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KVM: x86: document KVM_REQ_PENDING_TIMER usage

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Document that KVM_REQ_PENDING_TIMER is implicitly used during guest
entry.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-03-23 14:15:53 -03:00 committed by Avi Kivity
parent de3e6480f7
commit 041b1359a2
1 changed files with 2 additions and 1 deletions
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arch/x86/kvm/timer.c
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@ -12,7 +12,8 @@ static int __kvm_timer_fn(struct kvm_vcpu *vcpu, struct kvm_timer *ktimer)
/*
* There is a race window between reading and incrementing, but we do
* not care about potentially loosing timer events in the !reinject
* case anyway.
* case anyway. Note: KVM_REQ_PENDING_TIMER is implicitly checked
* in vcpu_enter_guest.
*/
if (ktimer->reinject || !atomic_read(&ktimer->pending)) {
atomic_inc(&ktimer->pending);