2 * sigp.c - handlinge 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>
21 /* sigp order codes */
22 #define SIGP_SENSE 0x01
23 #define SIGP_EXTERNAL_CALL 0x02
24 #define SIGP_EMERGENCY 0x03
25 #define SIGP_START 0x04
26 #define SIGP_STOP 0x05
27 #define SIGP_RESTART 0x06
28 #define SIGP_STOP_STORE_STATUS 0x09
29 #define SIGP_INITIAL_CPU_RESET 0x0b
30 #define SIGP_CPU_RESET 0x0c
31 #define SIGP_SET_PREFIX 0x0d
32 #define SIGP_STORE_STATUS_ADDR 0x0e
33 #define SIGP_SET_ARCH 0x12
34 #define SIGP_SENSE_RUNNING 0x15
37 #define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
38 #define SIGP_STAT_NOT_RUNNING 0x00000400UL
39 #define SIGP_STAT_INCORRECT_STATE 0x00000200UL
40 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
41 #define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
42 #define SIGP_STAT_STOPPED 0x00000040UL
43 #define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
44 #define SIGP_STAT_CHECK_STOP 0x00000010UL
45 #define SIGP_STAT_INOPERATIVE 0x00000004UL
46 #define SIGP_STAT_INVALID_ORDER 0x00000002UL
47 #define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
50 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
53 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
56 if (cpu_addr >= KVM_MAX_VCPUS)
57 return 3; /* not operational */
60 if (fi->local_int[cpu_addr] == NULL)
61 rc = 3; /* not operational */
62 else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
64 *reg &= 0xffffffff00000000UL;
65 rc = 1; /* status stored */
67 *reg &= 0xffffffff00000000UL;
68 *reg |= SIGP_STAT_STOPPED;
69 rc = 1; /* status stored */
71 spin_unlock(&fi->lock);
73 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
77 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
79 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
80 struct kvm_s390_local_interrupt *li;
81 struct kvm_s390_interrupt_info *inti;
84 if (cpu_addr >= KVM_MAX_VCPUS)
85 return 3; /* not operational */
87 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
91 inti->type = KVM_S390_INT_EMERGENCY;
92 inti->emerg.code = vcpu->vcpu_id;
95 li = fi->local_int[cpu_addr];
97 rc = 3; /* not operational */
101 spin_lock_bh(&li->lock);
102 list_add_tail(&inti->list, &li->list);
103 atomic_set(&li->active, 1);
104 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
105 if (waitqueue_active(&li->wq))
106 wake_up_interruptible(&li->wq);
107 spin_unlock_bh(&li->lock);
108 rc = 0; /* order accepted */
109 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
111 spin_unlock(&fi->lock);
115 static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
117 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
118 struct kvm_s390_local_interrupt *li;
119 struct kvm_s390_interrupt_info *inti;
122 if (cpu_addr >= KVM_MAX_VCPUS)
123 return 3; /* not operational */
125 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
129 inti->type = KVM_S390_INT_EXTERNAL_CALL;
130 inti->extcall.code = vcpu->vcpu_id;
132 spin_lock(&fi->lock);
133 li = fi->local_int[cpu_addr];
135 rc = 3; /* not operational */
139 spin_lock_bh(&li->lock);
140 list_add_tail(&inti->list, &li->list);
141 atomic_set(&li->active, 1);
142 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
143 if (waitqueue_active(&li->wq))
144 wake_up_interruptible(&li->wq);
145 spin_unlock_bh(&li->lock);
146 rc = 0; /* order accepted */
147 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
149 spin_unlock(&fi->lock);
153 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
155 struct kvm_s390_interrupt_info *inti;
157 inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
160 inti->type = KVM_S390_SIGP_STOP;
162 spin_lock_bh(&li->lock);
163 if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED))
165 list_add_tail(&inti->list, &li->list);
166 atomic_set(&li->active, 1);
167 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
168 li->action_bits |= action;
169 if (waitqueue_active(&li->wq))
170 wake_up_interruptible(&li->wq);
172 spin_unlock_bh(&li->lock);
174 return 0; /* order accepted */
177 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
179 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
180 struct kvm_s390_local_interrupt *li;
183 if (cpu_addr >= KVM_MAX_VCPUS)
184 return 3; /* not operational */
186 spin_lock(&fi->lock);
187 li = fi->local_int[cpu_addr];
189 rc = 3; /* not operational */
193 rc = __inject_sigp_stop(li, action);
196 spin_unlock(&fi->lock);
197 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
201 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
