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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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
5288fbf0 CB |
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 | ||
0096369d MS |
48 | static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, |
49 | unsigned long *reg) | |
5288fbf0 | 50 | { |
180c12fb | 51 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
5288fbf0 CB |
52 | int rc; |
53 | ||
54 | if (cpu_addr >= KVM_MAX_VCPUS) | |
55 | return 3; /* not operational */ | |
56 | ||
b037a4f3 | 57 | spin_lock(&fi->lock); |
5288fbf0 CB |
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 | } | |
b037a4f3 | 69 | spin_unlock(&fi->lock); |
5288fbf0 CB |
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 | { | |
180c12fb CB |
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; | |
5288fbf0 CB |
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 | ||
b037a4f3 | 91 | spin_lock(&fi->lock); |
5288fbf0 CB |
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: | |
b037a4f3 | 107 | spin_unlock(&fi->lock); |
5288fbf0 CB |
108 | VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); |
109 | return rc; | |
110 | } | |
111 | ||
9ace903d | 112 | static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) |
5288fbf0 | 113 | { |
180c12fb | 114 | struct kvm_s390_interrupt_info *inti; |
5288fbf0 CB |
115 | |
116 | inti = kzalloc(sizeof(*inti), GFP_KERNEL); | |
117 | if (!inti) | |
118 | return -ENOMEM; | |
5288fbf0 CB |
119 | inti->type = KVM_S390_SIGP_STOP; |
120 | ||
5288fbf0 CB |
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); | |
9ace903d | 125 | li->action_bits |= action; |
5288fbf0 CB |
126 | if (waitqueue_active(&li->wq)) |
127 | wake_up_interruptible(&li->wq); | |
128 | spin_unlock_bh(&li->lock); | |
9ace903d CE |
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 | ||
5288fbf0 | 151 | unlock: |
b037a4f3 | 152 | spin_unlock(&fi->lock); |
5288fbf0 CB |
153 | VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); |
154 | return rc; | |
155 | } | |
156 | ||
9ace903d CE |
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 | ||
5288fbf0 CB |
163 | static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) |
164 | { | |
165 | int rc; | |
166 | ||
167 | switch (parameter & 0xff) { | |
168 | case 0: | |
5288fbf0 CB |
169 | rc = 3; /* not operational */ |
170 | break; | |
171 | case 1: | |
172 | case 2: | |
173 | rc = 0; /* order accepted */ | |
174 | break; | |
175 | default: | |
b8e660b8 | 176 | rc = -EOPNOTSUPP; |
5288fbf0 CB |
177 | } |
178 | return rc; | |
179 | } | |
180 | ||
181 | static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, | |
0096369d | 182 | unsigned long *reg) |
5288fbf0 | 183 | { |
180c12fb | 184 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
53cb780a | 185 | struct kvm_s390_local_interrupt *li = NULL; |
180c12fb | 186 | struct kvm_s390_interrupt_info *inti; |
5288fbf0 CB |
187 | int rc; |
188 | u8 tmp; | |
189 | ||
190 | /* make sure that the new value is valid memory */ | |
191 | address = address & 0x7fffe000u; | |
f50146bd CO |
192 | if ((copy_from_user(&tmp, (void __user *) |
193 | (address + vcpu->arch.sie_block->gmsor) , 1)) || | |
194 | (copy_from_user(&tmp, (void __user *)(address + | |
628eb9b8 | 195 | vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) { |
5288fbf0 CB |
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 | ||
b037a4f3 | 204 | spin_lock(&fi->lock); |
53cb780a RK |
205 | if (cpu_addr < KVM_MAX_VCPUS) |
206 | li = fi->local_int[cpu_addr]; | |
5288fbf0 | 207 | |
53cb780a | 208 | if (li == NULL) { |
5288fbf0 CB |
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: | |
b037a4f3 | 237 | spin_unlock(&fi->lock); |
5288fbf0 CB |
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 | ||
3eb77d51 CB |
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 | ||
5288fbf0 CB |
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++; | |
9ace903d | 278 | rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); |
5288fbf0 CB |
279 | break; |
280 | case SIGP_STOP_STORE_STATUS: | |
281 | vcpu->stat.instruction_sigp_stop++; | |
9ace903d | 282 | rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP); |
5288fbf0 CB |
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: | |
b8e660b8 | 297 | return -EOPNOTSUPP; |
5288fbf0 CB |
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 | } |