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[ Upstream commit5e68470f4e] Add eventfd for the vdpa callback so that user can signal it directly instead of triggering the callback. It will be used for vhost-vdpa case. Signed-off-by: Xie Yongji <xieyongji@bytedance.com> Message-Id: <20230323053043.35-9-xieyongji@bytedance.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Stable-dep-of:02e9e9366f("vhost_vdpa: assign irq bypass producer token correctly") Signed-off-by: Sasha Levin <sashal@kernel.org>