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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> | |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
453423dc CB |
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 | ||
24 | static 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 | /* must be word boundary */ | |
39 | if (operand2 & 3) { | |
40 | kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
41 | goto out; | |
42 | } | |
43 | ||
44 | /* get the value */ | |
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 | /* make sure that the new value is valid memory */ | |
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); | |
63 | out: | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static 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 | /* must be word boundary */ | |
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 | /* get the value */ | |
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); | |
95 | out: | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static 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 | ||
33e19115 | 122 | VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr); |
453423dc CB |
123 | out: |
124 | return 0; | |
125 | } | |
126 | ||
127 | static 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 | ||
135 | static int handle_stsch(struct kvm_vcpu *vcpu) | |
136 | { | |
137 | vcpu->stat.instruction_stsch++; | |
138 | VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3"); | |
139 | /* condition code 3 */ | |
140 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
141 | vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int handle_chsc(struct kvm_vcpu *vcpu) | |
146 | { | |
147 | vcpu->stat.instruction_chsc++; | |
148 | VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3"); | |
149 | /* condition code 3 */ | |
150 | vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); | |
151 | vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; | |
152 | return 0; | |
153 | } | |
154 | ||
453423dc CB |
155 | static int handle_stfl(struct kvm_vcpu *vcpu) |
156 | { | |
14375bc4 | 157 | unsigned int facility_list; |
453423dc CB |
158 | int rc; |
159 | ||
160 | vcpu->stat.instruction_stfl++; | |
a0046b6d | 161 | /* only pass the facility bits, which we can handle */ |
14375bc4 | 162 | facility_list = S390_lowcore.stfl_fac_list & 0xff00fff3; |
453423dc CB |
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 | ||
174 | static 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"); | |
198 | out: | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) | |
203 | { | |
180c12fb | 204 | struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
453423dc CB |
205 | int cpus = 0; |
206 | int n; | |
207 | ||
b037a4f3 | 208 | spin_lock(&fi->lock); |
453423dc CB |
209 | for (n = 0; n < KVM_MAX_VCPUS; n++) |
210 | if (fi->local_int[n]) | |
211 | cpus++; | |
b037a4f3 | 212 | spin_unlock(&fi->lock); |
453423dc CB |
213 | |
214 | /* deal with other level 3 hypervisors */ | |
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 | ||
233 | static 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: /* same handling for 1 and 2 */ | |
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; | |
286 | out_mem: | |
287 | free_page(mem); | |
288 | out_fail: | |
289 | /* condition code 3 */ | |
290 | vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static 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 | ||
70455a36 | 308 | int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) |
453423dc CB |
309 | { |
310 | intercept_handler_t handler; | |
311 | ||
70455a36 CB |
312 | /* |
313 | * a lot of B2 instructions are priviledged. We first check for | |
25985edc | 314 | * the privileged ones, that we can handle in the kernel. If the |
70455a36 CB |
315 | * kernel can handle this instruction, we check for the problem |
316 | * state bit and (a) handle the instruction or (b) send a code 2 | |
317 | * program check. | |
318 | * Anything else goes to userspace.*/ | |
453423dc | 319 | handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; |
70455a36 CB |
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 | } | |
b8e660b8 | 327 | return -EOPNOTSUPP; |
453423dc | 328 | } |