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This patch introduces the support for setting memory region based host notifiers for virtio device. This is helpful when using a hardware accelerator for a virtio device, because hardware heavily depends on the notification, this will allow the guest driver in the VM to notify the hardware directly. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>