Re: [libvirt] Qemu only support VHDx disk format, but libvirt force use VHD format

Hello all, I am trying to use a VHDx format disk on libvirt. According to https://en.wikibooks.org/wiki/QEMU/Images, Qemu supports VHDx but not VHD. But when I set disk format to 'vhdx' in virt-manager, it prompts "Error changing VM configuration: Expected a wrapped C Object but got <type 'NoneType'>" Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/addhardware.py", line 765, in change_config_helper define_func(devobj=devobj, do_hotplug=False, **define_args) File "/usr/share/virt-manager/virtManager/domain.py", line 847, in define_disk self._redefine_xmlobj(xmlobj) File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 389, in _redefine_xmlobj self._define(newxml) File "/usr/share/virt-manager/virtManager/domain.py", line 1156, in _define self.conn.define_domain(newxml) File "/usr/share/virt-manager/virtManager/connection.py", line 678, in define_domain return self._backend.defineXML(xml) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3622, in defineXML __tmp = virDomain(self,_obj=ret) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 453, in __init__ raise Exception("Expected a wrapped C Object but got %s" % type(_obj)) Exception: Expected a wrapped C Object but got <type 'NoneType'>

Then I use `virsh edit MyDOM` to edit my domain XML, change disk format to "vhdx" then I get error: "Unable to validate doc against /usr/share/libvirt/schemas/domain.rng".

So I edit /usr/share/libvirt/schemas/storagecommon.rng, change "<value>vhd</value>" to "<value>vhdx</value>" in <define name='storageFormat'>. But it still not works, and virsh tells me `error: unsupported configuration: unknown driver format value 'vhdx' `. I choice ignore , but then same error and I can't ignore: only Yes to re-edit or No to give up.

Then I suppose "vhd" in libvirt means "vhdx", so I change disk format to "vhd". But then when I run domain, Qemu get error: " Unknown driver 'vhd' ". It seems libvirt pass "vhd" to Qemu, but Qemu only support "vhdx"

At last, I use Qemu paramaters: ` -drive file=/Path/To/File.vhdx,format=vhdx,if=none,id=drive-sata0-0-3 `, and it works. When I use `-drive format=vhd` , Qemu gives me same error: " Unknown driver 'vhd' ".

So I think it maybe a bug that libvirt forcely demand format is "vhd" and I find no way to change it, but in same time Qemu only accept format "vhdx" as paramater. I try to edit `/usr/lib/python2.7/dist-packages/libvirt.py` but I have no idea how to modify it. And it seems only changing of storagecommon.rng is not enough. My libvirt version is 3.6.0 and Qemu version is 2.8.1.

Regards, Mitori -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list