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14#include <linux/kvm.h>
15#include <linux/gfp.h>
16#include <linux/errno.h>
17#include <asm/current.h>
18#include <asm/debug.h>
19#include <asm/ebcdic.h>
20#include <asm/sysinfo.h>
21#include "gaccess.h"
22#include "kvm-s390.h"
23
24static int handle_set_prefix(struct kvm_vcpu *vcpu)
25{
26 int base2 = vcpu->arch.sie_block->ipb >> 28;
27 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
28 u64 operand2;
29 u32 address = 0;
30 u8 tmp;
31
32 vcpu->stat.instruction_spx++;
33
34 operand2 = disp2;
35 if (base2)
36 operand2 += vcpu->arch.guest_gprs[base2];
37
38
39 if (operand2 & 3) {
40 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
41 goto out;
42 }
43
44
45 if (get_guest_u32(vcpu, operand2, &address)) {
46 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
47 goto out;
48 }
49
50 address = address & 0x7fffe000u;
51
52
53 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
54 (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) {
55 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
56 goto out;
57 }
58
59 vcpu->arch.sie_block->prefix = address;
60 vcpu->arch.sie_block->ihcpu = 0xffff;
61
62 VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
63out:
64 return 0;
65}
66
67static int handle_store_prefix(struct kvm_vcpu *vcpu)
68{
69 int base2 = vcpu->arch.sie_block->ipb >> 28;
70 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
71 u64 operand2;
72 u32 address;
73
74 vcpu->stat.instruction_stpx++;
75 operand2 = disp2;
76 if (base2)
77 operand2 += vcpu->arch.guest_gprs[base2];
78
79
80 if (operand2 & 3) {
81 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
82 goto out;
83 }
84
85 address = vcpu->arch.sie_block->prefix;
86 address = address & 0x7fffe000u;
87
88
89 if (put_guest_u32(vcpu, operand2, address)) {
90 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
91 goto out;
92 }
93
94 VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
95out:
96 return 0;
97}
98
99static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
100{
101 int base2 = vcpu->arch.sie_block->ipb >> 28;
102 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
103 u64 useraddr;
104 int rc;
105
106 vcpu->stat.instruction_stap++;
107 useraddr = disp2;
108 if (base2)
109 useraddr += vcpu->arch.guest_gprs[base2];
110
111 if (useraddr & 1) {
112 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
113 goto out;
114 }
115
116 rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
117 if (rc == -EFAULT) {
118 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
119 goto out;
120 }
121
122 VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
123out:
124 return 0;
125}
126
127static int handle_skey(struct kvm_vcpu *vcpu)
128{
129 vcpu->stat.instruction_storage_key++;
130 vcpu->arch.sie_block->gpsw.addr -= 4;
131 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
132 return 0;
133}
134
135static int handle_stsch(struct kvm_vcpu *vcpu)
136{
137 vcpu->stat.instruction_stsch++;
138 VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3");
139
140 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
141 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
142 return 0;
143}
144
145static int handle_chsc(struct kvm_vcpu *vcpu)
146{
147 vcpu->stat.instruction_chsc++;
148 VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3");
149
150 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
151 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
152 return 0;
153}
154
155static int handle_stfl(struct kvm_vcpu *vcpu)
156{
157 unsigned int facility_list;
158 int rc;
159
160 vcpu->stat.instruction_stfl++;
161
162 facility_list = S390_lowcore.stfl_fac_list & 0xff00fff3;
163
164 rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
165 &facility_list, sizeof(facility_list));
166 if (rc == -EFAULT)
167 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
168 else
169 VCPU_EVENT(vcpu, 5, "store facility list value %x",
170 facility_list);
