From patchwork Wed Nov 6 11:18:35 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: 13864401 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 9EC24D44D4F for ; Wed, 6 Nov 2024 11:19:59 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t8e4A-0002gi-0N; Wed, 06 Nov 2024 06:19:14 -0500 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 1t8e46-0002em-LX; Wed, 06 Nov 2024 06:19:10 -0500 Received: from forwardcorp1a.mail.yandex.net ([178.154.239.72]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t8e43-0008FD-97; Wed, 06 Nov 2024 06:19:10 -0500 Received: from mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net [IPv6:2a02:6b8:c0c:94a7:0:640:198e:0]) by forwardcorp1a.mail.yandex.net (Yandex) with ESMTPS id 275DB60CA0; Wed, 6 Nov 2024 14:19:00 +0300 (MSK) Received: from vsementsov-lin.. (unknown [2a02:6b8:b081:b49f::1:6]) by mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id dIfYi50AYGk0-akOMQYq6; Wed, 06 Nov 2024 14:18:59 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1730891939; bh=ebWlvUPvola7RjQFgMDCOYyzuGWnR2oAgbNYXv0Di1g=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=E85lG0Rsah1BsCuT5JU/sMmciC/5LiTY9S0R90uaOBK6ziw4wt5KIJj1evH+v5vOv MgNhT9NgQTX3DqjRlaqWC93wGIYzzc12bV9MLR9zLtGShf5uAZR7uJYc+22PvmUrx8 o5W3NqXpDpuJU7wXndm0IbysJgtbVkr4t1nMN5BI= Authentication-Results: mail-nwsmtp-smtp-corp-main-66.iva.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: sgarzare@redhat.com, kwolf@redhat.com, hreitz@redhat.com, pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, eblake@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org, Vladimir Sementsov-Ogievskiy Subject: [PATCH v7 1/3] qdev-monitor: add option to report GenericError from find_device_state Date: Wed, 6 Nov 2024 14:18:35 +0300 Message-Id: <20241106111837.115820-2-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241106111837.115820-1-vsementsov@yandex-team.ru> References: <20241106111837.115820-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Received-SPF: pass client-ip=178.154.239.72; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1a.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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 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 Here we just prepare for the following patch, making possible to report GenericError as recommended. This patch doesn't aim to prevent further use of DeviceNotFound by future interfaces: - find_device_state() is used in blk_by_qdev_id() and qmp_get_blk() functions, which may lead to spread of DeviceNotFound anyway - also, nothing prevent simply copy-pasting find_device_state() calls with false argument Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Markus Armbruster Acked-by: Raphael Norwitz --- system/qdev-monitor.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/system/qdev-monitor.c b/system/qdev-monitor.c index 320c47b72d..2c76cef4d8 100644 --- a/system/qdev-monitor.c +++ b/system/qdev-monitor.c @@ -885,13 +885,20 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp) object_unref(OBJECT(dev)); } -static DeviceState *find_device_state(const char *id, Error **errp) +/* + * Note that creating new APIs using error classes other than GenericError is + * not recommended. Set use_generic_error=true for new interfaces. + */ +static DeviceState *find_device_state(const char *id, bool use_generic_error, + Error **errp) { Object *obj = object_resolve_path_at(qdev_get_peripheral(), id); DeviceState *dev; if (!obj) { - error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, + error_set(errp, + (use_generic_error ? + ERROR_CLASS_GENERIC_ERROR : ERROR_CLASS_DEVICE_NOT_FOUND), "Device '%s' not found", id); return NULL; } @@ -956,7 +963,7 @@ void qdev_unplug(DeviceState *dev, Error **errp) void qmp_device_del(const char *id, Error **errp) { - DeviceState *dev = find_device_state(id, errp); + DeviceState *dev = find_device_state(id, false, errp); if (dev != NULL) { if (dev->pending_deleted_event && (dev->pending_deleted_expires_ms == 0 || @@ -1076,7 +1083,7 @@ BlockBackend *blk_by_qdev_id(const char *id, Error **errp) GLOBAL_STATE_CODE(); - dev = find_device_state(id, errp); + dev = find_device_state(id, false, errp); if (dev == NULL) { return NULL; } From patchwork Wed Nov 6 11:18:36 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: 13864402 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 65651D44D4C for ; Wed, 6 Nov 2024 11:20:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t8e4A-0002h9-LA; Wed, 06 Nov 2024 06:19:14 -0500 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 1t8e46-0002eq-M3; Wed, 06 Nov 2024 06:19:10 -0500 Received: from forwardcorp1b.mail.yandex.net ([178.154.239.136]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t8e42-0008FW-TN; Wed, 06 Nov 2024 06:19:10 -0500 Received: from mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net [IPv6:2a02:6b8:c0c:94a7:0:640:198e:0]) by forwardcorp1b.mail.yandex.net (Yandex) with ESMTPS id 0DAAC60B25; Wed, 6 Nov 2024 14:19:01 +0300 (MSK) Received: from vsementsov-lin.. (unknown [2a02:6b8:b081:b49f::1:6]) by mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id dIfYi50AYGk0-bpCY0Iee; Wed, 06 Nov 2024 14:19:00 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1730891940; bh=IEOiRJGJYlcr4g0r9xJip2sYo3/kprjCQRJKg3vrrEg=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=P7LBlfC4n+WavmuPTiG9ffnqidyueBYcWsn8WWK7qVlskrcFES4713lWkciG5/DzF GidLSiSmNzja6UOQSp6kxZ7/jYQyBPcJpKs2W7FhqYbxoP66Up7+R/0YpaZnicGTR5 NKIAe2WJlYFmry18wUWyt4fcFvBCyAVn4lOEVNjw= Authentication-Results: mail-nwsmtp-smtp-corp-main-66.iva.