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1/*
2 * in-kernel handling for sie intercepts
3 *
4 * Copyright IBM Corp. 2008, 2014
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_host.h>
15#include <linux/errno.h>
16#include <linux/pagemap.h>
17
18#include <asm/kvm_host.h>
19#include <asm/asm-offsets.h>
20#include <asm/irq.h>
21
22#include "kvm-s390.h"
23#include "gaccess.h"
24#include "trace.h"
25#include "trace-s390.h"
26
27
28static const intercept_handler_t instruction_handlers[256] = {
29 [0x01] = kvm_s390_handle_01,
30 [0x82] = kvm_s390_handle_lpsw,
31 [0x83] = kvm_s390_handle_diag,
32 [0xae] = kvm_s390_handle_sigp,
33 [0xb2] = kvm_s390_handle_b2,
34 [0xb6] = kvm_s390_handle_stctl,
35 [0xb7] = kvm_s390_handle_lctl,
36 [0xb9] = kvm_s390_handle_b9,
37 [0xe5] = kvm_s390_handle_e5,
38 [0xeb] = kvm_s390_handle_eb,
39};
40
41u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
42{
43 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
44 u8 ilen = 0;
45
46 switch (vcpu->arch.sie_block->icptcode) {
47 case ICPT_INST:
48 case ICPT_INSTPROGI:
49 case ICPT_OPEREXC:
50 case ICPT_PARTEXEC:
51 case ICPT_IOINST:
52 /* instruction only stored for these icptcodes */
53 ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
54 /* Use the length of the EXECUTE instruction if necessary */
55 if (sie_block->icptstatus & 1) {
56 ilen = (sie_block->icptstatus >> 4) & 0x6;
57 if (!ilen)
58 ilen = 4;
59 }
60 break;
61 case ICPT_PROGI:
62 /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
63 ilen = vcpu->arch.sie_block->pgmilc & 0x6;
64 break;
65 }
66 return ilen;
67}
68
69static int handle_noop(struct kvm_vcpu *vcpu)
70{
71 switch (vcpu->arch.sie_block->icptcode) {
72 case 0x10:
73 vcpu->stat.exit_external_request++;
74 break;
75 default:
76 break; /* nothing */
77 }
78 return 0;
79}
80
81static int handle_stop(struct kvm_vcpu *vcpu)
82{
83 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
84 int rc = 0;
85 uint8_t flags, stop_pending;
86
87 vcpu->stat.exit_stop_request++;
88
89 /* delay the stop if any non-stop irq is pending */
90 if (kvm_s390_vcpu_has_irq(vcpu, 1))
91 return 0;
92
93 /* avoid races with the injection/SIGP STOP code */
94 spin_lock(&li->lock);
95 flags = li->irq.stop.flags;
96 stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
97 spin_unlock(&li->lock);
98
99 trace_kvm_s390_stop_request(stop_pending, flags);
100 if (!stop_pending)
101 return 0;
102
103 if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
104 rc = kvm_s390_vcpu_store_status(vcpu,
105 KVM_S390_STORE_STATUS_NOADDR);
106 if (rc)
107 return rc;
108 }
109
110 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
111 kvm_s390_vcpu_stop(vcpu);
112 return -EOPNOTSUPP;
113}
114
115static int handle_validity(struct kvm_vcpu *vcpu)
116{
117 int viwhy = vcpu->arch.sie_block->ipb >> 16;
118
119 vcpu->stat.exit_validity++;
120 trace_kvm_s390_intercept_validity(vcpu, viwhy);
121 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
122 return -EOPNOTSUPP;
123}
124
125static int handle_instruction(struct kvm_vcpu *vcpu)
126{
127 intercept_handler_t handler;
128
129 vcpu->stat.exit_instruction++;
130 trace_kvm_s390_intercept_instruction(vcpu,
131 vcpu->arch.sie_block->ipa,
132 vcpu->arch.sie_block->ipb);
133 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
134 if (handler)
135 return handler(vcpu);
136 return -EOPNOTSUPP;
137}
138
139static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
140{
141 struct kvm_s390_pgm_info pgm_info = {
142 .code = vcpu->arch.sie_block->iprcc,
143 /* the PSW has already been rewound */
144 .flags = KVM_S390_PGM_FLAGS_NO_REWIND,
145 };
146
147 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
148 case PGM_AFX_TRANSLATION:
149 case PGM_ASX_TRANSLATION:
150 case PGM_EX_TRANSLATION:
151 case PGM_LFX_TRANSLATION:
152 case PGM_LSTE_SEQUENCE:
153 case PGM_LSX_TRANSLATION:
154 case PGM_LX_TRANSLATION:
155 case PGM_PRIMARY_AUTHORITY:
156 case PGM_SECONDARY_AUTHORITY:
157 case PGM_SPACE_SWITCH:
158 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
159 break;
160 case PGM_ALEN_TRANSLATION:
161 case PGM_ALE_SEQUENCE:
162 case PGM_ASTE_INSTANCE:
163 case PGM_ASTE_SEQUENCE:
164 case PGM_ASTE_VALIDITY:
