This is implementing the host side of the net_failover concept (https://www.kernel.org/doc/html/latest/networking/net_failover.html) Changes since v3: * Patch 1, make return values of qdev_should_hide_device() more clear * Patch 1, clarify comment about new should_be_hidden DeviceListener * Patch 2 new patch, add net_failover_option_id to PCIDevice, only allow PCIExpress devices for now * Patch 8, only go into wait_unplug state when failover devices are present * Patch 8, add new state to migration_is_setup_or_active, tested cancelling while migration is in this state * Patch 8, simplify handling of wait_unplug state, don't cancel migration after timeout, let upper layer do this, get rid of retry counter (dgilbert) * Patch 11, move net_failover_pair_id to PCIDev, move check for pci class to PCI code, only allow PCIe devices for now as we only support hotplugging these devices (aw) * verified qemu make check tests ran, checked that docker-test-quick@centos7 runs successful, tested migration with/without failover, without vfio-pci * this now allows only PCIe devices because that's the only hotplug controller that supports the partial unplug as of now. I'll work on making it discoverable for libvirt or on support for the other hotplug controllers in a follow-on patch set The general idea is that we have a pair of devices, a vfio-pci and a virtio-net device. Before migration the vfio device is unplugged and data flows to the virtio-net device, on the target side another vfio-pci device is plugged in to take over the data-path. In the guest the net_failover module will pair net devices with the same MAC address. * Patch 1 adds the infrastructure to hide the device for the qbus and qdev APIs * Patch 2 adds checks to PCIDevice for only allowing ethernet devices as failover primary and only PCIExpress capable devices * Patch 3 sets a new flag for PCIDevice 'partially_hotplugged' which we use to skip the unrealize code path when doing a unplug of the primary device * Patch 4 sets the pending_deleted_event before triggering the guest unplug request * Patch 5 and 6 add new qmp events, one sends the device id of a device that was just requested to be unplugged from the guest and another one to let libvirt know if VIRTIO_NET_F_STANDBY was negotiated * Patch 7 make sure that we can unplug the vfio-device before migration starts * Patch 8 adds a new migration state that is entered while we wait for devices to be unplugged by guest OS * Patch 9 just adds the new migration state to a check in libqos code * Patch 10 In the second patch the virtio-net uses the API to defer adding the vfio device until the VIRTIO_NET_F_STANDBY feature is acked. It also implements the migration handler to unplug the device from the guest and re-plug in case of migration failure * Patch 11 allows migration for failover vfio-pci devices Previous discussion: RFC v1 https://patchwork.ozlabs.org/cover/989098/ RFC v2 https://www.mail-archive.com/qemu-devel@nongnu.org/msg606906.html v1: https://lists.gnu.org/archive/html/qemu-devel/2019-05/msg03968.html v2: https://www.mail-archive.com/qemu-devel@nongnu.org/msg635214.html v3: https://patchew.org/QEMU/20191011112015.11785-1-jfreimann@redhat.com/ To summarize concerns/feedback from previous discussion: 1.- guest OS can reject or worse _delay_ unplug by any amount of time. Migration might get stuck for unpredictable time with unclear reason. This approach combines two tricky things, hot/unplug and migration. -> We need to let libvirt know what's happening. Add new qmp events and a new migration state. When a primary device is (partially) unplugged (only from guest) we send a qmp event with the device id. When it is unplugged from the guest the DEVICE_DELETED event is sent. Migration will enter the wait-unplug state while waiting for the guest os to unplug all primary devices and then move on with migration. 2. PCI devices are a precious ressource. The primary device should never be added to QEMU if it won't be used by guest instead of hiding it in QEMU. -> We only hotplug the device when the standby feature bit was negotiated. We save the device cmdline options until we need it for qdev_device_add() Hiding a device can be a useful concept to model. For example a pci device in a powered-off slot could be marked as hidden until the slot is powered on (mst). 3. Management layer software should handle this. Open Stack already has components/code to handle unplug/replug VFIO devices and metadata to provide to the guest for detecting which devices should be paired. -> An approach that includes all software from firmware to higher-level management software wasn't tried in the last years. This is an attempt to keep it simple and contained in QEMU as much as possible. One of the problems that stopped management software and libvirt from implementing this idea is that it can't be sure that it's possible to re-plug the primary device. By not freeing the devices resources in QEMU and only asking the guest OS to unplug it is possible to re-plug the device in case of a migration failure. 4. Hotplugging a device and then making it part of a failover setup is not possible -> addressed by extending qdev hotplug functions to check for hidden attribute, so e.g. device_add can be used to plug a device. I have tested this with a mlx5 and igb NIC and was able to migrate the VM. Command line example: qemu-system-x86_64 -enable-kvm -m 3072 -smp 3 \ -machine q35,kernel-irqchip=split -cpu host \ -serial stdio \ -net none \ -qmp unix:/tmp/qmp.socket,server,nowait \ -monitor telnet:127.0.0.1:5555,server,nowait \ -device pcie-root-port,id=root0,multifunction=on,chassis=0,addr=0xa \ -device pcie-root-port,id=root1,bus=pcie.0,chassis=1 \ -device pcie-root-port,id=root2,bus=pcie.0,chassis=2 \ -netdev tap,script=/root/bin/bridge.sh,downscript=no,id=hostnet1,vhost=on \ -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:6f:55:cc,bus=root2,failover=on \ -device vfio-pci,host=5e:00.2,id=hostdev0,bus=root1,net_failover_pair_id =net1 \ /root/rhel-guest-image-8.0-1781.x86_64.qcow2 I'm grateful for any remarks or ideas! Thanks! regards, Jens Jens Freimann (10): qdev/qbus: add hidden device support pci: mark devices partially unplugged pci: mark device having guest unplug request pending qapi: add unplug primary event qapi: add failover negotiated event migration: allow unplug during migration for failover devices migration: add new migration state wait-unplug libqos: tolerate wait-unplug migration state net/virtio: add failover support vfio: unplug failover primary device before migration hw/core/qdev.c | 20 +++ hw/net/virtio-net.c | 267 +++++++++++++++++++++++++++++++++ hw/pci/pci.c | 2 + hw/pci/pcie.c | 6 + hw/vfio/pci.c | 35 ++++- hw/vfio/pci.h | 2 + include/hw/pci/pci.h | 1 + include/hw/qdev-core.h | 10 ++ include/hw/virtio/virtio-net.h | 12 ++ include/hw/virtio/virtio.h | 1 + include/migration/vmstate.h | 2 + migration/migration.c | 34 +++++ migration/migration.h | 3 + migration/savevm.c | 36 +++++ migration/savevm.h | 1 + qapi/migration.json | 24 ++- qapi/net.json | 16 ++ qdev-monitor.c | 43 +++++- tests/libqos/libqos.c | 3 +- vl.c | 6 +- 20 files changed, 515 insertions(+), 9 deletions(-) -- 2.21.0 *** BLURB HERE *** Jens Freimann (11): qdev/qbus: add hidden device support pci: add option for net failover pci: mark devices partially unplugged pci: mark device having guest unplug request pending qapi: add unplug primary event qapi: add failover negotiated event migration: allow unplug during migration for failover devices migration: add new migration state wait-unplug libqos: tolerate wait-unplug migration state net/virtio: add failover support vfio: unplug failover primary device before migration hw/core/qdev.c | 24 +++ hw/net/virtio-net.c | 282 +++++++++++++++++++++++++++++++++ hw/pci/pci.c | 17 ++ hw/pci/pcie.c | 6 + hw/vfio/pci.c | 26 ++- hw/vfio/pci.h | 1 + include/hw/pci/pci.h | 4 + include/hw/qdev-core.h | 9 ++ include/hw/virtio/virtio-net.h | 12 ++ include/hw/virtio/virtio.h | 1 + include/migration/vmstate.h | 2 + migration/migration.c | 22 +++ migration/migration.h | 3 + migration/savevm.c | 36 +++++ migration/savevm.h | 1 + qapi/migration.json | 24 ++- qapi/net.json | 16 ++ qdev-monitor.c | 38 ++++- tests/libqos/libqos.c | 3 +- vl.c | 6 +- 20 files changed, 519 insertions(+), 14 deletions(-) -- 2.21.0 Jens Freimann (11): qdev/qbus: add hidden device support pci: add option for net failover pci: mark devices partially unplugged pci: mark device having guest unplug request pending qapi: add unplug primary event qapi: add failover negotiated event migration: allow unplug during migration for failover devices migration: add new migration state wait-unplug libqos: tolerate wait-unplug migration state net/virtio: add failover support vfio: unplug failover primary device before migration hw/core/qdev.c | 24 +++ hw/net/virtio-net.c | 282 +++++++++++++++++++++++++++++++++ hw/pci/pci.c | 17 ++ hw/pci/pcie.c | 6 + hw/vfio/pci.c | 26 ++- hw/vfio/pci.h | 1 + include/hw/pci/pci.h | 4 + include/hw/qdev-core.h | 9 ++ include/hw/virtio/virtio-net.h | 12 ++ include/hw/virtio/virtio.h | 1 + include/migration/vmstate.h | 2 + migration/migration.c | 21 +++ migration/migration.h | 3 + migration/savevm.c | 36 +++++ migration/savevm.h | 2 + qapi/migration.json | 24 ++- qapi/net.json | 16 ++ qdev-monitor.c | 38 ++++- tests/libqos/libqos.c | 3 +- vl.c | 6 +- 20 files changed, 519 insertions(+), 14 deletions(-) -- 2.21.0 Jens Freimann (11): qdev/qbus: add hidden device support pci: add option for net failover pci: mark devices partially unplugged pci: mark device having guest unplug request pending qapi: add unplug primary event qapi: add failover negotiated event migration: allow unplug during migration for failover devices migration: add new migration state wait-unplug libqos: tolerate wait-unplug migration state net/virtio: add failover support vfio: unplug failover primary device before migration hw/core/qdev.c | 24 +++ hw/net/virtio-net.c | 282 +++++++++++++++++++++++++++++++++ hw/pci/pci.c | 17 ++ hw/pci/pcie.c | 6 + hw/vfio/pci.c | 31 +++- hw/vfio/pci.h | 1 + include/hw/pci/pci.h | 4 + include/hw/qdev-core.h | 9 ++ include/hw/virtio/virtio-net.h | 12 ++ include/hw/virtio/virtio.h | 1 + include/migration/vmstate.h | 2 + migration/migration.c | 21 +++ migration/migration.h | 3 + migration/savevm.c | 36 +++++ migration/savevm.h | 2 + qapi/migration.json | 24 ++- qapi/net.json | 16 ++ qdev-monitor.c | 38 ++++- tests/libqos/libqos.c | 3 +- vl.c | 6 +- 20 files changed, 524 insertions(+), 14 deletions(-) -- 2.21.0
Copy & paste the following snippet into your terminal to import this patchset into git:
curl -s https://lists.sr.ht/~philmd/qemu/patches/8799/mbox | git am -3Learn more about email & git
This adds support for hiding a device to the qbus and qdev APIs. The first user of this will be the virtio-net failover feature but the API introduced with this patch could be used to implement other features as well, for example hiding pci devices when a pci bus is powered off. qdev_device_add() is modified to check for a net_failover_pair_id argument in the option string. A DeviceListener callback should_be_hidden() is added. It can be used by a standby device to inform qdev that this device should not be added now. The standby device handler can store the device options to plug the device in at a later point in time. One reason for hiding the device is that we don't want to expose both devices to the guest kernel until the respective virtio feature bit VIRTIO_NET_F_STANDBY was negotiated and we know that the devices will be handled correctly by the guest. More information on the kernel feature this is using: https://www.kernel.org/doc/html/latest/networking/net_failover.html An example where the primary device is a vfio-pci device and the standby device is a virtio-net device: A device is hidden when it has an "net_failover_pair_id" option, e.g. -device virtio-net-pci,...,failover=on,... -device vfio-pci,...,net_failover_pair_id=net1,... Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- hw/core/qdev.c | 23 +++++++++++++++++++++++ include/hw/qdev-core.h | 8 ++++++++ qdev-monitor.c | 36 +++++++++++++++++++++++++++++++++--- vl.c | 6 ++++-- 4 files changed, 68 insertions(+), 5 deletions(-) diff --git a/hw/core/qdev.c b/hw/core/qdev.c index cbad6c1d55..89c134ec53 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -212,6 +212,29 @@ void device_listener_unregister(DeviceListener *listener) QTAILQ_REMOVE(&device_listeners, listener, link); } +bool qdev_should_hide_device(QemuOpts *opts) +{ + int rc; + DeviceListener *listener; + + QTAILQ_FOREACH(listener, &device_listeners, link) { + if (listener->should_be_hidden) { + /* should_be_hidden_will return + * 1 if device matches opts and it should be hidden + * 0 if device matches opts and should not be hidden + * -1 if device doesn't match ops + */ + rc = listener->should_be_hidden(listener, opts); + } + + if (rc > 0) { + break; + } + } + + return rc > 0; +} + void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, int required_for_version) { diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index aa123f88cb..28f594a47d 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -154,6 +154,12 @@ struct DeviceState { struct DeviceListener { void (*realize)(DeviceListener *listener, DeviceState *dev); void (*unrealize)(DeviceListener *listener, DeviceState *dev); + /* + * This callback is called upon init of the DeviceState and allows to + * inform qdev that a device should be hidden, depending on the device + * opts, for example, to hide a standby device. + */ + int (*should_be_hidden)(DeviceListener *listener, QemuOpts *device_opts); QTAILQ_ENTRY(DeviceListener) link; }; @@ -451,4 +457,6 @@ static inline bool qbus_is_hotpluggable(BusState *bus) void device_listener_register(DeviceListener *listener); void device_listener_unregister(DeviceListener *listener); +bool qdev_should_hide_device(QemuOpts *opts); + #endif diff --git a/qdev-monitor.c b/qdev-monitor.c index 148df9cacf..508d85df87 100644 --- a/qdev-monitor.c +++ b/qdev-monitor.c @@ -32,9 +32,11 @@ #include "qemu/help_option.h" #include "qemu/option.h" #include "qemu/qemu-print.h" +#include "qemu/option_int.h" #include "sysemu/block-backend.h" #include "sysemu/sysemu.h" #include "migration/misc.h" +#include "migration/migration.h" /* * Aliases were a bad idea from the start. Let's keep them @@ -562,14 +564,40 @@ void qdev_set_id(DeviceState *dev, const char *id) } } +static int is_failover_device(void *opaque, const char *name, const char *value, + Error **errp) +{ + if (strcmp(name, "net_failover_pair_id") == 0) { + QemuOpts *opts = (QemuOpts *)opaque; + + if (qdev_should_hide_device(opts)) { + return 1; + } + } + + return 0; +} + +static bool should_hide_device(QemuOpts *opts) +{ + if (qemu_opt_foreach(opts, is_failover_device, opts, NULL) == 0) { + return false; + } + return true; +} + DeviceState *qdev_device_add(QemuOpts *opts, Error **errp) { DeviceClass *dc; const char *driver, *path; - DeviceState *dev; + DeviceState *dev = NULL; BusState *bus = NULL; Error *err = NULL; + if (opts && should_hide_device(opts)) { + return NULL; + } + driver = qemu_opt_get(opts, "driver"); if (!driver) { error_setg(errp, QERR_MISSING_PARAMETER, "driver"); @@ -648,8 +676,10 @@ DeviceState *qdev_device_add(QemuOpts *opts, Error **errp) err_del_dev: error_propagate(errp, err); - object_unparent(OBJECT(dev)); - object_unref(OBJECT(dev)); + if (dev) { + object_unparent(OBJECT(dev)); + object_unref(OBJECT(dev)); + } return NULL; } diff --git a/vl.c b/vl.c index 4489cfb2bb..62c388cb49 100644 --- a/vl.c +++ b/vl.c @@ -2204,10 +2204,12 @@ static int device_init_func(void *opaque, QemuOpts *opts, Error **errp) DeviceState *dev; dev = qdev_device_add(opts, errp); - if (!dev) { + if (!dev && *errp) { + error_report_err(*errp); return -1; + } else if (dev) { + object_unref(OBJECT(dev)); } - object_unref(OBJECT(dev)); return 0; } -- 2.21.0
This patch adds a net_failover_pair_id property to PCIDev which is used to link the primary device in a failover pair (the PCI dev) to a standby (a virtio-net-pci) device. It only supports ethernet devices. Also currently it only supports PCIe devices. QEMU will exit with an error message otherwise. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- hw/pci/pci.c | 17 +++++++++++++++++ include/hw/pci/pci.h | 3 +++ 2 files changed, 20 insertions(+) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index aa05c2b9b2..fa9b5219f8 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -75,6 +75,8 @@ static Property pci_props[] = { QEMU_PCIE_LNKSTA_DLLLA_BITNR, true), DEFINE_PROP_BIT("x-pcie-extcap-init", PCIDevice, cap_present, QEMU_PCIE_EXTCAP_INIT_BITNR, true), + DEFINE_PROP_STRING("net_failover_pair_id", PCIDevice, + net_failover_pair_id), DEFINE_PROP_END_OF_LIST() }; @@ -2077,6 +2079,7 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp) ObjectClass *klass = OBJECT_CLASS(pc); Error *local_err = NULL; bool is_default_rom; + uint16_t class_id; /* initialize cap_present for pci_is_express() and pci_config_size(), * Note that hybrid PCIs are not set automatically and need to manage @@ -2101,6 +2104,20 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp) } } + if (pci_dev->net_failover_pair_id) { + if (!pci_is_express(pci_dev)) { + error_setg(errp, "failover device is not a PCIExpress device"); + error_propagate(errp, local_err); + return; + } + class_id = pci_get_word(pci_dev->config + PCI_CLASS_DEVICE); + if (class_id != PCI_CLASS_NETWORK_ETHERNET) { + error_setg(errp, "failover device is not an Ethernet device"); + error_propagate(errp, local_err); + return; + } + } + /* rom loading */ is_default_rom = false; if (pci_dev->romfile == NULL && pc->romfile != NULL) { diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index f3f0ffd5fb..def5435685 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -352,6 +352,9 @@ struct PCIDevice { MSIVectorUseNotifier msix_vector_use_notifier; MSIVectorReleaseNotifier msix_vector_release_notifier; MSIVectorPollNotifier msix_vector_poll_notifier; + + /* ID of standby device in net_failover pair */ + char *net_failover_pair_id; }; void pci_register_bar(PCIDevice *pci_dev, int region_num, -- 2.21.0
