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context_tracking: move rcu_virt_note_context_switch out of kvm_host.h

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Make kvm_guest_{enter,exit} and __kvm_guest_{enter,exit} trivial wrappers
around the code in context_tracking.h.  Name the context_tracking.h functions
consistently with what those for kernel<->user switch.

Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2016-06-15 15:09:28 +02:00
parent fb6cec1492
commit ebaac17362
2 changed files with 38 additions and 25 deletions
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25
include/linux/kvm_host.h
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@ -878,40 +878,23 @@ static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
/* must be called with irqs disabled */
static inline void __kvm_guest_enter(void)
{
guest_enter();
/* 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 userspace from rcu point of view. In
* addition CPU may stay in a guest mode for quite a long time (up to
* one time slice). Lets treat guest mode as quiescent state, just like
* we do with user-mode execution.
*/
if (!context_tracking_cpu_is_enabled())
rcu_virt_note_context_switch(smp_processor_id());
guest_enter_irqoff();
}
/* must be called with irqs disabled */
static inline void __kvm_guest_exit(void)
{
guest_exit();
guest_exit_irqoff();
}
static inline void kvm_guest_enter(void)
{
unsigned long flags;
local_irq_save(flags);
__kvm_guest_enter();
local_irq_restore(flags);
guest_enter();
}
static inline void kvm_guest_exit(void)
{
unsigned long flags;
local_irq_save(flags);
__kvm_guest_exit();
local_irq_restore(flags);
guest_exit();
}
/*