2 * in-kernel handling for sie intercepts
4 * Copyright IBM Corp. 2008, 2014
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.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
14 #include <linux/kvm_host.h>
15 #include <linux/errno.h>
16 #include <linux/pagemap.h>
18 #include <asm/kvm_host.h>
19 #include <asm/asm-offsets.h>
25 #include "trace-s390.h"
28 static 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
,
41 static int handle_noop(struct kvm_vcpu
*vcpu
)
43 switch (vcpu
->arch
.sie_block
->icptcode
) {
45 vcpu
->stat
.exit_null
++;
48 vcpu
->stat
.exit_external_request
++;
56 static int handle_stop(struct kvm_vcpu
*vcpu
)
59 unsigned int action_bits
;
61 vcpu
->stat
.exit_stop_request
++;
62 trace_kvm_s390_stop_request(vcpu
->arch
.local_int
.action_bits
);
64 action_bits
= vcpu
->arch
.local_int
.action_bits
;
66 if (!(action_bits
& ACTION_STOP_ON_STOP
))
69 if (action_bits
& ACTION_STORE_ON_STOP
) {
70 rc
= kvm_s390_vcpu_store_status(vcpu
,
71 KVM_S390_STORE_STATUS_NOADDR
);
76 if (!kvm_s390_user_cpu_state_ctrl(vcpu
->kvm
))
77 kvm_s390_vcpu_stop(vcpu
);
81 static int handle_validity(struct kvm_vcpu
*vcpu
)
83 int viwhy
= vcpu
->arch
.sie_block
->ipb
>> 16;
85 vcpu
->stat
.exit_validity
++;
86 trace_kvm_s390_intercept_validity(vcpu
, viwhy
);
87 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy
);
91 static int handle_instruction(struct kvm_vcpu
*vcpu
)
93 intercept_handler_t handler
;
95 vcpu
->stat
.exit_instruction
++;
96 trace_kvm_s390_intercept_instruction(vcpu
,
97 vcpu
->arch
.sie_block
->ipa
,
98 vcpu
->arch
.sie_block
->ipb
);
99 handler
= instruction_handlers
[vcpu
->arch
.sie_block
->ipa
>> 8];
101 return handler(vcpu
);
105 static void __extract_prog_irq(struct kvm_vcpu
*vcpu
,
106 struct kvm_s390_pgm_info
*pgm_info
)
108 memset(pgm_info
, 0, sizeof(struct kvm_s390_pgm_info
));
109 pgm_info
->code
= vcpu
->arch
.sie_block
->iprcc
;
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
;
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
;
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
;
143 pgm_info
->mon_class_nr
= vcpu
->arch
.sie_block
->mcn
;
144 pgm_info
->mon_code
= vcpu
->arch
.sie_block
->tecmc
;
147 pgm_info
->data_exc_code
= vcpu
->arch
.sie_block
->dxc
;
150 pgm_info
->trans_exc_code
= vcpu
->arch
.sie_block
->tecmc
;
151 pgm_info
->exc_access_id
= vcpu
->arch
.sie_block
->eai
;
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
;
166 * restore ITDB to program-interruption TDB in guest lowcore
167 * and set TX abort indication if required
169 static int handle_itdb(struct kvm_vcpu
*vcpu
)
171 struct kvm_s390_itdb
*itdb
;
174 if (!IS_TE_ENABLED(vcpu
) || !IS_ITDB_VALID(vcpu
))
176 if (current
->thread
.per_flags
& PER_FLAG_NO_TE
)
178 itdb
= (struct kvm_s390_itdb
*)vcpu
->arch
.sie_block
->itdba
;
179 rc
= write_guest_lc(vcpu
, __LC_PGM_TDB
, itdb
, sizeof(*itdb
));
182 memset(itdb
, 0, sizeof(*itdb
));
187 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
189 static int handle_prog(struct kvm_vcpu
*vcpu
)
191 struct kvm_s390_pgm_info pgm_info
;
195 vcpu
->stat
.exit_program_interruption
++;
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)
204 trace_kvm_s390_intercept_prog(vcpu
, vcpu
->arch
.sie_block
->iprcc
);
205 if (vcpu
->arch
.sie_block
->iprcc
== PGM_SPECIFICATION
) {
206 rc
= read_guest_lc(vcpu
, __LC_PGM_NEW_PSW
, &psw
, sizeof(psw_t
));
209 /* Avoid endless loops of specification exceptions */
210 if (!is_valid_psw(&psw
))
213 rc
= handle_itdb(vcpu
);
217 __extract_prog_irq(vcpu
, &pgm_info
);
218 return kvm_s390_inject_prog_irq(vcpu
, &pgm_info
);
221 static int handle_instruction_and_prog(struct kvm_vcpu
*vcpu
)
225 vcpu
->stat
.exit_instr_and_program
++;
226 rc
= handle_instruction(vcpu
);
227 rc2
= handle_prog(vcpu
);
229 if (rc
== -EOPNOTSUPP
)
230 vcpu
->arch
.sie_block
->icptcode
= 0x04;
237 * handle_external_interrupt - used for external interruption interceptions
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.