Only the guest unplug request was triggered. This is needed for the failover feature. In case of a failed migration we need to plug the device back to the guest. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- hw/pci/pcie.c | 3 +++ include/hw/pci/pci.h | 1 + 2 files changed, 4 insertions(+) diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c index a6beb567bd..19363ff8ce 100644 --- a/hw/pci/pcie.c +++ b/hw/pci/pcie.c @@ -456,6 +456,9 @@ static void pcie_unplug_device(PCIBus *bus, PCIDevice *dev, void *opaque) { HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(dev)); + if (dev->partially_hotplugged) { + return; + } hotplug_handler_unplug(hotplug_ctrl, DEVICE(dev), &error_abort); object_unparent(OBJECT(dev)); } diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index def5435685..7b7eac845c 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -265,6 +265,7 @@ typedef struct PCIReqIDCache PCIReqIDCache; struct PCIDevice { DeviceState qdev; + bool partially_hotplugged; /* PCI config space */ uint8_t *config; -- 2.21.0
Set pending_deleted_event in DeviceState for failover primary devices that were successfully unplugged by the Guest OS. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- hw/pci/pcie.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c index 19363ff8ce..08718188bb 100644 --- a/hw/pci/pcie.c +++ b/hw/pci/pcie.c @@ -457,6 +457,7 @@ static void pcie_unplug_device(PCIBus *bus, PCIDevice *dev, void *opaque) HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(dev)); if (dev->partially_hotplugged) { + dev->qdev.pending_deleted_event = false; return; } hotplug_handler_unplug(hotplug_ctrl, DEVICE(dev), &error_abort); @@ -476,6 +477,8 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev, return; } + dev->pending_deleted_event = true; + /* In case user cancel the operation of multi-function hot-add, * remove the function that is unexposed to guest individually, * without interaction with guest. -- 2.21.0
This event is emitted when we sent a request to unplug a failover primary device from the Guest OS and it includes the device id of the primary device. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- qapi/migration.json | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/qapi/migration.json b/qapi/migration.json index 82feb5bd39..52e69e2868 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -1448,3 +1448,22 @@ # Since: 3.0 ## { 'command': 'migrate-pause', 'allow-oob': true } + +## +# @UNPLUG_PRIMARY: +# +# Emitted from source side of a migration when migration state is +# WAIT_UNPLUG. Device was unplugged by guest operating system. +# Device resources in QEMU are kept on standby to be able to re-plug it in case +# of migration failure. +# +# @device_id: QEMU device id of the unplugged device +# +# Since: 4.2 +# +# Example: +# {"event": "UNPLUG_PRIMARY", "data": {"device_id": "hostdev0"} }
Eric Blake <eblake@redhat.com>Unless there is a strong reason in favor of 'device_id' (such as consistency with a similar event), our naming convention prefers this to be 'device-id'.
+# +## +{ 'event': 'UNPLUG_PRIMARY', + 'data': { 'device_id': 'str' } } -- 2.21.0
This event is sent to let libvirt know that VIRTIO_NET_F_STANDBY feature was not negotiated during virtio feature negotiation. If this event is received it means any primary devices hotplugged before this were were never really added to QEMU devices. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- qapi/net.json | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/qapi/net.json b/qapi/net.json index 728990f4fb..8c5f3f1fb2 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -737,3 +737,19 @@ ## { 'command': 'announce-self', 'boxed': true, 'data' : 'AnnounceParameters'} + +## +# @FAILOVER_NEGOTIATED: +# +# Emitted when VIRTIO_NET_F_STANDBY was negotiated during feature negotiation +# +# Since: 4.2 +# +# Example: +# +# <- { "event": "FAILOVER_NEGOTIATED", +# "data": {} } +# +## +{ 'event': 'FAILOVER_NEGOTIATED', + 'data': {} } -- 2.21.0
In "b06424de62 migration: Disable hotplug/unplug during migration" we added a check to disable unplug for all devices until we have figured out what works. For failover primary devices qdev_unplug() is called from the migration handler, i.e. during migration. This patch adds a flag to DeviceState which is set to false for all devices and makes an exception for vfio-pci devices that are also primary devices in a failover pair. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- hw/core/qdev.c | 1 + include/hw/qdev-core.h | 1 + qdev-monitor.c | 2 +- 3 files changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 89c134ec53..b1be568af3 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -995,6 +995,7 @@ static void device_initfn(Object *obj) dev->instance_id_alias = -1; dev->realized = false; + dev->allow_unplug_during_migration = false; object_property_add_bool(obj, "realized", device_get_realized, device_set_realized, NULL); diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 28f594a47d..6b690e85b1 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -143,6 +143,7 @@ struct DeviceState { bool pending_deleted_event; QemuOpts *opts; int hotplugged; + bool allow_unplug_during_migration; BusState *parent_bus; QLIST_HEAD(, NamedGPIOList) gpios; QLIST_HEAD(, BusState) child_bus; diff --git a/qdev-monitor.c b/qdev-monitor.c index 508d85df87..265ab4f0d5 100644 --- a/qdev-monitor.c +++ b/qdev-monitor.c @@ -848,7 +848,7 @@ void qdev_unplug(DeviceState *dev, Error **errp) return; } - if (!migration_is_idle()) { + if (!migration_is_idle() && !dev->allow_unplug_during_migration) { error_setg(errp, "device_del not allowed while migrating"); return; } -- 2.21.0
