From patchwork Fri Nov 20 18:50:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 11921949 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 936CDC63798 for ; Fri, 20 Nov 2020 18:53:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 40CB22242B for ; Fri, 20 Nov 2020 18:53:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="chx1PoKw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732028AbgKTSwj (ORCPT ); Fri, 20 Nov 2020 13:52:39 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:46727 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731381AbgKTSwi (ORCPT ); Fri, 20 Nov 2020 13:52:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605898357; 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=Y17EVO/s0xg6tqcxCWG6nhFINdKj1LKpomp8rmt7L8A=; b=chx1PoKwHguedkukAvHrJivJv5Rwt98XLRA7ctOf0oCdpiyw+5LJEWeRcupj1lWtbT33uY AjHibdD8AZ68VGkEk4w2ag518WA7S+Zwd7poqC6n1gnGIRiWSssaVR/2OEJAqXoAOPG3U+ aDY8Jcv/ogccym8TEi93Bq4joN3SJL0= 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-392-H2Z1tymUMiSbaQlXOnSUjA-1; Fri, 20 Nov 2020 13:52:35 -0500 X-MC-Unique: H2Z1tymUMiSbaQlXOnSUjA-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7889F8144EC; Fri, 20 Nov 2020 18:52:32 +0000 (UTC) Received: from eperezma.remote.csb (ovpn-112-88.ams2.redhat.com [10.36.112.88]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0C9F25C1D5; Fri, 20 Nov 2020 18:52:16 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Lars Ganrot , virtualization@lists.linux-foundation.org, Salil Mehta , "Michael S. Tsirkin" , Liran Alon , Rob Miller , Max Gurtovoy , Alex Barba , Stefan Hajnoczi , Jim Harford , Jason Wang , Harpreet Singh Anand , Christophe Fontaine , vm , Daniel Daly , Michael Lilja , Stefano Garzarella , Nitin Shrivastav , Lee Ballard , Dmytro Kazantsev , Juan Quintela , kvm@vger.kernel.org, Howard Cai , Xiao W Wang , Sean Mooney , Parav Pandit , Eli Cohen , Siwei Liu , Stephen Finucane Subject: [RFC PATCH 06/27] virtio: Add virtio_queue_get_used_notify_split Date: Fri, 20 Nov 2020 19:50:44 +0100 Message-Id: <20201120185105.279030-7-eperezma@redhat.com> In-Reply-To: <20201120185105.279030-1-eperezma@redhat.com> References: <20201120185105.279030-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This function is just used for a few commits, so SW LM is developed incrementally, and it is deleted after it is useful. For a few commits, only the events (irqfd, eventfd) are forwarded. This series adds descriptors forwarding on top of that. Signed-off-by: Eugenio Pérez --- include/hw/virtio/virtio.h | 1 + hw/virtio/virtio.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index b7ece7a6a8..b9b8497ea0 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -225,6 +225,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id); void virtio_notify_config(VirtIODevice *vdev); +bool virtio_queue_get_used_notify_split(VirtQueue *vq); bool virtio_queue_get_notification(VirtQueue *vq); void virtio_queue_set_notification(VirtQueue *vq, int enable); diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index ceb58fda6c..3469946538 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -377,6 +377,20 @@ static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) vq->used_idx = val; } +bool virtio_queue_get_used_notify_split(VirtQueue *vq) +{ + VRingMemoryRegionCaches *caches; + hwaddr pa = offsetof(VRingUsed, flags); + uint16_t flags; + + RCU_READ_LOCK_GUARD(); + + caches = vring_get_region_caches(vq); + assert(caches); + flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); + return !(VRING_USED_F_NO_NOTIFY & flags); +} + /* Called within rcu_read_lock(). */ static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) {