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];