From nobody Sun Feb 8 19:38:06 2026 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; dkim=fail; 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 ARC-Seal: i=1; a=rsa-sha256; t=1571940564; cv=none; d=zoho.com; s=zohoarc; b=N2n9Ti94tkoaDA8lMmu0Ok4DaLyft/mAmaVODYlpnOlPHteFkObNZdPTbZ9IS4O2BSH0nuEPXPGNrVcKjxoKQ4bByvTe5toIGRkM6qzYoDlJqEZ3dYwxpzkGBUgmrBVciFV8D5wOrOF0W7hH7LCNasMhkHkrPTwJIL+aYmns8u8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1571940564; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=T4PjgDwYwVllCjJyAa4O4jV5g3gFoiQ2rK589sd19L8=; b=bLFxUmacoWHELuaRTG7TkSPUTROCWnp9Br5qQrG65RaYSvE+xRyK+W7lqUezT6GBrCf7ua/EhE84lR28TMWSGvE0pX8NrxJs0SZTmhQdTg0PHcpFFu2xvNVkbD20IVHVrbf1VQHx2CT8qDgWVri/9tP5zxuBbl7fvrmsOTt4HsE= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; 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 header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1571940564827437.02011187715823; Thu, 24 Oct 2019 11:09:24 -0700 (PDT) Received: from localhost ([::1]:49788 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iNhXz-0002NB-Ad for importer@patchew.org; Thu, 24 Oct 2019 14:09:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37940) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iNgh1-0002D1-DB for qemu-devel@nongnu.org; Thu, 24 Oct 2019 13:14:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iNggz-0001p2-Ru for qemu-devel@nongnu.org; Thu, 24 Oct 2019 13:14:35 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:28021 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iNggy-0001lg-U1 for qemu-devel@nongnu.org; Thu, 24 Oct 2019 13:14:33 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-233-d9WzHKqiNyCoPTorYWETTQ-1; Thu, 24 Oct 2019 13:14:28 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5069D107AD31; Thu, 24 Oct 2019 17:14:27 +0000 (UTC) Received: from eperezma.remote.csb (ovpn-116-206.ams2.redhat.com [10.36.116.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8A65C5B681; Thu, 24 Oct 2019 17:14:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571937272; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=T4PjgDwYwVllCjJyAa4O4jV5g3gFoiQ2rK589sd19L8=; b=MRorIbYXiZEvIIiGFbCi2FZpN7mu/4EVpu6nH1kLU/VBDgxRcKbe492nWI5cnDJsl6KC4u Z7d+Z+hVf1t+jMnEmaWNBIuKCVn0uvP9Qd/C7O45XZrAnYvffW7cuVXYylbWYXa28Q/R7C v6T+pwJkociB3U47jopmEHi5NN4HRd0= From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Subject: [PATCH v6 2/9] virtio: device/driver area size calculation refactor for split ring Date: Thu, 24 Oct 2019 19:13:59 +0200 Message-Id: <20191024171406.12504-3-eperezma@redhat.com> In-Reply-To: <20191024171406.12504-1-eperezma@redhat.com> References: <20191024171406.12504-1-eperezma@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-MC-Unique: d9WzHKqiNyCoPTorYWETTQ-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Laurent Vivier , qemu-block@nongnu.org, Amit Shah , Jason Wang , "Michael S. Tsirkin" , Max Reitz , Stefan Hajnoczi , Paolo Bonzini , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Fam Zheng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Xu There is slight size difference between split/packed rings. This is the refactor of split ring as well as a helper to expanding device and driver area size calculation for packed ring. Signed-off-by: Wei Xu Signed-off-by: Jason Wang Reviewed-by: Jens Freimann --- hw/virtio/virtio.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index fdac203cdf..74cc10fad9 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -159,10 +159,8 @@ static void virtio_init_region_cache(VirtIODevice *vde= v, int n) VRingMemoryRegionCaches *old =3D vq->vring.caches; VRingMemoryRegionCaches *new =3D NULL; hwaddr addr, size; - int event_size; int64_t len; =20 - event_size =3D virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_I= DX) ? 2 : 0; =20 addr =3D vq->vring.desc; if (!addr) { @@ -177,7 +175,7 @@ static void virtio_init_region_cache(VirtIODevice *vdev= , int n) goto err_desc; } =20 - size =3D virtio_queue_get_used_size(vdev, n) + event_size; + size =3D virtio_queue_get_used_size(vdev, n); len =3D address_space_cache_init(&new->used, vdev->dma_as, vq->vring.used, size, true); if (len < size) { @@ -185,7 +183,7 @@ static void virtio_init_region_cache(VirtIODevice *vdev= , int n) goto err_used; } =20 - size =3D virtio_queue_get_avail_size(vdev, n) + event_size; + size =3D virtio_queue_get_avail_size(vdev, n); len =3D address_space_cache_init(&new->avail, vdev->dma_as, vq->vring.avail, size, false); if (len < size) { @@ -2414,14 +2412,20 @@ hwaddr virtio_queue_get_desc_size(VirtIODevice *vde= v, int n) =20 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) { + int s; + + s =3D virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; return offsetof(VRingAvail, ring) + - sizeof(uint16_t) * vdev->vq[n].vring.num; + sizeof(uint16_t) * vdev->vq[n].vring.num + s; } =20 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) { + int s; + + s =3D virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; return offsetof(VRingUsed, ring) + - sizeof(VRingUsedElem) * vdev->vq[n].vring.num; + sizeof(VRingUsedElem) * vdev->vq[n].vring.num + s; } =20 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) --=20 2.16.5