Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932758AbaLDR04 (ORCPT ); Thu, 4 Dec 2014 12:26:56 -0500 Received: from mx1.redhat.com ([209.132.183.28]:59894 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932164AbaLDR0z (ORCPT ); Thu, 4 Dec 2014 12:26:55 -0500 Date: Thu, 4 Dec 2014 19:26:42 +0200 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Rusty Russell , Cornelia Huck , David Hildenbrand , virtualization@lists.linux-foundation.org Subject: [PATCH RFC 1/3] virtio: add API to detect legacy devices Message-ID: <1417713984-23771-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Mutt-Fcc: =sent Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin --- include/linux/virtio.h | 2 ++ drivers/virtio/virtio.c | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 2bbf626..d666bcb 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -108,6 +108,8 @@ struct virtio_device { void *priv; }; +bool virtio_device_is_legacy_only(struct virtio_device_id id); + static inline struct virtio_device *dev_to_virtio(struct device *_dev) { return container_of(_dev, struct virtio_device, dev); diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index fa6b75d..6b4c1113 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -267,6 +267,12 @@ static struct bus_type virtio_bus = { .remove = virtio_dev_remove, }; +bool virtio_device_is_legacy_only(struct virtio_device_id id) +{ + return id.device == VIRTIO_ID_BALLOON; +} +EXPORT_SYMBOL_GPL(register_virtio_driver); + int register_virtio_driver(struct virtio_driver *driver) { /* Catch this early. */ -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/