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Date: Thu, 24 Jul 2014 12:13:31 +0200 From: Andrew Jones <drjones@...hat.com> To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org Cc: uobergfe@...hat.com, dzickus@...hat.com, pbonzini@...hat.com, akpm@...ux-foundation.org, mingo@...hat.com Subject: [PATCH 3/3] kvm: ensure hard lockup detection is disabled by default From: Ulrich Obergfell <uobergfe@...hat.com> 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@...hat.com> Signed-off-by: Andrew Jones <drjones@...hat.com> --- arch/x86/kernel/kvm.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 3dd8e2c4d74a9..95c3cb16af3e5 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -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) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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