203 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
204 return __inject_sigp_stop(li, action);
207 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
211 switch (parameter & 0xff) {
213 rc = 3; /* not operational */
217 rc = 0; /* order accepted */
225 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
228 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
229 struct kvm_s390_local_interrupt *li = NULL;
230 struct kvm_s390_interrupt_info *inti;
234 /* make sure that the new value is valid memory */
235 address = address & 0x7fffe000u;
236 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
237 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
238 *reg |= SIGP_STAT_INVALID_PARAMETER;
239 return 1; /* invalid parameter */
242 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
246 spin_lock(&fi->lock);
247 if (cpu_addr < KVM_MAX_VCPUS)
248 li = fi->local_int[cpu_addr];
251 rc = 1; /* incorrect state */
252 *reg &= SIGP_STAT_INCORRECT_STATE;
257 spin_lock_bh(&li->lock);
258 /* cpu must be in stopped state */
259 if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
260 rc = 1; /* incorrect state */
261 *reg &= SIGP_STAT_INCORRECT_STATE;
266 inti->type = KVM_S390_SIGP_SET_PREFIX;
267 inti->prefix.address = address;
269 list_add_tail(&inti->list, &li->list);
270 atomic_set(&li->active, 1);
271 if (waitqueue_active(&li->wq))
272 wake_up_interruptible(&li->wq);
273 rc = 0; /* order accepted */
275 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
277 spin_unlock_bh(&li->lock);
279 spin_unlock(&fi->lock);
283 static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
287 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
289 if (cpu_addr >= KVM_MAX_VCPUS)
290 return 3; /* not operational */
292 spin_lock(&fi->lock);
293 if (fi->local_int[cpu_addr] == NULL)
294 rc = 3; /* not operational */
296 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
302 *reg &= 0xffffffff00000000UL;
303 *reg |= SIGP_STAT_NOT_RUNNING;
307 spin_unlock(&fi->lock);
309 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
315 static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
318 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
319 struct kvm_s390_local_interrupt *li;
321 if (cpu_addr >= KVM_MAX_VCPUS)
322 return 3; /* not operational */
324 spin_lock(&fi->lock);
325 li = fi->local_int[cpu_addr];
327 rc = 3; /* not operational */
331 spin_lock_bh(&li->lock);
332 if (li->action_bits & ACTION_STOP_ON_STOP)
335 VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
337 spin_unlock_bh(&li->lock);
339 spin_unlock(&fi->lock);
343 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
345 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
346 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
347 int base2 = vcpu->arch.sie_block->ipb >> 28;
348 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
350 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
354 /* sigp in userspace can exit */
355 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
356 return kvm_s390_inject_program_int(vcpu,
357 PGM_PRIVILEGED_OPERATION);
361 order_code += vcpu->run->s.regs.gprs[base2];
364 parameter = vcpu->run->s.regs.gprs[r1];
366 parameter = vcpu->run->s.regs.gprs[r1 + 1];
368 switch (order_code) {
370 vcpu->stat.instruction_sigp_sense++;
371 rc = __sigp_sense(vcpu, cpu_addr,
372 &vcpu->run->s.regs.gprs[r1]);
374 case SIGP_EXTERNAL_CALL:
375 vcpu->stat.instruction_sigp_external_call++;
376 rc = __sigp_external_call(vcpu, cpu_addr);
379 vcpu->stat.instruction_sigp_emergency++;
380 rc = __sigp_emergency(vcpu, cpu_addr);
383 vcpu->stat.instruction_sigp_stop++;
384 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
386 case SIGP_STOP_STORE_STATUS:
387 vcpu->stat.instruction_sigp_stop++;
388 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
389 ACTION_STOP_ON_STOP);
392 vcpu->stat.instruction_sigp_arch++;
393 rc = __sigp_set_arch(vcpu, parameter);
395 case SIGP_SET_PREFIX:
396 vcpu->stat.instruction_sigp_prefix++;
397 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
398 &vcpu->run->s.regs.gprs[r1]);
400 case SIGP_SENSE_RUNNING:
401 vcpu->stat.instruction_sigp_sense_running++;
402 rc = __sigp_sense_running(vcpu, cpu_addr,
403 &vcpu->run->s.regs.gprs[r1]);
406 vcpu->stat.instruction_sigp_restart++;
407 rc = __sigp_restart(vcpu, cpu_addr);
408 if (rc == 2) /* busy */
410 /* user space must know about restart */
418 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
419 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;