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 struct kvm_s390_local_interrupt *li;
28 li = &dst_vcpu->arch.local_int;
30 cpuflags = atomic_read(li->cpuflags);
31 ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
32 if (!(cpuflags & CPUSTAT_STOPPED) && !ext_call_pending)
33 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
35 *reg &= 0xffffffff00000000UL;
37 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
38 if (cpuflags & CPUSTAT_STOPPED)
39 *reg |= SIGP_STATUS_STOPPED;
40 rc = SIGP_CC_STATUS_STORED;
43 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
48 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
49 struct kvm_vcpu *dst_vcpu)
51 struct kvm_s390_irq irq = {
52 .type = KVM_S390_INT_EMERGENCY,
53 .u.emerg.code = vcpu->vcpu_id,
57 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
59 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
62 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
65 static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
67 return __inject_sigp_emergency(vcpu, dst_vcpu);
70 static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
71 struct kvm_vcpu *dst_vcpu,
74 const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
79 idle = is_vcpu_idle(vcpu);
80 psw = &dst_vcpu->arch.sie_block->gpsw;
81 p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
82 s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
84 /* Inject the emergency signal? */
85 if (!is_vcpu_stopped(vcpu)
86 || (psw->mask & psw_int_mask) != psw_int_mask
87 || (idle && psw->addr != 0)
88 || (!idle && (asn == p_asn || asn == s_asn))) {
89 return __inject_sigp_emergency(vcpu, dst_vcpu);
91 *reg &= 0xffffffff00000000UL;
92 *reg |= SIGP_STATUS_INCORRECT_STATE;
93 return SIGP_CC_STATUS_STORED;
97 static int __sigp_external_call(struct kvm_vcpu *vcpu,
98 struct kvm_vcpu *dst_vcpu, u64 *reg)
100 struct kvm_s390_irq irq = {
101 .type = KVM_S390_INT_EXTERNAL_CALL,
102 .u.extcall.code = vcpu->vcpu_id,
106 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
108 *reg &= 0xffffffff00000000UL;
109 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
110 return SIGP_CC_STATUS_STORED;
111 } else if (rc == 0) {
112 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
116 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
119 static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
121 struct kvm_s390_irq irq = {
122 .type = KVM_S390_SIGP_STOP,
126 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
130 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
136 static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
137 struct kvm_vcpu *dst_vcpu, u64 *reg)
139 struct kvm_s390_irq irq = {
140 .type = KVM_S390_SIGP_STOP,
141 .u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
145 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
149 VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
155 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter,
160 bool all_stopped = true;
162 kvm_for_each_vcpu(i, v, vcpu->kvm) {
165 if (!is_vcpu_stopped(v))
169 *status_reg &= 0xffffffff00000000UL;
171 /* Reject set arch order, with czam we're always in z/Arch mode. */
172 *status_reg |= (all_stopped ? SIGP_STATUS_INVALID_PARAMETER :
173 SIGP_STATUS_INCORRECT_STATE);
174 return SIGP_CC_STATUS_STORED;
177 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
178 u32 address, u64 *reg)
180 struct kvm_s390_irq irq = {
181 .type = KVM_S390_SIGP_SET_PREFIX,
182 .u.prefix.address = address & 0x7fffe000u,
187 * Make sure the new value is valid memory. We only need to check the
188 * first page, since address is 8k aligned and memory pieces are always
189 * at least 1MB aligned and have at least a size of 1MB.
191 if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
192 *reg &= 0xffffffff00000000UL;
193 *reg |= SIGP_STATUS_INVALID_PARAMETER;
194 return SIGP_CC_STATUS_STORED;
197 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
199 *reg &= 0xffffffff00000000UL;
200 *reg |= SIGP_STATUS_INCORRECT_STATE;
201 return SIGP_CC_STATUS_STORED;
207 static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
208 struct kvm_vcpu *dst_vcpu,
214 flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
215 if (!(flags & CPUSTAT_STOPPED)) {
216 *reg &= 0xffffffff00000000UL;
217 *reg |= SIGP_STATUS_INCORRECT_STATE;
218 return SIGP_CC_STATUS_STORED;
222 rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
224 *reg &= 0xffffffff00000000UL;
225 *reg |= SIGP_STATUS_INVALID_PARAMETER;
226 rc = SIGP_CC_STATUS_STORED;
231 static int __sigp_sense_running(struct kvm_vcpu *vcpu,
232 struct kvm_vcpu *dst_vcpu, u64 *reg)
234 struct kvm_s390_local_interrupt *li;
237 if (!test_kvm_facility(vcpu->kvm, 9)) {
238 *reg &= 0xffffffff00000000UL;
239 *reg |= SIGP_STATUS_INVALID_ORDER;
240 return SIGP_CC_STATUS_STORED;
243 li = &dst_vcpu->arch.local_int;
244 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
246 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
249 *reg &= 0xffffffff00000000UL;
250 *reg |= SIGP_STATUS_NOT_RUNNING;
251 rc = SIGP_CC_STATUS_STORED;
254 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
255 dst_vcpu->vcpu_id, rc);
260 static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
261 struct kvm_vcpu *dst_vcpu, u8 order_code)
263 struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
264 /* handle (RE)START in user space */
265 int rc = -EOPNOTSUPP;
267 /* make sure we don't race with STOP irq injection */