This patch adds a new migration state called wait-unplug. It is entered after the SETUP state if failover devices are present. It will transition into ACTIVE once all devices were succesfully unplugged from the guest. So if a guest doesn't respond or takes long to honor the unplug request the user will see the migration state 'wait-unplug'. In the migration thread we query failover devices if they're are still pending the guest unplug. When all are unplugged the migration continues. If one device won't unplug migration will stay in wait_unplug state. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- include/migration/vmstate.h | 2 ++ migration/migration.c | 21 +++++++++++++++++++++ migration/migration.h | 3 +++ migration/savevm.c | 36 ++++++++++++++++++++++++++++++++++++ migration/savevm.h | 2 ++ qapi/migration.json | 5 ++++- 6 files changed, 68 insertions(+), 1 deletion(-) diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h index b9ee563aa4..ac4f46a67d 100644 --- a/include/migration/vmstate.h +++ b/include/migration/vmstate.h @@ -186,6 +186,8 @@ struct VMStateDescription { int (*pre_save)(void *opaque); int (*post_save)(void *opaque); bool (*needed)(void *opaque); + bool (*dev_unplug_pending)(void *opaque); + const VMStateField *fields; const VMStateDescription **subsections; }; diff --git a/migration/migration.c b/migration/migration.c index 3febd0f8f3..51764f2565 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -52,6 +52,7 @@ #include "hw/qdev-properties.h" #include "monitor/monitor.h" #include "net/announce.h" +#include "qemu/queue.h" #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ @@ -819,6 +820,7 @@ bool migration_is_setup_or_active(int state) case MIGRATION_STATUS_SETUP: case MIGRATION_STATUS_PRE_SWITCHOVER: case MIGRATION_STATUS_DEVICE: + case MIGRATION_STATUS_WAIT_UNPLUG: return true; default: @@ -954,6 +956,9 @@ static void fill_source_migration_info(MigrationInfo *info) case MIGRATION_STATUS_CANCELLED: info->has_status = true; break; + case MIGRATION_STATUS_WAIT_UNPLUG: + info->has_status = true; + break; } info->status = s->state; } @@ -1694,6 +1699,7 @@ bool migration_is_idle(void) case MIGRATION_STATUS_COLO: case MIGRATION_STATUS_PRE_SWITCHOVER: case MIGRATION_STATUS_DEVICE: + case MIGRATION_STATUS_WAIT_UNPLUG: return false; case MIGRATION_STATUS__MAX: g_assert_not_reached(); @@ -3264,6 +3270,19 @@ static void *migration_thread(void *opaque) qemu_savevm_state_setup(s->to_dst_file); + if (qemu_savevm_nr_failover_devices()) { + migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, + MIGRATION_STATUS_WAIT_UNPLUG); + + while (s->state == MIGRATION_STATUS_WAIT_UNPLUG && + !qemu_savevm_state_guest_unplug_pending()) { + qemu_sem_timedwait(&s->wait_unplug_sem, 250); + } + + migrate_set_state(&s->state, MIGRATION_STATUS_WAIT_UNPLUG, + MIGRATION_STATUS_ACTIVE); + } + s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE); @@ -3511,6 +3530,7 @@ static void migration_instance_finalize(Object *obj) qemu_mutex_destroy(&ms->qemu_file_lock); g_free(params->tls_hostname); g_free(params->tls_creds); + qemu_sem_destroy(&ms->wait_unplug_sem); qemu_sem_destroy(&ms->rate_limit_sem); qemu_sem_destroy(&ms->pause_sem); qemu_sem_destroy(&ms->postcopy_pause_sem); @@ -3556,6 +3576,7 @@ static void migration_instance_init(Object *obj) qemu_sem_init(&ms->postcopy_pause_rp_sem, 0); qemu_sem_init(&ms->rp_state.rp_sem, 0); qemu_sem_init(&ms->rate_limit_sem, 0); + qemu_sem_init(&ms->wait_unplug_sem, 0); qemu_mutex_init(&ms->qemu_file_lock); } diff --git a/migration/migration.h b/migration/migration.h index 4f2fe193dc..79b3dda146 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -206,6 +206,9 @@ struct MigrationState /* Flag set once the migration thread called bdrv_inactivate_all */ bool block_inactive; + /* Migration is waiting for guest to unplug device */ + QemuSemaphore wait_unplug_sem; + /* Migration is paused due to pause-before-switchover */ QemuSemaphore pause_sem; diff --git a/migration/savevm.c b/migration/savevm.c index 8d95e261f6..0f18dea49e 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1113,6 +1113,42 @@ void qemu_savevm_state_header(QEMUFile *f) } } +int qemu_savevm_nr_failover_devices(void) +{ + SaveStateEntry *se; + int n = 0; + + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (se->vmsd && se->vmsd->dev_unplug_pending) { + n++; + } + } + + return n; +} + +bool qemu_savevm_state_guest_unplug_pending(void) +{ + int nr_failover_devs; + SaveStateEntry *se; + bool ret = false; + int n = 0; + + nr_failover_devs = qemu_savevm_nr_failover_devices(); + + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->vmsd || !se->vmsd->dev_unplug_pending) { + continue; + } + ret = se->vmsd->dev_unplug_pending(se->opaque); + if (!ret) { + n++; + } + } + + return n == nr_failover_devs; +} + void qemu_savevm_state_setup(QEMUFile *f) { SaveStateEntry *se; diff --git a/migration/savevm.h b/migration/savevm.h index 51a4b9caa8..c42b9c80ee 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -31,6 +31,8 @@ bool qemu_savevm_state_blocked(Error **errp); void qemu_savevm_state_setup(QEMUFile *f); +int qemu_savevm_nr_failover_devices(void); +bool qemu_savevm_state_guest_unplug_pending(void); int qemu_savevm_state_resume_prepare(MigrationState *s); void qemu_savevm_state_header(QEMUFile *f); int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy); diff --git a/qapi/migration.json b/qapi/migration.json index 52e69e2868..5a06cd489f 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -133,6 +133,9 @@ # @device: During device serialisation when pause-before-switchover is enabled # (since 2.11) # +# @wait-unplug: wait for device unplug request by guest OS to be completed. +# (since 4.2) +# # Since: 2.3 # ## @@ -140,7 +143,7 @@ 'data': [ 'none', 'setup', 'cancelling', 'cancelled', 'active', 'postcopy-active', 'postcopy-paused', 'postcopy-recover', 'completed', 'failed', 'colo', - 'pre-switchover', 'device' ] } + 'pre-switchover', 'device', 'wait-unplug' ] } ## # @MigrationInfo: -- 2.21.0
Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- tests/libqos/libqos.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tests/libqos/libqos.c b/tests/libqos/libqos.c index d71557c5cb..f229eb2cb8 100644 --- a/tests/libqos/libqos.c +++ b/tests/libqos/libqos.c @@ -125,7 +125,8 @@ void migrate(QOSState *from, QOSState *to, const char *uri) break; } - if ((strcmp(st, "setup") == 0) || (strcmp(st, "active") == 0)) { + if ((strcmp(st, "setup") == 0) || (strcmp(st, "active") == 0) + || (strcmp(st, "wait-unplug") == 0)) { qobject_unref(rsp); g_usleep(5000); continue; -- 2.21.0
This patch adds support to handle failover device pairs of a virtio-net
device and a vfio-pci device, where the virtio-net acts as the standby
device and the vfio-pci device as the primary.