165 case PGM_EXTENDED_AUTHORITY:
166 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
167 break;
168 case PGM_ASCE_TYPE:
169 case PGM_PAGE_TRANSLATION:
170 case PGM_REGION_FIRST_TRANS:
171 case PGM_REGION_SECOND_TRANS:
172 case PGM_REGION_THIRD_TRANS:
173 case PGM_SEGMENT_TRANSLATION:
174 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
175 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
176 pgm_info.op_access_id = vcpu->arch.sie_block->oai;
177 break;
178 case PGM_MONITOR:
179 pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
180 pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
181 break;
182 case PGM_VECTOR_PROCESSING:
183 case PGM_DATA:
184 pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
185 break;
186 case PGM_PROTECTION:
187 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
188 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
189 break;
190 default:
191 break;
192 }
193
194 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
195 pgm_info.per_code = vcpu->arch.sie_block->perc;
196 pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
197 pgm_info.per_address = vcpu->arch.sie_block->peraddr;
198 pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
199 }
200 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
201}
202
203/*
204 * restore ITDB to program-interruption TDB in guest lowcore
205 * and set TX abort indication if required
206*/
207static int handle_itdb(struct kvm_vcpu *vcpu)
208{
209 struct kvm_s390_itdb *itdb;
210 int rc;
211
212 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
213 return 0;
214 if (current->thread.per_flags & PER_FLAG_NO_TE)
215 return 0;
216 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
217 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
218 if (rc)
219 return rc;
220 memset(itdb, 0, sizeof(*itdb));
221
222 return 0;
223}
224
225#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
226
227static int handle_prog(struct kvm_vcpu *vcpu)
228{
229 psw_t psw;
230 int rc;
231
232 vcpu->stat.exit_program_interruption++;
233
234 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
235 kvm_s390_handle_per_event(vcpu);
236 /* the interrupt might have been filtered out completely */
237 if (vcpu->arch.sie_block->iprcc == 0)
238 return 0;
239 }
240
241 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
242 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
243 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
244 if (rc)
245 return rc;
246 /* Avoid endless loops of specification exceptions */
247 if (!is_valid_psw(&psw))
248 return -EOPNOTSUPP;
249 }
250 rc = handle_itdb(vcpu);
251 if (rc)
252 return rc;
253
254 return inject_prog_on_prog_intercept(vcpu);
255}
256
257/**
258 * handle_external_interrupt - used for external interruption interceptions
259 *
260 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
261 * the new PSW does not have external interrupts disabled. In the first case,
262 * we've got to deliver the interrupt manually, and in the second case, we
263 * drop to userspace to handle the situation there.
264 */
265static int handle_external_interrupt(struct kvm_vcpu *vcpu)
266{
267 u16 eic = vcpu->arch.sie_block->eic;
268 struct kvm_s390_irq irq;
269 psw_t newpsw;
270 int rc;
271
272 vcpu->stat.exit_external_interrupt++;
273
274 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
275 if (rc)
276 return rc;
277 /* We can not handle clock comparator or timer interrupt with bad PSW */
278 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
279 (newpsw.mask & PSW_MASK_EXT))
280 return -EOPNOTSUPP;
281
282 switch (eic) {
283 case EXT_IRQ_CLK_COMP:
284 irq.type = KVM_S390_INT_CLOCK_COMP;
285 break;
286 case EXT_IRQ_CPU_TIMER:
287 irq.type = KVM_S390_INT_CPU_TIMER;
288 break;
289 case EXT_IRQ_EXTERNAL_CALL:
290 irq.type = KVM_S390_INT_EXTERNAL_CALL;
291 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
292 rc = kvm_s390_inject_vcpu(vcpu, &irq);
293 /* ignore if another external call is already pending */
294 if (rc == -EBUSY)
295 return 0;
296 return rc;
297 default:
298 return -EOPNOTSUPP;
299 }
300
301 return kvm_s390_inject_vcpu(vcpu, &irq);
302}
303
304/**
305 * Handle MOVE PAGE partial execution interception.
