Commit b59e00dd authored Oct 27, 2020 by David Woodhouse Committed by Paolo Bonzini Nov 15, 2020

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



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>

parent b1b397ae

virt/kvm/eventfd.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

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