The general idea is that we have a pair of devices, a vfio-pci and a
emulated (virtio-net) device. Before migration the vfio device is
unplugged and data flows to the emulated device, on the target side
another vfio-pci device is plugged in to take over the data-path. In the
guest the net_failover module will pair net devices with the same MAC
address.
To achieve this we need:
1. Provide a callback function for the should_be_hidden DeviceListener.
It is called when the primary device is plugged in. Evaluate the QOpt
passed in to check if it is the matching primary device. It returns
two values:
- one to signal if the device to be added is the matching
primary device
- another one to signal to qdev if it should actually
continue with adding the device or skip it.
In the latter case it stores the device options in the VirtioNet
struct and the device is added once the VIRTIO_NET_F_STANDBY feature is
negotiated during virtio feature negotiation.
If the virtio-net devices are not realized at the time the vfio-pci
devices are realized, we need to connect the devices later. This way
we make sure primary and standby devices can be specified in any
order.
2. Register a callback for migration status notifier. When called it
will unplug its primary device before the migration happens.
3. Register a callback for the migration code that checks if a device
needs to be unplugged from the guest.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
hw/net/virtio-net.c | 282 +++++++++++++++++++++++++++++++++
include/hw/virtio/virtio-net.h | 12 ++
include/hw/virtio/virtio.h | 1 +
3 files changed, 295 insertions(+)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 9f11422337..afe113f083 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -12,6 +12,7 @@
*/
#include "qemu/osdep.h"
+#include "qemu/atomic.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
@@ -21,6 +22,10 @@
#include "net/tap.h"
#include "qemu/error-report.h"
#include "qemu/timer.h"
+#include "qemu/option.h"
+#include "qemu/option_int.h"
+#include "qemu/config-file.h"
+#include "qapi/qmp/qdict.h"
#include "hw/virtio/virtio-net.h"
#include "net/vhost_net.h"
#include "net/announce.h"
@@ -28,11 +33,15 @@
#include "qapi/error.h"
#include "qapi/qapi-events-net.h"
#include "hw/qdev-properties.h"
+#include "qapi/qapi-types-migration.h"
+#include "qapi/qapi-events-migration.h"
#include "hw/virtio/virtio-access.h"
#include "migration/misc.h"
#include "standard-headers/linux/ethtool.h"
#include "sysemu/sysemu.h"
#include "trace.h"
+#include "monitor/qdev.h"
+#include "hw/pci/pci.h"
#define VIRTIO_NET_VM_VERSION 11
@@ -746,9 +755,85 @@ static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
return virtio_net_guest_offloads_by_features(vdev->guest_features);
}
+static void failover_add_primary(VirtIONet *n)
+{
+ Error *err = NULL;
+
+ n->primary_device_opts = qemu_opts_find(qemu_find_opts("device"),
+ n->primary_device_id);
+ if (n->primary_device_opts) {
+ n->primary_dev = qdev_device_add(n->primary_device_opts, &err);
+ if (err) {
+ qemu_opts_del(n->primary_device_opts);
+ }
+ if (n->primary_dev) {
+ n->primary_bus = n->primary_dev->parent_bus;
+ if (err) {
+ qdev_unplug(n->primary_dev, &err);
+ qdev_set_id(n->primary_dev, "");
+
+ }
+ }
+ }
+ if (err) {
+ error_report_err(err);
+ }
+}
+
+static int is_my_primary(void *opaque, QemuOpts *opts, Error **errp)
+{
+ VirtIONet *n = opaque;
+ int ret = 0;
+
+ const char *standby_id = qemu_opt_get(opts, "net_failover_pair_id");
+
+ if (standby_id != NULL && (g_strcmp0(standby_id, n->netclient_name) == 0)) {
+ n->primary_device_id = g_strdup(opts->id);
+ ret = 1;
+ }
+
+ return ret;
+}
+
+static DeviceState *virtio_net_find_primary(VirtIONet *n, Error *err)
+{
+ DeviceState *dev = NULL;
+
+ if (qemu_opts_foreach(qemu_find_opts("device"),
+ is_my_primary, n, &err)) {
+ if (n->primary_device_id) {
+ dev = qdev_find_recursive(sysbus_get_default(),
+ n->primary_device_id);
+ } else {
+ return NULL;
+ }
+ }
+ return dev;
+}
+
+
+
+static DeviceState *virtio_connect_failover_devices(VirtIONet *n,
+ DeviceState *dev,
+ Error **errp)
+{
+ DeviceState *prim_dev = NULL;
+
+ prim_dev = virtio_net_find_primary(n, *errp);
+ if (prim_dev) {
+ n->primary_device_id = g_strdup(prim_dev->id);
+ n->primary_device_opts = prim_dev->opts;
+ } else {
+ error_setg(errp, "connect: virtio_net: Could not find primary device");
+ }
+
+ return prim_dev;
+}
+
static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
{
VirtIONet *n = VIRTIO_NET(vdev);
+ Error *err = NULL;
int i;
if (n->mtu_bypass_backend &&
@@ -790,6 +875,22 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
} else {
memset(n->vlans, 0xff, MAX_VLAN >> 3);
}
+
+ if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) {
+ atomic_set(&n->primary_should_be_hidden, false);
+ failover_add_primary(n);
+ if (!n->primary_dev) {
+ n->primary_dev = virtio_connect_failover_devices(n, n->qdev, &err);
+ if (!n->primary_dev) {
+ failover_add_primary(n);
+ n->primary_dev = virtio_connect_failover_devices(n, n->qdev,
+ &err);
+ }
+ }
+ }
+ if (err) {
+ error_report_err(err);
+ }
}
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
@@ -2630,6 +2731,150 @@ void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
n->netclient_type = g_strdup(type);
}
+static bool failover_unplug_primary(VirtIONet *n)
+{
+ HotplugHandler *hotplug_ctrl;
+ PCIDevice *pci_dev;
+ Error *err = NULL;
+
+ hotplug_ctrl = qdev_get_hotplug_handler(n->primary_dev);
+ if (hotplug_ctrl) {
+ pci_dev = PCI_DEVICE(n->primary_dev);
