From patchwork Fri Jul 12 20:36:57 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 258805 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id E41712C02EF for ; Sat, 13 Jul 2013 07:11:16 +1000 (EST) Received: from localhost ([::1]:44215 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UxkcU-0001Sm-OM for incoming@patchwork.ozlabs.org; Fri, 12 Jul 2013 17:11:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47718) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uxkc7-0001SW-Ch for qemu-devel@nongnu.org; Fri, 12 Jul 2013 17:10:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Uxkc3-0005gB-9a for qemu-devel@nongnu.org; Fri, 12 Jul 2013 17:10:50 -0400 Received: from 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.1.0.0.b.8.0.1.0.0.2.ip6.arpa ([2001:8b0:1d0::1]:58567 helo=mnementh.archaic.org.uk) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UxkMO-0006Z0-5e for qemu-devel@nongnu.org; Fri, 12 Jul 2013 16:54:36 -0400 Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.80) (envelope-from ) id 1Uxk5P-00069P-6p; Fri, 12 Jul 2013 21:37:03 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Date: Fri, 12 Jul 2013 21:36:57 +0100 Message-Id: <1373661422-23606-4-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1373661422-23606-1-git-send-email-peter.maydell@linaro.org> References: <1373661422-23606-1-git-send-email-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:8b0:1d0::1 Cc: Anthony Liguori , David Gibson , kvmarm@lists.cs.columbia.edu, Alexander Graf , patches@linaro.org Subject: [Qemu-devel] [PATCH v2 3/8] 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 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 --- hw/virtio/virtio.c | 8 ++++++++ include/hw/virtio/virtio.h | 1 + 2 files changed, 9 insertions(+) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 8176c14..01b05f3 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -667,6 +667,14 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) return vdev->vq[n].pa; } +void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) +{ + if (num <= VIRTQUEUE_MAX_SIZE) { + 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/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index a6c5c53..95c4772 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -198,6 +198,7 @@ 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, hwaddr addr); hwaddr 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);