From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:50885) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RPxwq-000376-5B for qemu-devel@nongnu.org; Mon, 14 Nov 2011 09:55:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RPxwj-00044h-Q9 for qemu-devel@nongnu.org; Mon, 14 Nov 2011 09:55:48 -0500 Received: from mnementh.archaic.org.uk ([81.2.115.146]:59592) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RPxwj-00041k-If for qemu-devel@nongnu.org; Mon, 14 Nov 2011 09:55:41 -0500 From: Peter Maydell Date: Mon, 14 Nov 2011 14:55:25 +0000 Message-Id: <1321282528-19070-2-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1321282528-19070-1-git-send-email-peter.maydell@linaro.org> References: <1321282528-19070-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [RFC 1/4] 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 , Pawel Moll , patches@linaro.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.c | 6 ++++++ hw/virtio.h | 1 + 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/hw/virtio.c b/hw/virtio.c index 7011b5b..5bd43a1 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -619,6 +619,12 @@ 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 2d18209..352aba6 100644 --- a/hw/virtio.h +++ b/hw/virtio.h @@ -178,6 +178,7 @@ 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); -- 1.7.1