From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56106) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V1EkQ-00038y-Tx for qemu-devel@nongnu.org; Mon, 22 Jul 2013 07:57:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1V1Eh8-0001E8-PS for qemu-devel@nongnu.org; Mon, 22 Jul 2013 07:54:34 -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]:58900 helo=mnementh.archaic.org.uk) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V1Eh8-0001Dk-Hy for qemu-devel@nongnu.org; Mon, 22 Jul 2013 07:54:26 -0400 From: Peter Maydell Date: Mon, 22 Jul 2013 12:43:40 +0100 Message-Id: <1374493427-3254-4-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1374493427-3254-1-git-send-email-peter.maydell@linaro.org> References: <1374493427-3254-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PULL 03/10] virtio: Add support for guest setting of queue size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: qemu-devel@nongnu.org, Paul Brook 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 Message-id: 1373977512-28932-4-git-send-email-peter.maydell@linaro.org --- 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 5d1d2be..65f378d 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -200,6 +200,7 @@ 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); -- 1.7.9.5