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5288fbf0 CB |
1 | /* |
2 | * sigp.c - handlinge interprocessor communication | |
3 | * | |
9ace903d | 4 | * Copyright IBM Corp. 2008,2009 |
5288fbf0 CB |
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> | |
9ace903d | 12 | * Christian Ehrhardt <ehrhardt@de.ibm.com> |
5288fbf0 CB |
13 | */ |
14 | ||
15 | #include <linux/kvm.h> | |
16 | #include <linux/kvm_host.h> | |
17 | #include "gaccess.h" | |
18 | #include "kvm-s390.h" | |
19 | ||
20 | /* sigp order codes */ | |
21 | #define SIGP_SENSE 0x01 | |
22 | #define SIGP_EXTERNAL_CALL 0x02 | |
23 | #define SIGP_EMERGENCY 0x03 | |
24 | #define SIGP_START 0x04 | |
25 | #define SIGP_STOP 0x05 | |
26 | #define SIGP_RESTART 0x06 | |
27 | #define SIGP_STOP_STORE_STATUS 0x09 | |
28 | #define SIGP_INITIAL_CPU_RESET 0x0b | |
29 | #define SIGP_CPU_RESET 0x0c | |
30 | #define SIGP_SET_PREFIX 0x0d | |
31 | #define SIGP_STORE_STATUS_ADDR 0x0e | |
32 | #define SIGP_SET_ARCH 0x12 | |
33 | ||
34 | /* cpu status bits */ | |
35 | #define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL | |
36 | #define SIGP_STAT_INCORRECT_STATE 0x00000200UL | |
37 | #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL | |
38 | #define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL | |
39 | #define SIGP_STAT_STOPPED 0x00000040UL | |
40 | #define SIGP_STAT_OPERATOR_INTERV 0x00000020UL | |
41 | #define SIGP_STAT_CHECK_STOP 0x00000010UL | |
42 | #define SIGP_STAT_INOPERATIVE 0x00000004UL | |
43 | #define SIGP_STAT_INVALID_ORDER 0x00000002UL | |
44 | #define SIGP_STAT_RECEIVER_CHECK 0x00000001UL | |
45 | ||
46 | ||
0096369d MS |
47 | static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, |
48 | unsigned long *reg) | |
5288fbf0 | 49 | { |
180c12fb | 50 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
5288fbf0 CB |
51 | int rc; |
52 | ||
53 | if (cpu_addr >= KVM_MAX_VCPUS) | |
54 | return 3; /* not operational */ | |
55 | ||
b037a4f3 | 56 | spin_lock(&fi->lock); |
5288fbf0 CB |
57 | if (fi->local_int[cpu_addr] == NULL) |
58 | rc = 3; /* not operational */ | |
59 | else if (atomic_read(fi->local_int[cpu_addr]->cpuflags) | |
60 | & CPUSTAT_RUNNING) { | |
61 | *reg &= 0xffffffff00000000UL; | |
62 | rc = 1; /* status stored */ | |
63 | } else { | |
64 | *reg &= 0xffffffff00000000UL; | |
65 | *reg |= SIGP_STAT_STOPPED; | |
66 | rc = 1; /* status stored */ | |
67 | } | |
b037a4f3 | 68 | spin_unlock(&fi->lock); |
5288fbf0 CB |
69 | |
70 | VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc); | |
71 | return rc; | |
72 | } | |
73 | ||
74 | static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) | |
75 | { | |
180c12fb CB |
76 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
77 | struct kvm_s390_local_interrupt *li; | |
78 | struct kvm_s390_interrupt_info *inti; | |
5288fbf0 CB |
79 | int rc; |
80 | ||
81 | if (cpu_addr >= KVM_MAX_VCPUS) | |
82 | return 3; /* not operational */ | |
83 | ||
84 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
85 | if (!inti) | |
86 | return -ENOMEM; | |
87 | ||
88 | inti->type = KVM_S390_INT_EMERGENCY; | |
89 | ||
b037a4f3 | 90 | spin_lock(&fi->lock); |
5288fbf0 CB |
91 | li = fi->local_int[cpu_addr]; |
92 | if (li == NULL) { | |
93 | rc = 3; /* not operational */ | |
94 | kfree(inti); | |
95 | goto unlock; | |
96 | } | |
97 | spin_lock_bh(&li->lock); | |
98 | list_add_tail(&inti->list, &li->list); | |
99 | atomic_set(&li->active, 1); | |
100 | atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); | |
101 | if (waitqueue_active(&li->wq)) | |
102 | wake_up_interruptible(&li->wq); | |
