Re: [libvirt] [RFC v1 4/6] migration: Migration support for ephemeral hostdevs

add migration support for ephemeral host devices, introduce two 'detach' and 'restore' functions to unplug/plug host devices during migration. Signed-off-by: Chen Fan <chen.fan.fnst(a)cn.fujitsu.com&gt; --- src/qemu/qemu_migration.c | 171 ++++++++++++++++++++++++++++++++++++++++++++-- src/qemu/qemu_migration.h | 9 +++ src/qemu/qemu_process.c | 11 +++ 3 files changed, 187 insertions(+), 4 deletions(-) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index 56112f9..d5a698f 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -3384,6 +3384,158 @@ qemuMigrationPrepareDef(virQEMUDriverPtr driver, return def; } +int +qemuMigrationDetachEphemeralDevices(virQEMUDriverPtr driver, + virDomainObjPtr vm, + bool live) +{ + qemuDomainObjPrivatePtr priv = vm->privateData; + virDomainHostdevDefPtr hostdev; + virDomainNetDefPtr net; + virDomainDeviceDef dev; + virDomainDeviceDefPtr dev_copy = NULL; + virCapsPtr caps = NULL; + int actualType; + int ret = -1; + size_t i; + + VIR_DEBUG("Rum domain detach ephemeral devices"); + + if (!(caps = virQEMUDriverGetCapabilities(driver, false))) + return ret; + + for (i = 0; i < vm->def->nnets;) { + net = vm->def->nets[i]; + + actualType = virDomainNetGetActualType(net); + if (actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV) { + i++; + continue; + } + + hostdev = virDomainNetGetActualHostdev(net); + if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS || + hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI || + !hostdev->ephemeral) { + i++; + continue; + } + + dev.type = VIR_DOMAIN_DEVICE_NET; + dev.data.net = net; + + dev_copy = virDomainDeviceDefCopy(&dev, vm->def, + caps, driver->xmlopt); + if (!dev_copy) + goto cleanup; + + if (live) { + /* nnets reduced */ + if (qemuDomainDetachNetDevice(driver, vm, dev_copy) < 0) + goto cleanup;