Greg Kroah-Hartman | a17ae4c | 2017-11-24 15:00:32 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 3 | * Machine check handler |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Heiko Carstens | a53c8fa | 2012-07-20 11:15:04 +0200 | [diff] [blame] | 5 | * Copyright IBM Corp. 2000, 2009 |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 6 | * Author(s): Ingo Adlung <adlung@de.ibm.com>, |
| 7 | * Martin Schwidefsky <schwidefsky@de.ibm.com>, |
| 8 | * Cornelia Huck <cornelia.huck@de.ibm.com>, |
| 9 | * Heiko Carstens <heiko.carstens@de.ibm.com>, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Heiko Carstens | 052ff46 | 2011-01-05 12:47:28 +0100 | [diff] [blame] | 12 | #include <linux/kernel_stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/errno.h> |
Heiko Carstens | 81f64b8 | 2009-04-14 15:36:18 +0200 | [diff] [blame] | 15 | #include <linux/hardirq.h> |
Martin Schwidefsky | 6c81511 | 2017-10-12 13:24:47 +0200 | [diff] [blame] | 16 | #include <linux/log2.h> |
Martin Schwidefsky | 00a8f88 | 2017-09-15 16:24:31 +0200 | [diff] [blame] | 17 | #include <linux/kprobes.h> |
Randy Dunlap | 514c603 | 2018-04-05 16:25:34 -0700 | [diff] [blame] | 18 | #include <linux/kmemleak.h> |
Heiko Carstens | 022e4fc | 2006-05-01 12:16:14 -0700 | [diff] [blame] | 19 | #include <linux/time.h> |
Ingo Molnar | 3f07c01 | 2017-02-08 18:51:30 +0100 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/sched/signal.h> |
| 22 | |
Paul Gortmaker | 3994a52 | 2017-02-09 15:20:23 -0500 | [diff] [blame] | 23 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/lowcore.h> |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 25 | #include <asm/smp.h> |
Martin Schwidefsky | fd5ada0 | 2016-05-31 15:06:51 +0200 | [diff] [blame] | 26 | #include <asm/stp.h> |
Martin Schwidefsky | 76d4e00 | 2009-06-12 10:26:21 +0200 | [diff] [blame] | 27 | #include <asm/cputime.h> |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 28 | #include <asm/nmi.h> |
| 29 | #include <asm/crw.h> |
Martin Schwidefsky | 8070361 | 2014-10-06 17:53:53 +0200 | [diff] [blame] | 30 | #include <asm/switch_to.h> |
Heiko Carstens | cad49cf | 2015-07-07 08:40:49 +0200 | [diff] [blame] | 31 | #include <asm/ctl_reg.h> |
QingFeng Hao | c929500 | 2017-06-07 11:30:42 +0200 | [diff] [blame] | 32 | #include <asm/asm-offsets.h> |
QingFeng Hao | da72ca4 | 2017-06-07 11:41:19 +0200 | [diff] [blame] | 33 | #include <linux/kvm_host.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 35 | struct mcck_struct { |
Heiko Carstens | 3632496 | 2015-10-12 13:04:12 +0200 | [diff] [blame] | 36 | unsigned int kill_task : 1; |
| 37 | unsigned int channel_report : 1; |
| 38 | unsigned int warning : 1; |
Heiko Carstens | 29b0a82 | 2015-10-09 13:48:03 +0200 | [diff] [blame] | 39 | unsigned int stp_queue : 1; |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 40 | unsigned long mcck_code; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck); |
Martin Schwidefsky | 6c81511 | 2017-10-12 13:24:47 +0200 | [diff] [blame] | 44 | static struct kmem_cache *mcesa_cache; |
| 45 | static unsigned long mcesa_origin_lc; |
| 46 | |
| 47 | static inline int nmi_needs_mcesa(void) |
| 48 | { |
| 49 | return MACHINE_HAS_VX || MACHINE_HAS_GS; |
| 50 | } |
| 51 | |
| 52 | static inline unsigned long nmi_get_mcesa_size(void) |
| 53 | { |
| 54 | if (MACHINE_HAS_GS) |
| 55 | return MCESA_MAX_SIZE; |
| 56 | return MCESA_MIN_SIZE; |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * The initial machine check extended save area for the boot CPU. |
| 61 | * It will be replaced by nmi_init() with an allocated structure. |
| 62 | * The structure is required for machine check happening early in |
| 63 | * the boot process. |
| 64 | */ |
| 65 | static struct mcesa boot_mcesa __initdata __aligned(MCESA_MAX_SIZE); |
| 66 | |
| 67 | void __init nmi_alloc_boot_cpu(struct lowcore *lc) |
| 68 | { |
| 69 | if (!nmi_needs_mcesa()) |
| 70 | return; |
| 71 | lc->mcesad = (unsigned long) &boot_mcesa; |
| 72 | if (MACHINE_HAS_GS) |
| 73 | lc->mcesad |= ilog2(MCESA_MAX_SIZE); |
| 74 | } |
