1 /*
2 * sigp.c - handlinge interprocessor communication
3 *
4 * Copyright IBM Corp. 2008
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 */
13
14 #include <linux/kvm.h>
15 #include <linux/kvm_host.h>
16 #include "gaccess.h"
17 #include "kvm-s390.h"
18
19 /* sigp order codes */
20 #define SIGP_SENSE 0x01
21 #define SIGP_EXTERNAL_CALL 0x02
22 #define SIGP_EMERGENCY 0x03
23 #define SIGP_START 0x04
24 #define SIGP_STOP 0x05
25 #define SIGP_RESTART 0x06
26 #define SIGP_STOP_STORE_STATUS 0x09
27 #define SIGP_INITIAL_CPU_RESET 0x0b
28 #define SIGP_CPU_RESET 0x0c
29 #define SIGP_SET_PREFIX 0x0d
30 #define SIGP_STORE_STATUS_ADDR 0x0e
31 #define SIGP_SET_ARCH 0x12
32
33 /* cpu status bits */
34 #define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
35 #define SIGP_STAT_INCORRECT_STATE 0x00000200UL
36 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
37 #define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
38 #define SIGP_STAT_STOPPED 0x00000040UL
39 #define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
40 #define SIGP_STAT_CHECK_STOP 0x00000010UL
41 #define SIGP_STAT_INOPERATIVE 0x00000004UL
42 #define SIGP_STAT_INVALID_ORDER 0x00000002UL
43 #define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
44
45
__sigp_sense(struct kvm_vcpu * vcpu,u16 cpu_addr,unsigned long * reg)46 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
47 unsigned long *reg)
48 {
49 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
50 int rc;
51
52 if (cpu_addr >= KVM_MAX_VCPUS)
53 return 3; /* not operational */
54
55 spin_lock_bh(&fi->lock);
56 if (fi->local_int[cpu_addr] == NULL)
57 rc = 3; /* not operational */
58 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
59 & CPUSTAT_RUNNING) {
60 *reg &= 0xffffffff00000000UL;
61 rc = 1; /* status stored */
62 } else {
63 *reg &= 0xffffffff00000000UL;
64 *reg |= SIGP_STAT_STOPPED;
65 rc = 1; /* status stored */
66 }
67 spin_unlock_bh(&fi->lock);
68
69 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
70 return rc;
71 }
72
__sigp_emergency(struct kvm_vcpu * vcpu,u16 cpu_addr)73 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
74 {
75 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
76 struct kvm_s390_local_interrupt *li;
77 struct kvm_s390_interrupt_info *inti;
78 int rc;
79
80 if (cpu_addr >= KVM_MAX_VCPUS)
81 return 3; /* not operational */
82
83 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
84 if (!inti)
85 return -ENOMEM;
86
87 inti->type = KVM_S390_INT_EMERGENCY;
88
89 spin_lock_bh(&fi->lock);
90 li = fi->local_int[cpu_addr];
91 if (li == NULL) {
92 rc = 3; /* not operational */
93 kfree(inti);
94 goto unlock;
95 }
96 spin_lock_bh(&li->lock);
97 list_add_tail(&inti->list, &li->list);
98 atomic_set(&li->active, 1);
99 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
100 if (waitqueue_active(&li->wq))
101 wake_up_interruptible(&li->wq);
102 spin_unlock_bh(&li->lock);
103 rc = 0; /* order accepted */
104 unlock:
105 spin_unlock_bh(&fi->lock);
106 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
107 return rc;
108 }
109
__sigp_stop(struct kvm_vcpu * vcpu,u16 cpu_addr,int store)110 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
111 {
112 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
113 struct kvm_s390_local_interrupt *li;
114 struct kvm_s390_interrupt_info *inti;
115 int rc;
116
117 if (cpu_addr >= KVM_MAX_VCPUS)
118 return 3; /* not operational */
119
120 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
121 if (!inti)
122 return -ENOMEM;
123
124 inti->type = KVM_S390_SIGP_STOP;
125
126 spin_lock_bh(&fi->lock);
127 li = fi->local_int[cpu_addr];
128 if (li == NULL) {
129 rc = 3; /* not operational */
130 kfree(inti);
131 goto unlock;
132 }
133 spin_lock_bh(&li->lock);
134 list_add_tail(&inti->list, &li->list);
135 atomic_set(&li->active, 1);
136 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
137 if (store)
138 li->action_bits |= ACTION_STORE_ON_STOP;
139 li->action_bits |= ACTION_STOP_ON_STOP;
140 if (waitqueue_active(&li->wq))
141 wake_up_interruptible(&li->wq);
142 spin_unlock_bh(&li->lock);
143 rc = 0; /* order accepted */
144 unlock:
145 spin_unlock_bh(&fi->lock);
146 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
