Question about skipping virDomainDiskDefAssignAddress

[Daniel P. Berrangé]

On Fri, Jul 16, 2021 at 09:49:40PM +0900, Motohiro Kawahito wrote:
> > From: "Daniel P. Berrangé" <berrange at redhat.com>
> > To: Motohiro Kawahito <JL25131 at jp.ibm.com>
> > Cc: libvir-list at redhat.com
> > Date: 2021/07/16 17:22
> > Subject: [EXTERNAL] Re: Question about skipping 
> virDomainDiskDefAssignAddress
> > 
> > On Fri, Jul 16, 2021 at 01:01:50PM +0900, Motohiro Kawahito wrote:
> > > > From: "Daniel P. Berrangé" <berrange at redhat.com>
> > > > To: Motohiro Kawahito <JL25131 at jp.ibm.com>
> > > > Cc: libvir-list at redhat.com
> > > > Date: 2021/07/16 00:42
> > > > Subject: [EXTERNAL] Re: Question about skipping 
> > > virDomainDiskDefAssignAddress
> > > > 
> > > 
> > > > With the exception of paravirtualized Xen guests, this field in
> > > > libvirt XML is *completely* independant of the guest assigned
> > > > device name.
> > > > 
> > > > eg the XML might say /dev/vda, but the guest might decde to
> > > > call it /dev/sda, or /dev/whatever or really absolutely
> > > > anything.
> > > 
> > > Thank you very much for this information! I understand it. 
> > > However, I don't understand how we can pass the target device 
> information 
> > > (e.g. 0A80) without an error. Do you know how to do it?
> > > 
> > > My question was not good, so I opened another thread (How do we 
> specify 
> > > disk device names for non-Linux VMs in XML?).
> > 
> > There is nothing that needs passing. The guest OS decides its naming
> > however it wants to.
> 
> We need to control device number from user. This device number would be 
> used later, such as detach-disk. Can we pass device number from outside?

Detach-disk requires the same information that is provided when the
disk is first configured in libvir. This is completely separate to the
device number / name seen inside the guest.


Regards,
Daniel
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