| 75 | |
| 76 | static int __init nmi_init(void) |
| 77 | { |
| 78 | unsigned long origin, cr0, size; |
| 79 | |
| 80 | if (!nmi_needs_mcesa()) |
| 81 | return 0; |
| 82 | size = nmi_get_mcesa_size(); |
| 83 | if (size > MCESA_MIN_SIZE) |
| 84 | mcesa_origin_lc = ilog2(size); |
| 85 | /* create slab cache for the machine-check-extended-save-areas */ |
| 86 | mcesa_cache = kmem_cache_create("nmi_save_areas", size, size, 0, NULL); |
| 87 | if (!mcesa_cache) |
| 88 | panic("Couldn't create nmi save area cache"); |
| 89 | origin = (unsigned long) kmem_cache_alloc(mcesa_cache, GFP_KERNEL); |
| 90 | if (!origin) |
| 91 | panic("Couldn't allocate nmi save area"); |
| 92 | /* The pointer is stored with mcesa_bits ORed in */ |
| 93 | kmemleak_not_leak((void *) origin); |
| 94 | __ctl_store(cr0, 0, 0); |
| 95 | __ctl_clear_bit(0, 28); /* disable lowcore protection */ |
| 96 | /* Replace boot_mcesa on the boot CPU */ |
| 97 | S390_lowcore.mcesad = origin | mcesa_origin_lc; |
| 98 | __ctl_load(cr0, 0, 0); |
| 99 | return 0; |
| 100 | } |
| 101 | early_initcall(nmi_init); |
| 102 | |
| 103 | int nmi_alloc_per_cpu(struct lowcore *lc) |
| 104 | { |
| 105 | unsigned long origin; |
| 106 | |
| 107 | if (!nmi_needs_mcesa()) |
| 108 | return 0; |
| 109 | origin = (unsigned long) kmem_cache_alloc(mcesa_cache, GFP_KERNEL); |
| 110 | if (!origin) |
| 111 | return -ENOMEM; |
| 112 | /* The pointer is stored with mcesa_bits ORed in */ |
| 113 | kmemleak_not_leak((void *) origin); |
| 114 | lc->mcesad = origin | mcesa_origin_lc; |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | void nmi_free_per_cpu(struct lowcore *lc) |
| 119 | { |
| 120 | if (!nmi_needs_mcesa()) |
| 121 | return; |
| 122 | kmem_cache_free(mcesa_cache, (void *)(lc->mcesad & MCESA_ORIGIN_MASK)); |
| 123 | } |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 124 | |
Martin Schwidefsky | 00a8f88 | 2017-09-15 16:24:31 +0200 | [diff] [blame] | 125 | static notrace void s390_handle_damage(void) |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 126 | { |
Martin Schwidefsky | 00a8f88 | 2017-09-15 16:24:31 +0200 | [diff] [blame] | 127 | smp_emergency_stop(); |
Martin Schwidefsky | 98587c2 | 2019-04-30 12:33:45 +0200 | [diff] [blame] | 128 | disabled_wait(); |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 129 | while (1); |
| 130 | } |
Martin Schwidefsky | 00a8f88 | 2017-09-15 16:24:31 +0200 | [diff] [blame] | 131 | NOKPROBE_SYMBOL(s390_handle_damage); |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 134 | * Main machine check handler function. Will be called with interrupts enabled |
| 135 | * or disabled and machine checks enabled or disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | */ |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 137 | void s390_handle_mcck(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 139 | unsigned long flags; |
| 140 | struct mcck_struct mcck; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 142 | /* |
| 143 | * Disable machine checks and get the current state of accumulated |
| 144 | * machine checks. Afterwards delete the old state and enable machine |
| 145 | * checks again. |
| 146 | */ |
| 147 | local_irq_save(flags); |
| 148 | local_mcck_disable(); |
Sebastian Ott | 2cb4a18 | 2014-11-28 15:40:57 +0100 | [diff] [blame] | 149 | mcck = *this_cpu_ptr(&cpu_mcck); |
| 150 | memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck)); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 151 | local_mcck_enable(); |
| 152 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 154 | if (mcck.channel_report) |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 155 | crw_handle_channel_report(); |
Heiko Carstens | 7b88641 | 2009-03-26 15:24:02 +0100 | [diff] [blame] | 156 | /* |
| 157 | * A warning may remain for a prolonged period on the bare iron. |
| 158 | * (actually until the machine is powered off, or the problem is gone) |
| 159 | * So we just stop listening for the WARNING MCH and avoid continuously |
| 160 | * being interrupted. One caveat is however, that we must do this per |
