From nobody Fri Nov 7 10:16:23 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1547664286839436.9342161475191; Wed, 16 Jan 2019 10:44:46 -0800 (PST) Received: from localhost ([127.0.0.1]:46691 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gjqBB-0004IJ-Si for importer@patchew.org; Wed, 16 Jan 2019 13:44:45 -0500 Received: from eggs.gnu.org ([209.51.188.92]:47348) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gjpzY-0003f0-Vt for qemu-devel@nongnu.org; Wed, 16 Jan 2019 13:32:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gjpzX-0007zn-V1 for qemu-devel@nongnu.org; Wed, 16 Jan 2019 13:32:44 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50264) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gjpzX-0007vs-NB for qemu-devel@nongnu.org; Wed, 16 Jan 2019 13:32:43 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 91600A7865; Wed, 16 Jan 2019 18:32:40 +0000 (UTC) Received: from dell-per430-12.lab.eng.pek2.redhat.com (dell-per430-12.lab.eng.pek2.redhat.com [10.73.196.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3CB875C1B4; Wed, 16 Jan 2019 18:32:32 +0000 (UTC) From: wexu@redhat.com To: wexu@redhat.com, tiwei.bie@intel.com, qemu-devel@nongnu.org Date: Wed, 16 Jan 2019 13:31:17 -0500 Message-Id: <1547663480-547-13-git-send-email-wexu@redhat.com> In-Reply-To: <1547663480-547-1-git-send-email-wexu@redhat.com> References: <1547663480-547-1-git-send-email-wexu@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 16 Jan 2019 18:32:40 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 12/15] virtio: add vhost-net migration for packed ring X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jasowang@redhat.com, maxime.coquelin@redhat.com, jfreiman@redhat.com, mst@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Xu Signed-off-by: Wei Xu --- hw/virtio/virtio.c | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 722a4fd..0cb912e 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2991,17 +2991,34 @@ hwaddr virtio_queue_get_used_size(VirtIODevice *vde= v, int n) =20 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) { - return vdev->vq[n].last_avail_idx; + uint16_t idx; + + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + idx =3D vdev->vq[n].last_avail_idx; + idx |=3D ((int)vdev->vq[n].avail_wrap_counter) << 15; + } else { + idx =3D (int)vdev->vq[n].last_avail_idx; + } + return idx; } =20 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t i= dx) { - vdev->vq[n].last_avail_idx =3D idx; - vdev->vq[n].shadow_avail_idx =3D idx; + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + vdev->vq[n].last_avail_idx =3D idx & 0x7fff; + vdev->vq[n].avail_wrap_counter =3D !!(idx & 0x8000); + } else { + vdev->vq[n].last_avail_idx =3D idx; + vdev->vq[n].shadow_avail_idx =3D idx; + } } =20 void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n) { + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + return; + } + rcu_read_lock(); if (vdev->vq[n].vring.desc) { vdev->vq[n].last_avail_idx =3D vring_used_idx(&vdev->vq[n]); @@ -3012,6 +3029,10 @@ void virtio_queue_restore_last_avail_idx(VirtIODevic= e *vdev, int n) =20 void virtio_queue_update_used_idx(VirtIODevice *vdev, int n) { + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + return; + } + rcu_read_lock(); if (vdev->vq[n].vring.desc) { vdev->vq[n].used_idx =3D vring_used_idx(&vdev->vq[n]); --=20 1.8.3.1