From patchwork Tue Sep 10 17:58:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13799198 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 E6148EDE9AB for ; Tue, 10 Sep 2024 18:02:18 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1so59H-0000nQ-G3; Tue, 10 Sep 2024 13:59:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1so59G-0000dY-1S for qemu-devel@nongnu.org; Tue, 10 Sep 2024 13:59:30 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1so59D-0006U8-KG for qemu-devel@nongnu.org; Tue, 10 Sep 2024 13:59:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1725991167; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=75nB3XlxHtyFpg5pWr/5/YeyWJyE2v0N5lLtydj1lT8=; b=UdMRGcQqoShmU6EhcYZ7KMQAgKTiNFfdhL+aiPY634HGxDUNAotBKFRfRGTaXykGozf7sv C4Paa5syt1QG7/D7MMCP5nFIAvq0xsdRhiDoFz4EzoATUOxvzlsHqkZfXJl0/brRoq1n5a +YOLyY8SQUfwm2EYq8HmyBm8Lsz9WTk= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-568-dBmsZHunPGScXd29v6yp3g-1; Tue, 10 Sep 2024 13:59:23 -0400 X-MC-Unique: dBmsZHunPGScXd29v6yp3g-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id BFFE0195394A; Tue, 10 Sep 2024 17:59:21 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.22.32.182]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 800C019560AD; Tue, 10 Sep 2024 17:59:17 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Cc: qemu-s390x@nongnu.org, David Hildenbrand , Paolo Bonzini , Thomas Huth , Halil Pasic , Christian Borntraeger , Eric Farman , Richard Henderson , Ilya Leoshkevich , Janosch Frank , "Michael S. Tsirkin" , Cornelia Huck Subject: [PATCH v1 13/14] s390x/virtio-ccw: add support for virtio based memory devices Date: Tue, 10 Sep 2024 19:58:08 +0200 Message-ID: <20240910175809.2135596-14-david@redhat.com> In-Reply-To: <20240910175809.2135596-1-david@redhat.com> References: <20240910175809.2135596-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@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=-0.145, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org Let's implement support for abstract virtio based memory devices, using the virtio-pci implementation as an orientation. As we neither support virtio-mem or virtio-pmem yet, the code is effectively unused and not wired up. We'll implement support for virtio-mem based on this next. Signed-off-by: David Hildenbrand --- MAINTAINERS | 2 + hw/s390x/meson.build | 1 + hw/s390x/virtio-ccw-md.c | 153 +++++++++++++++++++++++++++++++++++++++ hw/s390x/virtio-ccw-md.h | 44 +++++++++++ hw/virtio/Kconfig | 1 + 5 files changed, 201 insertions(+) create mode 100644 hw/s390x/virtio-ccw-md.c create mode 100644 hw/s390x/virtio-ccw-md.h diff --git a/MAINTAINERS b/MAINTAINERS index 0c1bc69828..53ed2c5f0f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2400,6 +2400,8 @@ F: include/hw/virtio/virtio-crypto.h virtio based memory device M: David Hildenbrand S: Supported +F: hw/s390x/virtio-ccw-md.c +F: hw/s390x/virtio-ccw-md.h F: hw/virtio/virtio-md-pci.c F: include/hw/virtio/virtio-md-pci.h F: stubs/virtio-md-pci.c diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build index 71ec747f4c..4df40da855 100644 --- a/hw/s390x/meson.build +++ b/hw/s390x/meson.build @@ -48,6 +48,7 @@ endif virtio_ss.add(when: 'CONFIG_VHOST_SCSI', if_true: files('vhost-scsi-ccw.c')) virtio_ss.add(when: 'CONFIG_VHOST_VSOCK', if_true: files('vhost-vsock-ccw.c')) virtio_ss.add(when: 'CONFIG_VHOST_USER_FS', if_true: files('vhost-user-fs-ccw.c')) +virtio_ss.add(when: 'CONFIG_VIRTIO_MD', if_true: files('virtio-ccw-md.c')) s390x_ss.add_all(when: 'CONFIG_VIRTIO_CCW', if_true: virtio_ss) hw_arch += {'s390x': s390x_ss} diff --git a/hw/s390x/virtio-ccw-md.c b/hw/s390x/virtio-ccw-md.c new file mode 100644 index 0000000000..de333282df --- /dev/null +++ b/hw/s390x/virtio-ccw-md.c @@ -0,0 +1,153 @@ +/* + * Virtio CCW support for abstract virtio based memory device + * + * Copyright (C) 2024 Red Hat, Inc. + * + * Authors: + * David Hildenbrand + * + * This work is licensed under the terms of the GNU GPL, version 2. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "hw/s390x/virtio-ccw-md.h" +#include "hw/mem/memory-device.h" +#include "qapi/error.h" +#include "qemu/error-report.h" + +void virtio_ccw_md_pre_plug(VirtIOMDCcw *vmd, MachineState *ms, Error **errp) +{ + DeviceState *dev = DEVICE(vmd); + HotplugHandler *bus_handler = qdev_get_bus_hotplug_handler(dev); + MemoryDeviceState *md = MEMORY_DEVICE(vmd); + Error *local_err = NULL; + + if (!bus_handler && dev->hotplugged) { + /* + * Without a bus hotplug handler, we cannot control the plug/unplug + * order. We should never reach this point when hotplugging, but + * better add a safety net. + */ + error_setg(errp, "hotplug of virtio based memory devices not supported" + " on this