From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4CB12C43334 for ; Fri, 8 Jul 2022 11:03:31 +0000 (UTC) Received: from localhost ([::1]:38846 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o9lli-0004xO-CC for qemu-devel@archiver.kernel.org; Fri, 08 Jul 2022 07:03:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56054) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o9lZa-0000Qn-G4 for qemu-devel@nongnu.org; Fri, 08 Jul 2022 06:50:58 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:23543) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o9lZY-0007v2-K7 for qemu-devel@nongnu.org; Fri, 08 Jul 2022 06:50:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1657277455; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Iu3bbjElwEBqiK+itsNC8G6qxF/EszQyEjqbnfIQUdE=; b=WPUwjqjZ2cKfi/s81SciFiRudy4T8N6p6pXDItIFSUe2LsIQxuhGvkUVK/VjHbzwHpq0EO FtlduT6+LIgvrBCeA+7vSmJe2CmObxCiqo95Z9b5JJn3Bt/C6u6Y5Q5AiMNl1GLmGCr9bc VlzLhIL91xONtoridjkNaa7VYMKW4vY= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-179-mpYBCS0vP9-4OsLaM9p9DQ-1; Fri, 08 Jul 2022 06:50:52 -0400 X-MC-Unique: mpYBCS0vP9-4OsLaM9p9DQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 068473C0ED60; Fri, 8 Jul 2022 10:50:52 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id 318761121314; Fri, 8 Jul 2022 10:50:49 +0000 (UTC) From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Eric Blake , Stefan Hajnoczi , Liuxiangdong , Cindy Lu , Zhu Lingshan , "Gonglei (Arei)" , Laurent Vivier , Gautam Dawar , Stefano Garzarella , Markus Armbruster , Paolo Bonzini , Harpreet Singh Anand , Jason Wang , "Michael S. Tsirkin" , Eli Cohen , Parav Pandit , Cornelia Huck Subject: [PATCH 11/22] vhost: add vhost_svq_push_elem Date: Fri, 8 Jul 2022 12:50:02 +0200 Message-Id: <20220708105013.1899854-12-eperezma@redhat.com> In-Reply-To: <20220708105013.1899854-1-eperezma@redhat.com> References: <20220708105013.1899854-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This function allows external SVQ users to return guest's available buffers. Signed-off-by: Eugenio Pérez --- hw/virtio/vhost-shadow-virtqueue.h | 2 ++ hw/virtio/vhost-shadow-virtqueue.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h index 3e1bea12ca..855fa82e3e 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -82,6 +82,8 @@ typedef struct VhostShadowVirtqueue { bool vhost_svq_valid_features(uint64_t features, Error **errp); +void vhost_svq_push_elem(VhostShadowVirtqueue *svq, + const VirtQueueElement *elem, uint32_t len); void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd); void vhost_svq_set_svq_call_fd(VhostShadowVirtqueue *svq, int call_fd); void vhost_svq_get_vring_addr(const VhostShadowVirtqueue *svq, diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index 01caa5887e..2b0a268655 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -439,6 +439,22 @@ static SVQElement vhost_svq_get_buf(VhostShadowVirtqueue *svq, uint32_t *len) return svq_elem; } +/** + * Push an element to SVQ, returning it to the guest. + */ +void vhost_svq_push_elem(VhostShadowVirtqueue *svq, + const VirtQueueElement *elem, uint32_t len) +{ + virtqueue_push(svq->vq, elem, len); + if (svq->next_guest_avail_elem) { + /* + * Avail ring was full when vhost_svq_flush was called, so it's a + * good moment to make more descriptors available if possible. + */ + vhost_handle_guest_kick(svq); + } +} + static void vhost_svq_flush(VhostShadowVirtqueue *svq, bool check_for_avail_queue) { -- 2.31.1