+ pci_dev->partially_hotplugged = true;
+ hotplug_handler_unplug_request(hotplug_ctrl, n->primary_dev, &err);
+ if (err) {
+ error_report_err(err);
+ return false;
+ }
+ } else {
+ return false;
+ }
+ return true;
+}
+
+static bool failover_replug_primary(VirtIONet *n, Error **errp)
+{
+ HotplugHandler *hotplug_ctrl;
+ PCIDevice *pdev = PCI_DEVICE(n->primary_dev);
+
+ if (!pdev->partially_hotplugged) {
+ return true;
+ }
+ if (!n->primary_device_opts) {
+ n->primary_device_opts = qemu_opts_from_qdict(
+ qemu_find_opts("device"),
+ n->primary_device_dict, errp);
+ }
+ if (n->primary_device_opts) {
+ if (n->primary_dev) {
+ n->primary_bus = n->primary_dev->parent_bus;
+ }
+ qdev_set_parent_bus(n->primary_dev, n->primary_bus);
+ n->primary_should_be_hidden = false;
+ qemu_opt_set_bool(n->primary_device_opts,
+ "partially_hotplugged", true, errp);
+ hotplug_ctrl = qdev_get_hotplug_handler(n->primary_dev);
+ if (hotplug_ctrl) {
+ hotplug_handler_pre_plug(hotplug_ctrl, n->primary_dev, errp);
+ hotplug_handler_plug(hotplug_ctrl, n->primary_dev, errp);
+ }
+ if (!n->primary_dev) {
+ error_setg(errp, "virtio_net: couldn't find primary device");
+ }
+ }
+ return *errp != NULL;
+}
+
+static void virtio_net_handle_migration_primary(VirtIONet *n,
+ MigrationState *s)
+{
+ bool should_be_hidden;
+ Error *err = NULL;
+
+ should_be_hidden = atomic_read(&n->primary_should_be_hidden);
+
+ if (!n->primary_dev) {
+ n->primary_dev = virtio_connect_failover_devices(n, n->qdev, &err);
+ if (!n->primary_dev) {
+ return;
+ }
+ }
+
+ if (migration_in_setup(s) && !should_be_hidden &&
+ n->primary_dev) {
+ if (failover_unplug_primary(n)) {
+ vmstate_unregister(n->primary_dev, qdev_get_vmsd(n->primary_dev),
+ n->primary_dev);
+ qapi_event_send_unplug_primary(n->primary_device_id);
+ atomic_set(&n->primary_should_be_hidden, true);
+ } else {
+ warn_report("virtio_net: Couldn't unplug primary device");
+ }
+ } else if (migration_has_failed(s)) {
+ /* We already unplugged the device let's plugged it back */
+ if (!failover_replug_primary(n, &err)) {
+ if (err) {
+ error_report_err(err);
+ }
+ }
+ }
+}
+
+static void virtio_net_migration_state_notifier(Notifier *notifier, void *data)
+{
+ MigrationState *s = data;
+ VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
+ virtio_net_handle_migration_primary(n, s);
+}
+
+static int virtio_net_primary_should_be_hidden(DeviceListener *listener,
+ QemuOpts *device_opts)
+{
+ VirtIONet *n = container_of(listener, VirtIONet, primary_listener);
+ bool match_found;
+ bool hide;
+
+ n->primary_device_dict = qemu_opts_to_qdict(device_opts,
+ n->primary_device_dict);
+ if (n->primary_device_dict) {
+ g_free(n->standby_id);
+ n->standby_id = g_strdup(qdict_get_try_str(n->primary_device_dict,
+ "net_failover_pair_id"));
+ }
+ if (device_opts && g_strcmp0(n->standby_id, n->netclient_name) == 0) {
+ match_found = true;
+ } else {
+ match_found = false;
+ hide = false;
+ g_free(n->standby_id);
+ n->primary_device_dict = NULL;
+ goto out;
+ }
+
+ n->primary_device_opts = device_opts;
+
+ /* primary_should_be_hidden is set during feature negotiation */
+ hide = atomic_read(&n->primary_should_be_hidden);
+
+ if (n->primary_device_dict) {
+ g_free(n->primary_device_id);
+ n->primary_device_id = g_strdup(qdict_get_try_str(
+ n->primary_device_dict, "id"));
+ if (!n->primary_device_id) {
+ warn_report("primary_device_id NULL");
+ }
+ }
+
+out:
+ if (match_found && hide) {
+ return 1;
+ } else if (match_found && !hide) {
+ return 0;
+ } else {
+ return -1;
+ }
+}
+
static void virtio_net_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
@@ -2660,6 +2905,16 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
}
+ if (n->failover) {
+ n->primary_listener.should_be_hidden =
+ virtio_net_primary_should_be_hidden;
+ atomic_set(&n->primary_should_be_hidden, true);
+ device_listener_register(&n->primary_listener);
+ n->migration_state.notify = virtio_net_migration_state_notifier;
+ add_migration_state_change_notifier(&n->migration_state);
+ n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY);
+ }
+
virtio_net_set_config_size(n, n->host_features);
virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
@@ -2782,6 +3037,13 @@ static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
g_free(n->mac_table.macs);
g_free(n->vlans);
+ if (n->failover) {
+ g_free(n->primary_device_id);
+ g_free(n->standby_id);
+ qobject_unref(n->primary_device_dict);
+ n->primary_device_dict = NULL;
+ }
+
max_queues = n->multiqueue ? n->max_queues : 1;
for (i = 0; i < max_queues; i++) {
virtio_net_del_queue(n, i);
@@ -2819,6 +3081,23 @@ static int virtio_net_pre_save(void *opaque)
return 0;
}
+static bool primary_unplug_pending(void *opaque)
+{
+ DeviceState *dev = opaque;
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ VirtIONet *n = VIRTIO_NET(vdev);
+
+ return n->primary_dev ? n->primary_dev->pending_deleted_event : false;
+}
+
+static bool dev_unplug_pending(void *opaque)
+{
+ DeviceState *dev = opaque;
+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
+
+ return vdc->primary_unplug_pending(dev);
+}
+
static const VMStateDescription vmstate_virtio_net = {
.name = "virtio-net",
.minimum_version_id = VIRTIO_NET_VM_VERSION,
@@ -2828,6 +3107,7 @@ static const VMStateDescription vmstate_virtio_net = {
VMSTATE_END_OF_LIST()
},
.pre_save = virtio_net_pre_save,
+ .dev_unplug_pending = dev_unplug_pending,
};
static Property virtio_net_properties[] = {
@@ -2889,6 +3169,7 @@ static Property virtio_net_properties[] = {
