Re: Question about skipping virDomainDiskDefAssignAddress

On Fri, Jul 16, 2021 at 09:49:40PM +0900, Motohiro Kawahito wrote: >> From: "Daniel P. Berrangé" <berrange(a)redhat.com&gt; >> To: Motohiro Kawahito <JL25131(a)jp.ibm.com&gt; >> Cc: libvir-list(a)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(a)redhat.com&gt; >>>> To: Motohiro Kawahito <JL25131(a)jp.ibm.com&gt; >>>> Cc: libvir-list(a)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.