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14#include <linux/kvm.h>
15#include <linux/kvm_host.h>
16#include "gaccess.h"
17#include "kvm-s390.h"
18
19
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
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
46static 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;
54
55 spin_lock_bh(&fi->lock);
56 if (fi->local_int[cpu_addr] == NULL)
57 rc = 3;
58 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
59 & CPUSTAT_RUNNING) {
60 *reg &= 0xffffffff00000000UL;
61 rc = 1;
62 } else {
63 *reg &= 0xffffffff00000000UL;
64 *reg |= SIGP_STAT_STOPPED;
65 rc = 1;
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
73static 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;
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;
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;
104unlock:
105 spin_unlock_bh(&fi->lock);
106 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
107 return rc;
108}
109
110static 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;
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;
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;
144unlock:
145 spin_unlock_bh(&fi->lock);
146 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
147 return rc;
148}
149
150static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
151{
152 int rc;
153
154 switch (parameter & 0xff) {
155 case 0:
156 rc = 3;
157 break;
158 case 1:
159 case 2:
160 rc = 0;
161 break;
162 default:
163 rc = -ENOTSUPP;
164 }
165 return rc;
166}
167
168static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
169 unsigned long *reg)
170{
171 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
172 struct kvm_s390_local_interrupt *li;
173 struct kvm_s390_interrupt_info *inti;
174 int rc;
175 u8 tmp;
176
177
178 address = address & 0x7fffe000u;
179 if ((copy_from_guest(vcpu, &tmp,
180 (u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
181 (copy_from_guest(vcpu, &tmp, (u64) (address +
182 vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
183 *reg |= SIGP_STAT_INVALID_PARAMETER;
184 return 1;
185 }
186
187 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
188 if (!inti)
189 return 2;
190
191 spin_lock_bh(&fi->lock);
192 li = fi->local_int[cpu_addr];
193
194 if ((cpu_addr >= KVM_MAX_VCPUS) || (li == NULL)) {
195 rc = 1;
196 *reg &= SIGP_STAT_INCORRECT_STATE;
197 kfree(inti);
198 goto out_fi;
199 }
200
201 spin_lock_bh(&li->lock);
202
203 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
204 rc = 1;
205 *reg &= SIGP_STAT_INCORRECT_STATE;
206 kfree(inti);
207 goto out_li;
208 }
209
210 inti->type = KVM_S390_SIGP_SET_PREFIX;
211 inti->prefix.address = address;
212
213 list_add_tail(&inti->list, &li->list);
214 atomic_set(&li->active, 1);
215 if (waitqueue_active(&li->wq))
216 wake_up_interruptible(&li->wq);
217 rc = 0;
218
219 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
220out_li:
221 spin_unlock_bh(&li->lock);
222out_fi:
223 spin_unlock_bh(&fi->lock);
224 return rc;
225}
226
227int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
228{
229 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
230 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
231 int base2 = vcpu->arch.sie_block->ipb >> 28;
232 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
233 u32 parameter;
234 u16 cpu_addr = vcpu->arch.guest_gprs[r3];
235 u8 order_code;
236 int rc;
237
238
239 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
240 return kvm_s390_inject_program_int(vcpu,
241 PGM_PRIVILEGED_OPERATION);
242
243 order_code = disp2;
244 if (base2)
245 order_code += vcpu->arch.guest_gprs[base2];
246
247 if (r1 % 2)
248 parameter = vcpu->arch.guest_gprs[r1];
249 else
250 parameter = vcpu->arch.guest_gprs[r1 + 1];
251
252 switch (order_code) {
253 case SIGP_SENSE:
254 vcpu->stat.instruction_sigp_sense++;
255 rc = __sigp_sense(vcpu, cpu_addr,
256 &vcpu->arch.guest_gprs[r1]);
257 break;
258 case SIGP_EMERGENCY:
259 vcpu->stat.instruction_sigp_emergency++;
260 rc = __sigp_emergency(vcpu, cpu_addr);
261 break;
262 case SIGP_STOP:
263 vcpu->stat.instruction_sigp_stop++;
264 rc = __sigp_stop(vcpu, cpu_addr, 0);
265 break;
266 case SIGP_STOP_STORE_STATUS:
267 vcpu->stat.instruction_sigp_stop++;
268 rc = __sigp_stop(vcpu, cpu_addr, 1);
269 break;
270 case SIGP_SET_ARCH:
271 vcpu->stat.instruction_sigp_arch++;
272 rc = __sigp_set_arch(vcpu, parameter);
273 break;
274 case SIGP_SET_PREFIX:
275 vcpu->stat.instruction_sigp_prefix++;
276 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
277 &vcpu->arch.guest_gprs[r1]);
278 break;
279 case SIGP_RESTART:
280 vcpu->stat.instruction_sigp_restart++;
281
282 default:
283 return -ENOTSUPP;
284 }
285
286 if (rc < 0)
287 return rc;
288
289 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
290 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
291 return 0;
292}
293
