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 void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilc)
43 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
45 /* Use the length of the EXECUTE instruction if necessary */
46 if (sie_block->icptstatus & 1) {
47 ilc = (sie_block->icptstatus >> 4) & 0x6;
51 sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilc);
54 static int handle_noop(struct kvm_vcpu *vcpu)
56 switch (vcpu->arch.sie_block->icptcode) {
58 vcpu->stat.exit_null++;
61 vcpu->stat.exit_external_request++;
69 static int handle_stop(struct kvm_vcpu *vcpu)
72 unsigned int action_bits;
74 vcpu->stat.exit_stop_request++;
75 trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
77 action_bits = vcpu->arch.local_int.action_bits;
79 if (!(action_bits & ACTION_STOP_ON_STOP))
82 if (action_bits & ACTION_STORE_ON_STOP) {
83 rc = kvm_s390_vcpu_store_status(vcpu,
84 KVM_S390_STORE_STATUS_NOADDR);
89 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
90 kvm_s390_vcpu_stop(vcpu);
94 static int handle_validity(struct kvm_vcpu *vcpu)
96 int viwhy = vcpu->arch.sie_block->ipb >> 16;
98 vcpu->stat.exit_validity++;
99 trace_kvm_s390_intercept_validity(vcpu, viwhy);
100 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
104 static int handle_instruction(struct kvm_vcpu *vcpu)
106 intercept_handler_t handler;
108 vcpu->stat.exit_instruction++;
109 trace_kvm_s390_intercept_instruction(vcpu,
110 vcpu->arch.sie_block->ipa,
111 vcpu->arch.sie_block->ipb);
112 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
114 return handler(vcpu);
118 static void __extract_prog_irq(struct kvm_vcpu *vcpu,
119 struct kvm_s390_pgm_info *pgm_info)
121 memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
122 pgm_info->code = vcpu->arch.sie_block->iprcc;
124 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
125 case PGM_AFX_TRANSLATION:
126 case PGM_ASX_TRANSLATION:
127 case PGM_EX_TRANSLATION:
128 case PGM_LFX_TRANSLATION:
129 case PGM_LSTE_SEQUENCE:
130 case PGM_LSX_TRANSLATION:
131 case PGM_LX_TRANSLATION:
132 case PGM_PRIMARY_AUTHORITY:
133 case PGM_SECONDARY_AUTHORITY:
134 case PGM_SPACE_SWITCH:
135 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
137 case PGM_ALEN_TRANSLATION:
138 case PGM_ALE_SEQUENCE:
139 case PGM_ASTE_INSTANCE:
140 case PGM_ASTE_SEQUENCE:
141 case PGM_ASTE_VALIDITY:
142 case PGM_EXTENDED_AUTHORITY:
143 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
146 case PGM_PAGE_TRANSLATION:
147 case PGM_REGION_FIRST_TRANS:
148 case PGM_REGION_SECOND_TRANS:
149 case PGM_REGION_THIRD_TRANS:
150 case PGM_SEGMENT_TRANSLATION:
151 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
152 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
153 pgm_info->op_access_id = vcpu->arch.sie_block->oai;
156 pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
157 pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
160 pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
163 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
164 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
170 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
171 pgm_info->per_code = vcpu->arch.sie_block->perc;
172 pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
173 pgm_info->per_address = vcpu->arch.sie_block->peraddr;
174 pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
179 * restore ITDB to program-interruption TDB in guest lowcore
180 * and set TX abort indication if required
182 static int handle_itdb(struct kvm_vcpu *vcpu)
184 struct kvm_s390_itdb *itdb;
187 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
189 if (current->thread.per_flags & PER_FLAG_NO_TE)
191 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
192 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
195 memset(itdb, 0, sizeof(*itdb));
200 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
202 static int handle_prog(struct kvm_vcpu *vcpu)
204 struct kvm_s390_pgm_info pgm_info;
208 vcpu->stat.exit_program_interruption++;
210 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
211 kvm_s390_handle_per_event(vcpu);
212 /* the interrupt might have been filtered out completely */
213 if (vcpu->arch.sie_block->iprcc == 0)
217 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
218 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
219 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
222 /* Avoid endless loops of specification exceptions */
223 if (!is_valid_psw(&psw))
226 rc = handle_itdb(vcpu);
230 __extract_prog_irq(vcpu, &pgm_info);
231 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
234 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
238 vcpu->stat.exit_instr_and_program++;
239 rc = handle_instruction(vcpu);
240 rc2 = handle_prog(vcpu);
242 if (rc == -EOPNOTSUPP)
243 vcpu->arch.sie_block->icptcode = 0x04;
250 * handle_external_interrupt - used for external interruption interceptions
252 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
253 * the new PSW does not have external interrupts disabled. In the first case,
254 * we've got to deliver the interrupt manually, and in the second case, we
255 * drop to userspace to handle the situation there.
257 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
259 u16 eic = vcpu->arch.sie_block->eic;
260 struct kvm_s390_irq irq;
264 vcpu->stat.exit_external_interrupt++;
266 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
269 /* We can not handle clock comparator or timer interrupt with bad PSW */
270 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
271 (newpsw.mask & PSW_MASK_EXT))
275 case EXT_IRQ_CLK_COMP:
276 irq.type = KVM_S390_INT_CLOCK_COMP;
278 case EXT_IRQ_CPU_TIMER:
279 irq.type = KVM_S390_INT_CPU_TIMER;
281 case EXT_IRQ_EXTERNAL_CALL:
282 if (kvm_s390_si_ext_call_pending(vcpu))
284 irq.type = KVM_S390_INT_EXTERNAL_CALL;
285 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
291 return kvm_s390_inject_vcpu(vcpu, &irq);
295 * Handle MOVE PAGE partial execution interception.
297 * This interception can only happen for guests with DAT disabled and
298 * addresses that are currently not mapped in the host. Thus we try to
299 * set up the mappings for the corresponding user pages here (or throw
300 * addressing exceptions in case of illegal guest addresses).
302 static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
304 unsigned long srcaddr, dstaddr;
307 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
309 /* Make sure that the source is paged-in */
310 srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
311 if (kvm_is_error_gpa(vcpu->kvm, srcaddr))
312 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
313 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
317 /* Make sure that the destination is paged-in */
318 dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
319 if (kvm_is_error_gpa(vcpu->kvm, dstaddr))
320 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
321 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
325 kvm_s390_rewind_psw(vcpu, 4);
330 static int handle_partial_execution(struct kvm_vcpu *vcpu)
332 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
333 return handle_mvpg_pei(vcpu);
334 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
335 return kvm_s390_handle_sigp_pei(vcpu);
340 static const intercept_handler_t intercept_funcs[] = {
341 [0x00 >> 2] = handle_noop,
342 [0x04 >> 2] = handle_instruction,
343 [0x08 >> 2] = handle_prog,
344 [0x0C >> 2] = handle_instruction_and_prog,
345 [0x10 >> 2] = handle_noop,
346 [0x14 >> 2] = handle_external_interrupt,
347 [0x18 >> 2] = handle_noop,
348 [0x1C >> 2] = kvm_s390_handle_wait,
349 [0x20 >> 2] = handle_validity,
350 [0x28 >> 2] = handle_stop,
351 [0x38 >> 2] = handle_partial_execution,
354 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
356 intercept_handler_t func;
357 u8 code = vcpu->arch.sie_block->icptcode;
359 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
361 func = intercept_funcs[code >> 2];