Commit da06a43d authored Nov 04, 2015 by Takao Indoh Committed by Ingo Molnar Nov 23, 2015

perf, x86: Stop Intel PT before kdump starts



This patch stops Intel PT logging and saves its registers in memory
before kdump is started. This feature is needed to prevent Intel PT from
overwriting its log buffer after panic, and saved registers are needed to
find the last position where Intel PT wrote data.

After the crash dump is captured by kdump, users can retrieve the log buffer
from the vmcore and use it to investigate bad kernel behavior.

Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin<alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: H.Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Vivek Goyal <vgoyal@redhat.com>
Link: http://lkml.kernel.org/r/1446614553-6072-3-git-send-email-indou.takao@jp.fujitsu.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 24cc12b1

arch/x86/kernel/crash.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,7 @@
		#include <asm/cpu.h>
		#include <asm/reboot.h>
		#include <asm/virtext.h>
		#include <asm/intel_pt.h>

		/* Alignment required for elf header segment */
		#define ELF_CORE_HEADER_ALIGN 4096
		@@ -125,6 +126,11 @@ static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
		cpu_emergency_vmxoff();
		cpu_emergency_svm_disable();

		/*
		* Disable Intel PT to stop its logging
		*/
		cpu_emergency_stop_pt();

		disable_local_APIC();
		}

		@@ -169,6 +175,11 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
		cpu_emergency_vmxoff();
		cpu_emergency_svm_disable();

		/*
		* Disable Intel PT to stop its logging
		*/
		cpu_emergency_stop_pt();

		#ifdef CONFIG_X86_IO_APIC
		/* Prevent crash_kexec() from deadlocking on ioapic_lock. */
		ioapic_zap_locks();

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