2 * handling interprocessor communication
4 * Copyright IBM Corp. 2008, 2013
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
12 * Christian Ehrhardt <ehrhardt@de.ibm.com>
15 #include <linux/kvm.h>
16 #include <linux/kvm_host.h>
17 #include <linux/slab.h>
23 static int __sigp_sense(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
26 struct kvm_s390_local_interrupt *li;
31 li = &dst_vcpu->arch.local_int;
33 cpuflags = atomic_read(li->cpuflags);
34 ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
35 if (!(cpuflags & CPUSTAT_STOPPED) && !ext_call_pending)
36 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
38 *reg &= 0xffffffff00000000UL;
40 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
41 if (cpuflags & CPUSTAT_STOPPED)
42 *reg |= SIGP_STATUS_STOPPED;
43 rc = SIGP_CC_STATUS_STORED;
46 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
51 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
52 struct kvm_vcpu *dst_vcpu)
54 struct kvm_s390_irq irq = {
55 .type = KVM_S390_INT_EMERGENCY,
56 .u.emerg.code = vcpu->vcpu_id,
60 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
62 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
65 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
68 static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
70 return __inject_sigp_emergency(vcpu, dst_vcpu);
73 static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
74 struct kvm_vcpu *dst_vcpu,
77 const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
82 flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
83 psw = &dst_vcpu->arch.sie_block->gpsw;
84 p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
85 s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
87 /* Inject the emergency signal? */
88 if (!(flags & CPUSTAT_STOPPED)
89 || (psw->mask & psw_int_mask) != psw_int_mask
90 || ((flags & CPUSTAT_WAIT) && psw->addr != 0)
91 || (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) {
92 return __inject_sigp_emergency(vcpu, dst_vcpu);
94 *reg &= 0xffffffff00000000UL;
95 *reg |= SIGP_STATUS_INCORRECT_STATE;
96 return SIGP_CC_STATUS_STORED;
100 static int __sigp_external_call(struct kvm_vcpu *vcpu,
101 struct kvm_vcpu *dst_vcpu, u64 *reg)
103 struct kvm_s390_irq irq = {
104 .type = KVM_S390_INT_EXTERNAL_CALL,
105 .u.extcall.code = vcpu->vcpu_id,
109 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
111 *reg &= 0xffffffff00000000UL;
112 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
113 return SIGP_CC_STATUS_STORED;
114 } else if (rc == 0) {
115 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
119 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
122 static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
124 struct kvm_s390_irq irq = {
125 .type = KVM_S390_SIGP_STOP,
129 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
133 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
139 static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
140 struct kvm_vcpu *dst_vcpu, u64 *reg)
142 struct kvm_s390_irq irq = {
143 .type = KVM_S390_SIGP_STOP,
144 .u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
148 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
152 VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
158 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
164 switch (parameter & 0xff) {
166 rc = SIGP_CC_NOT_OPERATIONAL;
170 kvm_for_each_vcpu(i, v, vcpu->kvm) {
171 v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
172 kvm_clear_async_pf_completion_queue(v);
175 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
183 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
184 u32 address, u64 *reg)
186 struct kvm_s390_irq irq = {
187 .type = KVM_S390_SIGP_SET_PREFIX,
188 .u.prefix.address = address & 0x7fffe000u,
193 * Make sure the new value is valid memory. We only need to check the
194 * first page, since address is 8k aligned and memory pieces are always
195 * at least 1MB aligned and have at least a size of 1MB.
197 if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
198 *reg &= 0xffffffff00000000UL;
199 *reg |= SIGP_STATUS_INVALID_PARAMETER;
200 return SIGP_CC_STATUS_STORED;
203 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
205 *reg &= 0xffffffff00000000UL;
206 *reg |= SIGP_STATUS_INCORRECT_STATE;
207 return SIGP_CC_STATUS_STORED;
208 } else if (rc == 0) {
209 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x",
210 dst_vcpu->vcpu_id, irq.u.prefix.address);
216 static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
217 struct kvm_vcpu *dst_vcpu,
223 flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
224 if (!(flags & CPUSTAT_STOPPED)) {
225 *reg &= 0xffffffff00000000UL;
226 *reg |= SIGP_STATUS_INCORRECT_STATE;
227 return SIGP_CC_STATUS_STORED;
231 rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
233 *reg &= 0xffffffff00000000UL;
234 *reg |= SIGP_STATUS_INVALID_PARAMETER;
235 rc = SIGP_CC_STATUS_STORED;
240 static int __sigp_sense_running(struct kvm_vcpu *vcpu,
241 struct kvm_vcpu *dst_vcpu, u64 *reg)
243 struct kvm_s390_local_interrupt *li;
246 li = &dst_vcpu->arch.local_int;
247 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
249 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
252 *reg &= 0xffffffff00000000UL;
253 *reg |= SIGP_STATUS_NOT_RUNNING;
254 rc = SIGP_CC_STATUS_STORED;
257 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
258 dst_vcpu->vcpu_id, rc);
263 static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
264 struct kvm_vcpu *dst_vcpu, u8 order_code)