| 161 | * processor and cannot use the smp version of ctl_clear_bit(). |
| 162 | * On VM we only get one interrupt per virtally presented machinecheck. |
| 163 | * Though one suffices, we may get one interrupt per (virtual) cpu. |
| 164 | */ |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 165 | if (mcck.warning) { /* WARNING pending ? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | static int mchchk_wng_posted = 0; |
Heiko Carstens | 7b88641 | 2009-03-26 15:24:02 +0100 | [diff] [blame] | 167 | |
| 168 | /* Use single cpu clear, as we cannot handle smp here. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | __ctl_clear_bit(14, 24); /* Disable WARNING MCH */ |
| 170 | if (xchg(&mchchk_wng_posted, 1) == 0) |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 171 | kill_cad_pid(SIGPWR, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
Heiko Carstens | 29b0a82 | 2015-10-09 13:48:03 +0200 | [diff] [blame] | 173 | if (mcck.stp_queue) |
| 174 | stp_queue_work(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 175 | if (mcck.kill_task) { |
| 176 | local_irq_enable(); |
| 177 | printk(KERN_EMERG "mcck: Terminating task because of machine " |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 178 | "malfunction (code 0x%016lx).\n", mcck.mcck_code); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 179 | printk(KERN_EMERG "mcck: task: %s, pid: %d.\n", |
| 180 | current->comm, current->pid); |
| 181 | do_exit(SIGSEGV); |
| 182 | } |
| 183 | } |
Christian Borntraeger | 71cde58 | 2008-05-21 13:37:34 +0200 | [diff] [blame] | 184 | EXPORT_SYMBOL_GPL(s390_handle_mcck); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 185 | |
| 186 | /* |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 187 | * returns 0 if all required registers are available |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 188 | * returns 1 otherwise |
| 189 | */ |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 190 | static int notrace s390_check_registers(union mci mci, int umode) |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 191 | { |
Martin Schwidefsky | ad3bc0a | 2017-10-12 13:24:45 +0200 | [diff] [blame] | 192 | union ctlreg2 cr2; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 193 | int kill_task; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 194 | |
| 195 | kill_task = 0; |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 196 | |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 197 | if (!mci.gr) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 198 | /* |
| 199 | * General purpose registers couldn't be restored and have |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 200 | * unknown contents. Stop system or terminate process. |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 201 | */ |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 202 | if (!umode) |
| 203 | s390_handle_damage(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 204 | kill_task = 1; |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 205 | } |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 206 | /* Check control registers */ |
Heiko Carstens | 70e28aa | 2017-02-21 10:51:55 +0100 | [diff] [blame] | 207 | if (!mci.cr) { |
| 208 | /* |
| 209 | * Control registers have unknown contents. |
| 210 | * Can't recover and therefore stopping machine. |
| 211 | */ |
| 212 | s390_handle_damage(); |
Heiko Carstens | 70e28aa | 2017-02-21 10:51:55 +0100 | [diff] [blame] | 213 | } |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 214 | if (!mci.fp) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 215 | /* |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 216 | * Floating point registers can't be restored. If the |
| 217 | * kernel currently uses floating point registers the |
| 218 | * system is stopped. If the process has its floating |
| 219 | * pointer registers loaded it is terminated. |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 220 | */ |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 221 | if (S390_lowcore.fpu_flags & KERNEL_VXR_V0V7) |
