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Commit 9919e39a authored by Ulrich Obergfell's avatar Ulrich Obergfell Committed by Linus Torvalds
Browse files

kvm: ensure hard lockup detection is disabled by default 



Use watchdog_enable_hardlockup_detector() to set hard lockup detection's
default value to false.  It's risky to run this detection in a guest, as
false positives are easy to trigger, especially if the host is
overcommitted.

Signed-off-by: default avatarUlrich Obergfell <uobergfe@redhat.com>
Signed-off-by: default avatarAndrew Jones <drjones@redhat.com>
Signed-off-by: default avatarDon Zickus <dzickus@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6e7458a6

arch/x86/kernel/kvm.c

+8 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <linux/slab.h>

#include <linux/kprobes.h>

#include <linux/debugfs.h>

#include <linux/nmi.h>

#include <asm/timer.h>

#include <asm/cpu.h>

#include <asm/traps.h>
@@ -499,6 +500,13 @@ void __init kvm_guest_init(void) 
#else

	kvm_guest_cpu_init();

#endif



	/*

	 * Hard lockup detection is enabled by default. Disable it, as guests

	 * can get false positives too easily, for example if the host is

	 * overcommitted.

	 */

	watchdog_enable_hardlockup_detector(false);

}



static noinline uint32_t __kvm_cpuid_base(void)