<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>hi, ALL:<br></div><div>my question description as follow:<br><h1 class="word" style="box-sizing: border-box; margin: 0px; padding: 0px; font-size: 14px; font-family: AvertaStd-semibold, tahoma, 'Microsoft YaHei', '\\5FAE软雅黑', '\\5B8B体', 'Malgun Gothic', sans-serif; color: rgb(51, 51, 51); height: auto; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: 14px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><span class="basic-word" style="box-sizing: border-box; margin-right: 8px; display: inline-block; max-width: 80%; text-overflow: ellipsis; white-space: nowrap; overflow: hidden; font-size: 30px; line-height: 35px;"><br></span></h1></div><div>virsh dumpxml root-vsys_v2 > v2.xml , <br></div><div> in the v2.xml has the following information:<br></div><div> <disk type='file' device='disk'><br> <driver name='qemu' type='qcow2'/><br> <source file='/home/root-vsys_v2.qcow2'/><br> <backingStore/><br> <target dev='<span style="color: rgb(221, 64, 50);">hda</span>' bus='<span style="color: rgb(221, 64, 50);">ide</span>'/> <span style="color: rgb(221, 64, 50);"><b>// i want change the 'ide' to 'virtio', but fail</b></span><br> <alias name='ide0-0-0'/><br> <address type='drive' controller='0' bus='0' target='0' unit='0'/><br> </disk><br></div><div><br></div><div>so i create a new xml name v2-new.xml ,it content is:<br></div> <disk type='file' device='disk'><br> <driver name='qemu' type='qcow2'/><br> <source file='/home/root-vsys_v2.qcow2'/><br> <target dev='<span style="color: rgb(221, 64, 50);">vda</span>' bus='<span style="color: rgb(221, 64, 50);">virtio</span>'/><br> </disk><br><div><br></div><div>then run:</div><div>virsh update-device root-vsys_v2 /root/v2-new.xml --live <br></div><div>the result is:</div><div>[root@NSG ~]# virsh update-device root-vsys_v2 /root/v2-new.xml --live<br>error: Failed to update device from /root/v2-new.xml<br>error: internal error: No device with bus 'virtio' and target 'vda'</div><div><br></div><div>i read the source code for libvirt ,the log outprint at funcion:</div><div>static int<br>qemuDomainChangeDiskLive(virDomainObjPtr vm,<br> virDomainDeviceDefPtr dev,<br> virQEMUDriverPtr driver,<br> bool force)<br>{<br> virDomainDiskDefPtr disk = dev->data.disk;<br> virDomainDiskDefPtr orig_disk = NULL;<br> virDomainDeviceDef oldDev = { .type = dev->type };<br> int ret = -1;<br><br> if (!(orig_disk = virDomainDiskFindByBusAndDst(vm->def,<br> disk->bus, disk->dst))) {<br> virReportError(VIR_ERR_INTERNAL_ERROR,<br> _("No device with bus '%s' and target '%s'"),<br> virDomainDiskBusTypeToString(disk->bus),<br> disk->dst); <span style="color: rgb(221, 64, 50);"><b>//the failure log is here, the vm->def has disk item :dev = hda, bus=ide ,and disk->bus = virtio disk->dst=vda,</b> </span><br> goto cleanup;<br> }<br></div><div><span style="color: rgb(221, 64, 50);"><b>//the disk->bus and disk->dst can't in the vm->def ,so the api virDomainDiskFindByBusAndDst failed</b></span><br> oldDev.data.disk = orig_disk;<br> if (virDomainDefCompatibleDevice(vm->def, dev, &oldDev,<br> VIR_DOMAIN_DEVICE_ACTION_UPDATE,<br> true) < 0)<br> goto cleanup;<br><br> if (!qemuDomainDiskChangeSupported(disk, orig_disk))<br> goto cleanup;<br><br> if (!virStorageSourceIsSameLocation(disk->src, orig_disk->src)) {<br> /* Disk source can be changed only for removable devices */<br> if (disk->device != VIR_DOMAIN_DISK_DEVICE_CDROM &&<br> disk->device != VIR_DOMAIN_DISK_DEVICE_FLOPPY) {<br> virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",<br> _("disk source can be changed only in removable "<br> "drives"));<br> goto cleanup;<br> }<br><br> if (qemuDomainAttachDeviceDiskLive(driver, vm, dev, force) < 0)<br> goto cleanup;<br> }<br><br> orig_disk->startupPolicy = dev->data.disk->startupPolicy;<br> orig_disk->snapshot = dev->data.disk->snapshot;<br><br> ret = 0;<br> cleanup:<br> return ret;<br>}<br></div><div><br></div><div>what reason lead the faiure ? is my v2-new.xml write error ? how to write the xml for virsh update-device ? <br></div><div><br></div><div><br></div><div><br></div><div>i refer the link <br></div><div>https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/virtualization_host_configuration_and_guest_installation_guide/form-virtualization_host_configuration_and_guest_installation_guide-para_virtualized_drivers-using_kvm_para_virtualized_drivers_for_existing_devices<br></div><br><div style="position:relative;zoom:1">--------------------------</div><div style="position:relative;zoom:1">thanks !</div><div style="position:relative;zoom:1">thosmas.kuang<br><div style="clear:both"></div></div></div><br><br><span title="neteasefooter"><p> </p></span>