2 * in-kernel handling for sie intercepts
4 * Copyright IBM Corp. 2008, 2009
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>
24 #include "trace-s390.h"
27 static const intercept_handler_t instruction_handlers[256] = {
28 [0x01] = kvm_s390_handle_01,
29 [0x82] = kvm_s390_handle_lpsw,
30 [0x83] = kvm_s390_handle_diag,
31 [0xae] = kvm_s390_handle_sigp,
32 [0xb2] = kvm_s390_handle_b2,
33 [0xb6] = kvm_s390_handle_stctl,
34 [0xb7] = kvm_s390_handle_lctl,
35 [0xb9] = kvm_s390_handle_b9,
36 [0xe5] = kvm_s390_handle_e5,
37 [0xeb] = kvm_s390_handle_eb,
40 static int handle_noop(struct kvm_vcpu *vcpu)
42 switch (vcpu->arch.sie_block->icptcode) {
44 vcpu->stat.exit_null++;
47 vcpu->stat.exit_external_request++;
50 vcpu->stat.exit_external_interrupt++;
58 static int handle_stop(struct kvm_vcpu *vcpu)
62 vcpu->stat.exit_stop_request++;
63 spin_lock_bh(&vcpu->arch.local_int.lock);
65 trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
67 if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
68 atomic_set_mask(CPUSTAT_STOPPED,
69 &vcpu->arch.sie_block->cpuflags);
70 vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
71 VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
75 if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
76 vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
77 /* store status must be called unlocked. Since local_int.lock
78 * only protects local_int.* and not guest memory we can give
80 spin_unlock_bh(&vcpu->arch.local_int.lock);
81 rc = kvm_s390_vcpu_store_status(vcpu,
82 KVM_S390_STORE_STATUS_NOADDR);
86 spin_unlock_bh(&vcpu->arch.local_int.lock);
90 static int handle_validity(struct kvm_vcpu *vcpu)
92 int viwhy = vcpu->arch.sie_block->ipb >> 16;
94 vcpu->stat.exit_validity++;
95 trace_kvm_s390_intercept_validity(vcpu, viwhy);
96 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
100 static int handle_instruction(struct kvm_vcpu *vcpu)
102 intercept_handler_t handler;
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 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
110 return handler(vcpu);
114 static void __extract_prog_irq(struct kvm_vcpu *vcpu,
115 struct kvm_s390_pgm_info *pgm_info)
117 memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
118 pgm_info->code = vcpu->arch.sie_block->iprcc;
120 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
121 case PGM_AFX_TRANSLATION:
122 case PGM_ASX_TRANSLATION:
123 case PGM_EX_TRANSLATION:
124 case PGM_LFX_TRANSLATION:
125 case PGM_LSTE_SEQUENCE:
126 case PGM_LSX_TRANSLATION:
127 case PGM_LX_TRANSLATION:
128 case PGM_PRIMARY_AUTHORITY:
129 case PGM_SECONDARY_AUTHORITY:
130 case PGM_SPACE_SWITCH:
131 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
133 case PGM_ALEN_TRANSLATION:
134 case PGM_ALE_SEQUENCE:
135 case PGM_ASTE_INSTANCE:
136 case PGM_ASTE_SEQUENCE:
137 case PGM_ASTE_VALIDITY:
138 case PGM_EXTENDED_AUTHORITY:
139 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
142 case PGM_PAGE_TRANSLATION:
143 case PGM_REGION_FIRST_TRANS:
144 case PGM_REGION_SECOND_TRANS:
145 case PGM_REGION_THIRD_TRANS:
146 case PGM_SEGMENT_TRANSLATION:
147 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
148 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
149 pgm_info->op_access_id = vcpu->arch.sie_block->oai;
152 pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
153 pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
156 pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
159 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
160 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
166 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
167 pgm_info->per_code = vcpu->arch.sie_block->perc;
168 pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
169 pgm_info->per_address = vcpu->arch.sie_block->peraddr;
170 pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
175 * restore ITDB to program-interruption TDB in guest lowcore
176 * and set TX abort indication if required
178 static int handle_itdb(struct kvm_vcpu *vcpu)
180 struct kvm_s390_itdb *itdb;
183 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
185 if (current->thread.per_flags & PER_FLAG_NO_TE)
187 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
188 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
191 memset(itdb, 0, sizeof(*itdb));
196 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
198 static int handle_prog(struct kvm_vcpu *vcpu)
200 struct kvm_s390_pgm_info pgm_info;
203 vcpu->stat.exit_program_interruption++;
205 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
206 kvm_s390_handle_per_event(vcpu);
207 /* the interrupt might have been filtered out completely */
208 if (vcpu->arch.sie_block->iprcc == 0)
212 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
214 rc = handle_itdb(vcpu);
218 __extract_prog_irq(vcpu, &pgm_info);
219 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
222 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
226 vcpu->stat.exit_instr_and_program++;
227 rc = handle_instruction(vcpu);
228 rc2 = handle_prog(vcpu);
230 if (rc == -EOPNOTSUPP)
231 vcpu->arch.sie_block->icptcode = 0x04;
237 static const intercept_handler_t intercept_funcs[] = {
238 [0x00 >> 2] = handle_noop,
239 [0x04 >> 2] = handle_instruction,
240 [0x08 >> 2] = handle_prog,
241 [0x0C >> 2] = handle_instruction_and_prog,
242 [0x10 >> 2] = handle_noop,
243 [0x14 >> 2] = handle_noop,
244 [0x18 >> 2] = handle_noop,
245 [0x1C >> 2] = kvm_s390_handle_wait,
246 [0x20 >> 2] = handle_validity,
247 [0x28 >> 2] = handle_stop,
250 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
252 intercept_handler_t func;
253 u8 code = vcpu->arch.sie_block->icptcode;
255 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
257 func = intercept_funcs[code >> 2];