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15#include <linux/kvm.h>
16#include <linux/kvm_host.h>
17#include "gaccess.h"
18#include "kvm-s390.h"
19
20
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
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
47static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
48 unsigned long *reg)
49{
50 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
51 int rc;
52
53 if (cpu_addr >= KVM_MAX_VCPUS)
54 return 3;
55
56 spin_lock(&fi->lock);
57 if (fi->local_int[cpu_addr] == NULL)
58 rc = 3;
59 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
60 & CPUSTAT_RUNNING) {
61 *reg &= 0xffffffff00000000UL;
62 rc = 1;
63 } else {
64 *reg &= 0xffffffff00000000UL;
65 *reg |= SIGP_STAT_STOPPED;
66 rc = 1;
67 }
68 spin_unlock(&fi->lock);
69
70 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
71 return rc;
72}
73
74static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
75{
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;
79 int rc;
80
81 if (cpu_addr >= KVM_MAX_VCPUS)
82 return 3;
83
84 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
85 if (!inti)
86 return -ENOMEM;
87
88 inti->type = KVM_S390_INT_EMERGENCY;
89
90 spin_lock(&fi->lock);
91 li = fi->local_int[cpu_addr];
92 if (li == NULL) {
93 rc = 3;
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;
105unlock:
106 spin_unlock(&fi->lock);
107 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
108 return rc;
109}
110
111static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
112{
113 struct kvm_s390_interrupt_info *inti;
114
115 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
116 if (!inti)
117 return -ENOMEM;
118 inti->type = KVM_S390_SIGP_STOP;
119
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);
124 li->action_bits |= action;
125 if (waitqueue_active(&li->wq))
126 wake_up_interruptible(&li->wq);
127 spin_unlock_bh(&li->lock);
128
129 return 0;
130}
131
132static 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;
140
141 spin_lock(&fi->lock);
142 li = fi->local_int[cpu_addr];
143 if (li == NULL) {
144 rc = 3;
145 goto unlock;
146 }
147
148 rc = __inject_sigp_stop(li, action);
149
150unlock:
151 spin_unlock(&fi->lock);
152 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
153 return rc;
154}
155
156int 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
162static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
163{
164 int rc;
165
166 switch (parameter & 0xff) {
167 case 0:
168 rc = 3;
169 break;
170 case 1:
171 case 2:
172 rc = 0;
173 break;
174 default:
175 rc = -ENOTSUPP;
176 }
177 return rc;
178}
179
180static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
181 unsigned long *reg)
182{
183 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
184 struct kvm_s390_local_interrupt *li = NULL;
185 struct kvm_s390_interrupt_info *inti;
186 int rc;
187 u8 tmp;
188
189
190 address = address & 0x7fffe000u;
191 if ((copy_from_guest(vcpu, &tmp,
192 (u64) (address + vcpu->arch.sie_block->gmsor) , 1)) ||
193 (copy_from_guest(vcpu, &tmp, (u64) (address +
194 vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) {
195 *reg |= SIGP_STAT_INVALID_PARAMETER;
196 return 1;
197 }
198
199 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
200 if (!inti)
201 return 2;
202
203 spin_lock(&fi->lock);
204 if (cpu_addr < KVM_MAX_VCPUS)
205 li = fi->local_int[cpu_addr];
206
207 if (li == NULL) {
208 rc = 1;
209 *reg &= SIGP_STAT_INCORRECT_STATE;
210 kfree(inti);
211 goto out_fi;
212 }
213
214 spin_lock_bh(&li->lock);
215
216 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
217 rc = 1;
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;
231
232 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
233out_li:
234 spin_unlock_bh(&li->lock);
235out_fi:
236 spin_unlock(&fi->lock);
237 return rc;
238}
239
240int 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
251
252 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
253 return kvm_s390_inject_program_int(vcpu,
254 PGM_PRIVILEGED_OPERATION);
255
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++;
277 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
278 break;
279 case SIGP_STOP_STORE_STATUS:
280 vcpu->stat.instruction_sigp_stop++;
281 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP);
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
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}
306
