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kvm/eventfd: Drain events from eventfd in irqfd_wakeup()

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Don't allow the events to accumulate in the eventfd counter, drain them
as they are handled.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20201027135523.646811-4-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Woodhouse 2020-10-27 13:55:23 +00:00 committed by Paolo Bonzini
parent b1b397aeef
commit b59e00dd8c
1 changed files with 3 additions and 0 deletions
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3
virt/kvm/eventfd.c
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@ -194,6 +194,9 @@ irqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)
int ret = 0;
if (flags & EPOLLIN) {
u64 cnt;
eventfd_ctx_do_read(irqfd->eventfd, &cnt);
idx = srcu_read_lock(&kvm->irq_srcu);
do {
seq = read_seqcount_begin(&irqfd->irq_entry_sc);