blob: 28c55677eb399c33f472a564d596666f01bcedd3 [file] [log] [blame]
Christian Borntraeger453423d2008-03-25 18:47:29 +01001/*
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
23static 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);
62out:
63 return 0;
64}
65
66static 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);
94out:
95 return 0;
96}
97
98static 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
Heiko Carstens33e19112009-01-09 12:14:56 +0100121 VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
Christian Borntraeger453423d2008-03-25 18:47:29 +0100122out:
123 return 0;
124}
125
126static 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
134static 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
144static 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
Christian Borntraeger453423d2008-03-25 18:47:29 +0100154static int handle_stfl(struct kvm_vcpu *vcpu)
155{
Heiko Carstens484875b2008-04-30 13:38:43 +0200156 unsigned int facility_list = stfl();
Christian Borntraeger453423d2008-03-25 18:47:29 +0100157 int rc;
158
159 vcpu->stat.instruction_stfl++;
Christian Borntraegera0046b62008-08-29 13:29:45 +0200160 /* only pass the facility bits, which we can handle */
Christian Borntraegeref50f7a2009-06-23 17:24:07 +0200161 facility_list &= 0xff00fff3;
Christian Borntraeger453423d2008-03-25 18:47:29 +0100162
163 rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
164 &facility_list, sizeof(facility_list));
165 if (rc == -EFAULT)
166 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
167 else
168 VCPU_EVENT(vcpu, 5, "store facility list value %x",
169 facility_list);
170 return 0;
171}
172
173static int handle_stidp(struct kvm_vcpu *vcpu)
174{
175 int base2 = vcpu->arch.sie_block->ipb >> 28;
176 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
177 u64 operand2;
178 int rc;
179
180 vcpu->stat.instruction_stidp++;
181 operand2 = disp2;
182 if (base2)
183 operand2 += vcpu->arch.guest_gprs[base2];
184
185 if (operand2 & 7) {
186 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
187 goto out;
188 }
189
190 rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
191 if (rc == -EFAULT) {
192 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
193 goto out;
194 }
195
196 VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
197out:
198 return 0;
199}
200
201static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
202{
Christian Borntraeger180c12f2008-06-27 15:05:40 +0200203 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
Christian Borntraeger453423d2008-03-25 18:47:29 +0100204 int cpus = 0;
205 int n;
206
Christian Borntraegerb037a4f2009-05-12 17:21:50 +0200207 spin_lock(&fi->lock);
Christian Borntraeger453423d2008-03-25 18:47:29 +0100208 for (n = 0; n < KVM_MAX_VCPUS; n++)
209 if (fi->local_int[n])
210 cpus++;
Christian Borntraegerb037a4f2009-05-12 17:21:50 +0200211 spin_unlock(&fi->lock);
Christian Borntraeger453423d2008-03-25 18:47:29 +0100212
213 /* deal with other level 3 hypervisors */
214 if (stsi(mem, 3, 2, 2) == -ENOSYS)
215 mem->count = 0;
216 if (mem->count < 8)
217 mem->count++;
218 for (n = mem->count - 1; n > 0 ; n--)
219 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
220
221 mem->vm[0].cpus_total = cpus;
222 mem->vm[0].cpus_configured = cpus;
223 mem->vm[0].cpus_standby = 0;
224 mem->vm[0].cpus_reserved = 0;
225 mem->vm[0].caf = 1000;
226 memcpy(mem->vm[0].name, "KVMguest", 8);
227 ASCEBC(mem->vm[0].name, 8);
228 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
229 ASCEBC(mem->vm[0].cpi, 16);
230}
231
232static int handle_stsi(struct kvm_vcpu *vcpu)
233{
234 int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28;
235 int sel1 = vcpu->arch.guest_gprs[0] & 0xff;
236 int sel2 = vcpu->arch.guest_gprs[1] & 0xffff;
237 int base2 = vcpu->arch.sie_block->ipb >> 28;
238 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
239 u64 operand2;
240 unsigned long mem;
241
242 vcpu->stat.instruction_stsi++;
243 VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
244
245 operand2 = disp2;
246 if (base2)
247 operand2 += vcpu->arch.guest_gprs[base2];
248
249 if (operand2 & 0xfff && fc > 0)
250 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
251
252 switch (fc) {
253 case 0:
254 vcpu->arch.guest_gprs[0] = 3 << 28;
255 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
256 return 0;
257 case 1: /* same handling for 1 and 2 */
258 case 2:
259 mem = get_zeroed_page(GFP_KERNEL);
260 if (!mem)
261 goto out_fail;
262 if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS)
263 goto out_mem;
264 break;
265 case 3:
266 if (sel1 != 2 || sel2 != 2)
267 goto out_fail;
268 mem = get_zeroed_page(GFP_KERNEL);
269 if (!mem)
270 goto out_fail;
271 handle_stsi_3_2_2(vcpu, (void *) mem);
272 break;
273 default:
274 goto out_fail;
275 }
276
277 if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
278 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
279 goto out_mem;
280 }
281 free_page(mem);
282 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
283 vcpu->arch.guest_gprs[0] = 0;
284 return 0;
285out_mem:
286 free_page(mem);
287out_fail:
288 /* condition code 3 */
289 vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
290 return 0;
291}
292
293static intercept_handler_t priv_handlers[256] = {
294 [0x02] = handle_stidp,
295 [0x10] = handle_set_prefix,
296 [0x11] = handle_store_prefix,
297 [0x12] = handle_store_cpu_address,
298 [0x29] = handle_skey,
299 [0x2a] = handle_skey,
300 [0x2b] = handle_skey,
301 [0x34] = handle_stsch,
302 [0x5f] = handle_chsc,
303 [0x7d] = handle_stsi,
304 [0xb1] = handle_stfl,
305};
306
Christian Borntraeger70455a32009-01-22 10:28:29 +0100307int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
Christian Borntraeger453423d2008-03-25 18:47:29 +0100308{
309 intercept_handler_t handler;
310
Christian Borntraeger70455a32009-01-22 10:28:29 +0100311 /*
312 * a lot of B2 instructions are priviledged. We first check for
313 * the priviledges ones, that we can handle in the kernel. If the
314 * kernel can handle this instruction, we check for the problem
315 * state bit and (a) handle the instruction or (b) send a code 2
316 * program check.
317 * Anything else goes to userspace.*/
Christian Borntraeger453423d2008-03-25 18:47:29 +0100318 handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
Christian Borntraeger70455a32009-01-22 10:28:29 +0100319 if (handler) {
320 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
321 return kvm_s390_inject_program_int(vcpu,
322 PGM_PRIVILEGED_OPERATION);
323 else
324 return handler(vcpu);
325 }
Heiko Carstensb8e660b2010-02-26 22:37:41 +0100326 return -EOPNOTSUPP;
Christian Borntraeger453423d2008-03-25 18:47:29 +0100327}