projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / arch / s390 / kvm / intercept.c
CommitLineData
8f2abe6a 1/*
a53c8fab 2 * in-kernel handling for sie intercepts
8f2abe6a 3 *
9a558ee3 4 * Copyright IBM Corp. 2008, 2014
8f2abe6a
CB		 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>
a86dcc24 19#include <asm/asm-offsets.h>
f14d82e0 20#include <asm/irq.h>
8f2abe6a
CB		 21
22#include "kvm-s390.h"
ba5c1e9b 23#include "gaccess.h"
5786fffa 24#include "trace.h"
ade38c31 25#include "trace-s390.h"
ba5c1e9b 26
f379aae5 27
77975357 28static const intercept_handler_t instruction_handlers[256] = {
8c3f61e2 29 [0x01] = kvm_s390_handle_01,
48a3e950 30 [0x82] = kvm_s390_handle_lpsw,
e28acfea 31 [0x83] = kvm_s390_handle_diag,
5288fbf0 32 [0xae] = kvm_s390_handle_sigp,
70455a36 33 [0xb2] = kvm_s390_handle_b2,
aba07508 34 [0xb6] = kvm_s390_handle_stctl,
953ed88d 35 [0xb7] = kvm_s390_handle_lctl,
48a3e950 36 [0xb9] = kvm_s390_handle_b9,
bb25b9ba 37 [0xe5] = kvm_s390_handle_e5,
953ed88d 38 [0xeb] = kvm_s390_handle_eb,
ba5c1e9b 39};
8f2abe6a
CB		 40
41static int handle_noop(struct kvm_vcpu *vcpu)
42{
43 switch (vcpu->arch.sie_block->icptcode) {
0eaeafa1
CB		 44 case 0x0:
45 vcpu->stat.exit_null++;
46 break;
8f2abe6a
CB		 47 case 0x10:
48 vcpu->stat.exit_external_request++;
49 break;
8f2abe6a
CB		 50 default:
51 break; /* nothing */
52 }
53 return 0;
54}
55
56static int handle_stop(struct kvm_vcpu *vcpu)
57{
9ace903d 58 int rc = 0;
32f5ff63 59 unsigned int action_bits;
5288fbf0 60
8f2abe6a 61 vcpu->stat.exit_stop_request++;
ade38c31
CH		 62 trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
63
32f5ff63
DH		 64 action_bits = vcpu->arch.local_int.action_bits;
65
66 if (!(action_bits & ACTION_STOP_ON_STOP))
67 return 0;
9ace903d 68
32f5ff63 69 if (action_bits & ACTION_STORE_ON_STOP) {
9e0d5473
JF		 70 rc = kvm_s390_vcpu_store_status(vcpu,
71 KVM_S390_STORE_STATUS_NOADDR);
32f5ff63
DH		 72 if (rc)
73 return rc;
74 }
75
6352e4d2
DH		 76 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
77 kvm_s390_vcpu_stop(vcpu);
32f5ff63 78 return -EOPNOTSUPP;
8f2abe6a
CB		 79}
80
81static int handle_validity(struct kvm_vcpu *vcpu)
82{
83 int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9 84
8f2abe6a 85 vcpu->stat.exit_validity++;
5786fffa 86 trace_kvm_s390_intercept_validity(vcpu, viwhy);
2c70fe44
CB		 87 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
88 return -EOPNOTSUPP;
8f2abe6a
CB		 89}
90
ba5c1e9b
CO		 91static int handle_instruction(struct kvm_vcpu *vcpu)
92{
93 intercept_handler_t handler;
94
95 vcpu->stat.exit_instruction++;
5786fffa
CH		 96 trace_kvm_s390_intercept_instruction(vcpu,
97 vcpu->arch.sie_block->ipa,
98 vcpu->arch.sie_block->ipb);
ba5c1e9b
CO		 99 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
100 if (handler)
101 return handler(vcpu);
b8e660b8 102 return -EOPNOTSUPP;
ba5c1e9b
CO		 103}
104
439716a5
DH		 105static void __extract_prog_irq(struct kvm_vcpu *vcpu,
106 struct kvm_s390_pgm_info *pgm_info)
107{
108 memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
109 pgm_info->code = vcpu->arch.sie_block->iprcc;
110
111 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
112 case PGM_AFX_TRANSLATION:
113 case PGM_ASX_TRANSLATION:
114 case PGM_EX_TRANSLATION:
115 case PGM_LFX_TRANSLATION:
116 case PGM_LSTE_SEQUENCE:
117 case PGM_LSX_TRANSLATION:
118 case PGM_LX_TRANSLATION:
119 case PGM_PRIMARY_AUTHORITY:
120 case PGM_SECONDARY_AUTHORITY:
121 case PGM_SPACE_SWITCH:
122 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
123 break;
124 case PGM_ALEN_TRANSLATION:
125 case PGM_ALE_SEQUENCE:
126 case PGM_ASTE_INSTANCE:
127 case PGM_ASTE_SEQUENCE:
128 case PGM_ASTE_VALIDITY:
129 case PGM_EXTENDED_AUTHORITY:
130 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
131 break;
132 case PGM_ASCE_TYPE:
133 case PGM_PAGE_TRANSLATION:
134 case PGM_REGION_FIRST_TRANS:
135 case PGM_REGION_SECOND_TRANS:
136 case PGM_REGION_THIRD_TRANS:
137 case PGM_SEGMENT_TRANSLATION:
138 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
139 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
140 pgm_info->op_access_id = vcpu->arch.sie_block->oai;
141 break;
142 case PGM_MONITOR:
143 pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
144 pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
145 break;
146 case PGM_DATA:
147 pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
148 break;
149 case PGM_PROTECTION:
150 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
151 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
152 break;
153 default:
154 break;
155 }
156
157 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
158 pgm_info->per_code = vcpu->arch.sie_block->perc;
159 pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
160 pgm_info->per_address = vcpu->arch.sie_block->peraddr;
161 pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
162 }
163}
164
e325fe69
MM		 165/*
166 * restore ITDB to program-interruption TDB in guest lowcore
167 * and set TX abort indication if required
168*/
169static int handle_itdb(struct kvm_vcpu *vcpu)
170{
171 struct kvm_s390_itdb *itdb;
172 int rc;
173
174 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
175 return 0;
176 if (current->thread.per_flags & PER_FLAG_NO_TE)
177 return 0;
178 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
179 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
180 if (rc)
181 return rc;
182 memset(itdb, 0, sizeof(*itdb));
183
184 return 0;
185}
186
27291e21
DH		 187#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
188
ba5c1e9b
CO		 189static int handle_prog(struct kvm_vcpu *vcpu)
190{
439716a5 191 struct kvm_s390_pgm_info pgm_info;
684135e0 192 psw_t psw;
0040e7d2
HC		 193 int rc;
194
ba5c1e9b 195 vcpu->stat.exit_program_interruption++;
7feb6bb8 196
27291e21
DH		 197 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
198 kvm_s390_handle_per_event(vcpu);
199 /* the interrupt might have been filtered out completely */
200 if (vcpu->arch.sie_block->iprcc == 0)
201 return 0;
202 }
203
e325fe69 204 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0
TH		 205 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
206 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
207 if (rc)
208 return rc;
209 /* Avoid endless loops of specification exceptions */
210 if (!is_valid_psw(&psw))
211 return -EOPNOTSUPP;
212 }
e325fe69 213 rc = handle_itdb(vcpu);
0040e7d2
HC		 214 if (rc)
215 return rc;
439716a5 216
e325fe69 217 __extract_prog_irq(vcpu, &pgm_info);
439716a5 218 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
ba5c1e9b
CO		 219}
220
221static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
222{
223 int rc, rc2;
224
225 vcpu->stat.exit_instr_and_program++;
226 rc = handle_instruction(vcpu);
227 rc2 = handle_prog(vcpu);
228
b8e660b8 229 if (rc == -EOPNOTSUPP)
ba5c1e9b
CO		 230 vcpu->arch.sie_block->icptcode = 0x04;
231 if (rc)
232 return rc;
233 return rc2;
234}
235
f14d82e0
TH		 236/**
237 * handle_external_interrupt - used for external interruption interceptions
238 *
239 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
240 * the new PSW does not have external interrupts disabled. In the first case,
241 * we've got to deliver the interrupt manually, and in the second case, we
242 * drop to userspace to handle the situation there.
