2 * handling interprocessor communication
4 * Copyright IBM Corp. 2008, 2009
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, u16 cpu_addr,
26 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
29 if (cpu_addr >= KVM_MAX_VCPUS)
30 return SIGP_CC_NOT_OPERATIONAL;
33 if (fi->local_int[cpu_addr] == NULL)
34 rc = SIGP_CC_NOT_OPERATIONAL;
35 else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
36 & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
37 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
39 *reg &= 0xffffffff00000000UL;
40 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
42 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
43 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
45 *reg |= SIGP_STATUS_STOPPED;
46 rc = SIGP_CC_STATUS_STORED;
48 spin_unlock(&fi->lock);
50 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
54 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
56 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
57 struct kvm_s390_local_interrupt *li;
58 struct kvm_s390_interrupt_info *inti;
61 if (cpu_addr >= KVM_MAX_VCPUS)
62 return SIGP_CC_NOT_OPERATIONAL;
64 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
68 inti->type = KVM_S390_INT_EMERGENCY;
69 inti->emerg.code = vcpu->vcpu_id;
72 li = fi->local_int[cpu_addr];
74 rc = SIGP_CC_NOT_OPERATIONAL;
78 spin_lock_bh(&li->lock);
79 list_add_tail(&inti->list, &li->list);
80 atomic_set(&li->active, 1);
81 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
82 if (waitqueue_active(li->wq))
83 wake_up_interruptible(li->wq);
84 spin_unlock_bh(&li->lock);
85 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
86 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
88 spin_unlock(&fi->lock);
92 static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
94 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
95 struct kvm_s390_local_interrupt *li;
96 struct kvm_s390_interrupt_info *inti;
99 if (cpu_addr >= KVM_MAX_VCPUS)
100 return SIGP_CC_NOT_OPERATIONAL;
102 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
106 inti->type = KVM_S390_INT_EXTERNAL_CALL;
107 inti->extcall.code = vcpu->vcpu_id;
109 spin_lock(&fi->lock);
110 li = fi->local_int[cpu_addr];
112 rc = SIGP_CC_NOT_OPERATIONAL;
116 spin_lock_bh(&li->lock);
117 list_add_tail(&inti->list, &li->list);
118 atomic_set(&li->active, 1);
119 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
120 if (waitqueue_active(li->wq))
121 wake_up_interruptible(li->wq);
122 spin_unlock_bh(&li->lock);
123 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
124 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
126 spin_unlock(&fi->lock);
130 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
132 struct kvm_s390_interrupt_info *inti;
134 inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
137 inti->type = KVM_S390_SIGP_STOP;
139 spin_lock_bh(&li->lock);
140 if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
144 list_add_tail(&inti->list, &li->list);
145 atomic_set(&li->active, 1);
146 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
147 li->action_bits |= action;
148 if (waitqueue_active(li->wq))
149 wake_up_interruptible(li->wq);
151 spin_unlock_bh(&li->lock);
153 return SIGP_CC_ORDER_CODE_ACCEPTED;
156 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
158 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
159 struct kvm_s390_local_interrupt *li;
162 if (cpu_addr >= KVM_MAX_VCPUS)
163 return SIGP_CC_NOT_OPERATIONAL;
165 spin_lock(&fi->lock);
166 li = fi->local_int[cpu_addr];
168 rc = SIGP_CC_NOT_OPERATIONAL;
172 rc = __inject_sigp_stop(li, action);
175 spin_unlock(&fi->lock);
176 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
180 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
182 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
183 return __inject_sigp_stop(li, action);
186 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
190 switch (parameter & 0xff) {
192 rc = SIGP_CC_NOT_OPERATIONAL;
196 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
204 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
207 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
208 struct kvm_s390_local_interrupt *li = NULL;
209 struct kvm_s390_interrupt_info *inti;
213 /* make sure that the new value is valid memory */
