From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36855) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uz4lr-0007da-HX for qemu-devel@nongnu.org; Tue, 16 Jul 2013 08:54:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Uz4lk-0005J2-K4 for qemu-devel@nongnu.org; Tue, 16 Jul 2013 08:54:23 -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]:58717 helo=mnementh.archaic.org.uk) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uz4lk-0005Hl-EY for qemu-devel@nongnu.org; Tue, 16 Jul 2013 08:54:16 -0400 From: Peter Maydell Date: Tue, 16 Jul 2013 13:25:07 +0100 Message-Id: <1373977512-28932-4-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1373977512-28932-1-git-send-email-peter.maydell@linaro.org> References: <1373977512-28932-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PATCH v3 3/8] virtio: Add support for guest setting of queue size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Anthony Liguori , patches@linaro.org, Alexander Graf , Peter Crosthwaite , David Gibson , kvmarm@lists.cs.columbia.edu, KONRAD Frederic 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); -- 1.7.9.5