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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: Ulrich Obergfell <uobergfe@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ulrich Obergfell 2014-10-13 15:55:37 -07:00 committed by Linus Torvalds
parent 6e7458a6f0
commit 9919e39a17
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/kvm.c
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@ -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)