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author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-01-20 23:50:22 (GMT) |
---|---|---|
committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-01-27 19:35:40 (GMT) |
commit | c11f11fcbdb5be790c565aed46411486a7586afc (patch) | |
tree | 56552d483192df72e9c2bbb4c3b976ba05740626 /include | |
parent | 6fac4829ce0ef9b7f24369086ce5f0e9f38d37bc (diff) | |
download | linux-c11f11fcbdb5be790c565aed46411486a7586afc.tar.xz |
kvm: Prepare to add generic guest entry/exit callbacks
Do some ground preparatory work before adding guest_enter()
and guest_exit() context tracking callbacks. Those will
be later used to read the guest cputime safely when we
run in full dynticks mode.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/kvm_host.h | 39 | ||||
-rw-r--r-- | include/linux/vtime.h | 2 |
2 files changed, 30 insertions, 11 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2c497ab..4fe2396 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -22,6 +22,7 @@ #include <linux/rcupdate.h> #include <linux/ratelimit.h> #include <linux/err.h> +#include <linux/irqflags.h> #include <asm/signal.h> #include <linux/kvm.h> @@ -740,15 +741,36 @@ static inline int kvm_deassign_device(struct kvm *kvm, } #endif /* CONFIG_IOMMU_API */ -static inline void kvm_guest_enter(void) +static inline void guest_enter(void) { - BUG_ON(preemptible()); /* * This is running in ioctl context so we can avoid * the call to vtime_account() with its unnecessary idle check. */ - vtime_account_system_irqsafe(current); + vtime_account_system(current); current->flags |= PF_VCPU; +} + +static inline void guest_exit(void) +{ + /* + * This is running in ioctl context so we can avoid + * the call to vtime_account() with its unnecessary idle check. + */ + vtime_account_system(current); + current->flags &= ~PF_VCPU; +} + +static inline void kvm_guest_enter(void) +{ + unsigned long flags; + + BUG_ON(preemptible()); + + local_irq_save(flags); + guest_enter(); + local_irq_restore(flags); + /* KVM does not hold any references to rcu protected data when it * switches CPU into a guest mode. In fact switching to a guest mode * is very similar to exiting to userspase from rcu point of view. In @@ -761,12 +783,11 @@ static inline void kvm_guest_enter(void) static inline void kvm_guest_exit(void) { - /* - * This is running in ioctl context so we can avoid - * the call to vtime_account() with its unnecessary idle check. - */ - vtime_account_system_irqsafe(current); - current->flags &= ~PF_VCPU; + unsigned long flags; + + local_irq_save(flags); + guest_exit(); + local_irq_restore(flags); } /* diff --git a/include/linux/vtime.h b/include/linux/vtime.h index 5368af9..bb50c3c 100644 --- a/include/linux/vtime.h +++ b/include/linux/vtime.h @@ -6,7 +6,6 @@ struct task_struct; #ifdef CONFIG_VIRT_CPU_ACCOUNTING extern void vtime_task_switch(struct task_struct *prev); extern void vtime_account_system(struct task_struct *tsk); -extern void vtime_account_system_irqsafe(struct task_struct *tsk); extern void vtime_account_idle(struct task_struct *tsk); extern void vtime_account_user(struct task_struct *tsk); extern void vtime_account(struct task_struct *tsk); @@ -20,7 +19,6 @@ static inline bool vtime_accounting_enabled(void) { return true; } #else /* !CONFIG_VIRT_CPU_ACCOUNTING */ static inline void vtime_task_switch(struct task_struct *prev) { } static inline void vtime_account_system(struct task_struct *tsk) { } -static inline void vtime_account_system_irqsafe(struct task_struct *tsk) { } static inline void vtime_account_user(struct task_struct *tsk) { } static inline void vtime_account(struct task_struct *tsk) { } static inline bool vtime_accounting_enabled(void) { return false; } |