From patchwork Mon Sep 17 10:00:31 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Evgeny Voevodin X-Patchwork-Id: 184380 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 6909B2C0086 for ; Mon, 17 Sep 2012 21:00:19 +1000 (EST) Received: from localhost ([::1]:35966 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TDY9A-0007z7-MP for incoming@patchwork.ozlabs.org; Mon, 17 Sep 2012 06:01:44 -0400 Received: from eggs.gnu.org ([208.118.235.92]:53205) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TDY8W-0006IQ-At for qemu-devel@nongnu.org; Mon, 17 Sep 2012 06:01:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TDY8M-00051d-AZ for qemu-devel@nongnu.org; Mon, 17 Sep 2012 06:01:04 -0400 Received: from mailout4.w1.samsung.com ([210.118.77.14]:24506) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TDY8M-00050P-5I for qemu-devel@nongnu.org; Mon, 17 Sep 2012 06:00:54 -0400 Received: from eusync3.samsung.com (mailout4.w1.samsung.com [210.118.77.14]) by mailout4.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MAH00F11NUDEU70@mailout4.w1.samsung.com> for qemu-devel@nongnu.org; Mon, 17 Sep 2012 11:01:25 +0100 (BST) Received: from evvoevodinPC.rnd.samsung.ru ([106.109.8.14]) by eusync3.samsung.com (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0MAH00DV7NT8FQ90@eusync3.samsung.com> for qemu-devel@nongnu.org; Mon, 17 Sep 2012 11:00:49 +0100 (BST) From: Evgeny Voevodin To: qemu-devel@nongnu.org Date: Mon, 17 Sep 2012 14:00:31 +0400 Message-id: <1347876042-22609-2-git-send-email-e.voevodin@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1347876042-22609-1-git-send-email-e.voevodin@samsung.com> References: <1347876042-22609-1-git-send-email-e.voevodin@samsung.com> X-TM-AS-MML: No X-detected-operating-system: by eggs.gnu.org: Solaris 10 (1203?) X-Received-From: 210.118.77.14 Cc: peter.maydell@linaro.org, kyungmin.park@samsung.com, aliguori@us.ibm.com, Evgeny Voevodin Subject: [Qemu-devel] [RFC v2 01/12] virtio: Add support for guest setting of queue size X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Peter Maydell The MMIO virtio transport spec allows the guest to tell the host how large the queue size is. Add virtio_queue_set_num() function which implements this in the QEMU common virtio support code. Signed-off-by: Peter Maydell Signed-off-by: Evgeny Voevodin --- hw/virtio.c | 6 ++++++ hw/virtio.h | 1 + 2 files changed, 7 insertions(+) diff --git a/hw/virtio.c b/hw/virtio.c index 209c763..5334326 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -628,6 +628,12 @@ target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n) return vdev->vq[n].pa; } +void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) +{ + vdev->vq[n].vring.num = num; + virtqueue_init(&vdev->vq[n]); +} + int virtio_queue_get_num(VirtIODevice *vdev, int n) { return vdev->vq[n].vring.num; diff --git a/hw/virtio.h b/hw/virtio.h index 7a4f564..eb9953f 100644 --- a/hw/virtio.h +++ b/hw/virtio.h @@ -177,6 +177,7 @@ void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr); target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n); +void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); int virtio_queue_get_num(VirtIODevice *vdev, int n); void virtio_queue_notify(VirtIODevice *vdev, int n); uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);