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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
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
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
48static 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;
56
57 spin_lock(&fi->lock);
58 if (fi->local_int[cpu_addr] == NULL)
59 rc = 3;
60 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
61 & CPUSTAT_RUNNING) {
62 *reg &= 0xffffffff00000000UL;
63 rc = 1;
64 } else {
65 *reg &= 0xffffffff00000000UL;
66 *reg |= SIGP_STAT_STOPPED;
67 rc = 1;
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
75static 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;
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;
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;
106unlock:
107 spin_unlock(&fi->lock);
108 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
109 return rc;
110}
111
112static 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_ATOMIC);
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;
131}
132
133static 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;
141
142 spin_lock(&fi->lock);
143 li = fi->local_int[cpu_addr];
144 if (li == NULL) {
145 rc = 3;
146 goto unlock;
147 }
148
149 rc = __inject_sigp_stop(li, action);
150
151unlock:
152 spin_unlock(&fi->lock);
153 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
154 return rc;
155}
156
157int 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
163static 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;
170 break;
171 case 1:
172 case 2:
173 rc = 0;
174 break;
175 default:
176 rc = -EOPNOTSUPP;
177 }
178 return rc;
179}
180
181static 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
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;
198 }
199
200 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
201 if (!inti)
202 return 2;
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;
210 *reg &= SIGP_STAT_INCORRECT_STATE;
211 kfree(inti);
212 goto out_fi;
213 }
214
215 spin_lock_bh(&li->lock);
216
217 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
218 rc = 1;
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;
232
233 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
234out_li:
235 spin_unlock_bh(&li->lock);
236out_fi:
237 spin_unlock(&fi->lock);
238 return rc;
239}
240
241int 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
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
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}
307
