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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/x86/kernel/crash.c
2 * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
4 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
6 * Copyright (C) IBM Corporation, 2004. All rights reserved.
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/smp.h>
14 #include <linux/reboot.h>
15 #include <linux/kexec.h>
16 #include <linux/delay.h>
17 #include <linux/elf.h>
18 #include <linux/elfcore.h>
20 #include <asm/processor.h>
21 #include <asm/hardirq.h>
23 #include <asm/hw_irq.h>
26 #include <linux/kdebug.h>
28 #include <asm/reboot.h>
29 #include <asm/virtext.h>
34 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
36 static void kdump_nmi_callback(int cpu
, struct die_args
*args
)
40 struct pt_regs fixed_regs
;
46 if (!user_mode_vm(regs
)) {
47 crash_fixup_ss_esp(&fixed_regs
, regs
);
51 crash_save_cpu(regs
, cpu
);
53 /* Disable VMX or SVM if needed.
55 * We need to disable virtualization on all CPUs.
56 * Having VMX or SVM enabled on any CPU may break rebooting
57 * after the kdump kernel has finished its task.
59 cpu_emergency_vmxoff();
60 cpu_emergency_svm_disable();
65 static void kdump_nmi_shootdown_cpus(void)
67 nmi_shootdown_cpus(kdump_nmi_callback
);
73 static void kdump_nmi_shootdown_cpus(void)
75 /* There are no cpus to shootdown */
79 void native_machine_crash_shutdown(struct pt_regs
*regs
)
81 /* This function is only called after the system
82 * has panicked or is otherwise in a critical state.
83 * The minimum amount of code to allow a kexec'd kernel
84 * to run successfully needs to happen here.
86 * In practice this means shooting down the other cpus in
89 /* The kernel is broken so disable interrupts */
92 kdump_nmi_shootdown_cpus();
94 /* Booting kdump kernel with VMX or SVM enabled won't work,
95 * because (among other limitations) we can't disable paging
96 * with the virt flags.
98 cpu_emergency_vmxoff();
99 cpu_emergency_svm_disable();
102 #if defined(CONFIG_X86_IO_APIC)
105 #ifdef CONFIG_HPET_TIMER
108 crash_save_cpu(regs
, safe_smp_processor_id());