1 // SPDX-License-Identifier: GPL-2.0
3 * in-kernel handling for sie intercepts
5 * Copyright IBM Corp. 2008, 2014
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
11 #include <linux/kvm_host.h>
12 #include <linux/errno.h>
13 #include <linux/pagemap.h>
15 #include <asm/kvm_host.h>
16 #include <asm/asm-offsets.h>
18 #include <asm/sysinfo.h>
23 #include "trace-s390.h"
25 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
27 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
30 switch (vcpu->arch.sie_block->icptcode) {
36 /* instruction only stored for these icptcodes */
37 ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
38 /* Use the length of the EXECUTE instruction if necessary */
39 if (sie_block->icptstatus & 1) {
40 ilen = (sie_block->icptstatus >> 4) & 0x6;
46 /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
47 ilen = vcpu->arch.sie_block->pgmilc & 0x6;
53 static int handle_stop(struct kvm_vcpu *vcpu)
55 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
57 uint8_t flags, stop_pending;
59 vcpu->stat.exit_stop_request++;
61 /* delay the stop if any non-stop irq is pending */
62 if (kvm_s390_vcpu_has_irq(vcpu, 1))
65 /* avoid races with the injection/SIGP STOP code */
67 flags = li->irq.stop.flags;
68 stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
69 spin_unlock(&li->lock);
71 trace_kvm_s390_stop_request(stop_pending, flags);
75 if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
76 rc = kvm_s390_vcpu_store_status(vcpu,
77 KVM_S390_STORE_STATUS_NOADDR);
82 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
83 kvm_s390_vcpu_stop(vcpu);
87 static int handle_validity(struct kvm_vcpu *vcpu)
89 int viwhy = vcpu->arch.sie_block->ipb >> 16;
91 vcpu->stat.exit_validity++;
92 trace_kvm_s390_intercept_validity(vcpu, viwhy);
93 KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
94 current->pid, vcpu->kvm);
96 /* do not warn on invalid runtime instrumentation mode */
97 WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
102 static int handle_instruction(struct kvm_vcpu *vcpu)
104 vcpu->stat.exit_instruction++;
105 trace_kvm_s390_intercept_instruction(vcpu,
106 vcpu->arch.sie_block->ipa,
107 vcpu->arch.sie_block->ipb);
109 switch (vcpu->arch.sie_block->ipa >> 8) {
111 return kvm_s390_handle_01(vcpu);
113 return kvm_s390_handle_lpsw(vcpu);
115 return kvm_s390_handle_diag(vcpu);
117 return kvm_s390_handle_aa(vcpu);
119 return kvm_s390_handle_sigp(vcpu);
121 return kvm_s390_handle_b2(vcpu);
123 return kvm_s390_handle_stctl(vcpu);
125 return kvm_s390_handle_lctl(vcpu);
127 return kvm_s390_handle_b9(vcpu);
129 return kvm_s390_handle_e3(vcpu);
131 return kvm_s390_handle_e5(vcpu);
133 return kvm_s390_handle_eb(vcpu);
139 static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
141 struct kvm_s390_pgm_info pgm_info = {
142 .code = vcpu->arch.sie_block->iprcc,
143 /* the PSW has already been rewound */
144 .flags = KVM_S390_PGM_FLAGS_NO_REWIND,
147 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
148 case PGM_AFX_TRANSLATION:
149 case PGM_ASX_TRANSLATION:
150 case PGM_EX_TRANSLATION:
151 case PGM_LFX_TRANSLATION:
152 case PGM_LSTE_SEQUENCE:
153 case PGM_LSX_TRANSLATION:
154 case PGM_LX_TRANSLATION:
155 case PGM_PRIMARY_AUTHORITY:
156 case PGM_SECONDARY_AUTHORITY:
157 case PGM_SPACE_SWITCH:
158 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
160 case PGM_ALEN_TRANSLATION:
161 case PGM_ALE_SEQUENCE:
162 case PGM_ASTE_INSTANCE:
163 case PGM_ASTE_SEQUENCE:
164 case PGM_ASTE_VALIDITY:
165 case PGM_EXTENDED_AUTHORITY:
166 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
169 case PGM_PAGE_TRANSLATION:
170 case PGM_REGION_FIRST_TRANS:
171 case PGM_REGION_SECOND_TRANS:
172 case PGM_REGION_THIRD_TRANS:
173 case PGM_SEGMENT_TRANSLATION:
174 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
175 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
176 pgm_info.op_access_id = vcpu->arch.sie_block->oai;
179 pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
180 pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
182 case PGM_VECTOR_PROCESSING:
184 pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
187 pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
188 pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
194 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
195 pgm_info.per_code = vcpu->arch.sie_block->perc;
196 pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
197 pgm_info.per_address = vcpu->arch.sie_block->peraddr;
198 pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
200 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
204 * restore ITDB to program-interruption TDB in guest lowcore
205 * and set TX abort indication if required
207 static int handle_itdb(struct kvm_vcpu *vcpu)
209 struct kvm_s390_itdb *itdb;
212 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
214 if (current->thread.per_flags & PER_FLAG_NO_TE)
216 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
217 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
220 memset(itdb, 0, sizeof(*itdb));
225 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
227 static int handle_prog(struct kvm_vcpu *vcpu)
232 vcpu->stat.exit_program_interruption++;
234 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
235 rc = kvm_s390_handle_per_event(vcpu);
238 /* the interrupt might have been filtered out completely */
239 if (vcpu->arch.sie_block->iprcc == 0)
243 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
244 if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
245 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
248 /* Avoid endless loops of specification exceptions */
249 if (!is_valid_psw(&psw))
252 rc = handle_itdb(vcpu);
256 return inject_prog_on_prog_intercept(vcpu);
260 * handle_external_interrupt - used for external interruption interceptions
262 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
263 * the new PSW does not have external interrupts disabled. In the first case,
264 * we've got to deliver the interrupt manually, and in the second case, we
265 * drop to userspace to handle the situation there.