| 222 | s390_handle_damage(); |
| 223 | if (!test_cpu_flag(CIF_FPU)) |
| 224 | kill_task = 1; |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 225 | } |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 226 | if (!mci.fc) { |
Heiko Carstens | 5a79859a | 2015-02-12 13:08:27 +0100 | [diff] [blame] | 227 | /* |
| 228 | * Floating point control register can't be restored. |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 229 | * If the kernel currently uses the floating pointer |
| 230 | * registers and needs the FPC register the system is |
| 231 | * stopped. If the process has its floating pointer |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 232 | * registers loaded it is terminated. |
Heiko Carstens | 5a79859a | 2015-02-12 13:08:27 +0100 | [diff] [blame] | 233 | */ |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 234 | if (S390_lowcore.fpu_flags & KERNEL_FPC) |
| 235 | s390_handle_damage(); |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 236 | if (!test_cpu_flag(CIF_FPU)) |
| 237 | kill_task = 1; |
Heiko Carstens | 86fa708 | 2016-12-13 12:42:07 +0100 | [diff] [blame] | 238 | } |
Heiko Carstens | 5a79859a | 2015-02-12 13:08:27 +0100 | [diff] [blame] | 239 | |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 240 | if (MACHINE_HAS_VX) { |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 241 | if (!mci.vr) { |
Martin Schwidefsky | 8070361 | 2014-10-06 17:53:53 +0200 | [diff] [blame] | 242 | /* |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 243 | * Vector registers can't be restored. If the kernel |
| 244 | * currently uses vector registers the system is |
| 245 | * stopped. If the process has its vector registers |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 246 | * loaded it is terminated. |
Martin Schwidefsky | 8070361 | 2014-10-06 17:53:53 +0200 | [diff] [blame] | 247 | */ |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 248 | if (S390_lowcore.fpu_flags & KERNEL_VXR) |
| 249 | s390_handle_damage(); |
| 250 | if (!test_cpu_flag(CIF_FPU)) |
| 251 | kill_task = 1; |
Martin Schwidefsky | 8070361 | 2014-10-06 17:53:53 +0200 | [diff] [blame] | 252 | } |
Martin Schwidefsky | 8070361 | 2014-10-06 17:53:53 +0200 | [diff] [blame] | 253 | } |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 254 | /* Check if access registers are valid */ |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 255 | if (!mci.ar) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 256 | /* |
| 257 | * Access registers have unknown contents. |
| 258 | * Terminating task. |
| 259 | */ |
| 260 | kill_task = 1; |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 261 | } |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 262 | /* Check guarded storage registers */ |
Martin Schwidefsky | ad3bc0a | 2017-10-12 13:24:45 +0200 | [diff] [blame] | 263 | cr2.val = S390_lowcore.cregs_save_area[2]; |
| 264 | if (cr2.gse) { |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 265 | if (!mci.gs) { |
Martin Schwidefsky | 916cda1 | 2016-01-26 14:10:34 +0100 | [diff] [blame] | 266 | /* |
| 267 | * Guarded storage register can't be restored and |
| 268 | * the current processes uses guarded storage. |
| 269 | * It has to be terminated. |
| 270 | */ |
| 271 | kill_task = 1; |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 272 | } |
Martin Schwidefsky | 916cda1 | 2016-01-26 14:10:34 +0100 | [diff] [blame] | 273 | } |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 274 | /* Check if old PSW is valid */ |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 275 | if (!mci.wp) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 276 | /* |
| 277 | * Can't tell if we come from user or kernel mode |
| 278 | * -> stopping machine. |
| 279 | */ |
Heiko Carstens | 3d68286 | 2015-10-12 12:39:09 +0200 | [diff] [blame] | 280 | s390_handle_damage(); |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 281 | } |
| 282 | /* Check for invalid kernel instruction address */ |
| 283 | if (!mci.ia && !umode) { |