243 */
244static int handle_external_interrupt(struct kvm_vcpu *vcpu)
245{
246 u16 eic = vcpu->arch.sie_block->eic;
247 struct kvm_s390_interrupt irq;
248 psw_t newpsw;
249 int rc;
250
251 vcpu->stat.exit_external_interrupt++;
252
253 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
254 if (rc)
255 return rc;
256 /* We can not handle clock comparator or timer interrupt with bad PSW */
257 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
258 (newpsw.mask & PSW_MASK_EXT))
259 return -EOPNOTSUPP;
260
261 switch (eic) {
262 case EXT_IRQ_CLK_COMP:
263 irq.type = KVM_S390_INT_CLOCK_COMP;
264 break;
265 case EXT_IRQ_CPU_TIMER:
266 irq.type = KVM_S390_INT_CPU_TIMER;
267 break;
268 case EXT_IRQ_EXTERNAL_CALL:
4953919f
DH		 269 if (kvm_s390_si_ext_call_pending(vcpu))
270 return 0;
f14d82e0
TH		 271 irq.type = KVM_S390_INT_EXTERNAL_CALL;
272 irq.parm = vcpu->arch.sie_block->extcpuaddr;
273 break;
274 default:
275 return -EOPNOTSUPP;
276 }
277
278 return kvm_s390_inject_vcpu(vcpu, &irq);
279}
280
9a558ee3
TH		 281/**
282 * Handle MOVE PAGE partial execution interception.
283 *
284 * This interception can only happen for guests with DAT disabled and
285 * addresses that are currently not mapped in the host. Thus we try to
286 * set up the mappings for the corresponding user pages here (or throw
287 * addressing exceptions in case of illegal guest addresses).
288 */
289static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
290{
9a558ee3 291 psw_t *psw = &vcpu->arch.sie_block->gpsw;
f22166dc 292 unsigned long srcaddr, dstaddr;
9a558ee3
TH		 293 int reg1, reg2, rc;
294
295 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3
TH		 296
297 /* Make sure that the source is paged-in */
f22166dc
TH		 298 srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
299 if (kvm_is_error_gpa(vcpu->kvm, srcaddr))
9a558ee3 300 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
f22166dc
TH		 301 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
302 if (rc != 0)
9a558ee3
TH		 303 return rc;
304
305 /* Make sure that the destination is paged-in */
f22166dc
TH		 306 dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
307 if (kvm_is_error_gpa(vcpu->kvm, dstaddr))
9a558ee3 308 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
f22166dc
TH		 309 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
310 if (rc != 0)
9a558ee3
TH		 311 return rc;
312
313 psw->addr = __rewind_psw(*psw, 4);
314
315 return 0;
316}
317
318static int handle_partial_execution(struct kvm_vcpu *vcpu)
319{
320 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
321 return handle_mvpg_pei(vcpu);
4953919f
DH		 322 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
323 return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3
TH		 324
325 return -EOPNOTSUPP;
326}
327
062d5e9b 328static const intercept_handler_t intercept_funcs[] = {
8f2abe6a 329 [0x00 >> 2] = handle_noop,
ba5c1e9b
CO		 330 [0x04 >> 2] = handle_instruction,
331 [0x08 >> 2] = handle_prog,
332 [0x0C >> 2] = handle_instruction_and_prog,
8f2abe6a 333 [0x10 >> 2] = handle_noop,
f14d82e0 334 [0x14 >> 2] = handle_external_interrupt,
fa6b7fe9 335 [0x18 >> 2] = handle_noop,
ba5c1e9b 336 [0x1C >> 2] = kvm_s390_handle_wait,
8f2abe6a
CB		 337 [0x20 >> 2] = handle_validity,
338 [0x28 >> 2] = handle_stop,
9a558ee3 339 [0x38 >> 2] = handle_partial_execution,
8f2abe6a
CB		 340};
341
342int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
343{
344 intercept_handler_t func;
345 u8 code = vcpu->arch.sie_block->icptcode;
346
062d5e9b 347 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
b8e660b8 348 return -EOPNOTSUPP;
8f2abe6a
CB		 349 func = intercept_funcs[code >> 2];
350 if (func)
351 return func(vcpu);
b8e660b8 352 return -EOPNOTSUPP;
8f2abe6a 353}
Linux kernel - Deliverables
This page took 0.369721 seconds and 5 git commands to generate.