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453423dc CB |
1 | /* |
2 | * priv.c - handling privileged instructions | |
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/errno.h> | |
16 | #include <asm/current.h> | |
17 | #include <asm/debug.h> | |
18 | #include <asm/ebcdic.h> | |
19 | #include <asm/sysinfo.h> | |
20 | #include "gaccess.h" | |
21 | #include "kvm-s390.h" | |
22 | ||
23 | static int handle_set_prefix(struct kvm_vcpu *vcpu) | |
24 | { | |
25 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
26 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
27 | u64 operand2; | |
28 | u32 address = 0; | |
29 | u8 tmp; | |
30 | ||
31 | vcpu->stat.instruction_spx++; | |
32 | ||
33 | operand2 = disp2; | |
34 | if (base2) | |
35 | operand2 += vcpu->arch.guest_gprs[base2]; | |
36 | ||
37 | /* must be word boundary */ | |
38 | if (operand2 & 3) { | |
39 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
40 | goto out; | |
41 | } | |
42 | ||
43 | /* get the value */ | |
44 | if (get_guest_u32(vcpu, operand2, &address)) { | |
45 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
46 | goto out; | |
47 | } | |
48 | ||
49 | address = address & 0x7fffe000u; | |
50 | ||
51 | /* make sure that the new value is valid memory */ | |
52 | if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || | |
53 | (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) { | |
54 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
55 | goto out; | |
56 | } | |
57 | ||
58 | vcpu->arch.sie_block->prefix = address; | |
59 | vcpu->arch.sie_block->ihcpu = 0xffff; | |
60 | ||
61 | VCPU_EVENT(vcpu, 5, "setting prefix to %x", address); | |
62 | out: | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static int handle_store_prefix(struct kvm_vcpu *vcpu) | |
67 | { | |
68 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
69 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
70 | u64 operand2; | |
71 | u32 address; | |
72 | ||
73 | vcpu->stat.instruction_stpx++; | |
74 | operand2 = disp2; | |
75 | if (base2) | |
76 | operand2 += vcpu->arch.guest_gprs[base2]; | |
77 | ||
78 | /* must be word boundary */ | |
79 | if (operand2 & 3) { | |
80 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
81 | goto out; | |
82 | } | |
83 | ||
84 | address = vcpu->arch.sie_block->prefix; | |
85 | address = address & 0x7fffe000u; | |
86 | ||
87 | /* get the value */ | |
88 | if (put_guest_u32(vcpu, operand2, address)) { | |
89 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
90 | goto out; | |
91 | } | |
92 | ||
93 | VCPU_EVENT(vcpu, 5, "storing prefix to %x", address); | |
94 | out: | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static int handle_store_cpu_address(struct kvm_vcpu *vcpu) | |
99 | { | |
100 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
101 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
102 | u64 useraddr; | |
103 | int rc; | |
104 | ||
105 | vcpu->stat.instruction_stap++; | |
106 | useraddr = disp2; | |
107 | if (base2) | |
108 | useraddr += vcpu->arch.guest_gprs[base2]; | |
109 | ||
110 | if (useraddr & 1) { | |
111 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
112 | goto out; | |
113 | } | |
114 | ||
115 | rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id); | |
116 | if (rc == -EFAULT) { | |
117 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
118 | goto out; | |
119 | } | |
120 | ||
121 | VCPU_EVENT(vcpu, 5, "storing cpu address to %lx", useraddr); | |
122 | out: | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int handle_skey(struct kvm_vcpu *vcpu) | |
127 | { | |
128 | vcpu->stat.instruction_storage_key++; | |
129 | vcpu->arch.sie_block->gpsw.addr -= 4; | |
130 | VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int handle_stsch(struct kvm_vcpu *vcpu) | |
135 | { | |
136 | vcpu->stat.instruction_stsch++; | |
137 | VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3"); | |
138 | /* condition code 3 */ | |
139 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
140 | vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int handle_chsc(struct kvm_vcpu *vcpu) | |
145 | { | |
146 | vcpu->stat.instruction_chsc++; | |
147 | VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3"); | |
148 | /* condition code 3 */ | |
149 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
150 | vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static unsigned int stfl(void) | |
155 | { | |
156 | asm volatile( | |
157 | " .insn s,0xb2b10000,0(0)\n" /* stfl */ | |
158 | "0:\n" | |
159 | EX_TABLE(0b, 0b)); | |
160 | return S390_lowcore.stfl_fac_list; | |
161 | } | |
162 | ||
163 | static int handle_stfl(struct kvm_vcpu *vcpu) | |
164 | { | |
165 | unsigned int facility_list = stfl(); | |
166 | int rc; | |
167 | ||
168 | vcpu->stat.instruction_stfl++; | |
169 | facility_list &= ~(1UL<<24); /* no stfle */ | |
170 | ||
