From patchwork Fri Mar 29 18:37:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Sementsov-Ogievskiy X-Patchwork-Id: 13610927 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 CA626CD1283 for ; Fri, 29 Mar 2024 18:39:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rqH7f-0002oj-KD; Fri, 29 Mar 2024 14:38:39 -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 1rqH7d-0002nM-Eq; Fri, 29 Mar 2024 14:38:37 -0400 Received: from forwardcorp1b.mail.yandex.net ([2a02:6b8:c02:900:1:45:d181:df01]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rqH7Z-0007XL-Aj; Fri, 29 Mar 2024 14:38:37 -0400 Received: from mail-nwsmtp-smtp-corp-main-26.myt.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-26.myt.yp-c.yandex.net [IPv6:2a02:6b8:c12:5428:0:640:7351:0]) by forwardcorp1b.mail.yandex.net (Yandex) with ESMTPS id 9742E608F2; Fri, 29 Mar 2024 21:38:30 +0300 (MSK) Received: from vsementsov-lin.. (unknown [2a02:6b8:b081:6509::1:4]) by mail-nwsmtp-smtp-corp-main-26.myt.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id 2cTaY94Id8c0-2BqLNsDV; Fri, 29 Mar 2024 21:38:29 +0300 Precedence: bulk X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1711737509; bh=YrCNM/esx2ItwVi57BFApSXbvJb7UknYXWMFwczrP7Q=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=p0epRlRHnCIAi0nuXYEdOuirOaw49nYHLoT+RPIndEjpPZBr88JPQliRYmpEw2Qyl HevxrZMnPYjXtoywguWX8WVdze3ePfsCvhgj+HesPOorfHOboDURU1IAmpbF5w+UrY YafUmI7di/fKWg8BHn3zlVc2rs8qP1BQH20uRf/w= Authentication-Results: mail-nwsmtp-smtp-corp-main-26.myt.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org, raphael@enfabrica.net, mst@redhat.com Cc: kwolf@redhat.com, hreitz@redhat.com, pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, armbru@redhat.com, dave@treblig.org, eblake@redhat.com, qemu-devel@nongnu.org, vsementsov@yandex-team.ru, yc-core@yandex-team.ru Subject: [PATCH v3 4/5] qapi: introduce device-sync-config Date: Fri, 29 Mar 2024 21:37:57 +0300 Message-Id: <20240329183758.3360733-5-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240329183758.3360733-1-vsementsov@yandex-team.ru> References: <20240329183758.3360733-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Received-SPF: pass client-ip=2a02:6b8:c02:900:1:45:d181:df01; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, 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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 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 Add command to sync config from vhost-user backend to the device. It may be helpful when VHOST_USER_SLAVE_CONFIG_CHANGE_MSG failed or not triggered interrupt to the guest or just not available (not supported by vhost-user server). Command result is racy if allow it during migration. Let's allow the sync only in RUNNING state. Signed-off-by: Vladimir Sementsov-Ogievskiy --- hw/block/vhost-user-blk.c | 27 ++++++++++++++++------ hw/virtio/virtio-pci.c | 9 ++++++++ include/hw/qdev-core.h | 3 +++ include/sysemu/runstate.h | 1 + qapi/qdev.json | 21 +++++++++++++++++ system/qdev-monitor.c | 47 +++++++++++++++++++++++++++++++++++++++ system/runstate.c | 5 +++++ 7 files changed, 106 insertions(+), 7 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 9e6bbc6950..2f301f380c 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -88,27 +88,39 @@ static void vhost_user_blk_set_config(VirtIODevice *vdev, const uint8_t *config) s->blkcfg.wce = blkcfg->wce; } +static int vhost_user_blk_sync_config(DeviceState *dev, Error **errp) +{ + int ret; + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostUserBlk *s = VHOST_USER_BLK(vdev); + + ret = vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg, + vdev->config_len, errp); + if (ret < 0) { + return ret; + } + + memcpy(vdev->config, &s->blkcfg, vdev->config_len); + virtio_notify_config(vdev); + + return 0; +} + static int vhost_user_blk_handle_config_change(struct vhost_dev *dev) { int ret; - VirtIODevice *vdev = dev->vdev; - VHostUserBlk *s = VHOST_USER_BLK(dev->vdev); Error *local_err = NULL; if (!dev->started) { return 0; } - ret = vhost_dev_get_config(dev, (uint8_t *)&s->blkcfg, - vdev->config_len, &local_err); + ret = vhost_user_blk_sync_config(DEVICE(dev->vdev), &local_err); if (ret < 0) { error_report_err(local_err); return ret; } - memcpy(dev->vdev->config, &s->blkcfg, vdev->config_len); - virtio_notify_config(dev->vdev); - return 0; } @@ -576,6 +588,7 @@ static void vhost_user_blk_class_init(ObjectClass *klass, void *data) device_class_set_props(dc, vhost_user_blk_properties); dc->vmsd = &vmstate_vhost_user_blk; + dc->sync_config = vhost_user_blk_sync_config; set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); vdc->realize = vhost_user_blk_device_realize; vdc->unrealize = vhost_user_blk_device_unrealize; diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index eaaf86402c..92afbae71c 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -2501,6 +2501,14 @@ static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp) vpciklass->parent_dc_realize(qdev, errp); } +static int virtio_pci_sync_config(DeviceState *dev, Error **errp) +{ + VirtIOPCIProxy *proxy = VIRTIO_PCI(dev); + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); + + return qdev_sync_config(DEVICE(vdev), errp); +} + static void virtio_pci_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); @@ -2517,6 +2525,7 @@ static void virtio_pci_class_init(ObjectClass *klass, void *data) device_class_set_parent_realize(dc, virtio_pci_dc_realize, &vpciklass->parent_dc_realize); rc->phases.hold = virtio_pci_bus_reset_hold; + dc->sync_config = virtio_pci_sync_config; } static const TypeInfo virtio_pci_info = { diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 9228e96c87..87135bdcdf 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -95,6 +95,7 @@ typedef void (*DeviceUnrealize)(DeviceState *dev); typedef void (*DeviceReset)(DeviceState *dev); typedef void (*BusRealize)(BusState *bus, Error **errp); typedef void (*BusUnrealize)(BusState *bus); +typedef int (*DeviceSyncConfig)(DeviceState *dev, Error **errp); /** * struct DeviceClass - The base class for all devices. @@ -162,6 +163,7 @@ struct DeviceClass { DeviceReset reset; DeviceRealize realize; DeviceUnrealize unrealize; + DeviceSyncConfig sync_config; /** * @vmsd: device state serialisation description for @@ -546,6 +548,7 @@ bool qdev_hotplug_allowed(DeviceState *dev, Error **errp); */ HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev); void qdev_unplug(DeviceState *dev, Error **errp); +int qdev_sync_config(DeviceState *dev, Error **errp); void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp); void qdev_machine_creation_done(void); diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h index 0117d243c4..296af52322 100644 --- a/include/sysemu/runstate.h +++ b/include/sysemu/runstate.h @@ -5,6 +5,7 @@ #include "qemu/notify.h" bool runstate_check(RunState state); +const char *current_run_state_str(void); void runstate_set(RunState new_state); RunState runstate_get(void); bool runstate_is_running(void); diff --git a/qapi/qdev.json b/qapi/qdev.json index facaa0bc6a..e8be79c3d5 100644 --- a/qapi/qdev.json +++ b/qapi/qdev.json @@ -161,3 +161,24 @@ ## { 'event': 'DEVICE_UNPLUG_GUEST_ERROR', 'data': { '*device': 'str', 'path': 'str' } } + +## +# @device-sync-config: +# +# Synchronize config from backend to the guest. The command notifies +# re-read the device config from the backend and notifies the guest +# to re-read the config. The command may be used to notify the guest +# about block device capcity change. Currently only vhost-user-blk +# device supports this. +# +# @id: the device's ID or QOM path +# +# Features: +# +# @unstable: The command is experimental. +# +# Since: 9.1 +## +{ 'command': 'device-sync-config', + 'features': [ 'unstable' ], + 'data': {'id': 'str'} } diff --git a/system/qdev-monitor.c b/system/qdev-monitor.c index 7e075d91c1..cb35ea0b86 100644 --- a/system/qdev-monitor.c +++ b/system/qdev-monitor.c @@ -23,6 +23,7 @@ #include "monitor/monitor.h" #include "monitor/qdev.h" #include "sysemu/arch_init.h" +#include "sysemu/runstate.h" #include "qapi/error.h" #include "qapi/qapi-commands-qdev.h" #include "qapi/qmp/dispatch.h" @@ -969,6 +970,52 @@ void qmp_device_del(const char *id, Error **errp) } } +int qdev_sync_config(DeviceState *dev, Error **errp) +{ + DeviceClass *dc = DEVICE_GET_CLASS(dev); + + if (!dc->sync_config) { + error_setg(errp, "device-sync-config is not supported for '%s'", + object_get_typename(OBJECT(dev))); + return -ENOTSUP; + } + + return dc->sync_config(dev, errp); +} + +void qmp_device_sync_config(const char *id, Error **errp) +{ + DeviceState *dev; + + /* + * During migration there is a race between syncing`config and + * migrating it, so let's just not allow it. + * + * Moreover, let's not rely on setting up interrupts in paused + * state, which may be a part of migration process. + */ + + if (migration_is_running()) { + error_setg(errp, "Config synchronization is not allowed " + "during migration."); + return; + } + + if (!runstate_is_running()) { + error_setg(errp, "Config synchronization allowed only in '%s' state, " + "current state is '%s'", RunState_str(RUN_STATE_RUNNING), + current_run_state_str()); + return; + } + + dev = find_device_state(id, true, errp); + if (!dev) { + return; + } + + qdev_sync_config(dev, errp); +} + void hmp_device_add(Monitor *mon, const QDict *qdict) { Error *err = NULL; diff --git a/system/runstate.c b/system/runstate.c index d6ab860eca..8fd89172ae 100644 --- a/system/runstate.c +++ b/system/runstate.c @@ -189,6 +189,11 @@ bool runstate_check(RunState state) return current_run_state == state; } +const char *current_run_state_str(void) +{ + return RunState_str(current_run_state); +} + static void runstate_init(void) { const RunStateTransition *p;