| 284 | /* |
| 285 | * The instruction address got lost while running |
| 286 | * in the kernel -> stopping machine. |
| 287 | */ |
| 288 | s390_handle_damage(); |
| 289 | } |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 290 | |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 291 | if (!mci.ms || !mci.pm || !mci.ia) |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 292 | kill_task = 1; |
| 293 | |
| 294 | return kill_task; |
| 295 | } |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 296 | NOKPROBE_SYMBOL(s390_check_registers); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 297 | |
QingFeng Hao | da72ca4 | 2017-06-07 11:41:19 +0200 | [diff] [blame] | 298 | /* |
| 299 | * Backup the guest's machine check info to its description block |
| 300 | */ |
| 301 | static void notrace s390_backup_mcck_info(struct pt_regs *regs) |
| 302 | { |
| 303 | struct mcck_volatile_info *mcck_backup; |
| 304 | struct sie_page *sie_page; |
| 305 | |
| 306 | /* r14 contains the sie block, which was set in sie64a */ |
| 307 | struct kvm_s390_sie_block *sie_block = |
| 308 | (struct kvm_s390_sie_block *) regs->gprs[14]; |
| 309 | |
| 310 | if (sie_block == NULL) |
| 311 | /* Something's seriously wrong, stop system. */ |
| 312 | s390_handle_damage(); |
| 313 | |
| 314 | sie_page = container_of(sie_block, struct sie_page, sie_block); |
| 315 | mcck_backup = &sie_page->mcck_info; |
| 316 | mcck_backup->mcic = S390_lowcore.mcck_interruption_code & |
| 317 | ~(MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE); |
| 318 | mcck_backup->ext_damage_code = S390_lowcore.external_damage_code; |
| 319 | mcck_backup->failing_storage_address |
| 320 | = S390_lowcore.failing_storage_address; |
| 321 | } |
Martin Schwidefsky | 00a8f88 | 2017-09-15 16:24:31 +0200 | [diff] [blame] | 322 | NOKPROBE_SYMBOL(s390_backup_mcck_info); |
QingFeng Hao | da72ca4 | 2017-06-07 11:41:19 +0200 | [diff] [blame] | 323 | |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 324 | #define MAX_IPD_COUNT 29 |
Heiko Carstens | 022e4fc | 2006-05-01 12:16:14 -0700 | [diff] [blame] | 325 | #define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */ |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 326 | |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 327 | #define ED_STP_ISLAND 6 /* External damage STP island check */ |
| 328 | #define ED_STP_SYNC 7 /* External damage STP sync check */ |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 329 | |
QingFeng Hao | c929500 | 2017-06-07 11:30:42 +0200 | [diff] [blame] | 330 | #define MCCK_CODE_NO_GUEST (MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE) |
| 331 | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 332 | /* |
| 333 | * machine check handler. |
| 334 | */ |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 335 | int notrace s390_do_machine_check(struct pt_regs *regs) |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 336 | { |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 337 | static int ipd_count; |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 338 | static DEFINE_SPINLOCK(ipd_lock); |
| 339 | static unsigned long long last_ipd; |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 340 | struct mcck_struct *mcck; |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 341 | unsigned long long tmp; |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 342 | union mci mci; |
QingFeng Hao | c929500 | 2017-06-07 11:30:42 +0200 | [diff] [blame] | 343 | unsigned long mcck_dam_code; |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 344 | int mcck_pending = 0; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 345 | |
Heiko Carstens | 81f64b8 | 2009-04-14 15:36:18 +0200 | [diff] [blame] | 346 | nmi_enter(); |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 347 | inc_irq_stat(NMI_NMI); |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 348 | mci.val = S390_lowcore.mcck_interruption_code; |