171 | rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list), | |
172 | &facility_list, sizeof(facility_list)); | |
173 | if (rc == -EFAULT) | |
174 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
175 | else | |
176 | VCPU_EVENT(vcpu, 5, "store facility list value %x", | |
177 | facility_list); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int handle_stidp(struct kvm_vcpu *vcpu) | |
182 | { | |
183 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
184 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
185 | u64 operand2; | |
186 | int rc; | |
187 | ||
188 | vcpu->stat.instruction_stidp++; | |
189 | operand2 = disp2; | |
190 | if (base2) | |
191 | operand2 += vcpu->arch.guest_gprs[base2]; | |
192 | ||
193 | if (operand2 & 7) { | |
194 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
195 | goto out; | |
196 | } | |
197 | ||
198 | rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data); | |
199 | if (rc == -EFAULT) { | |
200 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
201 | goto out; | |
202 | } | |
203 | ||
204 | VCPU_EVENT(vcpu, 5, "%s", "store cpu id"); | |
205 | out: | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) | |
210 | { | |
211 | struct float_interrupt *fi = &vcpu->kvm->arch.float_int; | |
212 | int cpus = 0; | |
213 | int n; | |
214 | ||
215 | spin_lock_bh(&fi->lock); | |
216 | for (n = 0; n < KVM_MAX_VCPUS; n++) | |
217 | if (fi->local_int[n]) | |
218 | cpus++; | |
219 | spin_unlock_bh(&fi->lock); | |
220 | ||
221 | /* deal with other level 3 hypervisors */ | |
222 | if (stsi(mem, 3, 2, 2) == -ENOSYS) | |
223 | mem->count = 0; | |
224 | if (mem->count < 8) | |
225 | mem->count++; | |
226 | for (n = mem->count - 1; n > 0 ; n--) | |
227 | memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); | |
228 | ||
229 | mem->vm[0].cpus_total = cpus; | |
230 | mem->vm[0].cpus_configured = cpus; | |
231 | mem->vm[0].cpus_standby = 0; | |
232 | mem->vm[0].cpus_reserved = 0; | |
233 | mem->vm[0].caf = 1000; | |
234 | memcpy(mem->vm[0].name, "KVMguest", 8); | |
235 | ASCEBC(mem->vm[0].name, 8); | |
236 | memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); | |
237 | ASCEBC(mem->vm[0].cpi, 16); | |
238 | } | |
239 | ||
240 | static int handle_stsi(struct kvm_vcpu *vcpu) | |
241 | { | |
242 | int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28; | |
243 | int sel1 = vcpu->arch.guest_gprs[0] & 0xff; | |
244 | int sel2 = vcpu->arch.guest_gprs[1] & 0xffff; | |
245 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
246 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
247 | u64 operand2; | |
248 | unsigned long mem; | |
249 | ||
250 | vcpu->stat.instruction_stsi++; | |
251 | VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2); | |
252 | ||
253 | operand2 = disp2; | |
254 | if (base2) | |
255 | operand2 += vcpu->arch.guest_gprs[base2]; | |
256 | ||
257 | if (operand2 & 0xfff && fc > 0) | |
258 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
259 | ||
260 | switch (fc) { | |
261 | case 0: | |
262 | vcpu->arch.guest_gprs[0] = 3 << 28; | |
263 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
264 | return 0; | |
265 | case 1: /* same handling for 1 and 2 */ | |
266 | case 2: | |
267 | mem = get_zeroed_page(GFP_KERNEL); | |
268 | if (!mem) | |
269 | goto out_fail; | |
270 | if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS) | |
271 | goto out_mem; | |
272 | break; | |
273 | case 3: | |
274 | if (sel1 != 2 || sel2 != 2) | |
275 | goto out_fail; | |
276 | mem = get_zeroed_page(GFP_KERNEL); | |
277 | if (!mem) | |
278 | goto out_fail; | |
279 | handle_stsi_3_2_2(vcpu, (void *) mem); | |
280 | break; | |
281 | default: | |
282 | goto out_fail; | |
283 | } | |
284 | ||
285 | if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) { | |
286 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
287 | goto out_mem; | |
288 | } | |
289 | free_page(mem); | |
290 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
291 | vcpu->arch.guest_gprs[0] = 0; | |
292 | return 0; | |
293 | out_mem: | |
294 | free_page(mem); | |
295 | out_fail: | |
296 | /* condition code 3 */ | |
297 | vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static intercept_handler_t priv_handlers[256] = { | |
302 | [0x02] = handle_stidp, | |
303 | [0x10] = handle_set_prefix, | |
304 | [0x11] = handle_store_prefix, | |
305 | [0x12] = handle_store_cpu_address, | |
306 | [0x29] = handle_skey, | |
307 | [0x2a] = handle_skey, | |
308 | [0x2b] = handle_skey, | |
309 | [0x34] = handle_stsch, | |
310 | [0x5f] = handle_chsc, | |
311 | [0x7d] = handle_stsi, | |
312 | [0xb1] = handle_stfl, | |
313 | }; | |
314 | ||
315 | int kvm_s390_handle_priv(struct kvm_vcpu *vcpu) | |
316 | { | |
317 | intercept_handler_t handler; | |
318 | ||
319 | handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; | |
320 | if (handler) | |
321 | return handler(vcpu); | |
322 | return -ENOTSUPP; | |
323 | } |