103 | spin_unlock_bh(&li->lock); | |
104 | rc = 0; /* order accepted */ | |
105 | unlock: | |
b037a4f3 | 106 | spin_unlock(&fi->lock); |
5288fbf0 CB |
107 | VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); |
108 | return rc; | |
109 | } | |
110 | ||
9ace903d | 111 | static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) |
5288fbf0 | 112 | { |
180c12fb | 113 | struct kvm_s390_interrupt_info *inti; |
5288fbf0 CB |
114 | |
115 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
116 | if (!inti) | |
117 | return -ENOMEM; | |
5288fbf0 CB |
118 | inti->type = KVM_S390_SIGP_STOP; |
119 | ||
5288fbf0 CB |
120 | spin_lock_bh(&li->lock); |
121 | list_add_tail(&inti->list, &li->list); | |
122 | atomic_set(&li->active, 1); | |
123 | atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); | |
9ace903d | 124 | li->action_bits |= action; |
5288fbf0 CB |
125 | if (waitqueue_active(&li->wq)) |
126 | wake_up_interruptible(&li->wq); | |
127 | spin_unlock_bh(&li->lock); | |
9ace903d CE |
128 | |
129 | return 0; /* order accepted */ | |
130 | } | |
131 | ||
132 | static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) | |
133 | { | |
134 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; | |
135 | struct kvm_s390_local_interrupt *li; | |
136 | int rc; | |
137 | ||
138 | if (cpu_addr >= KVM_MAX_VCPUS) | |
139 | return 3; /* not operational */ | |
140 | ||
141 | spin_lock(&fi->lock); | |
142 | li = fi->local_int[cpu_addr]; | |
143 | if (li == NULL) { | |
144 | rc = 3; /* not operational */ | |
145 | goto unlock; | |
146 | } | |
147 | ||
148 | rc = __inject_sigp_stop(li, action); | |
149 | ||
5288fbf0 | 150 | unlock: |
b037a4f3 | 151 | spin_unlock(&fi->lock); |
5288fbf0 CB |
152 | VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); |
153 | return rc; | |
154 | } | |
155 | ||
9ace903d CE |
156 | int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action) |
157 | { | |
158 | struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; | |
159 | return __inject_sigp_stop(li, action); | |
160 | } | |
161 | ||
5288fbf0 CB |
162 | static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) |
163 | { | |
164 | int rc; | |
165 | ||
166 | switch (parameter & 0xff) { | |
167 | case 0: | |
5288fbf0 CB |
168 | rc = 3; /* not operational */ |
169 | break; | |
170 | case 1: | |
171 | case 2: | |
172 | rc = 0; /* order accepted */ | |
173 | break; | |
174 | default: | |
175 | rc = -ENOTSUPP; | |
176 | } | |
177 | return rc; | |
178 | } | |
179 | ||
180 | static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, | |
0096369d | 181 | unsigned long *reg) |
5288fbf0 | 182 | { |
180c12fb | 183 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
53cb780a | 184 | struct kvm_s390_local_interrupt *li = NULL; |
180c12fb | 185 | struct kvm_s390_interrupt_info *inti; |
5288fbf0 CB |
186 | int rc; |
187 | u8 tmp; | |
188 | ||
189 | /* make sure that the new value is valid memory */ | |
190 | address = address & 0x7fffe000u; | |
f50146bd CO |
191 | if ((copy_from_user(&tmp, (void __user *) |
192 | (address + vcpu->arch.sie_block->gmsor) , 1)) || | |
193 | (copy_from_user(&tmp, (void __user *)(address + | |
628eb9b8 | 194 | vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) { |
5288fbf0 CB |
195 | *reg |= SIGP_STAT_INVALID_PARAMETER; |
196 | return 1; /* invalid parameter */ | |
197 | } | |
198 | ||
199 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
200 | if (!inti) | |
201 | return 2; /* busy */ | |
202 | ||
b037a4f3 | 203 | spin_lock(&fi->lock); |
53cb780a RK |