306 *
307 * This interception can only happen for guests with DAT disabled and
308 * addresses that are currently not mapped in the host. Thus we try to
309 * set up the mappings for the corresponding user pages here (or throw
310 * addressing exceptions in case of illegal guest addresses).
311 */
312static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
313{
314 unsigned long srcaddr, dstaddr;
315 int reg1, reg2, rc;
316
317 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
318
319 /* Make sure that the source is paged-in */
320 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
321 reg2, &srcaddr, GACC_FETCH);
322 if (rc)
323 return kvm_s390_inject_prog_cond(vcpu, rc);
324 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
325 if (rc != 0)
326 return rc;
327
328 /* Make sure that the destination is paged-in */
329 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
330 reg1, &dstaddr, GACC_STORE);
331 if (rc)
332 return kvm_s390_inject_prog_cond(vcpu, rc);
333 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
334 if (rc != 0)
335 return rc;
336
337 kvm_s390_retry_instr(vcpu);
338
339 return 0;
340}
341
342static int handle_partial_execution(struct kvm_vcpu *vcpu)
343{
344 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
345 return handle_mvpg_pei(vcpu);
346 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
347 return kvm_s390_handle_sigp_pei(vcpu);
348
349 return -EOPNOTSUPP;
350}
351
352int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
353{
354 if (kvm_is_ucontrol(vcpu->kvm))
355 return -EOPNOTSUPP;
356
357 switch (vcpu->arch.sie_block->icptcode) {
358 case 0x10:
359 case 0x18:
360 return handle_noop(vcpu);
361 case 0x04:
362 return handle_instruction(vcpu);
363 case 0x08:
364 return handle_prog(vcpu);
365 case 0x14:
366 return handle_external_interrupt(vcpu);
367 case 0x1c:
368 return kvm_s390_handle_wait(vcpu);
369 case 0x20:
370 return handle_validity(vcpu);
371 case 0x28:
372 return handle_stop(vcpu);
373 case 0x38:
374 return handle_partial_execution(vcpu);
375 default:
376 return -EOPNOTSUPP;
377 }
378}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * in-kernel handling for sie intercepts
4 *
5 * Copyright IBM Corp. 2008, 2014
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 */
10
11#include <linux/kvm_host.h>
12#include <linux/errno.h>
13#include <linux/pagemap.h>
14
15#include <asm/kvm_host.h>
16#include <asm/asm-offsets.h>
17#include <asm/irq.h>
18#include <asm/sysinfo.h>
19
20#include "kvm-s390.h"
21#include "gaccess.h"
22#include "trace.h"
23#include "trace-s390.h"
24
25u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
26{
27 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
28 u8 ilen = 0;
29
30 switch (vcpu->arch.sie_block->icptcode) {
31 case ICPT_INST:
32 case ICPT_INSTPROGI:
33 case ICPT_OPEREXC:
34 case ICPT_PARTEXEC:
35 case ICPT_IOINST:
36 /* instruction only stored for these icptcodes */
37 ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
38 /* Use the length of the EXECUTE instruction if necessary */
39 if (sie_block->icptstatus & 1) {
40 ilen = (sie_block->icptstatus >> 4) & 0x6;
41 if (!ilen)
42 ilen = 4;
43 }
44 break;
45 case ICPT_PROGI:
46 /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
47 ilen = vcpu->arch.sie_block->pgmilc & 0x6;
48 break;
49 }
50 return ilen;
51}
52
53static int handle_stop(struct kvm_vcpu *vcpu)
54{
55 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
56 int rc = 0;
57 uint8_t flags, stop_pending;
58
59 vcpu->stat.exit_stop_request++;
60
61 /* delay the stop if any non-stop irq is pending */
62 if (kvm_s390_vcpu_has_irq(vcpu, 1))
63 return 0;
64
65 /* avoid races with the injection/SIGP STOP code */
66 spin_lock(&li->lock);
67 flags = li->irq.stop.flags;
68 stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
69 spin_unlock(&li->lock);
70
71 trace_kvm_s390_stop_request(stop_pending, flags);
72 if (!stop_pending)
73 return 0;
74
75 if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
76 rc = kvm_s390_vcpu_store_status(vcpu,
77 KVM_S390_STORE_STATUS_NOADDR);
78 if (rc)
79 return rc;
80 }
81
