From nobody Tue Feb 10 00:22:40 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=oracle.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1544458777426642.4945434059784; Mon, 10 Dec 2018 08:19:37 -0800 (PST) Received: from localhost ([::1]:33558 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gWOHN-0003I5-AR for importer@patchew.org; Mon, 10 Dec 2018 11:19:33 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55424) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gWOED-0001KG-5o for qemu-devel@nongnu.org; Mon, 10 Dec 2018 11:16:18 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gWOE9-0001nG-CB for qemu-devel@nongnu.org; Mon, 10 Dec 2018 11:16:17 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:46172) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gWOE7-0001m4-Bh for qemu-devel@nongnu.org; Mon, 10 Dec 2018 11:16:13 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id wBAGCu8Z005030; Mon, 10 Dec 2018 16:16:08 GMT Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp2130.oracle.com with ESMTP id 2p85ctxwpr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 10 Dec 2018 16:16:08 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id wBAGG7Ov022801 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 10 Dec 2018 16:16:07 GMT Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id wBAGG75L022087; Mon, 10 Dec 2018 16:16:07 GMT Received: from ban25x6uut28.us.oracle.com (/10.153.73.28) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 10 Dec 2018 08:16:07 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=OaRDJtZKn9NN11FtcrNjxSEGyzqXSyu5KgHkBJAtLn8=; b=qe1VDO0iWcKaN+yaQ23/ef6xzH74UTMuaH6MtSoy1T/VSCyefMmKl/aUF5TV0INKvuoj LDNJZ9XKTrs/ZDdRSLCj7RwMAStpeFYOsfbbSSL4QlWFTHL2AwkWpGV+TFDlcVwthUTq SWW+17oa2OLLbMo0wCcPNO0XP4Ilk9Tpjl+yrtA96UmQ5CVy47A0/vbGQzVMHhLJv9m+ 8jyWUNwBhCvgmrwn+QW455+7aQmFJQ9j6EBKq1xkbtwj7xyclXLR5ysUeTWpbguoxK5/ AHomPeyh22Wkd+aZQjqSHxoEoCQfrw7OFkFT7EOfN31AqNQc6nOAlMn9XQ3f76xAbDA+ Zw== From: Venu Busireddy To: venu.busireddy@oracle.com, "Michael S. Tsirkin" , Marcel Apfelbaum Date: Mon, 10 Dec 2018 11:15:47 -0500 Message-Id: <1544458548-5986-3-git-send-email-venu.busireddy@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1544458548-5986-1-git-send-email-venu.busireddy@oracle.com> References: <1544458548-5986-1-git-send-email-venu.busireddy@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9103 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812100146 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.86 Subject: [Qemu-devel] [PATCH 2/3] virtio_net: Add support for "Data Path Switching" during Live Migration. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: virtio-dev@lists.oasis-open.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Added two new events, FAILOVER_PLUG_PRIMARY and FAILOVER_UNPLUG_PRIMARY. The first is emitted when the guest negotiates the F_STANDBY feature bit. The second is emitted when the virtio_net driver is removed, either manually or as a result of guest reboot. Management stack can use these events to determine when to plug/unplug the VF device to/from the guest. Also, the Virtual Functions will be automatically removed from the guest if the guest is rebooted. To properly identify the VFIO devices that must be removed, a new property named "x-failover-primary" is added to the vfio-pci devices. Only the vfio-pci devices that have this property enabled are removed from the guest upon reboot. Signed-off-by: Venu Busireddy --- hw/acpi/pcihp.c | 27 ++++++++++++++++++++++++++ hw/net/virtio-net.c | 23 ++++++++++++++++++++++ hw/vfio/pci.c | 3 +++ hw/vfio/pci.h | 1 + include/hw/pci/pci.h | 1 + include/hw/virtio/virtio-net.h | 4 ++++ qapi/net.json | 44 ++++++++++++++++++++++++++++++++++++++= ++++ 7 files changed, 103 insertions(+) diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c index 80d42e1..2a3ffd3 100644 --- a/hw/acpi/pcihp.c +++ b/hw/acpi/pcihp.c @@ -176,6 +176,25 @@ static void acpi_pcihp_eject_slot(AcpiPciHpState *s, u= nsigned bsel, unsigned slo } } =20 +static void acpi_pcihp_cleanup_failover_primary(AcpiPciHpState *s, int bse= l) +{ + BusChild *kid, *next; + PCIBus *bus =3D acpi_pcihp_find_hotplug_bus(s, bsel); + + if (!bus) { + return; + } + QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) { + DeviceState *qdev =3D kid->child; + PCIDevice *pdev =3D PCI_DEVICE(qdev); + int slot =3D PCI_SLOT(pdev->devfn); + + if (pdev->failover_primary) { + s->acpi_pcihp_pci_status[bsel].down |=3D (1U << slot); + } + } +} + static void acpi_pcihp_update_hotplug_bus(AcpiPciHpState *s, int bsel) { BusChild *kid, *next; @@ -207,6 +226,14 @@ static void acpi_pcihp_update(AcpiPciHpState *s) int i; =20 for (i =3D 0; i < ACPI_PCIHP_MAX_HOTPLUG_BUS; ++i) { + /* + * Set the acpi_pcihp_pci_status[].down bits of all the + * failover_primary devices so that the devices are ejected + * from the guest. We can't use the qdev_unplug() as well as the + * hotplug_handler to unplug the