At 2019-12-20 19:23:59, "thomas" <[email protected]> wrote:
hi, ALL:
my question description as follow:
virsh dumpxml root-vsys_v2 > v2.xml ,
in the v2.xml has the following information:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/home/root-vsys_v2.qcow2'/>
<backingStore/>
<target dev='hda' bus='ide'/> // i want change the 'ide' to 'virtio',
but fail
<alias name='ide0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
so i create a new xml name v2-new.xml ,it content is:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/home/root-vsys_v2.qcow2'/>
<target dev='vda' bus='virtio'/>
</disk>
then run:
virsh update-device root-vsys_v2 /root/v2-new.xml --live
the result is:
[root@NSG ~]# virsh update-device root-vsys_v2 /root/v2-new.xml --live
error: Failed to update device from /root/v2-new.xml
error: internal error: No device with bus 'virtio' and target 'vda'
i read the source code for libvirt ,the log outprint at funcion:
static int
qemuDomainChangeDiskLive(virDomainObjPtr vm,
virDomainDeviceDefPtr dev,
virQEMUDriverPtr driver,
bool force)
{
virDomainDiskDefPtr disk = dev->data.disk;
virDomainDiskDefPtr orig_disk = NULL;
virDomainDeviceDef oldDev = { .type = dev->type };
int ret = -1;
if (!(orig_disk = virDomainDiskFindByBusAndDst(vm->def,
disk->bus, disk->dst))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("No device with bus '%s' and target '%s'"),
virDomainDiskBusTypeToString(disk->bus),
disk->dst); //the failure log is here, the vm->def has
disk item :dev = hda, bus=ide ,and disk->bus = virtio disk->dst=vda,
goto cleanup;
}
//the disk->bus and disk->dst can't in the vm->def ,so the api
virDomainDiskFindByBusAndDst failed
oldDev.data.disk = orig_disk;
if (virDomainDefCompatibleDevice(vm->def, dev, &oldDev,
VIR_DOMAIN_DEVICE_ACTION_UPDATE,
true) < 0)
goto cleanup;
if (!qemuDomainDiskChangeSupported(disk, orig_disk))
goto cleanup;
if (!virStorageSourceIsSameLocation(disk->src, orig_disk->src)) {
/* Disk source can be changed only for removable devices */
if (disk->device != VIR_DOMAIN_DISK_DEVICE_CDROM &&
disk->device != VIR_DOMAIN_DISK_DEVICE_FLOPPY) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("disk source can be changed only in removable "
"drives"));
goto cleanup;
}
if (qemuDomainAttachDeviceDiskLive(driver, vm, dev, force) < 0)
goto cleanup;
}
orig_disk->startupPolicy = dev->data.disk->startupPolicy;
orig_disk->snapshot = dev->data.disk->snapshot;
ret = 0;
cleanup:
return ret;
}
what reason lead the faiure ? is my v2-new.xml write error ? how to write the
xml for virsh update-device ?
i refer the link
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
--------------------------
thanks !
thosmas.kuang
<domain type='kvm' id='1'>
<name>root-vsys_v2</name>
<uuid>6ff7a178-6d0b-4a7f-ac0d-94f3fb9b52e3</uuid>
<memory unit='KiB'>4194304</memory>
<currentMemory unit='KiB'>4194304</currentMemory>
<memoryBacking>
<hugepages>
<page size='2048' unit='KiB' nodeset='0'/>
</hugepages>
</memoryBacking>
<vcpu placement='static'>2</vcpu>
<numatune>
<memory mode='strict' nodeset='0'/>
</numatune>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-3.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>Broadwell</model>
<vendor>Intel</vendor>
<topology sockets='1' cores='2' threads='1'/>
<feature policy='require' name='vme'/>
<feature policy='require' name='ss'/>
<feature policy='require' name='f16c'/>
<feature policy='require' name='rdrand'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='arat'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='xsaveopt'/>
<feature policy='require' name='abm'/>
<feature policy='require' name='topoext'/>
<feature policy='disable' name='erms'/>
<numa>
<cell id='0' cpus='0-1' memory='4194304' unit='KiB' memAccess='shared'/>
</numa>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/local/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/home/root-vsys_v2.qcow2'/>
<backingStore/>
<target dev='hda' bus='ide'/>
<alias name='ide0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='piix3-uhci'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<interface type='vhostuser'>
<mac address='00:04:00:02:01:11'/>
<source type='unix' path='/secgate/var/run/vh-1-2-0-1-1-1' mode='client'>
<reconnect enabled='yes' timeout='60'/>
</source>
<model type='virtio'/>
<driver queues='2'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<interface type='vhostuser'>
<mac address='00:04:00:02:01:14'/>
<source type='unix' path='/secgate/var/run/vh-1-2-0-1-1-4' mode='client'>
<reconnect enabled='yes' timeout='60'/>
</source>
<model type='virtio'/>
<driver queues='2'/>
<alias name='net1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</interface>
<interface type='vhostuser'>
<mac address='00:04:00:02:01:12'/>
<source type='unix' path='/secgate/var/run/vh-1-2-0-1-1-2' mode='client'>
<reconnect enabled='yes' timeout='60'/>
</source>
<model type='virtio'/>
<driver queues='2'/>
<alias name='net2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</interface>
<interface type='vhostuser'>
<mac address='00:04:00:02:01:13'/>
<source type='unix' path='/secgate/var/run/vh-1-2-0-1-1-3' mode='client'>
<reconnect enabled='yes' timeout='60'/>
</source>
<model type='virtio'/>
<driver queues='2'/>
<alias name='net3'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'>
<alias name='input0'/>
</input>
<input type='keyboard' bus='ps2'>
<alias name='input1'/>
</input>
<graphics type='vnc' port='5900' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
</devices>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+0:+0</label>
<imagelabel>+0:+0</imagelabel>
</seclabel>
</domain>
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