Re: [Xen-devel] [PATCH] Allow blktap to be able to be booted assystemvolume for PV-on-HVM

["Kasai Takanori" <kasai.takanori@xxxxxxxxxxxxxx>]

Hi Daniel,

Thank you for the reply.

We think about the specification of the device as follows. 

The hda is initialized of emulator first.
It works by the emulator if there is no PV driver in the HVM domain. 
It is initialized as VBD if there is PV driver in the HVM domain. 
And, the hda changes to VBD and works as VBD. 

On the other hand, the xvda doesn't initialize it as an emulator.
It doesn't work if there is no PV driver in the HVM domain. 
It works as VBD if there is PV driver in the HVM domain. 

The hda is used as a device from which the emulator is switched to VBD. 
And, the xvd* is used as a device only for VBD. 

Therefore, the system disk is specified for hda as well as a usual HVM domain. 
Other data disks are specified for xvd*. 
We boot the HVM domain specifying both hda and xvda. 

What scenario are you assuming?
Do you initialize all 'xvd*' as an emulator?

Best Regards,

--
Takanori Kasai


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