244 static int handle_external_interrupt(struct kvm_vcpu
*vcpu
)
246 u16 eic
= vcpu
->arch
.sie_block
->eic
;
247 struct kvm_s390_interrupt irq
;
251 vcpu
->stat
.exit_external_interrupt
++;
253 rc
= read_guest_lc(vcpu
, __LC_EXT_NEW_PSW
, &newpsw
, sizeof(psw_t
));
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
))
262 case EXT_IRQ_CLK_COMP
:
263 irq
.type
= KVM_S390_INT_CLOCK_COMP
;
265 case EXT_IRQ_CPU_TIMER
:
266 irq
.type
= KVM_S390_INT_CPU_TIMER
;
268 case EXT_IRQ_EXTERNAL_CALL
:
269 if (kvm_s390_si_ext_call_pending(vcpu
))
271 irq
.type
= KVM_S390_INT_EXTERNAL_CALL
;
272 irq
.parm
= vcpu
->arch
.sie_block
->extcpuaddr
;
278 return kvm_s390_inject_vcpu(vcpu
, &irq
);
282 * Handle MOVE PAGE partial execution interception.
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).
289 static int handle_mvpg_pei(struct kvm_vcpu
*vcpu
)
291 psw_t
*psw
= &vcpu
->arch
.sie_block
->gpsw
;
292 unsigned long srcaddr
, dstaddr
;
295 kvm_s390_get_regs_rre(vcpu
, ®1
, ®2
);
297 /* Make sure that the source is paged-in */
298 srcaddr
= kvm_s390_real_to_abs(vcpu
, vcpu
->run
->s
.regs
.gprs
[reg2
]);
299 if (kvm_is_error_gpa(vcpu
->kvm
, srcaddr
))
300 return kvm_s390_inject_program_int(vcpu
, PGM_ADDRESSING
);
301 rc
= kvm_arch_fault_in_page(vcpu
, srcaddr
, 0);
305 /* Make sure that the destination is paged-in */
306 dstaddr
= kvm_s390_real_to_abs(vcpu
, vcpu
->run
->s
.regs
.gprs
[reg1
]);
307 if (kvm_is_error_gpa(vcpu
->kvm
, dstaddr
))
308 return kvm_s390_inject_program_int(vcpu
, PGM_ADDRESSING
);
309 rc
= kvm_arch_fault_in_page(vcpu
, dstaddr
, 1);
313 psw
->addr
= __rewind_psw(*psw
, 4);
318 static int handle_partial_execution(struct kvm_vcpu
*vcpu
)
320 if (vcpu
->arch
.sie_block
->ipa
== 0xb254) /* MVPG */
321 return handle_mvpg_pei(vcpu
);
322 if (vcpu
->arch
.sie_block
->ipa
>> 8 == 0xae) /* SIGP */
323 return kvm_s390_handle_sigp_pei(vcpu
);
328 static const intercept_handler_t intercept_funcs
[] = {
329 [0x00 >> 2] = handle_noop
,
330 [0x04 >> 2] = handle_instruction
,
331 [0x08 >> 2] = handle_prog
,
332 [0x0C >> 2] = handle_instruction_and_prog
,
333 [0x10 >> 2] = handle_noop
,
334 [0x14 >> 2] = handle_external_interrupt
,
335 [0x18 >> 2] = handle_noop
,
336 [0x1C >> 2] = kvm_s390_handle_wait
,
337 [0x20 >> 2] = handle_validity
,
338 [0x28 >> 2] = handle_stop
,
339 [0x38 >> 2] = handle_partial_execution
,
342 int kvm_handle_sie_intercept(struct kvm_vcpu
*vcpu
)
344 intercept_handler_t func
;
345 u8 code
= vcpu
->arch
.sie_block
->icptcode
;
347 if (code
& 3 || (code
>> 2) >= ARRAY_SIZE(intercept_funcs
))
349 func
= intercept_funcs
[code
>> 2];