diff options
author | Avi Kivity <avi@qumranet.com> | 2007-05-24 05:23:10 -0400 |
---|---|---|
committer | Avi Kivity <avi@qumranet.com> | 2007-07-16 05:05:49 -0400 |
commit | db912f963909b3cbc3a059b7528f6a1a1eb6ffae (patch) | |
tree | 85d112b2879782fda2b2ca77413ac73361d0d3b0 /include | |
parent | e495606dd09d79f9fa496334ac3958f6ff179d82 (diff) |
HOTPLUG: Add CPU_DYING notifier
KVM wants a notification when a cpu is about to die, so it can disable
hardware extensions, but at a time when user processes cannot be scheduled
on the cpu, so it doesn't try to use virtualization extensions after they
have been disabled.
This adds a CPU_DYING notification. The notification is called in atomic
context on the doomed cpu.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/notifier.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/notifier.h b/include/linux/notifier.h index 9431101bf876..576f2bb34cc8 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h | |||
@@ -196,6 +196,8 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, | |||
196 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | 196 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ |
197 | #define CPU_LOCK_ACQUIRE 0x0008 /* Acquire all hotcpu locks */ | 197 | #define CPU_LOCK_ACQUIRE 0x0008 /* Acquire all hotcpu locks */ |
198 | #define CPU_LOCK_RELEASE 0x0009 /* Release all hotcpu locks */ | 198 | #define CPU_LOCK_RELEASE 0x0009 /* Release all hotcpu locks */ |
199 | #define CPU_DYING 0x000A /* CPU (unsigned)v not running any task, | ||
200 | * not handling interrupts, soon dead */ | ||
199 | 201 | ||
200 | /* Used for CPU hotplug events occuring while tasks are frozen due to a suspend | 202 | /* Used for CPU hotplug events occuring while tasks are frozen due to a suspend |
201 | * operation in progress | 203 | * operation in progress |
@@ -208,6 +210,7 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, | |||
208 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) | 210 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) |
209 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) | 211 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) |
210 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) | 212 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) |
213 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) | ||
211 | 214 | ||
212 | #endif /* __KERNEL__ */ | 215 | #endif /* __KERNEL__ */ |
213 | #endif /* _LINUX_NOTIFIER_H */ | 216 | #endif /* _LINUX_NOTIFIER_H */ |