171 return 0;
172}
173
174static int handle_stidp(struct kvm_vcpu *vcpu)
175{
176 int base2 = vcpu->arch.sie_block->ipb >> 28;
177 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
178 u64 operand2;
179 int rc;
180
181 vcpu->stat.instruction_stidp++;
182 operand2 = disp2;
183 if (base2)
184 operand2 += vcpu->arch.guest_gprs[base2];
185
186 if (operand2 & 7) {
187 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
188 goto out;
189 }
190
191 rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
192 if (rc == -EFAULT) {
193 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
194 goto out;
195 }
196
197 VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
198out:
199 return 0;
200}
201
202static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
203{
204 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
205 int cpus = 0;
206 int n;
207
208 spin_lock(&fi->lock);
209 for (n = 0; n < KVM_MAX_VCPUS; n++)
210 if (fi->local_int[n])
211 cpus++;
212 spin_unlock(&fi->lock);
213
214
215 if (stsi(mem, 3, 2, 2) == -ENOSYS)
216 mem->count = 0;
217 if (mem->count < 8)
218 mem->count++;
219 for (n = mem->count - 1; n > 0 ; n--)
220 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
221
222 mem->vm[0].cpus_total = cpus;
223 mem->vm[0].cpus_configured = cpus;
224 mem->vm[0].cpus_standby = 0;
225 mem->vm[0].cpus_reserved = 0;
226 mem->vm[0].caf = 1000;
227 memcpy(mem->vm[0].name, "KVMguest", 8);
228 ASCEBC(mem->vm[0].name, 8);
229 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
230 ASCEBC(mem->vm[0].cpi, 16);
231}
232
233static int handle_stsi(struct kvm_vcpu *vcpu)
234{
235 int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28;
236 int sel1 = vcpu->arch.guest_gprs[0] & 0xff;
237 int sel2 = vcpu->arch.guest_gprs[1] & 0xffff;
238 int base2 = vcpu->arch.sie_block->ipb >> 28;
239 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
240 u64 operand2;
241 unsigned long mem;
242
243 vcpu->stat.instruction_stsi++;
244 VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
245
246 operand2 = disp2;
247 if (base2)
248 operand2 += vcpu->arch.guest_gprs[base2];
249
250 if (operand2 & 0xfff && fc > 0)
251 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
252
253 switch (fc) {
254 case 0:
255 vcpu->arch.guest_gprs[0] = 3 << 28;
256 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
257 return 0;
258 case 1:
259 case 2:
260 mem = get_zeroed_page(GFP_KERNEL);
261 if (!mem)
262 goto out_fail;
263 if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS)
264 goto out_mem;
265 break;
266 case 3:
267 if (sel1 != 2 || sel2 != 2)
268 goto out_fail;
269 mem = get_zeroed_page(GFP_KERNEL);
270 if (!mem)
271 goto out_fail;
272 handle_stsi_3_2_2(vcpu, (void *) mem);
273 break;
274 default:
275 goto out_fail;
276 }
277
278 if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
279 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
280 goto out_mem;
281 }
282 free_page(mem);
283 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
284 vcpu->arch.guest_gprs[0] = 0;
285 return 0;
286out_mem:
287 free_page(mem);
288out_fail:
289
290 vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
291 return 0;
292}
293
294static intercept_handler_t priv_handlers[256] = {
295 [0x02] = handle_stidp,
296 [0x10] = handle_set_prefix,
297 [0x11] = handle_store_prefix,
298 [0x12] = handle_store_cpu_address,
299 [0x29] = handle_skey,
300 [0x2a] = handle_skey,
301 [0x2b] = handle_skey,
302 [0x34] = handle_stsch,
303 [0x5f] = handle_chsc,
304 [0x7d] = handle_stsi,
305 [0xb1] = handle_stfl,
306};
307
308int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
309{
310 intercept_handler_t handler;
311
312
313
314
315
316
317
318
319 handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
320 if (handler) {
321 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
322 return kvm_s390_inject_program_int(vcpu,
323 PGM_PRIVILEGED_OPERATION);
324 else
325 return handler(vcpu);
326 }
327 return -EOPNOTSUPP;
328}
329