204 | if (cpu_addr < KVM_MAX_VCPUS) |
205 | li = fi->local_int[cpu_addr]; | |
5288fbf0 | 206 | |
53cb780a | 207 | if (li == NULL) { |
5288fbf0 CB |
208 | rc = 1; /* incorrect state */ |
209 | *reg &= SIGP_STAT_INCORRECT_STATE; | |
210 | kfree(inti); | |
211 | goto out_fi; | |
212 | } | |
213 | ||
214 | spin_lock_bh(&li->lock); | |
215 | /* cpu must be in stopped state */ | |
216 | if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) { | |
217 | rc = 1; /* incorrect state */ | |
218 | *reg &= SIGP_STAT_INCORRECT_STATE; | |
219 | kfree(inti); | |
220 | goto out_li; | |
221 | } | |
222 | ||
223 | inti->type = KVM_S390_SIGP_SET_PREFIX; | |
224 | inti->prefix.address = address; | |
225 | ||
226 | list_add_tail(&inti->list, &li->list); | |
227 | atomic_set(&li->active, 1); | |
228 | if (waitqueue_active(&li->wq)) | |
229 | wake_up_interruptible(&li->wq); | |
230 | rc = 0; /* order accepted */ | |
231 | ||
232 | VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address); | |
233 | out_li: | |
234 | spin_unlock_bh(&li->lock); | |
235 | out_fi: | |
b037a4f3 | 236 | spin_unlock(&fi->lock); |
5288fbf0 CB |
237 | return rc; |
238 | } | |
239 | ||
240 | int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) | |
241 | { | |
242 | int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; | |
243 | int r3 = vcpu->arch.sie_block->ipa & 0x000f; | |
244 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
245 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
246 | u32 parameter; | |
247 | u16 cpu_addr = vcpu->arch.guest_gprs[r3]; | |
248 | u8 order_code; | |
249 | int rc; | |
250 | ||
3eb77d51 CB |
251 | /* sigp in userspace can exit */ |
252 | if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) | |
253 | return kvm_s390_inject_program_int(vcpu, | |
254 | PGM_PRIVILEGED_OPERATION); | |
255 | ||
5288fbf0 CB |
256 | order_code = disp2; |
257 | if (base2) | |
258 | order_code += vcpu->arch.guest_gprs[base2]; | |
259 | ||
260 | if (r1 % 2) | |
261 | parameter = vcpu->arch.guest_gprs[r1]; | |
262 | else | |
263 | parameter = vcpu->arch.guest_gprs[r1 + 1]; | |
264 | ||
265 | switch (order_code) { | |
266 | case SIGP_SENSE: | |
267 | vcpu->stat.instruction_sigp_sense++; | |
268 | rc = __sigp_sense(vcpu, cpu_addr, | |
269 | &vcpu->arch.guest_gprs[r1]); | |
270 | break; | |
271 | case SIGP_EMERGENCY: | |
272 | vcpu->stat.instruction_sigp_emergency++; | |
273 | rc = __sigp_emergency(vcpu, cpu_addr); | |
274 | break; | |
275 | case SIGP_STOP: | |
276 | vcpu->stat.instruction_sigp_stop++; | |
9ace903d | 277 | rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); |
5288fbf0 CB |
278 | break; |
279 | case SIGP_STOP_STORE_STATUS: | |
280 | vcpu->stat.instruction_sigp_stop++; | |
9ace903d | 281 | rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP); |
5288fbf0 CB |
282 | break; |
283 | case SIGP_SET_ARCH: | |
284 | vcpu->stat.instruction_sigp_arch++; | |
285 | rc = __sigp_set_arch(vcpu, parameter); | |
286 | break; | |
287 | case SIGP_SET_PREFIX: | |
288 | vcpu->stat.instruction_sigp_prefix++; | |
289 | rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, | |
290 | &vcpu->arch.guest_gprs[r1]); | |
291 | break; | |
292 | case SIGP_RESTART: | |
293 | vcpu->stat.instruction_sigp_restart++; | |
294 | /* user space must know about restart */ | |
295 | default: | |
296 | return -ENOTSUPP; | |
297 | } | |
298 | ||
299 | if (rc < 0) | |
300 | return rc; | |
301 | ||
302 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
303 | vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44; | |
304 | return 0; | |
305 | } |