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migration: allow unplug during migration for failover devices

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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 PCI devices that are also
primary devices in a failover pair.

Signed-off-by: Jens Freimann <jfreimann@redhat.com>
Message-Id: <20191029114905.6856-8-jfreimann@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jens Freimann 2019-10-29 12:49:01 +01:00 committed by Michael S. Tsirkin
parent 70d04971f1
commit a1190ab628
4 changed files with 4 additions and 1 deletions
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1
hw/core/qdev.c
View File

@ -996,6 +996,7 @@ 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);

1
hw/pci/pci.c
View File

@ -2130,6 +2130,7 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
pci_qdev_unrealize(DEVICE(pci_dev), NULL);
return;
}
qdev->allow_unplug_during_migration = true;
}
/* rom loading */

1
include/hw/qdev-core.h
View File

@ -156,6 +156,7 @@ 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;

2
qdev-monitor.c
View File

@ -851,7 +851,7 @@ 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;
}