147 return rc;
148 }
149
__sigp_set_arch(struct kvm_vcpu * vcpu,u32 parameter)150 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
151 {
152 int rc;
153
154 switch (parameter & 0xff) {
155 case 0:
156 printk(KERN_WARNING "kvm: request to switch to ESA/390 mode"
157 " not supported");
158 rc = 3; /* not operational */
159 break;
160 case 1:
161 case 2:
162 rc = 0; /* order accepted */
163 break;
164 default:
165 rc = -ENOTSUPP;
166 }
167 return rc;
168 }
169
__sigp_set_prefix(struct kvm_vcpu * vcpu,u16 cpu_addr,u32 address,unsigned long * reg)170 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
171 unsigned long *reg)
172 {
173 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
174 struct kvm_s390_local_interrupt *li;
175 struct kvm_s390_interrupt_info *inti;
176 int rc;
177 u8 tmp;
178
179 /* make sure that the new value is valid memory */
180 address = address & 0x7fffe000u;
181 if ((copy_from_guest(vcpu, &tmp,
182 (u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
183 (copy_from_guest(vcpu, &tmp, (u64) (address +
184 vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
185 *reg |= SIGP_STAT_INVALID_PARAMETER;
186 return 1; /* invalid parameter */
187 }
188
189 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
190 if (!inti)
191 return 2; /* busy */
192
193 spin_lock_bh(&fi->lock);
194 li = fi->local_int[cpu_addr];
195
196 if ((cpu_addr >= KVM_MAX_VCPUS) || (li == NULL)) {
197 rc = 1; /* incorrect state */
198 *reg &= SIGP_STAT_INCORRECT_STATE;
199 kfree(inti);
200 goto out_fi;
201 }
202
203 spin_lock_bh(&li->lock);
204 /* cpu must be in stopped state */
205 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
206 rc = 1; /* incorrect state */
207 *reg &= SIGP_STAT_INCORRECT_STATE;
208 kfree(inti);
209 goto out_li;
210 }
211
212 inti->type = KVM_S390_SIGP_SET_PREFIX;
213 inti->prefix.address = address;
214
215 list_add_tail(&inti->list, &li->list);
216 atomic_set(&li->active, 1);
217 if (waitqueue_active(&li->wq))
218 wake_up_interruptible(&li->wq);
219 rc = 0; /* order accepted */
220
221 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
222 out_li:
223 spin_unlock_bh(&li->lock);
224 out_fi:
225 spin_unlock_bh(&fi->lock);
226 return rc;
227 }
228
kvm_s390_handle_sigp(struct kvm_vcpu * vcpu)229 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
230 {
231 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
232 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
233 int base2 = vcpu->arch.sie_block->ipb >> 28;
234 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
235 u32 parameter;
236 u16 cpu_addr = vcpu->arch.guest_gprs[r3];
237 u8 order_code;
238 int rc;
239
240 /* sigp in userspace can exit */
241 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
242 return kvm_s390_inject_program_int(vcpu,
243 PGM_PRIVILEGED_OPERATION);
244
245 order_code = disp2;
246 if (base2)
247 order_code += vcpu->arch.guest_gprs[base2];
248
249 if (r1 % 2)
250 parameter = vcpu->arch.guest_gprs[r1];
251 else
252 parameter = vcpu->arch.guest_gprs[r1 + 1];
253
254 switch (order_code) {
255 case SIGP_SENSE:
256 vcpu->stat.instruction_sigp_sense++;
257 rc = __sigp_sense(vcpu, cpu_addr,
258 &vcpu->arch.guest_gprs[r1]);
259 break;
260 case SIGP_EMERGENCY:
261 vcpu->stat.instruction_sigp_emergency++;
262 rc = __sigp_emergency(vcpu, cpu_addr);
263 break;
264 case SIGP_STOP:
265 vcpu->stat.instruction_sigp_stop++;
266 rc = __sigp_stop(vcpu, cpu_addr, 0);
267 break;
268 case SIGP_STOP_STORE_STATUS:
269 vcpu->stat.instruction_sigp_stop++;
270 rc = __sigp_stop(vcpu, cpu_addr, 1);
271 break;
272 case SIGP_SET_ARCH:
273 vcpu->stat.instruction_sigp_arch++;
274 rc = __sigp_set_arch(vcpu, parameter);
275 break;
276 case SIGP_SET_PREFIX:
277 vcpu->stat.instruction_sigp_prefix++;
278 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
279 &vcpu->arch.guest_gprs[r1]);
280 break;
281 case SIGP_RESTART:
282 vcpu->stat.instruction_sigp_restart++;
283 /* user space must know about restart */
284 default:
285 return -ENOTSUPP;
286 }
287
288 if (rc < 0)
289 return rc;
290
291 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
292 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
293 return 0;
294 }
295