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Commit | Line | Data |
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5033cba0 | 1 | /* |
62a31a03 | 2 | * Architecture specific (i386/x86_64) functions for kexec based crash dumps. |
5033cba0 EB |
3 | * |
4 | * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) | |
5 | * | |
6 | * Copyright (C) IBM Corporation, 2004. All rights reserved. | |
7 | * | |
8 | */ | |
9 | ||
5033cba0 EB |
10 | #include <linux/types.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/smp.h> | |
5033cba0 EB |
13 | #include <linux/reboot.h> |
14 | #include <linux/kexec.h> | |
5033cba0 EB |
15 | #include <linux/delay.h> |
16 | #include <linux/elf.h> | |
17 | #include <linux/elfcore.h> | |
f23d1f4a | 18 | #include <linux/module.h> |
5033cba0 EB |
19 | |
20 | #include <asm/processor.h> | |
21 | #include <asm/hardirq.h> | |
22 | #include <asm/nmi.h> | |
23 | #include <asm/hw_irq.h> | |
19842d67 | 24 | #include <asm/apic.h> |
0c1b2724 | 25 | #include <asm/hpet.h> |
1eeb66a1 | 26 | #include <linux/kdebug.h> |
96b89dc6 | 27 | #include <asm/cpu.h> |
ed23dc6f | 28 | #include <asm/reboot.h> |
2340b62f | 29 | #include <asm/virtext.h> |
8e294786 | 30 | |
5edd19af CW |
31 | int in_crash_kexec; |
32 | ||
f23d1f4a ZY |
33 | /* |
34 | * This is used to VMCLEAR all VMCSs loaded on the | |
35 | * processor. And when loading kvm_intel module, the | |
36 | * callback function pointer will be assigned. | |
37 | * | |
38 | * protected by rcu. | |
39 | */ | |
0ca0d818 | 40 | crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss = NULL; |
f23d1f4a ZY |
41 | EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss); |
42 | ||
43 | static inline void cpu_crash_vmclear_loaded_vmcss(void) | |
44 | { | |
0ca0d818 | 45 | crash_vmclear_fn *do_vmclear_operation = NULL; |
f23d1f4a ZY |
46 | |
47 | rcu_read_lock(); | |
48 | do_vmclear_operation = rcu_dereference(crash_vmclear_loaded_vmcss); | |
49 | if (do_vmclear_operation) | |
50 | do_vmclear_operation(); | |
51 | rcu_read_unlock(); | |
52 | } | |
53 | ||
b2bbe71b EH |
54 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) |
55 | ||
9c48f1c6 | 56 | static void kdump_nmi_callback(int cpu, struct pt_regs *regs) |
c4ac4263 | 57 | { |
1fb473d8 | 58 | #ifdef CONFIG_X86_32 |
4d55476c | 59 | struct pt_regs fixed_regs; |
a7d41820 | 60 | |
a7d41820 EH |
61 | if (!user_mode_vm(regs)) { |
62 | crash_fixup_ss_esp(&fixed_regs, regs); | |
63 | regs = &fixed_regs; | |
64 | } | |
65 | #endif | |
66 | crash_save_cpu(regs, cpu); | |
67 | ||
f23d1f4a ZY |
68 | /* |
69 | * VMCLEAR VMCSs loaded on all cpus if needed. | |
70 | */ | |
71 | cpu_crash_vmclear_loaded_vmcss(); | |
72 | ||
2340b62f EH |
73 | /* Disable VMX or SVM if needed. |
74 | * | |
75 | * We need to disable virtualization on all CPUs. | |
76 | * Having VMX or SVM enabled on any CPU may break rebooting | |
77 | * after the kdump kernel has finished its task. | |
78 | */ | |
79 | cpu_emergency_vmxoff(); | |
80 | cpu_emergency_svm_disable(); | |
81 | ||
a7d41820 EH |
82 | disable_local_APIC(); |
83 | } | |
84 | ||
d1e7b91c EH |
85 | static void kdump_nmi_shootdown_cpus(void) |
86 | { | |
5edd19af | 87 | in_crash_kexec = 1; |
8e294786 | 88 | nmi_shootdown_cpus(kdump_nmi_callback); |
d1e7b91c | 89 | |
19842d67 | 90 | disable_local_APIC(); |
c4ac4263 | 91 | } |
d1e7b91c | 92 | |
c4ac4263 | 93 | #else |
d1e7b91c | 94 | static void kdump_nmi_shootdown_cpus(void) |
c4ac4263 EB |
95 | { |
96 | /* There are no cpus to shootdown */ | |
97 | } | |
98 | #endif | |
99 | ||
ed23dc6f | 100 | void native_machine_crash_shutdown(struct pt_regs *regs) |
5033cba0 EB |
101 | { |
102 | /* This function is only called after the system | |
f18190bd | 103 | * has panicked or is otherwise in a critical state. |
5033cba0 EB |
104 | * The minimum amount of code to allow a kexec'd kernel |
105 | * to run successfully needs to happen here. | |
106 | * | |
107 | * In practice this means shooting down the other cpus in | |
108 | * an SMP system. | |
109 | */ | |
c4ac4263 EB |
110 | /* The kernel is broken so disable interrupts */ |
111 | local_irq_disable(); | |
a3ea8ac8 | 112 | |
d1e7b91c | 113 | kdump_nmi_shootdown_cpus(); |
2340b62f | 114 | |
f23d1f4a ZY |
115 | /* |
116 | * VMCLEAR VMCSs loaded on this cpu if needed. | |
117 | */ | |
118 | cpu_crash_vmclear_loaded_vmcss(); | |
119 | ||
2340b62f EH |
120 | /* Booting kdump kernel with VMX or SVM enabled won't work, |
121 | * because (among other limitations) we can't disable paging | |
122 | * with the virt flags. | |
123 | */ | |
124 | cpu_emergency_vmxoff(); | |
125 | cpu_emergency_svm_disable(); | |
126 | ||
17405453 YY |
127 | #ifdef CONFIG_X86_IO_APIC |
128 | /* Prevent crash_kexec() from deadlocking on ioapic_lock. */ | |
129 | ioapic_zap_locks(); | |
19842d67 | 130 | disable_IO_APIC(); |
0c1b2724 | 131 | #endif |
522e6646 | 132 | lapic_shutdown(); |
0c1b2724 OH |
133 | #ifdef CONFIG_HPET_TIMER |
134 | hpet_disable(); | |
19842d67 | 135 | #endif |
85916f81 | 136 | crash_save_cpu(regs, safe_smp_processor_id()); |
5033cba0 | 137 | } |