61d047be99
If the IOMMUs are still enabled when the kexec kernel boots access to the disk is not possible. This is bad for tools like kdump or anything else which wants to use PCI devices. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/*
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* Architecture specific (i386/x86_64) functions for kexec based crash dumps.
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*
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* Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
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*
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* Copyright (C) IBM Corporation, 2004. All rights reserved.
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*
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/reboot.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/elf.h>
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#include <linux/elfcore.h>
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#include <asm/processor.h>
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#include <asm/hardirq.h>
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#include <asm/nmi.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#include <asm/hpet.h>
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#include <linux/kdebug.h>
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#include <asm/cpu.h>
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#include <asm/reboot.h>
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#include <asm/virtext.h>
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#include <asm/iommu.h>
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#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
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static void kdump_nmi_callback(int cpu, struct die_args *args)
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{
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struct pt_regs *regs;
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#ifdef CONFIG_X86_32
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struct pt_regs fixed_regs;
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#endif
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regs = args->regs;
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#ifdef CONFIG_X86_32
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if (!user_mode_vm(regs)) {
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crash_fixup_ss_esp(&fixed_regs, regs);
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regs = &fixed_regs;
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}
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#endif
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crash_save_cpu(regs, cpu);
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/* Disable VMX or SVM if needed.
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*
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* We need to disable virtualization on all CPUs.
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* Having VMX or SVM enabled on any CPU may break rebooting
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* after the kdump kernel has finished its task.
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*/
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cpu_emergency_vmxoff();
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cpu_emergency_svm_disable();
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disable_local_APIC();
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}
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static void kdump_nmi_shootdown_cpus(void)
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{
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nmi_shootdown_cpus(kdump_nmi_callback);
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disable_local_APIC();
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}
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#else
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static void kdump_nmi_shootdown_cpus(void)
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{
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/* There are no cpus to shootdown */
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}
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#endif
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void native_machine_crash_shutdown(struct pt_regs *regs)
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{
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/* This function is only called after the system
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* has panicked or is otherwise in a critical state.
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* The minimum amount of code to allow a kexec'd kernel
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* to run successfully needs to happen here.
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*
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* In practice this means shooting down the other cpus in
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* an SMP system.
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*/
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/* The kernel is broken so disable interrupts */
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local_irq_disable();
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kdump_nmi_shootdown_cpus();
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/* Booting kdump kernel with VMX or SVM enabled won't work,
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* because (among other limitations) we can't disable paging
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* with the virt flags.
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*/
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cpu_emergency_vmxoff();
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cpu_emergency_svm_disable();
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lapic_shutdown();
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#if defined(CONFIG_X86_IO_APIC)
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disable_IO_APIC();
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#endif
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#ifdef CONFIG_HPET_TIMER
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hpet_disable();
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#endif
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#ifdef CONFIG_X86_64
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pci_iommu_shutdown();
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#endif
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crash_save_cpu(regs, safe_smp_processor_id());
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}
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