268 spin_lock(&li->lock);
269 if (kvm_s390_is_stop_irq_pending(dst_vcpu))
271 spin_unlock(&li->lock);
276 static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
277 struct kvm_vcpu *dst_vcpu, u8 order_code)
279 /* handle (INITIAL) CPU RESET in user space */
283 static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
284 struct kvm_vcpu *dst_vcpu)
286 /* handle unknown orders in user space */
290 static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
291 u16 cpu_addr, u32 parameter, u64 *status_reg)
294 struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
297 return SIGP_CC_NOT_OPERATIONAL;
299 switch (order_code) {
301 vcpu->stat.instruction_sigp_sense++;
302 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
304 case SIGP_EXTERNAL_CALL:
305 vcpu->stat.instruction_sigp_external_call++;
306 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
308 case SIGP_EMERGENCY_SIGNAL:
309 vcpu->stat.instruction_sigp_emergency++;
310 rc = __sigp_emergency(vcpu, dst_vcpu);
313 vcpu->stat.instruction_sigp_stop++;
314 rc = __sigp_stop(vcpu, dst_vcpu);
316 case SIGP_STOP_AND_STORE_STATUS:
317 vcpu->stat.instruction_sigp_stop_store_status++;
318 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
320 case SIGP_STORE_STATUS_AT_ADDRESS:
321 vcpu->stat.instruction_sigp_store_status++;
322 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
325 case SIGP_SET_PREFIX:
326 vcpu->stat.instruction_sigp_prefix++;
327 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
329 case SIGP_COND_EMERGENCY_SIGNAL:
330 vcpu->stat.instruction_sigp_cond_emergency++;
331 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
334 case SIGP_SENSE_RUNNING:
335 vcpu->stat.instruction_sigp_sense_running++;
336 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
339 vcpu->stat.instruction_sigp_start++;
340 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
343 vcpu->stat.instruction_sigp_restart++;
344 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
346 case SIGP_INITIAL_CPU_RESET:
347 vcpu->stat.instruction_sigp_init_cpu_reset++;
348 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
351 vcpu->stat.instruction_sigp_cpu_reset++;
352 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
355 vcpu->stat.instruction_sigp_unknown++;
356 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
359 if (rc == -EOPNOTSUPP)
361 "sigp order %u -> cpu %x: handled in user space",
362 order_code, dst_vcpu->vcpu_id);
367 static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
370 if (!vcpu->kvm->arch.user_sigp)
373 switch (order_code) {
375 case SIGP_EXTERNAL_CALL:
376 case SIGP_EMERGENCY_SIGNAL:
377 case SIGP_COND_EMERGENCY_SIGNAL:
378 case SIGP_SENSE_RUNNING:
380 /* update counters as we're directly dropping to user space */
382 vcpu->stat.instruction_sigp_stop++;
384 case SIGP_STOP_AND_STORE_STATUS:
385 vcpu->stat.instruction_sigp_stop_store_status++;
387 case SIGP_STORE_STATUS_AT_ADDRESS:
388 vcpu->stat.instruction_sigp_store_status++;
390 case SIGP_STORE_ADDITIONAL_STATUS:
391 vcpu->stat.instruction_sigp_store_adtl_status++;
393 case SIGP_SET_PREFIX:
394 vcpu->stat.instruction_sigp_prefix++;
397 vcpu->stat.instruction_sigp_start++;
400 vcpu->stat.instruction_sigp_restart++;
402 case SIGP_INITIAL_CPU_RESET:
403 vcpu->stat.instruction_sigp_init_cpu_reset++;
406 vcpu->stat.instruction_sigp_cpu_reset++;
409 vcpu->stat.instruction_sigp_unknown++;
411 VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
412 order_code, cpu_addr);
417 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
419 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
420 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
422 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
426 /* sigp in userspace can exit */
427 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
428 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
430 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
431 if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
435 parameter = vcpu->run->s.regs.gprs[r1];
437 parameter = vcpu->run->s.regs.gprs[r1 + 1];
439 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
440 switch (order_code) {
441 case SIGP_SET_ARCHITECTURE:
442 vcpu->stat.instruction_sigp_arch++;
443 rc = __sigp_set_arch(vcpu, parameter,
444 &vcpu->run->s.regs.gprs[r1]);
447 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
449 &vcpu->run->s.regs.gprs[r1]);
455 kvm_s390_set_psw_cc(vcpu, rc);
460 * Handle SIGP partial execution interception.
462 * This interception will occur at the source cpu when a source cpu sends an
463 * external call to a target cpu and the target cpu has the WAIT bit set in
464 * its cpuflags. Interception will occurr after the interrupt indicator bits at
465 * the target cpu have been set. All error cases will lead to instruction
466 * interception, therefore nothing is to be checked or prepared.
468 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
470 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
471 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
472 struct kvm_vcpu *dest_vcpu;
473 u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
475 trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
477 if (order_code == SIGP_EXTERNAL_CALL) {
478 dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
479 BUG_ON(dest_vcpu == NULL);
481 kvm_s390_vcpu_wakeup(dest_vcpu);
482 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);