devices, because the guest may + * not be in a state to cooperate. + */ + acpi_pcihp_cleanup_failover_primary(s, i); acpi_pcihp_update_hotplug_bus(s, i); } } diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 411f8fb..d37f33c 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -248,6 +248,28 @@ static void virtio_net_drop_tx_queue_data(VirtIODevice= *vdev, VirtQueue *vq) } } =20 +static void virtio_net_failover_notify_event(VirtIONet *n, uint8_t status) +{ + VirtIODevice *vdev =3D VIRTIO_DEVICE(n); + + if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_STANDBY)) { + gchar *path =3D object_get_canonical_path(OBJECT(n->qdev)); + /* + * Emit the FAILOVER_PLUG_PRIMARY event + * when the status transitions from 0 to VIRTIO_CONFIG_S_DRIVER_= OK + * Emit the FAILOVER_UNPLUG_PRIMARY event + * when the status transitions from VIRTIO_CONFIG_S_DRIVER_OK to= 0 + */ + if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && + (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { + FAILOVER_NOTIFY_EVENT(plug, n, path); + } else if ((!(status & VIRTIO_CONFIG_S_DRIVER_OK)) && + (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { + FAILOVER_NOTIFY_EVENT(unplug, n, path); + } + } +} + static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t statu= s) { VirtIONet *n =3D VIRTIO_NET(vdev); @@ -256,6 +278,7 @@ static void virtio_net_set_status(struct VirtIODevice *= vdev, uint8_t status) uint8_t queue_status; =20 virtio_net_vnet_endian_status(n, status); + virtio_net_failover_notify_event(n, status); virtio_net_vhost_status(n, status); =20 for (i =3D 0; i < n->max_queues; i++) { diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 5c7bd96..ce1f33c 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3077,6 +3077,7 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) vfio_register_err_notifier(vdev); vfio_register_req_notifier(vdev); vfio_setup_resetfn_quirk(vdev); + pdev->failover_primary =3D vdev->failover_primary; =20 return; =20 @@ -3219,6 +3220,8 @@ static Property vfio_pci_dev_properties[] =3D { qdev_prop_nv_gpudirect_clique, uint8_t), DEFINE_PROP_OFF_AUTO_PCIBAR("x-msix-relocation", VFIOPCIDevice, msix_r= elo, OFF_AUTOPCIBAR_OFF), + DEFINE_PROP_BOOL("x-failover-primary", VFIOPCIDevice, + failover_primary, false), /* * TODO - support passed fds... is this necessary? * DEFINE_PROP_STRING("vfiofd", VFIOPCIDevice, vfiofd_name), diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index b1ae4c0..06ca661 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -167,6 +167,7 @@ typedef struct VFIOPCIDevice { bool no_vfio_ioeventfd; bool enable_ramfb; VFIODisplay *dpy; + bool failover_primary; } VFIOPCIDevice; =20 uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len); diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index e6514bb..b0111d1 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -351,6 +351,7 @@ struct PCIDevice { MSIVectorUseNotifier msix_vector_use_notifier; MSIVectorReleaseNotifier msix_vector_release_notifier; MSIVectorPollNotifier msix_vector_poll_notifier; + bool failover_primary; }; =20 void pci_register_bar(PCIDevice *pci_dev, int region_num, diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index 4d7f3c8..a697903 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -22,6 +22,10 @@ #define VIRTIO_NET(obj) \ OBJECT_CHECK(VirtIONet, (obj), TYPE_VIRTIO_NET) =20 +#define FAILOVER_NOTIFY_EVENT(type, n, path) \ + qapi_event_send_failover_##type##_primary \ + (!!n->netclient_name, n->netclient_name, path) + #define TX_TIMER_INTERVAL 150000 /* 150 us */ =20 /* Limit the number of packets that can be sent via a single flush diff --git a/qapi/net.json b/qapi/net.json index 8f99fd9..04a9de9 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -683,3 +683,47 @@ ## { 'event': 'NIC_RX_FILTER_CHANGED', 'data': { '*name': 'str', 'path': 'str' } } + +## +# @FAILOVER_PLUG_PRIMARY: +# +# Emitted when the guest successfully loads the driver after the STANDBY +# feature bit is negotiated. +# +# @device: Indicates the virtio_net device. +# +# @path: Indicates the device path. +# +# Since: 3.0 +# +# Example: +# +# <- {"timestamp": {"seconds": 1432121972, "microseconds": 744001}, +# "event": "FAILOVER_PLUG_PRIMARY", +# "data": {"device": "net0", "path": "/machine/peripheral/net0/virtio-= backend"} } +# +## +{ 'event': 'FAILOVER_PLUG_PRIMARY', + 'data': {'*device': 'str', 'path': 'str'} } + +## +# @FAILOVER_UNPLUG_PRIMARY: +# +# Emitted when the guest resets the virtio_net driver. +# The reset can be the result of either unloading the driver or a reboot. +# +# @device: Indicates the virtio_net device. +# +# @path: Indicates the device path. +# +# Since: 3.0 +# +# Example: +# +# <- {"timestamp": {"seconds": 1432121972, "microseconds": 744001}, +# "event": "FAILOVER_UNPLUG_PRIMARY", +# "data": {"device": "net0", "path": "/machine/peripheral/net0/virtio-= backend"} } +# +## +{ 'event': 'FAILOVER_UNPLUG_PRIMARY', + 'data': {'*device': 'str', 'path': 'str'} }