Christoph Lameter | eb7e7d7 | 2014-08-17 12:30:45 -0500 | [diff] [blame] | 349 | mcck = this_cpu_ptr(&cpu_mcck); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 350 | |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 351 | if (mci.sd) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 352 | /* System damage -> stopping machine */ |
Heiko Carstens | 3d68286 | 2015-10-12 12:39:09 +0200 | [diff] [blame] | 353 | s390_handle_damage(); |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 354 | } |
QingFeng Hao | c929500 | 2017-06-07 11:30:42 +0200 | [diff] [blame] | 355 | |
| 356 | /* |
| 357 | * Reinject the instruction processing damages' machine checks |
| 358 | * including Delayed Access Exception into the guest |
| 359 | * instead of damaging the host if they happen in the guest. |
| 360 | */ |
| 361 | if (mci.pd && !test_cpu_flag(CIF_MCCK_GUEST)) { |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 362 | if (mci.b) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 363 | /* Processing backup -> verify if we can survive this */ |
| 364 | u64 z_mcic, o_mcic, t_mcic; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 365 | z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29); |
| 366 | o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 | |
| 367 | 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 | |
| 368 | 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 | |
| 369 | 1ULL<<16); |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 370 | t_mcic = mci.val; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 371 | |
| 372 | if (((t_mcic & z_mcic) != 0) || |
| 373 | ((t_mcic & o_mcic) != o_mcic)) { |
Heiko Carstens | 3d68286 | 2015-10-12 12:39:09 +0200 | [diff] [blame] | 374 | s390_handle_damage(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 375 | } |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 376 | |
| 377 | /* |
| 378 | * Nullifying exigent condition, therefore we might |
| 379 | * retry this instruction. |
| 380 | */ |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 381 | spin_lock(&ipd_lock); |
Heiko Carstens | 1aae056 | 2013-01-30 09:49:40 +0100 | [diff] [blame] | 382 | tmp = get_tod_clock(); |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 383 | if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME) |
| 384 | ipd_count++; |
| 385 | else |
| 386 | ipd_count = 1; |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 387 | last_ipd = tmp; |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 388 | if (ipd_count == MAX_IPD_COUNT) |
Heiko Carstens | 3d68286 | 2015-10-12 12:39:09 +0200 | [diff] [blame] | 389 | s390_handle_damage(); |
Heiko Carstens | b73d40c | 2006-04-27 18:40:23 -0700 | [diff] [blame] | 390 | spin_unlock(&ipd_lock); |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 391 | } else { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 392 | /* Processing damage -> stopping machine */ |
Heiko Carstens | 3d68286 | 2015-10-12 12:39:09 +0200 | [diff] [blame] | 393 | s390_handle_damage(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 394 | } |
| 395 | } |
Martin Schwidefsky | 3037a52 | 2017-10-12 13:24:48 +0200 | [diff] [blame] | 396 | if (s390_check_registers(mci, user_mode(regs))) { |
Martin Schwidefsky | 8f149ea | 2016-08-22 14:40:06 +0200 | [diff] [blame] | 397 | /* |
| 398 | * Couldn't restore all register contents for the |
| 399 | * user space process -> mark task for termination. |
| 400 | */ |
| 401 | mcck->kill_task = 1; |
| 402 | mcck->mcck_code = mci.val; |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 403 | mcck_pending = 1; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 404 | } |
QingFeng Hao | da72ca4 | 2017-06-07 11:41:19 +0200 | [diff] [blame] | 405 | |
| 406 | /* |
| 407 | * Backup the machine check's info if it happens when the guest |
| 408 | * is running. |
| 409 | */ |
| 410 | if (test_cpu_flag(CIF_MCCK_GUEST)) |
| 411 | s390_backup_mcck_info(regs); |
| 412 | |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 413 | if (mci.cd) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 414 | /* Timing facility damage */ |