82 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
83 kvm_s390_vcpu_stop(vcpu);
84 return -EOPNOTSUPP;
85}
86
87static int handle_validity(struct kvm_vcpu *vcpu)
88{
89 int viwhy = vcpu->arch.sie_block->ipb >> 16;
90
91 vcpu->stat.exit_validity++;
92 trace_kvm_s390_intercept_validity(vcpu, viwhy);
93 KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
94 current->pid, vcpu->kvm);
95
96 /* do not warn on invalid runtime instrumentation mode */
97 WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
98 viwhy);
99 return -EINVAL;
100}
101
102static int handle_instruction(struct kvm_vcpu *vcpu)
103{
104 vcpu->stat.exit_instruction++;
105 trace_kvm_s390_intercept_instruction(vcpu,
106 vcpu->arch.sie_block->ipa,
107 vcpu->arch.sie_block->ipb);
108
109 switch (vcpu->arch.sie_block->ipa >> 8) {
110 case 0x01:
111 return kvm_s390_handle_01(vcpu);
112 case 0x82:
113 return kvm_s390_handle_lpsw(vcpu);
114 case 0x83:
115 return kvm_s390_handle_diag(vcpu);
116 case 0xaa:
117 return kvm_s390_handle_aa(vcpu);
118 case 0xae:
119 return kvm_s390_handle_sigp(vcpu);
120 case 0xb2:
121 return kvm_s390_handle_b2(vcpu);
122 case 0xb6:
123 return kvm_s390_handle_stctl(vcpu);
124 case 0xb7:
125 return kvm_s390_handle_lctl(vcpu);
126 case 0xb9:
127 return kvm_s390_handle_b9(vcpu);
128 case 0xe3:
129 return kvm_s390_handle_e3(vcpu);
130 case 0xe5:
131 return kvm_s390_handle_e5(vcpu);
132 case 0xeb:
133 return kvm_s390_handle_eb(vcpu);
134 default:
135 return -EOPNOTSUPP;
136 }
137}
138
139static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
140{
141 struct kvm_s390_pgm_info pgm_info = {
142 .code = vcpu->arch.sie_block->iprcc,
143 /* the PSW has already been rewound */
144 .flags = KVM_S390_PGM_FLAGS_NO_REWIND,
145 };
146
147 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
148 case PGM_AFX_TRANSLATION:
149 case PGM_ASX_TRANSLATION:
150 case PGM_EX_TRANSLATION:
151 case PGM_LFX_TRANSLATION:
152 case PGM_LSTE_SEQUENCE:
153 case PGM_LSX_TRANSLATION:
154 case PGM_LX_TRANSLATION:
155 case PGM_PRIMARY_AUTHORITY:
156 case PGM_SECONDARY_AUTHORITY:
157 case PGM_SPACE_SWITCH:
158 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
159 break;
160 case PGM_ALEN_TRANSLATION:
161 case PGM_ALE_SEQUENCE:
162 case PGM_ASTE_INSTANCE:
163 case PGM_ASTE_SEQUENCE:
164 case PGM_ASTE_VALIDITY:
165 case PGM_EXTENDED_AUTHORITY:
166 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
167 break;
168 case PGM_ASCE_TYPE:
169 case PGM_PAGE_TRANSLATION:
170 case PGM_REGION_FIRST_TRANS:
171 case PGM_REGION_SECOND_TRANS:
172 case PGM_REGION_THIRD_TRANS:
173 case PGM_SEGMENT_TRANSLATION:
174 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
175 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
176 pgm_info.op_access_id = vcpu->arch.sie_block->oai;
177 break;
178 case PGM_MONITOR:
179 pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
180 pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
181 break;
182 case PGM_VECTOR_PROCESSING:
183 case PGM_DATA:
184 pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
185 break;
186 case PGM_PROTECTION:
187 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
188 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
189 break;
190 default:
191 break;
192 }
193
194 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
195 pgm_info.per_code = vcpu->arch.sie_block->perc;
196 pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
197 pgm_info.per_address = vcpu->arch.sie_block->peraddr;
198 pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
199 }
200 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
201}
202
203/*
204 * restore ITDB to program-interruption TDB in guest lowcore
205 * and set TX abort indication if required
206*/
207static int handle_itdb(struct kvm_vcpu *vcpu)
208{
209 struct kvm_s390_itdb *itdb;
210 int rc;
211
212 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
213 return 0;
214 if (current->thread.per_flags & PER_FLAG_NO_TE)
215 return 0;
216 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
217 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
218 if (rc)
