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.
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;
193 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
195 *reg &= 0xffffffff00000000UL;
196 *reg |= SIGP_STATUS_INCORRECT_STATE;
197 return SIGP_CC_STATUS_STORED;
203 static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
204 struct kvm_vcpu *dst_vcpu,
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;
216 rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
218 *reg &= 0xffffffff00000000UL;
219 *reg |= SIGP_STATUS_INVALID_PARAMETER;
220 rc = SIGP_CC_STATUS_STORED;
225 static int __sigp_sense_running(struct kvm_vcpu *vcpu,
226 struct kvm_vcpu *dst_vcpu, u64 *reg)
230 if (!test_kvm_facility(vcpu->kvm, 9)) {
231 *reg &= 0xffffffff00000000UL;
232 *reg |= SIGP_STATUS_INVALID_ORDER;
233 return SIGP_CC_STATUS_STORED;
236 if (kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_RUNNING)) {
238 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
241 *reg &= 0xffffffff00000000UL;
242 *reg |= SIGP_STATUS_NOT_RUNNING;
243 rc = SIGP_CC_STATUS_STORED;
246 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
247 dst_vcpu->vcpu_id, rc);
252 static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
253 struct kvm_vcpu *dst_vcpu, u8 order_code)
255 struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
256 /* handle (RE)START in user space */
257 int rc = -EOPNOTSUPP;
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))
263 spin_unlock(&li->lock);
268 static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
269 struct kvm_vcpu *dst_vcpu, u8 order_code)
271 /* handle (INITIAL) CPU RESET in user space */
275 static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
276 struct kvm_vcpu *dst_vcpu)
278 /* handle unknown orders in user space */
282 static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
283 u16 cpu_addr, u32 parameter, u64 *status_reg)
286 struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
289 return SIGP_CC_NOT_OPERATIONAL;
292 * SIGP RESTART, SIGP STOP, and SIGP STOP AND STORE STATUS orders
293 * are processed asynchronously. Until the affected VCPU finishes
294 * its work and calls back into KVM to clear the (RESTART or STOP)
295 * interrupt, we need to return any new non-reset orders "busy".
297 * This is important because a single VCPU could issue:
298 * 1) SIGP STOP $DESTINATION
299 * 2) SIGP SENSE $DESTINATION
301 * If the SIGP SENSE would not be rejected as "busy", it could
302 * return an incorrect answer as to whether the VCPU is STOPPED
305 if (order_code != SIGP_INITIAL_CPU_RESET &&
306 order_code != SIGP_CPU_RESET) {
308 * Lockless check. Both SIGP STOP and SIGP (RE)START
309 * properly synchronize everything while processing
310 * their orders, while the guest cannot observe a
311 * difference when issuing other orders from two
314 if (kvm_s390_is_stop_irq_pending(dst_vcpu) ||
315 kvm_s390_is_restart_irq_pending(dst_vcpu))
319 switch (order_code) {
321 vcpu->stat.instruction_sigp_sense++;
322 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
324 case SIGP_EXTERNAL_CALL:
325 vcpu->stat.instruction_sigp_external_call++;
326 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
328 case SIGP_EMERGENCY_SIGNAL:
329 vcpu->stat.instruction_sigp_emergency++;
330 rc = __sigp_emergency(vcpu, dst_vcpu);
333 vcpu->stat.instruction_sigp_stop++;
334 rc = __sigp_stop(vcpu, dst_vcpu);
336 case SIGP_STOP_AND_STORE_STATUS:
337 vcpu->stat.instruction_sigp_stop_store_status++;
338 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
340 case SIGP_STORE_STATUS_AT_ADDRESS:
341 vcpu->stat.instruction_sigp_store_status++;
342 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
345 case SIGP_SET_PREFIX:
346 vcpu->stat.instruction_sigp_prefix++;
347 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
349 case SIGP_COND_EMERGENCY_SIGNAL:
350 vcpu->stat.instruction_sigp_cond_emergency++;
351 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
354 case SIGP_SENSE_RUNNING:
355 vcpu->stat.instruction_sigp_sense_running++;
356 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
359 vcpu->stat.instruction_sigp_start++;
360 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
363 vcpu->stat.instruction_sigp_restart++;
364 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
366 case SIGP_INITIAL_CPU_RESET:
367 vcpu->stat.instruction_sigp_init_cpu_reset++;
368 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
371 vcpu->stat.instruction_sigp_cpu_reset++;
372 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
375 vcpu->stat.instruction_sigp_unknown++;
376 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
379 if (rc == -EOPNOTSUPP)
381 "sigp order %u -> cpu %x: handled in user space",
382 order_code, dst_vcpu->vcpu_id);
387 static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
390 if (!vcpu->kvm->arch.user_sigp)
393 switch (order_code) {
395 case SIGP_EXTERNAL_CALL:
396 case SIGP_EMERGENCY_SIGNAL:
397 case SIGP_COND_EMERGENCY_SIGNAL:
398 case SIGP_SENSE_RUNNING:
400 /* update counters as we're directly dropping to user space */
402 vcpu->stat.instruction_sigp_stop++;
404 case SIGP_STOP_AND_STORE_STATUS:
405 vcpu->stat.instruction_sigp_stop_store_status++;
407 case SIGP_STORE_STATUS_AT_ADDRESS:
408 vcpu->stat.instruction_sigp_store_status++;
410 case SIGP_STORE_ADDITIONAL_STATUS:
411 vcpu->stat.instruction_sigp_store_adtl_status++;
413 case SIGP_SET_PREFIX:
414 vcpu->stat.instruction_sigp_prefix++;
417 vcpu->stat.instruction_sigp_start++;
420 vcpu->stat.instruction_sigp_restart++;
422 case SIGP_INITIAL_CPU_RESET:
423 vcpu->stat.instruction_sigp_init_cpu_reset++;
426 vcpu->stat.instruction_sigp_cpu_reset++;
429 vcpu->stat.instruction_sigp_unknown++;
431 VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
432 order_code, cpu_addr);
437 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
439 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
440 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
442 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
446 /* sigp in userspace can exit */
447 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
448 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
450 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
451 if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
455 parameter = vcpu->run->s.regs.gprs[r1];
457 parameter = vcpu->run->s.regs.gprs[r1 + 1];
459 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
460 switch (order_code) {
461 case SIGP_SET_ARCHITECTURE:
462 vcpu->stat.instruction_sigp_arch++;
463 rc = __sigp_set_arch(vcpu, parameter,
464 &vcpu->run->s.regs.gprs[r1]);
467 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
469 &vcpu->run->s.regs.gprs[r1]);
475 kvm_s390_set_psw_cc(vcpu, rc);
480 * Handle SIGP partial execution interception.
482 * This interception will occur at the source cpu when a source cpu sends an
483 * external call to a target cpu and the target cpu has the WAIT bit set in
484 * its cpuflags. Interception will occurr after the interrupt indicator bits at
485 * the target cpu have been set. All error cases will lead to instruction
486 * interception, therefore nothing is to be checked or prepared.
488 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
490 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
491 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
492 struct kvm_vcpu *dest_vcpu;
493 u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
495 trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
497 if (order_code == SIGP_EXTERNAL_CALL) {
498 dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
499 BUG_ON(dest_vcpu == NULL);
501 kvm_s390_vcpu_wakeup(dest_vcpu);
502 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);