Heiko Carstens | 3d68286 | 2015-10-12 12:39:09 +0200 | [diff] [blame] | 415 | s390_handle_damage(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 416 | } |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 417 | if (mci.ed && mci.ec) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 418 | /* External damage */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 419 | if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC)) |
Heiko Carstens | 29b0a82 | 2015-10-09 13:48:03 +0200 | [diff] [blame] | 420 | mcck->stp_queue |= stp_sync_check(); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 421 | if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND)) |
Heiko Carstens | 29b0a82 | 2015-10-09 13:48:03 +0200 | [diff] [blame] | 422 | mcck->stp_queue |= stp_island_check(); |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 423 | mcck_pending = 1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 424 | } |
QingFeng Hao | c929500 | 2017-06-07 11:30:42 +0200 | [diff] [blame] | 425 | |
| 426 | /* |
| 427 | * Reinject storage related machine checks into the guest if they |
| 428 | * happen when the guest is running. |
| 429 | */ |
| 430 | if (!test_cpu_flag(CIF_MCCK_GUEST)) { |
| 431 | if (mci.se) |
| 432 | /* Storage error uncorrected */ |
| 433 | s390_handle_damage(); |
| 434 | if (mci.ke) |
| 435 | /* Storage key-error uncorrected */ |
| 436 | s390_handle_damage(); |
| 437 | if (mci.ds && mci.fa) |
| 438 | /* Storage degradation */ |
| 439 | s390_handle_damage(); |
| 440 | } |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 441 | if (mci.cp) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 442 | /* Channel report word pending */ |
| 443 | mcck->channel_report = 1; |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 444 | mcck_pending = 1; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 445 | } |
Heiko Carstens | dc6e155 | 2015-10-12 13:00:39 +0200 | [diff] [blame] | 446 | if (mci.w) { |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 447 | /* Warning pending */ |
| 448 | mcck->warning = 1; |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 449 | mcck_pending = 1; |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 450 | } |
QingFeng Hao | c929500 | 2017-06-07 11:30:42 +0200 | [diff] [blame] | 451 | |
| 452 | /* |
| 453 | * If there are only Channel Report Pending and External Damage |
| 454 | * machine checks, they will not be reinjected into the guest |
| 455 | * because they refer to host conditions only. |
| 456 | */ |
| 457 | mcck_dam_code = (mci.val & MCIC_SUBCLASS_MASK); |
| 458 | if (test_cpu_flag(CIF_MCCK_GUEST) && |
| 459 | (mcck_dam_code & MCCK_CODE_NO_GUEST) != mcck_dam_code) { |
| 460 | /* Set exit reason code for host's later handling */ |
| 461 | *((long *)(regs->gprs[15] + __SF_SIE_REASON)) = -EINTR; |
| 462 | } |
| 463 | clear_cpu_flag(CIF_MCCK_GUEST); |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 464 | |
| 465 | if (user_mode(regs) && mcck_pending) { |
| 466 | nmi_exit(); |
| 467 | return 1; |
| 468 | } |
| 469 | |
| 470 | if (mcck_pending) |
| 471 | schedule_mcck_handler(); |
| 472 | |
Heiko Carstens | 81f64b8 | 2009-04-14 15:36:18 +0200 | [diff] [blame] | 473 | nmi_exit(); |
Sven Schnelle | 0b0ed65 | 2020-02-20 12:09:36 +0100 | [diff] [blame] | 474 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
Martin Schwidefsky | 00a8f88 | 2017-09-15 16:24:31 +0200 | [diff] [blame] | 476 | NOKPROBE_SYMBOL(s390_do_machine_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 478 | static int __init machine_check_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 480 | ctl_set_bit(14, 25); /* enable external damage MCH */ |
Heiko Carstens | f5daba1 | 2009-03-26 15:24:01 +0100 | [diff] [blame] | 481 | ctl_set_bit(14, 27); /* enable system recovery MCH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | ctl_set_bit(14, 24); /* enable warning MCH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | return 0; |
| 484 | } |
Heiko Carstens | 24d05ff | 2015-08-17 08:09:17 +0200 | [diff] [blame] | 485 | early_initcall(machine_check_init); |