true),
DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
+ DEFINE_PROP_BOOL("failover", VirtIONet, failover, false),
DEFINE_PROP_END_OF_LIST(),
};
@@ -2913,6 +3194,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data)
vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
vdc->vmsd = &vmstate_virtio_net_device;
+ vdc->primary_unplug_pending = primary_unplug_pending;
}
static const TypeInfo virtio_net_info = {
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index b96f0c643f..3da4ca382a 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -18,6 +18,7 @@
#include "standard-headers/linux/virtio_net.h"
#include "hw/virtio/virtio.h"
#include "net/announce.h"
+#include "qemu/option_int.h"
#define TYPE_VIRTIO_NET "virtio-net-device"
#define VIRTIO_NET(obj) \
@@ -43,6 +44,7 @@ typedef struct virtio_net_conf
int32_t speed;
char *duplex_str;
uint8_t duplex;
+ char *primary_id_str;
} virtio_net_conf;
/* Coalesced packets type & status */
@@ -185,6 +187,16 @@ struct VirtIONet {
AnnounceTimer announce_timer;
bool needs_vnet_hdr_swap;
bool mtu_bypass_backend;
+ QemuOpts *primary_device_opts;
+ QDict *primary_device_dict;
+ DeviceState *primary_dev;
+ BusState *primary_bus;
+ char *primary_device_id;
+ char *standby_id;
+ bool primary_should_be_hidden;
+ bool failover;
+ DeviceListener primary_listener;
+ Notifier migration_state;
};
void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 48e8d04ff6..0c857ecf1a 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -159,6 +159,7 @@ typedef struct VirtioDeviceClass {
void (*save)(VirtIODevice *vdev, QEMUFile *f);
int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
const VMStateDescription *vmsd;
+ bool (*primary_unplug_pending)(void *opaque);
} VirtioDeviceClass;
void virtio_instance_init_common(Object *proxy_obj, void *data,
--
2.21.0
As usual block all vfio-pci devices from being migrated, but make an exception for failover primary devices. This is achieved by setting unmigratable to 0 but also add a migration blocker for all vfio-pci devices except failover primary devices. These will be unplugged before migration happens by the migration handler of the corresponding virtio-net standby device. Signed-off-by: Jens Freimann <jfreimann@redhat.com> --- hw/vfio/pci.c | 31 +++++++++++++++++++++++++------ hw/vfio/pci.h | 1 + 2 files changed, 26 insertions(+), 6 deletions(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 12fac39804..a15b83c6b6 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -40,6 +40,9 @@ #include "pci.h" #include "trace.h" #include "qapi/error.h" +#include "migration/blocker.h" +#include "qemu/option.h" +#include "qemu/option_int.h" #define TYPE_VFIO_PCI "vfio-pci" #define PCI_VFIO(obj) OBJECT_CHECK(VFIOPCIDevice, obj, TYPE_VFIO_PCI) @@ -2712,12 +2715,26 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) int i, ret; bool is_mdev; + if (!pdev->net_failover_pair_id) { + error_setg(&vdev->migration_blocker, + "VFIO device doesn't support migration"); + ret = migrate_add_blocker(vdev->migration_blocker, &err); + if (err) { + error_propagate(errp, err); + goto error; + } + } else { + pdev->qdev.allow_unplug_during_migration = true; + } + if (!vdev->vbasedev.sysfsdev) { if (!(~vdev->host.domain || ~vdev->host.bus || ~vdev->host.slot || ~vdev->host.function)) { error_setg(errp, "No provided host device"); error_append_hint(errp, "Use -device vfio-pci,host=DDDD:BB:DD.F " "or -device vfio-pci,sysfsdev=PATH_TO_DEVICE\n"); + migrate_del_blocker(vdev->migration_blocker); + error_free(vdev->migration_blocker); return; } vdev->vbasedev.sysfsdev = @@ -2729,6 +2746,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) if (stat(vdev->vbasedev.sysfsdev, &st) < 0) { error_setg_errno(errp, errno, "no such host device"); error_prepend(errp, VFIO_MSG_PREFIX, vdev->vbasedev.sysfsdev); + migrate_del_blocker(vdev->migration_blocker); + error_free(vdev->migration_blocker); return; } @@ -3008,6 +3027,8 @@ out_teardown: vfio_bars_exit(vdev); error: error_prepend(errp, VFIO_MSG_PREFIX, vdev->vbasedev.name); + migrate_del_blocker(vdev->migration_blocker); + error_free(vdev->migration_blocker); } static void vfio_instance_finalize(Object *obj) @@ -3019,6 +3040,10 @@ static void vfio_instance_finalize(Object *obj) vfio_bars_finalize(vdev); g_free(vdev->emulated_config_bits); g_free(vdev->rom); + if (vdev->migration_blocker) { + migrate_del_blocker(vdev->migration_blocker); + error_free(vdev->migration_blocker); + } /* * XXX Leaking igd_opregion is not an oversight, we can't remove the * fw_cfg entry therefore leaking this allocation seems like the safest @@ -3151,11 +3176,6 @@ static Property vfio_pci_dev_properties[] = { DEFINE_PROP_END_OF_LIST(), }; -static const VMStateDescription vfio_pci_vmstate = { - .name = "vfio-pci", - .unmigratable = 1, -}; - static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); @@ -3163,7 +3183,6 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) dc->reset = vfio_pci_reset; dc->props = vfio_pci_dev_properties; - dc->vmsd = &vfio_pci_vmstate; dc->desc = "VFIO-based PCI device assignment"; set_bit(DEVICE_CATEGORY_MISC, dc->categories); pdc->realize = vfio_realize; diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index 834a90d646..b329d50338 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -168,6 +168,7 @@ typedef struct VFIOPCIDevice { bool no_vfio_ioeventfd; bool enable_ramfb; VFIODisplay *dpy; + Error *migration_blocker; } VFIOPCIDevice; uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len); -- 2.21.0