include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / arch / s390 / kvm / sigp.c
1 /*
2  * sigp.c - handlinge interprocessor communication
3  *
4  * Copyright IBM Corp. 2008,2009
5  *
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.
9  *
10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
11  *               Christian Borntraeger <borntraeger@de.ibm.com>
12  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
13  */
14
15 #include <linux/kvm.h>
16 #include <linux/kvm_host.h>
17 #include <linux/slab.h>
18 #include "gaccess.h"
19 #include "kvm-s390.h"
20
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
35 /* cpu status bits */
36 #define SIGP_STAT_EQUIPMENT_CHECK   0x80000000UL
37 #define SIGP_STAT_INCORRECT_STATE   0x00000200UL
38 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
39 #define SIGP_STAT_EXT_CALL_PENDING  0x00000080UL
40 #define SIGP_STAT_STOPPED           0x00000040UL
41 #define SIGP_STAT_OPERATOR_INTERV   0x00000020UL
42 #define SIGP_STAT_CHECK_STOP        0x00000010UL
43 #define SIGP_STAT_INOPERATIVE       0x00000004UL
44 #define SIGP_STAT_INVALID_ORDER     0x00000002UL
45 #define SIGP_STAT_RECEIVER_CHECK    0x00000001UL
46
47
48 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
49                         unsigned long *reg)
50 {
51         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
52         int rc;
53
54         if (cpu_addr >= KVM_MAX_VCPUS)
55                 return 3; /* not operational */
56
57         spin_lock(&fi->lock);
58         if (fi->local_int[cpu_addr] == NULL)
59                 rc = 3; /* not operational */
60         else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
61                  & CPUSTAT_RUNNING) {
62                 *reg &= 0xffffffff00000000UL;
63                 rc = 1; /* status stored */
64         } else {
65                 *reg &= 0xffffffff00000000UL;
66                 *reg |= SIGP_STAT_STOPPED;
67                 rc = 1; /* status stored */
68         }
69         spin_unlock(&fi->lock);
70
71         VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
72         return rc;
73 }
74
75 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
76 {
77         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
78         struct kvm_s390_local_interrupt *li;
79         struct kvm_s390_interrupt_info *inti;
80         int rc;
81
82         if (cpu_addr >= KVM_MAX_VCPUS)
83                 return 3; /* not operational */
84
85         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
86         if (!inti)
87                 return -ENOMEM;
88
89         inti->type = KVM_S390_INT_EMERGENCY;
90
91         spin_lock(&fi->lock);
92         li = fi->local_int[cpu_addr];
93         if (li == NULL) {
94                 rc = 3; /* not operational */
95                 kfree(inti);
96                 goto unlock;
97         }
98         spin_lock_bh(&li->lock);
99         list_add_tail(&inti->list, &li->list);
100         atomic_set(&li->active, 1);
101         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
102         if (waitqueue_active(&li->wq))
103                 wake_up_interruptible(&li->wq);
104         spin_unlock_bh(&li->lock);
105         rc = 0; /* order accepted */
106 unlock:
107         spin_unlock(&fi->lock);
108         VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
109         return rc;
110 }
111
112 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
113 {
114         struct kvm_s390_interrupt_info *inti;
115
116         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
117         if (!inti)
118                 return -ENOMEM;
119         inti->type = KVM_S390_SIGP_STOP;
120
121         spin_lock_bh(&li->lock);
122         list_add_tail(&inti->list, &li->list);
123         atomic_set(&li->active, 1);
124         atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
125         li->action_bits |= action;
126         if (waitqueue_active(&li->wq))
127                 wake_up_interruptible(&li->wq);
128         spin_unlock_bh(&li->lock);
129
130         return 0; /* order accepted */
131 }
132
133 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
134 {
135         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
136         struct kvm_s390_local_interrupt *li;
137         int rc;
138
139         if (cpu_addr >= KVM_MAX_VCPUS)
140                 return 3; /* not operational */
141
142         spin_lock(&fi->lock);
143         li = fi->local_int[cpu_addr];
144         if (li == NULL) {
145                 rc = 3; /* not operational */
146                 goto unlock;
147         }
148
149         rc = __inject_sigp_stop(li, action);
150
151 unlock:
152         spin_unlock(&fi->lock);
153         VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
154         return rc;
155 }
156
157 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
158 {
159         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
160         return __inject_sigp_stop(li, action);
161 }
162
163 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
164 {
165         int rc;
166
167         switch (parameter & 0xff) {
168         case 0:
169                 rc = 3; /* not operational */