219 return rc;
220 memset(itdb, 0, sizeof(*itdb));
221
222 return 0;
223}
224
225#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
226
227static int handle_prog(struct kvm_vcpu *vcpu)
228{
229 psw_t psw;
230 int rc;
231
232 vcpu->stat.exit_program_interruption++;
233
234 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
235 rc = kvm_s390_handle_per_event(vcpu);
236 if (rc)
237 return rc;
238 /* the interrupt might have been filtered out completely */
239 if (vcpu->arch.sie_block->iprcc == 0)
240 return 0;
241 }
242
243 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
244 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
245 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
246 if (rc)
247 return rc;
248 /* Avoid endless loops of specification exceptions */
249 if (!is_valid_psw(&psw))
250 return -EOPNOTSUPP;
251 }
252 rc = handle_itdb(vcpu);
253 if (rc)
254 return rc;
255
256 return inject_prog_on_prog_intercept(vcpu);
257}
258
259/**
260 * handle_external_interrupt - used for external interruption interceptions
261 *
262 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
263 * the new PSW does not have external interrupts disabled. In the first case,
264 * we've got to deliver the interrupt manually, and in the second case, we
265 * drop to userspace to handle the situation there.
266 */
267static int handle_external_interrupt(struct kvm_vcpu *vcpu)
268{
269 u16 eic = vcpu->arch.sie_block->eic;
270 struct kvm_s390_irq irq;
271 psw_t newpsw;
272 int rc;
273
274 vcpu->stat.exit_external_interrupt++;
275
276 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
277 if (rc)
278 return rc;
279 /* We can not handle clock comparator or timer interrupt with bad PSW */
280 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
281 (newpsw.mask & PSW_MASK_EXT))
282 return -EOPNOTSUPP;
283
284 switch (eic) {
285 case EXT_IRQ_CLK_COMP:
286 irq.type = KVM_S390_INT_CLOCK_COMP;
287 break;
288 case EXT_IRQ_CPU_TIMER:
289 irq.type = KVM_S390_INT_CPU_TIMER;
290 break;
291 case EXT_IRQ_EXTERNAL_CALL:
292 irq.type = KVM_S390_INT_EXTERNAL_CALL;
293 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
294 rc = kvm_s390_inject_vcpu(vcpu, &irq);
295 /* ignore if another external call is already pending */
296 if (rc == -EBUSY)
297 return 0;
298 return rc;
299 default:
300 return -EOPNOTSUPP;
301 }
302
303 return kvm_s390_inject_vcpu(vcpu, &irq);
304}
305
306/**
307 * Handle MOVE PAGE partial execution interception.
308 *
309 * This interception can only happen for guests with DAT disabled and
310 * addresses that are currently not mapped in the host. Thus we try to
311 * set up the mappings for the corresponding user pages here (or throw
312 * addressing exceptions in case of illegal guest addresses).
313 */
314static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
315{
316 unsigned long srcaddr, dstaddr;
317 int reg1, reg2, rc;
318
319 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
320
321 /* Make sure that the source is paged-in */
322 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
323 reg2, &srcaddr, GACC_FETCH);
324 if (rc)
325 return kvm_s390_inject_prog_cond(vcpu, rc);
326 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
327 if (rc != 0)
328 return rc;
329
330 /* Make sure that the destination is paged-in */
331 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
332 reg1, &dstaddr, GACC_STORE);
333 if (rc)
334 return kvm_s390_inject_prog_cond(vcpu, rc);
335 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
336 if (rc != 0)
337 return rc;
338
339 kvm_s390_retry_instr(vcpu);
340
341 return 0;
342}
343
344static int handle_partial_execution(struct kvm_vcpu *vcpu)
345{
346 vcpu->stat.exit_pei++;
347
348 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
349 return handle_mvpg_pei(vcpu);
350 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
351 return kvm_s390_handle_sigp_pei(vcpu);
352
353 return -EOPNOTSUPP;
354}
355
356/*
357 * Handle the sthyi instruction that provides the guest with system
358 * information, like current CPU resources available at each level of
359 * the machine.