214 address = address & 0x7fffe000u;
215 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
216 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
217 *reg &= 0xffffffff00000000UL;
218 *reg |= SIGP_STATUS_INVALID_PARAMETER;
219 return SIGP_CC_STATUS_STORED;
222 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
226 spin_lock(&fi->lock);
227 if (cpu_addr < KVM_MAX_VCPUS)
228 li = fi->local_int[cpu_addr];
231 *reg &= 0xffffffff00000000UL;
232 *reg |= SIGP_STATUS_INCORRECT_STATE;
233 rc = SIGP_CC_STATUS_STORED;
238 spin_lock_bh(&li->lock);
239 /* cpu must be in stopped state */
240 if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
241 *reg &= 0xffffffff00000000UL;
242 *reg |= SIGP_STATUS_INCORRECT_STATE;
243 rc = SIGP_CC_STATUS_STORED;
248 inti->type = KVM_S390_SIGP_SET_PREFIX;
249 inti->prefix.address = address;
251 list_add_tail(&inti->list, &li->list);
252 atomic_set(&li->active, 1);
253 if (waitqueue_active(li->wq))
254 wake_up_interruptible(li->wq);
255 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
257 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
259 spin_unlock_bh(&li->lock);
261 spin_unlock(&fi->lock);
265 static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
269 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
271 if (cpu_addr >= KVM_MAX_VCPUS)
272 return SIGP_CC_NOT_OPERATIONAL;
274 spin_lock(&fi->lock);
275 if (fi->local_int[cpu_addr] == NULL)
276 rc = SIGP_CC_NOT_OPERATIONAL;
278 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
281 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
284 *reg &= 0xffffffff00000000UL;
285 *reg |= SIGP_STATUS_NOT_RUNNING;
286 rc = SIGP_CC_STATUS_STORED;
289 spin_unlock(&fi->lock);
291 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
297 static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
299 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
300 struct kvm_s390_local_interrupt *li;
301 int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
303 if (cpu_addr >= KVM_MAX_VCPUS)
304 return SIGP_CC_NOT_OPERATIONAL;
306 spin_lock(&fi->lock);
307 li = fi->local_int[cpu_addr];
309 rc = SIGP_CC_NOT_OPERATIONAL;
313 spin_lock_bh(&li->lock);
314 if (li->action_bits & ACTION_STOP_ON_STOP)
317 VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
319 spin_unlock_bh(&li->lock);
321 spin_unlock(&fi->lock);
325 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
327 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
328 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
330 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
334 /* sigp in userspace can exit */
335 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
336 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
338 order_code = kvm_s390_get_base_disp_rs(vcpu);
341 parameter = vcpu->run->s.regs.gprs[r1];
343 parameter = vcpu->run->s.regs.gprs[r1 + 1];
345 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
346 switch (order_code) {
348 vcpu->stat.instruction_sigp_sense++;
349 rc = __sigp_sense(vcpu, cpu_addr,
350 &vcpu->run->s.regs.gprs[r1]);
352 case SIGP_EXTERNAL_CALL:
353 vcpu->stat.instruction_sigp_external_call++;
354 rc = __sigp_external_call(vcpu, cpu_addr);
356 case SIGP_EMERGENCY_SIGNAL:
357 vcpu->stat.instruction_sigp_emergency++;
358 rc = __sigp_emergency(vcpu, cpu_addr);
361 vcpu->stat.instruction_sigp_stop++;
362 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
364 case SIGP_STOP_AND_STORE_STATUS:
365 vcpu->stat.instruction_sigp_stop++;
366 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
367 ACTION_STOP_ON_STOP);
369 case SIGP_SET_ARCHITECTURE:
370 vcpu->stat.instruction_sigp_arch++;
371 rc = __sigp_set_arch(vcpu, parameter);
373 case SIGP_SET_PREFIX:
374 vcpu->stat.instruction_sigp_prefix++;
375 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
376 &vcpu->run->s.regs.gprs[r1]);
378 case SIGP_SENSE_RUNNING:
379 vcpu->stat.instruction_sigp_sense_running++;
380 rc = __sigp_sense_running(vcpu, cpu_addr,
381 &vcpu->run->s.regs.gprs[r1]);
384 vcpu->stat.instruction_sigp_restart++;
385 rc = __sigp_restart(vcpu, cpu_addr);
386 if (rc == SIGP_CC_BUSY)
388 /* user space must know about restart */
396 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
397 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;