170                 break;
171         case 1:
172         case 2:
173                 rc = 0; /* order accepted */
174                 break;
175         default:
176                 rc = -EOPNOTSUPP;
177         }
178         return rc;
179 }
180
181 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
182                              unsigned long *reg)
183 {
184         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
185         struct kvm_s390_local_interrupt *li = NULL;
186         struct kvm_s390_interrupt_info *inti;
187         int rc;
188         u8 tmp;
189
190         /* make sure that the new value is valid memory */
191         address = address & 0x7fffe000u;
192         if ((copy_from_user(&tmp, (void __user *)
193                 (address + vcpu->arch.sie_block->gmsor) , 1)) ||
194            (copy_from_user(&tmp, (void __user *)(address +
195                         vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) {
196                 *reg |= SIGP_STAT_INVALID_PARAMETER;
197                 return 1; /* invalid parameter */
198         }
199
200         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
201         if (!inti)
202                 return 2; /* busy */
203
204         spin_lock(&fi->lock);
205         if (cpu_addr < KVM_MAX_VCPUS)
206                 li = fi->local_int[cpu_addr];
207
208         if (li == NULL) {
209                 rc = 1; /* incorrect state */
210                 *reg &= SIGP_STAT_INCORRECT_STATE;
211                 kfree(inti);
212                 goto out_fi;
213         }
214
215         spin_lock_bh(&li->lock);
216         /* cpu must be in stopped state */
217         if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
218                 rc = 1; /* incorrect state */
219                 *reg &= SIGP_STAT_INCORRECT_STATE;
220                 kfree(inti);
221                 goto out_li;
222         }
223
224         inti->type = KVM_S390_SIGP_SET_PREFIX;
225         inti->prefix.address = address;
226
227         list_add_tail(&inti->list, &li->list);
228         atomic_set(&li->active, 1);
229         if (waitqueue_active(&li->wq))
230                 wake_up_interruptible(&li->wq);
231         rc = 0; /* order accepted */
232
233         VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
234 out_li:
235         spin_unlock_bh(&li->lock);
236 out_fi:
237         spin_unlock(&fi->lock);
238         return rc;
239 }
240
241 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
242 {
243         int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
244         int r3 = vcpu->arch.sie_block->ipa & 0x000f;
245         int base2 = vcpu->arch.sie_block->ipb >> 28;
246         int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
247         u32 parameter;
248         u16 cpu_addr = vcpu->arch.guest_gprs[r3];
249         u8 order_code;
250         int rc;
251
252         /* sigp in userspace can exit */
253         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
254                 return kvm_s390_inject_program_int(vcpu,
255                                                    PGM_PRIVILEGED_OPERATION);
256
257         order_code = disp2;
258         if (base2)
259                 order_code += vcpu->arch.guest_gprs[base2];
260
261         if (r1 % 2)
262                 parameter = vcpu->arch.guest_gprs[r1];
263         else
264                 parameter = vcpu->arch.guest_gprs[r1 + 1];
265
266         switch (order_code) {
267         case SIGP_SENSE:
268                 vcpu->stat.instruction_sigp_sense++;
269                 rc = __sigp_sense(vcpu, cpu_addr,
270                                   &vcpu->arch.guest_gprs[r1]);
271                 break;
272         case SIGP_EMERGENCY:
273                 vcpu->stat.instruction_sigp_emergency++;
274                 rc = __sigp_emergency(vcpu, cpu_addr);
275                 break;
276         case SIGP_STOP:
277                 vcpu->stat.instruction_sigp_stop++;
278                 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
279                 break;
280         case SIGP_STOP_STORE_STATUS:
281                 vcpu->stat.instruction_sigp_stop++;
282                 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP);
283                 break;
284         case SIGP_SET_ARCH:
285                 vcpu->stat.instruction_sigp_arch++;
286                 rc = __sigp_set_arch(vcpu, parameter);
287                 break;
288         case SIGP_SET_PREFIX:
289                 vcpu->stat.instruction_sigp_prefix++;
290                 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
291                                        &vcpu->arch.guest_gprs[r1]);
292                 break;
293         case SIGP_RESTART:
294                 vcpu->stat.instruction_sigp_restart++;
295                 /* user space must know about restart */
296         default:
297                 return -EOPNOTSUPP;
298         }
299
300         if (rc < 0)
301                 return rc;
302
303         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
304         vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
305         return 0;
306 }