360 */
361int handle_sthyi(struct kvm_vcpu *vcpu)
362{
363 int reg1, reg2, r = 0;
364 u64 code, addr, cc = 0, rc = 0;
365 struct sthyi_sctns *sctns = NULL;
366
367 if (!test_kvm_facility(vcpu->kvm, 74))
368 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
369
370 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
371 code = vcpu->run->s.regs.gprs[reg1];
372 addr = vcpu->run->s.regs.gprs[reg2];
373
374 vcpu->stat.instruction_sthyi++;
375 VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
376 trace_kvm_s390_handle_sthyi(vcpu, code, addr);
377
378 if (reg1 == reg2 || reg1 & 1 || reg2 & 1)
379 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
380
381 if (code & 0xffff) {
382 cc = 3;
383 rc = 4;
384 goto out;
385 }
386
387 if (addr & ~PAGE_MASK)
388 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
389
390 sctns = (void *)get_zeroed_page(GFP_KERNEL);
391 if (!sctns)
392 return -ENOMEM;
393
394 cc = sthyi_fill(sctns, &rc);
395
396out:
397 if (!cc) {
398 r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
399 if (r) {
400 free_page((unsigned long)sctns);
401 return kvm_s390_inject_prog_cond(vcpu, r);
402 }
403 }
404
405 free_page((unsigned long)sctns);
406 vcpu->run->s.regs.gprs[reg2 + 1] = rc;
407 kvm_s390_set_psw_cc(vcpu, cc);
408 return r;
409}
410
411static int handle_operexc(struct kvm_vcpu *vcpu)
412{
413 psw_t oldpsw, newpsw;
414 int rc;
415
416 vcpu->stat.exit_operation_exception++;
417 trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
418 vcpu->arch.sie_block->ipb);
419
420 if (vcpu->arch.sie_block->ipa == 0xb256)
421 return handle_sthyi(vcpu);
422
423 if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
424 return -EOPNOTSUPP;
425 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
426 if (rc)
427 return rc;
428 /*
429 * Avoid endless loops of operation exceptions, if the pgm new
430 * PSW will cause a new operation exception.
431 * The heuristic checks if the pgm new psw is within 6 bytes before
432 * the faulting psw address (with same DAT, AS settings) and the
433 * new psw is not a wait psw and the fault was not triggered by
434 * problem state.
435 */
436 oldpsw = vcpu->arch.sie_block->gpsw;
437 if (oldpsw.addr - newpsw.addr <= 6 &&
438 !(newpsw.mask & PSW_MASK_WAIT) &&
439 !(oldpsw.mask & PSW_MASK_PSTATE) &&
440 (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
441 (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
442 return -EOPNOTSUPP;
443
444 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
445}
446
447int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
448{
449 int rc, per_rc = 0;
450
451 if (kvm_is_ucontrol(vcpu->kvm))
452 return -EOPNOTSUPP;
453
454 switch (vcpu->arch.sie_block->icptcode) {
455 case ICPT_EXTREQ:
456 vcpu->stat.exit_external_request++;
457 return 0;
458 case ICPT_IOREQ:
459 vcpu->stat.exit_io_request++;
460 return 0;
461 case ICPT_INST:
462 rc = handle_instruction(vcpu);
463 break;
464 case ICPT_PROGI:
465 return handle_prog(vcpu);
466 case ICPT_EXTINT:
467 return handle_external_interrupt(vcpu);
468 case ICPT_WAIT:
469 return kvm_s390_handle_wait(vcpu);
470 case ICPT_VALIDITY:
471 return handle_validity(vcpu);
472 case ICPT_STOP:
473 return handle_stop(vcpu);
474 case ICPT_OPEREXC:
475 rc = handle_operexc(vcpu);
476 break;
477 case ICPT_PARTEXEC:
478 rc = handle_partial_execution(vcpu);
479 break;
480 case ICPT_KSS:
481 rc = kvm_s390_skey_check_enable(vcpu);
482 break;
483 default:
484 return -EOPNOTSUPP;
485 }
486
487 /* process PER, also if the instrution is processed in user space */
488 if (vcpu->arch.sie_block->icptstatus & 0x02 &&
489 (!rc || rc == -EOPNOTSUPP))
490 per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
491 return per_rc ? per_rc : rc;
492}