From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35728) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gPpeJ-0004E3-8T for qemu-devel@nongnu.org; Thu, 22 Nov 2018 09:08:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gPpeH-0007uC-1u for qemu-devel@nongnu.org; Thu, 22 Nov 2018 09:08:07 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47014) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gPpeG-0007oa-RT for qemu-devel@nongnu.org; Thu, 22 Nov 2018 09:08:04 -0500 From: wexu@redhat.com Date: Thu, 22 Nov 2018 09:06:09 -0500 Message-Id: <1542895581-10721-5-git-send-email-wexu@redhat.com> In-Reply-To: <1542895581-10721-1-git-send-email-wexu@redhat.com> References: <1542895581-10721-1-git-send-email-wexu@redhat.com> Subject: [Qemu-devel] [PATCH v1 04/16] virtio: expand offset calculation for packed ring List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: jasowang@redhat.com, qemu-devel@nongnu.org Cc: mst@redhat.com, wexu@redhat.com, jfreimann@redhat.com, maxime.coquelin@redhat.com, tiwei.bie@intel.com From: Wei Xu Expand 1.0 to 1.1 by adding offset calculation accordingly. Signed-off-by: Wei Xu --- hw/virtio/virtio.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index a8e737c..a41c2d3 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2336,14 +2336,28 @@ hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) { - return offsetof(VRingAvail, ring) + - sizeof(uint16_t) * vdev->vq[n].vring.num; + int s; + + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + return sizeof(struct VRingPackedDescEvent); + } else { + s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; + return offsetof(VRingAvail, ring) + + sizeof(uint16_t) * vdev->vq[n].vring.num + s; + } } hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) { - return offsetof(VRingUsed, ring) + - sizeof(VRingUsedElem) * vdev->vq[n].vring.num; + int s; + + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + return sizeof(struct VRingPackedDescEvent); + } else { + s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; + return offsetof(VRingUsed, ring) + + sizeof(VRingUsedElem) * vdev->vq[n].vring.num + s; + } } uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) -- 1.8.3.1