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KVM: Fix racy event propagation in timer

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Minor issue that likely had no practical relevance: the kvm timer
function so far incremented the pending counter and then may reset it
again to 1 in case reinjection was disabled. This opened a small racy
window with the corresponding VCPU loop that may have happened to run
on another (real) CPU and already consumed the value.

Fix it by skipping the incrementation in case pending is already > 0.
This opens a different race windows, but may only rarely cause lost
events in case we do not care about them anyway (!reinject).

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2009-06-09 15:37:01 +02:00 committed by Avi Kivity
parent 33e4c68656
commit f7104db26a
1 changed files with 10 additions and 6 deletions
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16
arch/x86/kvm/timer.c
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@ -9,12 +9,16 @@ static int __kvm_timer_fn(struct kvm_vcpu *vcpu, struct kvm_timer *ktimer)
int restart_timer = 0;
wait_queue_head_t *q = &vcpu->wq;
/* FIXME: this code should not know anything about vcpus */
if (!atomic_inc_and_test(&ktimer->pending))
set_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
if (!ktimer->reinject)
atomic_set(&ktimer->pending, 1);
/*
* There is a race window between reading and incrementing, but we do
* not care about potentially loosing timer events in the !reinject
* case anyway.
*/
if (ktimer->reinject || !atomic_read(&ktimer->pending)) {
/* FIXME: this code should not know anything about vcpus */
if (!atomic_inc_and_test(&ktimer->pending))
set_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
}
if (waitqueue_active(q))
wake_up_interruptible(q);