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authorUlrich Obergfell <uobergfe@redhat.com>2014-10-13 15:55:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-14 02:18:27 +0200
commit9919e39a17381058dd0cdef2f78dbf5619e26474 (patch)
tree9fddb1c5b884a6055ea8d28974acb67e07be1069
parent6e7458a6f074c71e74cda31c483114e65ea0f570 (diff)
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>
-rw-r--r--arch/x86/kernel/kvm.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 3dd8e2c4d74..95c3cb16af3 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)