266 struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
267 /* handle (RE)START in user space */
268 int rc = -EOPNOTSUPP;
270 /* make sure we don't race with STOP irq injection */
271 spin_lock(&li->lock);
272 if (kvm_s390_is_stop_irq_pending(dst_vcpu))
274 spin_unlock(&li->lock);
279 static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
280 struct kvm_vcpu *dst_vcpu, u8 order_code)
282 /* handle (INITIAL) CPU RESET in user space */
286 static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
287 struct kvm_vcpu *dst_vcpu)
289 /* handle unknown orders in user space */
293 static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
294 u16 cpu_addr, u32 parameter, u64 *status_reg)
297 struct kvm_vcpu *dst_vcpu;
299 if (cpu_addr >= KVM_MAX_VCPUS)
300 return SIGP_CC_NOT_OPERATIONAL;
302 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
304 return SIGP_CC_NOT_OPERATIONAL;
306 switch (order_code) {
308 vcpu->stat.instruction_sigp_sense++;
309 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
311 case SIGP_EXTERNAL_CALL:
312 vcpu->stat.instruction_sigp_external_call++;
313 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
315 case SIGP_EMERGENCY_SIGNAL:
316 vcpu->stat.instruction_sigp_emergency++;
317 rc = __sigp_emergency(vcpu, dst_vcpu);
320 vcpu->stat.instruction_sigp_stop++;
321 rc = __sigp_stop(vcpu, dst_vcpu);
323 case SIGP_STOP_AND_STORE_STATUS:
324 vcpu->stat.instruction_sigp_stop_store_status++;
325 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
327 case SIGP_STORE_STATUS_AT_ADDRESS:
328 vcpu->stat.instruction_sigp_store_status++;
329 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
332 case SIGP_SET_PREFIX:
333 vcpu->stat.instruction_sigp_prefix++;
334 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
336 case SIGP_COND_EMERGENCY_SIGNAL:
337 vcpu->stat.instruction_sigp_cond_emergency++;
338 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
341 case SIGP_SENSE_RUNNING:
342 vcpu->stat.instruction_sigp_sense_running++;
343 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
346 vcpu->stat.instruction_sigp_start++;
347 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
350 vcpu->stat.instruction_sigp_restart++;
351 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
353 case SIGP_INITIAL_CPU_RESET:
354 vcpu->stat.instruction_sigp_init_cpu_reset++;
355 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
358 vcpu->stat.instruction_sigp_cpu_reset++;
359 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
362 vcpu->stat.instruction_sigp_unknown++;
363 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
366 if (rc == -EOPNOTSUPP)
368 "sigp order %u -> cpu %x: handled in user space",
369 order_code, dst_vcpu->vcpu_id);
374 static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code)
376 if (!vcpu->kvm->arch.user_sigp)
379 switch (order_code) {
381 case SIGP_EXTERNAL_CALL:
382 case SIGP_EMERGENCY_SIGNAL:
383 case SIGP_COND_EMERGENCY_SIGNAL:
384 case SIGP_SENSE_RUNNING:
386 /* update counters as we're directly dropping to user space */
388 vcpu->stat.instruction_sigp_stop++;
390 case SIGP_STOP_AND_STORE_STATUS:
391 vcpu->stat.instruction_sigp_stop_store_status++;
393 case SIGP_STORE_STATUS_AT_ADDRESS:
394 vcpu->stat.instruction_sigp_store_status++;
396 case SIGP_SET_PREFIX:
397 vcpu->stat.instruction_sigp_prefix++;
400 vcpu->stat.instruction_sigp_start++;
403 vcpu->stat.instruction_sigp_restart++;
405 case SIGP_INITIAL_CPU_RESET:
406 vcpu->stat.instruction_sigp_init_cpu_reset++;
409 vcpu->stat.instruction_sigp_cpu_reset++;
412 vcpu->stat.instruction_sigp_unknown++;
415 VCPU_EVENT(vcpu, 4, "sigp order %u: completely handled in user space",
421 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
423 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
424 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
426 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
430 /* sigp in userspace can exit */
431 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
432 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
434 order_code = kvm_s390_get_base_disp_rs(vcpu);
435 if (handle_sigp_order_in_user_space(vcpu, order_code))
439 parameter = vcpu->run->s.regs.gprs[r1];
441 parameter = vcpu->run->s.regs.gprs[r1 + 1];
443 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
444 switch (order_code) {
445 case SIGP_SET_ARCHITECTURE:
446 vcpu->stat.instruction_sigp_arch++;
447 rc = __sigp_set_arch(vcpu, parameter);
450 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
452 &vcpu->run->s.regs.gprs[r1]);
458 kvm_s390_set_psw_cc(vcpu, rc);
463 * Handle SIGP partial execution interception.
465 * This interception will occur at the source cpu when a source cpu sends an
466 * external call to a target cpu and the target cpu has the WAIT bit set in
467 * its cpuflags. Interception will occurr after the interrupt indicator bits at
468 * the target cpu have been set. All error cases will lead to instruction
469 * interception, therefore nothing is to be checked or prepared.
471 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
473 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
474 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
475 struct kvm_vcpu *dest_vcpu;
476 u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
478 trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
480 if (order_code == SIGP_EXTERNAL_CALL) {
481 dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
482 BUG_ON(dest_vcpu == NULL);
484 kvm_s390_vcpu_wakeup(dest_vcpu);
485 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);