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| author | Ulrich Obergfell <uobergfe@redhat.com> | 2014-10-13 15:55:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-14 02:18:27 +0200 |
| commit | 9919e39a17381058dd0cdef2f78dbf5619e26474 (patch) | |
| tree | 9fddb1c5b884a6055ea8d28974acb67e07be1069 /arch | |
| parent | 6e7458a6f074c71e74cda31c483114e65ea0f570 (diff) | |
| download | lwn-9919e39a17381058dd0cdef2f78dbf5619e26474.tar.gz lwn-9919e39a17381058dd0cdef2f78dbf5619e26474.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/kvm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 3dd8e2c4d74a..95c3cb16af3e 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) |