bus."); + return; + } + + /* + * First, see if we can plug this memory device at all. If that + * succeeds, branch of to the actual hotplug handler. + */ + memory_device_pre_plug(md, ms, &local_err); + if (!local_err && bus_handler) { + hotplug_handler_pre_plug(bus_handler, dev, &local_err); + } + error_propagate(errp, local_err); +} + +void virtio_ccw_md_plug(VirtIOMDCcw *vmd, MachineState *ms, Error **errp) +{ + DeviceState *dev = DEVICE(vmd); + HotplugHandler *bus_handler = qdev_get_bus_hotplug_handler(dev); + MemoryDeviceState *md = MEMORY_DEVICE(vmd); + Error *local_err = NULL; + + /* + * Plug the memory device first and then branch off to the actual + * hotplug handler. If that one fails, we can easily undo the memory + * device bits. + */ + memory_device_plug(md, ms); + if (bus_handler) { + hotplug_handler_plug(bus_handler, dev, &local_err); + if (local_err) { + memory_device_unplug(md, ms); + } + } + error_propagate(errp, local_err); +} + +void virtio_ccw_md_unplug_request(VirtIOMDCcw *vmd, MachineState *ms, + Error **errp) +{ + VirtIOMDCcwClass *vmdc = VIRTIO_MD_CCW_GET_CLASS(vmd); + DeviceState *dev = DEVICE(vmd); + HotplugHandler *bus_handler = qdev_get_bus_hotplug_handler(dev); + HotplugHandlerClass *hdc; + Error *local_err = NULL; + + if (!vmdc->unplug_request_check) { + error_setg(errp, + "this virtio based memory devices cannot be unplugged"); + return; + } + + if (!bus_handler) { + error_setg(errp, "hotunplug of virtio based memory devices not" + "supported on this bus"); + return; + } + + vmdc->unplug_request_check(vmd, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* + * Forward the async request or turn it into a sync request (handling it + * like qdev_unplug()). + */ + hdc = HOTPLUG_HANDLER_GET_CLASS(bus_handler); + if (hdc->unplug_request) { + hotplug_handler_unplug_request(bus_handler, dev, &local_err); + } else { + virtio_ccw_md_unplug(vmd, ms, &local_err); + if (!local_err) { + object_unparent(OBJECT(dev)); + } + } +} + +void virtio_ccw_md_unplug(VirtIOMDCcw *vmd, MachineState *ms, Error **errp) +{ + DeviceState *dev = DEVICE(vmd); + HotplugHandler *bus_handler = qdev_get_bus_hotplug_handler(dev); + MemoryDeviceState *md = MEMORY_DEVICE(vmd); + Error *local_err = NULL; + + /* Unplug the memory device while it is still realized. */ + memory_device_unplug(md, ms); + + if (bus_handler) { + hotplug_handler_unplug(bus_handler, dev, &local_err); + if (local_err) { + /* Not expected to fail ... but still try to recover. */ + memory_device_plug(md, ms); + error_propagate(errp, local_err); + return; + } + } else { + /* Very unexpected, but let's just try to do the right thing. */ + warn_report("Unexpected unplug of virtio based memory device"); + qdev_unrealize(dev); + } +} + +static const TypeInfo virtio_ccw_md_info = { + .name = TYPE_VIRTIO_MD_CCW, + .parent = TYPE_VIRTIO_CCW_DEVICE, + .instance_size = sizeof(VirtIOMDCcw), + .class_size = sizeof(VirtIOMDCcwClass), + .abstract = true, + .interfaces = (InterfaceInfo[]) { + { TYPE_MEMORY_DEVICE }, + { } + }, +}; + +static void virtio_ccw_md_register(void) +{ + type_register_static(&virtio_ccw_md_info); +} +type_init(virtio_ccw_md_register) diff --git a/hw/s390x/virtio-ccw-md.h b/hw/s390x/virtio-ccw-md.h new file mode 100644 index 0000000000..e83d40f6c4 --- /dev/null +++ b/hw/s390x/virtio-ccw-md.h @@ -0,0 +1,44 @@ +/* + * Virtio CCW support for abstract virtio based memory device + * + * Copyright (C) 2024 Red Hat, Inc. + * + * Authors: + * David Hildenbrand + * + * This work is licensed under the terms of the GNU GPL, version 2. + * See the COPYING file in the top-level directory. + */ + +#ifndef HW_S390X_VIRTIO_CCW_MD_H +#define HW_S390X_VIRTIO_CCW_MD_H + +#include "virtio-ccw.h" +#include "qom/object.h" + +/* + * virtio-md-ccw: This extends VirtioCcwDevice. + */ +#define TYPE_VIRTIO_MD_CCW "virtio-md-ccw" + +OBJECT_DECLARE_TYPE(VirtIOMDCcw, VirtIOMDCcwClass, VIRTIO_MD_CCW) + +struct VirtIOMDCcwClass { + /* private */ + VirtIOCCWDeviceClass parent; + + /* public */ + void (*unplug_request_check)(VirtIOMDCcw *vmd, Error **errp); +}; + +struct VirtIOMDCcw { + VirtioCcwDevice parent_obj; +}; + +void virtio_ccw_md_pre_plug(VirtIOMDCcw *vmd, MachineState *ms, Error **errp); +void virtio_ccw_md_plug(VirtIOMDCcw *vmd, MachineState *ms, Error **errp); +void virtio_ccw_md_unplug_request(VirtIOMDCcw *vmd, MachineState *ms, + Error **errp); +void virtio_ccw_md_unplug(VirtIOMDCcw *vmd, MachineState *ms, Error **errp); + +#endif diff --git a/hw/virtio/Kconfig b/hw/virtio/Kconfig index 0afec2ae92..f4b14e1a44 100644 --- a/hw/virtio/Kconfig +++ b/hw/virtio/Kconfig @@ -25,6 +25,7 @@ config VIRTIO_MMIO config VIRTIO_CCW bool select VIRTIO + select VIRTIO_MD_SUPPORTED config VIRTIO_BALLOON bool