From nobody Thu Dec 18 19:37:25 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.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 1646746779716354.4009408228321; Tue, 8 Mar 2022 05:39:39 -0800 (PST) Received: from localhost ([::1]:52638 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nRa3u-0005MP-GP for importer@patchew.org; Tue, 08 Mar 2022 08:39:38 -0500 Received: from eggs.gnu.org ([209.51.188.92]:43352) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nRa0C-0001bg-FW for qemu-devel@nongnu.org; Tue, 08 Mar 2022 08:35:48 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:27219) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nRa0A-0002AE-JR for qemu-devel@nongnu.org; Tue, 08 Mar 2022 08:35:48 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-553-LLE_xHl8PQWs5eSSbQ3Wig-1; Tue, 08 Mar 2022 08:35:43 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2449A1006AA8; Tue, 8 Mar 2022 13:35:42 +0000 (UTC) Received: from localhost.localdomain (ovpn-12-181.pek2.redhat.com [10.72.12.181]) by smtp.corp.redhat.com (Postfix) with ESMTP id D96538547E; Tue, 8 Mar 2022 13:35:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646746546; 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=QDi0fgrrtN3Ja3ed2RbS2ulsTcsiXQpNz5YN3DJo0ZE=; b=ctat8BF7r4OaAFOnH++iRx6yImsSTJoGOV6QvIs16MNsP9e+/Hy+Adq8Gejab5tEhyemMW ZSsxg/xM3Jv0JjOz3q9TFNdDt15HuydUZu+/DfPHCP5V2+R197CLJTSEsVklk69mT4kxnp QJ1FCkUob8ZaY5CukDUSw2h5itl63Jg= X-MC-Unique: LLE_xHl8PQWs5eSSbQ3Wig-1 From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Subject: [PULL 02/15] vhost: Add VhostShadowVirtqueue Date: Tue, 8 Mar 2022 21:34:38 +0800 Message-Id: <20220308133451.25378-3-jasowang@redhat.com> In-Reply-To: <20220308133451.25378-1-jasowang@redhat.com> References: <20220308133451.25378-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.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; Received-SPF: pass client-ip=170.10.129.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: , Cc: =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Jason Wang , "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1646746781635100001 From: Eugenio P=C3=A9rez Vhost shadow virtqueue (SVQ) is an intermediate jump for virtqueue notifications and buffers, allowing qemu to track them. While qemu is forwarding the buffers and virtqueue changes, it is able to commit the memory it's being dirtied, the same way regular qemu's VirtIO devices do. This commit only exposes basic SVQ allocation and free. Next patches of the series add functionality like notifications and buffers forwarding. Acked-by: Michael S. Tsirkin Signed-off-by: Eugenio P=C3=A9rez Signed-off-by: Jason Wang --- hw/virtio/meson.build | 2 +- hw/virtio/vhost-shadow-virtqueue.c | 62 ++++++++++++++++++++++++++++++++++= ++++ hw/virtio/vhost-shadow-virtqueue.h | 28 +++++++++++++++++ 3 files changed, 91 insertions(+), 1 deletion(-) create mode 100644 hw/virtio/vhost-shadow-virtqueue.c create mode 100644 hw/virtio/vhost-shadow-virtqueue.h diff --git a/hw/virtio/meson.build b/hw/virtio/meson.build index 521f7d6..2dc8761 100644 --- a/hw/virtio/meson.build +++ b/hw/virtio/meson.build @@ -11,7 +11,7 @@ softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-= stub.c')) =20 virtio_ss =3D ss.source_set() virtio_ss.add(files('virtio.c')) -virtio_ss.add(when: 'CONFIG_VHOST', if_true: files('vhost.c', 'vhost-backe= nd.c')) +virtio_ss.add(when: 'CONFIG_VHOST', if_true: files('vhost.c', 'vhost-backe= nd.c', 'vhost-shadow-virtqueue.c')) virtio_ss.add(when: 'CONFIG_VHOST_USER', if_true: files('vhost-user.c')) virtio_ss.add(when: 'CONFIG_VHOST_VDPA', if_true: files('vhost-vdpa.c')) virtio_ss.add(when: 'CONFIG_VIRTIO_BALLOON', if_true: files('virtio-balloo= n.c')) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c new file mode 100644 index 0000000..c1db02c --- /dev/null +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -0,0 +1,62 @@ +/* + * vhost shadow virtqueue + * + * SPDX-FileCopyrightText: Red Hat, Inc. 2021 + * SPDX-FileContributor: Author: Eugenio P=C3=A9rez + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "hw/virtio/vhost-shadow-virtqueue.h" + +#include "qemu/error-report.h" + +/** + * Creates vhost shadow virtqueue, and instructs the vhost device to use t= he + * shadow methods and file descriptors. + * + * Returns the new virtqueue or NULL. + * + * In case of error, reason is reported through error_report. + */ +VhostShadowVirtqueue *vhost_svq_new(void) +{ + g_autofree VhostShadowVirtqueue *svq =3D g_new0(VhostShadowVirtqueue, = 1); + int r; + + r =3D event_notifier_init(&svq->hdev_kick, 0); + if (r !=3D 0) { + error_report("Couldn't create kick event notifier: %s (%d)", + g_strerror(errno), errno); + goto err_init_hdev_kick; + } + + r =3D event_notifier_init(&svq->hdev_call, 0); + if (r !=3D 0) { + error_report("Couldn't create call event notifier: %s (%d)", + g_strerror(errno), errno); + goto err_init_hdev_call; + } + + return g_steal_pointer(&svq); + +err_init_hdev_call: + event_notifier_cleanup(&svq->hdev_kick); + +err_init_hdev_kick: + return NULL; +} + +/** + * Free the resources of the shadow virtqueue. + * + * @pvq: gpointer to SVQ so it can be used by autofree functions. + */ +void vhost_svq_free(gpointer pvq) +{ + VhostShadowVirtqueue *vq =3D pvq; + event_notifier_cleanup(&vq->hdev_kick); + event_notifier_cleanup(&vq->hdev_call); + g_free(vq); +} diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-vi= rtqueue.h new file mode 100644 index 0000000..f1519e3 --- /dev/null +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -0,0 +1,28 @@ +/* + * vhost shadow virtqueue + * + * SPDX-FileCopyrightText: Red Hat, Inc. 2021 + * SPDX-FileContributor: Author: Eugenio P=C3=A9rez + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef VHOST_SHADOW_VIRTQUEUE_H +#define VHOST_SHADOW_VIRTQUEUE_H + +#include "qemu/event_notifier.h" + +/* Shadow virtqueue to relay notifications */ +typedef struct VhostShadowVirtqueue { + /* Shadow kick notifier, sent to vhost */ + EventNotifier hdev_kick; + /* Shadow call notifier, sent to vhost */ + EventNotifier hdev_call; +} VhostShadowVirtqueue; + +VhostShadowVirtqueue *vhost_svq_new(void); + +void vhost_svq_free(gpointer vq); +G_DEFINE_AUTOPTR_CLEANUP_FUNC(VhostShadowVirtqueue, vhost_svq_free); + +#endif --=20 2.7.4