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: sgarzare@redhat.com, kwolf@redhat.com, hreitz@redhat.com, pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, eblake@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org, Vladimir Sementsov-Ogievskiy Subject: [PATCH v7 2/3] vhost-user-blk: split vhost_user_blk_sync_config() Date: Wed, 6 Nov 2024 14:18:36 +0300 Message-Id: <20241106111837.115820-3-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241106111837.115820-1-vsementsov@yandex-team.ru> References: <20241106111837.115820-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Received-SPF: pass client-ip=178.154.239.136; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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 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 Split vhost_user_blk_sync_config() out from vhost_user_blk_handle_config_change(), to be reused in the following commit. Signed-off-by: Vladimir Sementsov-Ogievskiy Acked-by: Raphael Norwitz Reviewed-by: Stefano Garzarella --- hw/block/vhost-user-blk.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 5b7f46bbb0..48b3dabb8d 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -90,27 +90,39 @@ 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; } From patchwork Wed Nov 6 11:18:37 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: 13864403 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 B24FBD44D4C for ; Wed, 6 Nov 2024 11:20:33 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t8e4A-0002h7-Jp; Wed, 06 Nov 2024 06:19:14 -0500 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 1t8e46-0002eo-Li; Wed, 06 Nov 2024 06:19:10 -0500 Received: from forwardcorp1a.mail.yandex.net ([2a02:6b8:c0e:500:1:45:d181:df01]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t8e42-0008FO-PD; Wed, 06 Nov 2024 06:19:10 -0500 Received: from mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net [IPv6:2a02:6b8:c0c:94a7:0:640:198e:0]) by forwardcorp1a.mail.yandex.net (Yandex) with ESMTPS id 0F5B760A8E; Wed, 6 Nov 2024 14:19:02 +0300 (MSK) Received: from vsementsov-lin.. (unknown [2a02:6b8:b081:b49f::1:6]) by mail-nwsmtp-smtp-corp-main-66.iva.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id dIfYi50AYGk0-aHSW0wzo; Wed, 06 Nov 2024 14:19:01 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1730891941; bh=kPJONOBuupK35ix70ujuH2B0YF+8dGxRVC385QmotRc=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=LOt2M6bdOSW4ixqALugOxgVJoCWlgbaS9wPlyrCnJVIAg8bo+borDg00puzT6YG9r dwZlv7AnvQLMkOYxk028vvxVvGEskQXahhbkNOGLW1fIBRq+yFQmo3uUdKzy3iWOkA jppfAi23c0CGQxK6AtsiuND61a8QY1GSFavrHITg= Authentication-Results: mail-nwsmtp-smtp-corp-main-66.iva.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: sgarzare@redhat.com, kwolf@redhat.com, hreitz@redhat.com, pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, eblake@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org, Vladimir Sementsov-Ogievskiy Subject: [PATCH v7 3/3] qapi: introduce device-sync-config Date: Wed, 6 Nov 2024 14:18:37 +0300 Message-Id: <20241106111837.115820-4-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241106111837.115820-1-vsementsov@yandex-team.ru> References: <20241106111837.115820-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Received-SPF: pass client-ip=2a02:6b8:c0e:500:1:45:d181:df01; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1a.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, 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 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 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 not allow that. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Markus Armbruster Acked-by: Raphael Norwitz --- hw/block/vhost-user-blk.c | 1 + hw/virtio/virtio-pci.c | 9 +++++++++ include/hw/qdev-core.h | 6 ++++++ qapi/qdev.json | 24 ++++++++++++++++++++++++ system/qdev-monitor.c | 38 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 78 insertions(+) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 48b3dabb8d..7996e49821 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -591,6 +591,7 @@ 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 4d832fe845..c5a809b956 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -2385,6 +2385,14 @@ 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); @@ -2401,6 +2409,7 @@ 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 aa97c34a4b..94914858d8 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. @@ -103,6 +104,9 @@ typedef void (*BusUnrealize)(BusState *bus); * property is changed to %true. * @unrealize: Callback function invoked when the #DeviceState:realized * property is changed to %false. + * @sync_config: Callback function invoked when QMP command device-sync-config + * is called. Should synchronize device configuration from host to guest part + * and notify the guest about the change. * @hotpluggable: indicates if #DeviceClass is hotpluggable, available * as readonly "hotpluggable" property of #DeviceState instance * @@ -162,6 +166,7 @@ struct DeviceClass { DeviceReset legacy_reset; DeviceRealize realize; DeviceUnrealize unrealize; + DeviceSyncConfig sync_config; /** * @vmsd: device state serialisation description for @@ -547,6 +552,7 @@ 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/qapi/qdev.json b/qapi/qdev.json index 53d147c7b4..25cbcf977b 100644 --- a/qapi/qdev.json +++ b/qapi/qdev.json @@ -163,3 +163,27 @@ ## { 'event': 'DEVICE_UNPLUG_GUEST_ERROR', 'data': { '*device': 'str', 'path': 'str' } } + +## +# @device-sync-config: +# +# Synchronize device configuration from host to guest part. First, +# copy the configuration from the host part (backend) to the guest +# part (frontend). Then notify guest software that device +# configuration changed. +# +# 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: 9.2 +## +{ 'command': 'device-sync-config', + 'features': [ 'unstable' ], + 'data': {'id': 'str'} } diff --git a/system/qdev-monitor.c b/system/qdev-monitor.c index 2c76cef4d8..d25325c4e3 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" @@ -977,6 +978,43 @@ 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`configuration + * and migrating it (if migrate first, that target would get + * outdated version), so let's just not allow it. + */ + + if (migration_is_running()) { + error_setg(errp, "Config synchronization is not allowed " + "during migration"); + 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;