nmi.c (89aa02edaa30e4327ebc8fca9b80795bbfd4ce9b) nmi.c (208da1d5fc3c67d8ae5d34e844fd67cc47a136f0)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Machine check handler
4 *
5 * Copyright IBM Corp. 2000, 2009
6 * Author(s): Ingo Adlung <adlung@de.ibm.com>,
7 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
8 * Cornelia Huck <cornelia.huck@de.ibm.com>,

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120 union ctlreg0 cr0, cr0_new;
121 char message[100];
122 psw_t psw_save;
123 char *ptr;
124
125 smp_emergency_stop();
126 diag_amode31_ops.diag308_reset();
127 ptr = nmi_puts(message, "System stopped due to unrecoverable machine check, code: 0x");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Machine check handler
4 *
5 * Copyright IBM Corp. 2000, 2009
6 * Author(s): Ingo Adlung <adlung@de.ibm.com>,
7 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
8 * Cornelia Huck <cornelia.huck@de.ibm.com>,

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120 union ctlreg0 cr0, cr0_new;
121 char message[100];
122 psw_t psw_save;
123 char *ptr;
124
125 smp_emergency_stop();
126 diag_amode31_ops.diag308_reset();
127 ptr = nmi_puts(message, "System stopped due to unrecoverable machine check, code: 0x");
128 u64_to_hex(ptr, S390_lowcore.mcck_interruption_code);
128 u64_to_hex(ptr, get_lowcore()->mcck_interruption_code);
129
130 /*
131 * Disable low address protection and make machine check new PSW a
132 * disabled wait PSW. Any additional machine check cannot be handled.
133 */
134 local_ctl_store(0, &cr0.reg);
135 cr0_new = cr0;
136 cr0_new.lap = 0;
137 local_ctl_load(0, &cr0_new.reg);
129
130 /*
131 * Disable low address protection and make machine check new PSW a
132 * disabled wait PSW. Any additional machine check cannot be handled.
133 */
134 local_ctl_store(0, &cr0.reg);
135 cr0_new = cr0;
136 cr0_new.lap = 0;
137 local_ctl_load(0, &cr0_new.reg);
138 psw_save = S390_lowcore.mcck_new_psw;
139 psw_bits(S390_lowcore.mcck_new_psw).io = 0;
140 psw_bits(S390_lowcore.mcck_new_psw).ext = 0;
141 psw_bits(S390_lowcore.mcck_new_psw).wait = 1;
138 psw_save = get_lowcore()->mcck_new_psw;
139 psw_bits(get_lowcore()->mcck_new_psw).io = 0;
140 psw_bits(get_lowcore()->mcck_new_psw).ext = 0;
141 psw_bits(get_lowcore()->mcck_new_psw).wait = 1;
142 sclp_emergency_printk(message);
143
144 /*
145 * Restore machine check new PSW and control register 0 to original
146 * values. This makes possible system dump analysis easier.
147 */
142 sclp_emergency_printk(message);
143
144 /*
145 * Restore machine check new PSW and control register 0 to original
146 * values. This makes possible system dump analysis easier.
147 */
148 S390_lowcore.mcck_new_psw = psw_save;
148 get_lowcore()->mcck_new_psw = psw_save;
149 local_ctl_load(0, &cr0.reg);
150 disabled_wait();
151 while (1);
152}
153NOKPROBE_SYMBOL(s390_handle_damage);
154
155/*
156 * Main machine check handler function. Will be called with interrupts disabled

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221 * field of the TOD clock. Disregard the TOD programmable register
222 * validity bit and load the CPU number into the TOD programmable field
223 * unconditionally.
224 */
225 set_tod_programmable_field(raw_smp_processor_id());
226 /*
227 * Set the clock comparator register to the next expected value.
228 */
149 local_ctl_load(0, &cr0.reg);
150 disabled_wait();
151 while (1);
152}
153NOKPROBE_SYMBOL(s390_handle_damage);
154
155/*
156 * Main machine check handler function. Will be called with interrupts disabled

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221 * field of the TOD clock. Disregard the TOD programmable register
222 * validity bit and load the CPU number into the TOD programmable field
223 * unconditionally.
224 */
225 set_tod_programmable_field(raw_smp_processor_id());
226 /*
227 * Set the clock comparator register to the next expected value.
228 */
229 set_clock_comparator(S390_lowcore.clock_comparator);
229 set_clock_comparator(get_lowcore()->clock_comparator);
230 if (!mci.gr || !mci.fp || !mci.fc)
231 return false;
232 /*
233 * The vector validity must only be checked if not running a
234 * KVM guest. For KVM guests the machine check is forwarded by
235 * KVM and it is the responsibility of the guest to take
236 * appropriate actions. The host vector or FPU values have been
237 * saved by KVM and will be restored by KVM.

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247 * For kernel or userspace the userspace values of guarded storage
248 * control can not be recreated, the process must be terminated.
249 * For SIE the guest values of guarded storage can not be recreated.
250 * This is either due to a bug or due to GS being disabled in the
251 * guest. The guest will be notified by KVM code and the guests machine
252 * check handling must take care of this. The host values are saved by
253 * KVM and are not affected.
254 */
230 if (!mci.gr || !mci.fp || !mci.fc)
231 return false;
232 /*
233 * The vector validity must only be checked if not running a
234 * KVM guest. For KVM guests the machine check is forwarded by
235 * KVM and it is the responsibility of the guest to take
236 * appropriate actions. The host vector or FPU values have been
237 * saved by KVM and will be restored by KVM.