267 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
269 u16 eic = vcpu->arch.sie_block->eic;
270 struct kvm_s390_irq irq;
274 vcpu->stat.exit_external_interrupt++;
276 rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
279 /* We can not handle clock comparator or timer interrupt with bad PSW */
280 if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
281 (newpsw.mask & PSW_MASK_EXT))
285 case EXT_IRQ_CLK_COMP:
286 irq.type = KVM_S390_INT_CLOCK_COMP;
288 case EXT_IRQ_CPU_TIMER:
289 irq.type = KVM_S390_INT_CPU_TIMER;
291 case EXT_IRQ_EXTERNAL_CALL:
292 irq.type = KVM_S390_INT_EXTERNAL_CALL;
293 irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
294 rc = kvm_s390_inject_vcpu(vcpu, &irq);
295 /* ignore if another external call is already pending */
303 return kvm_s390_inject_vcpu(vcpu, &irq);
307 * Handle MOVE PAGE partial execution interception.
309 * This interception can only happen for guests with DAT disabled and
310 * addresses that are currently not mapped in the host. Thus we try to
311 * set up the mappings for the corresponding user pages here (or throw
312 * addressing exceptions in case of illegal guest addresses).
314 static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
316 unsigned long srcaddr, dstaddr;
319 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
321 /* Make sure that the source is paged-in */
322 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
323 reg2, &srcaddr, GACC_FETCH);
325 return kvm_s390_inject_prog_cond(vcpu, rc);
326 rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
330 /* Make sure that the destination is paged-in */
331 rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
332 reg1, &dstaddr, GACC_STORE);
334 return kvm_s390_inject_prog_cond(vcpu, rc);
335 rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
339 kvm_s390_retry_instr(vcpu);
344 static int handle_partial_execution(struct kvm_vcpu *vcpu)
346 vcpu->stat.exit_pei++;
348 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
349 return handle_mvpg_pei(vcpu);
350 if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
351 return kvm_s390_handle_sigp_pei(vcpu);
357 * Handle the sthyi instruction that provides the guest with system
358 * information, like current CPU resources available at each level of
361 int handle_sthyi(struct kvm_vcpu *vcpu)
363 int reg1, reg2, cc = 0, r = 0;
364 u64 code, addr, rc = 0;
365 struct sthyi_sctns *sctns = NULL;
367 if (!test_kvm_facility(vcpu->kvm, 74))
368 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
370 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
371 code = vcpu->run->s.regs.gprs[reg1];
372 addr = vcpu->run->s.regs.gprs[reg2];
374 vcpu->stat.instruction_sthyi++;
375 VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
376 trace_kvm_s390_handle_sthyi(vcpu, code, addr);
378 if (reg1 == reg2 || reg1 & 1 || reg2 & 1)
379 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
387 if (addr & ~PAGE_MASK)
388 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
390 sctns = (void *)get_zeroed_page(GFP_KERNEL);
394 cc = sthyi_fill(sctns, &rc);
396 free_page((unsigned long)sctns);
401 r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
403 free_page((unsigned long)sctns);
404 return kvm_s390_inject_prog_cond(vcpu, r);
408 free_page((unsigned long)sctns);
409 vcpu->run->s.regs.gprs[reg2 + 1] = rc;
410 kvm_s390_set_psw_cc(vcpu, cc);
414 static int handle_operexc(struct kvm_vcpu *vcpu)
416 psw_t oldpsw, newpsw;
419 vcpu->stat.exit_operation_exception++;
420 trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
421 vcpu->arch.sie_block->ipb);
423 if (vcpu->arch.sie_block->ipa == 0xb256)
424 return handle_sthyi(vcpu);
426 if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
428 rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
432 * Avoid endless loops of operation exceptions, if the pgm new
433 * PSW will cause a new operation exception.
434 * The heuristic checks if the pgm new psw is within 6 bytes before
435 * the faulting psw address (with same DAT, AS settings) and the
436 * new psw is not a wait psw and the fault was not triggered by
439 oldpsw = vcpu->arch.sie_block->gpsw;
440 if (oldpsw.addr - newpsw.addr <= 6 &&
441 !(newpsw.mask & PSW_MASK_WAIT) &&
442 !(oldpsw.mask & PSW_MASK_PSTATE) &&
443 (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
444 (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
447 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
450 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
454 if (kvm_is_ucontrol(vcpu->kvm))
457 switch (vcpu->arch.sie_block->icptcode) {
459 vcpu->stat.exit_external_request++;
462 vcpu->stat.exit_io_request++;
465 rc = handle_instruction(vcpu);
468 return handle_prog(vcpu);
470 return handle_external_interrupt(vcpu);
472 return kvm_s390_handle_wait(vcpu);
474 return handle_validity(vcpu);
476 return handle_stop(vcpu);
478 rc = handle_operexc(vcpu);
481 rc = handle_partial_execution(vcpu);
484 rc = kvm_s390_skey_check_enable(vcpu);
490 /* process PER, also if the instrution is processed in user space */
491 if (vcpu->arch.sie_block->icptstatus & 0x02 &&
492 (!rc || rc == -EOPNOTSUPP))
493 per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
494 return per_rc ? per_rc : rc;