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247 * For kernel or userspace the userspace values of guarded storage
248 * control can not be recreated, the process must be terminated.
249 * For SIE the guest values of guarded storage can not be recreated.
250 * This is either due to a bug or due to GS being disabled in the
251 * guest. The guest will be notified by KVM code and the guests machine
252 * check handling must take care of this. The host values are saved by
253 * KVM and are not affected.
254 */
255 cr2.reg = S390_lowcore.cregs_save_area[2];
255 cr2.reg = get_lowcore()->cregs_save_area[2];
256 if (cr2.gse && !mci.gs && !test_cpu_flag(CIF_MCCK_GUEST))
257 return false;
258 if (!mci.ms || !mci.pm || !mci.ia)
259 return false;
260 return true;
261}
262NOKPROBE_SYMBOL(nmi_registers_valid);
263

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273 struct kvm_s390_sie_block *sie_block = phys_to_virt(regs->gprs[14]);
274
275 if (sie_block == NULL)
276 /* Something's seriously wrong, stop system. */
277 s390_handle_damage();
278
279 sie_page = container_of(sie_block, struct sie_page, sie_block);
280 mcck_backup = &sie_page->mcck_info;
256 if (cr2.gse && !mci.gs && !test_cpu_flag(CIF_MCCK_GUEST))
257 return false;
258 if (!mci.ms || !mci.pm || !mci.ia)
259 return false;
260 return true;
261}
262NOKPROBE_SYMBOL(nmi_registers_valid);
263

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273 struct kvm_s390_sie_block *sie_block = phys_to_virt(regs->gprs[14]);
274
275 if (sie_block == NULL)
276 /* Something's seriously wrong, stop system. */
277 s390_handle_damage();
278
279 sie_page = container_of(sie_block, struct sie_page, sie_block);
280 mcck_backup = &sie_page->mcck_info;
281 mcck_backup->mcic = S390_lowcore.mcck_interruption_code &
281 mcck_backup->mcic = get_lowcore()->mcck_interruption_code &
282 ~(MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE);
282 ~(MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE);
283 mcck_backup->ext_damage_code = S390_lowcore.external_damage_code;
284 mcck_backup->failing_storage_address
285 = S390_lowcore.failing_storage_address;
283 mcck_backup->ext_damage_code = get_lowcore()->external_damage_code;
284 mcck_backup->failing_storage_address = get_lowcore()->failing_storage_address;
286}
287NOKPROBE_SYMBOL(s390_backup_mcck_info);
288
289#define MAX_IPD_COUNT 29
290#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
291
292#define ED_STP_ISLAND 6 /* External damage STP island check */
293#define ED_STP_SYNC 7 /* External damage STP sync check */

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309 unsigned long mcck_dam_code;
310 int mcck_pending = 0;
311
312 irq_state = irqentry_nmi_enter(regs);
313
314 if (user_mode(regs))
315 update_timer_mcck();
316 inc_irq_stat(NMI_NMI);
285}
286NOKPROBE_SYMBOL(s390_backup_mcck_info);
287
288#define MAX_IPD_COUNT 29
289#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
290
291#define ED_STP_ISLAND 6 /* External damage STP island check */
292#define ED_STP_SYNC 7 /* External damage STP sync check */

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308 unsigned long mcck_dam_code;
309 int mcck_pending = 0;
310
311 irq_state = irqentry_nmi_enter(regs);
312
313 if (user_mode(regs))
314 update_timer_mcck();
315 inc_irq_stat(NMI_NMI);
317 mci.val = S390_lowcore.mcck_interruption_code;
316 mci.val = get_lowcore()->mcck_interruption_code;
318 mcck = this_cpu_ptr(&cpu_mcck);
319
320 /*
321 * Reinject the instruction processing damages' machine checks
322 * including Delayed Access Exception into the guest
323 * instead of damaging the host if they happen in the guest.
324 */
325 if (mci.pd && !test_cpu_flag(CIF_MCCK_GUEST)) {

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377 s390_backup_mcck_info(regs);
378
379 if (mci.cd) {
380 /* Timing facility damage */
381 s390_handle_damage();
382 }
383 if (mci.ed && mci.ec) {
384 /* External damage */
317 mcck = this_cpu_ptr(&cpu_mcck);
318
319 /*
320 * Reinject the instruction processing damages' machine checks
321 * including Delayed Access Exception into the guest
322 * instead of damaging the host if they happen in the guest.
323 */
324 if (mci.pd && !test_cpu_flag(CIF_MCCK_GUEST)) {

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376 s390_backup_mcck_info(regs);
377
378 if (mci.cd) {
379 /* Timing facility damage */
380 s390_handle_damage();
381 }
382 if (mci.ed && mci.ec) {
383 /* External damage */
385 if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
384 if (get_lowcore()->external_damage_code & (1U << ED_STP_SYNC))
386 mcck->stp_queue |= stp_sync_check();
385 mcck->stp_queue |= stp_sync_check();
387 if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
386 if (get_lowcore()->external_damage_code & (1U << ED_STP_ISLAND))
388 mcck->stp_queue |= stp_island_check();
389 mcck_pending = 1;
390 }
391 /*
392 * Reinject storage related machine checks into the guest if they
393 * happen when the guest is running.
394 */
395 if (!test_cpu_flag(CIF_MCCK_GUEST)) {

--- 49 unchanged lines hidden --- 		387 mcck->stp_queue |= stp_island_check();
388 mcck_pending = 1;
389 }
390 /*
391 * Reinject storage related machine checks into the guest if they
392 * happen when the guest is running.
393 */
394 if (!test_cpu_flag(CIF_MCCK_GUEST)) {

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