Re: [Xen-devel] save/restore image format

[John Levon <levon@xxxxxxxxxxxxxxxxx>]

On Tue, Sep 26, 2006 at 10:50:28PM +0800, Dong, Eddie wrote:

> > I still believe we should use more or less the same format for core
> > files too; in that respect we need a header field for the /type/ of
> > image. This could also identify HVM images, etc.
> 
> Using ELF like format or not is defintely an arguable topics, but it is
> not addressed in this doc yet. If we want to move to ELF, the whole
> format will be changed both for para VM and HVM, but hopefully through
> this discussion we can first identify the items we need to put in the
> image file.

Certainly.

> Another curious question for save/restore in my opnion is that should we
> encrypt the saved image or not? Given an usage model where people share
> physical computers, say an University Lab, but everybody own an virtual
> machine that is saved on network but can be restore and executed at any
> physical box. In this case, encryption to the image file is a must.
> Even for live migration, probably encryption is a must in future. With
> data file encrypted, probably the existing tools like objdump can no
> longer work the save image file even we use ELF.

I'm not sure I understand. Machine migration will happen over a secure
transport as part of the Xen API changes, or so the plan is. Local dom0
save files can surely be managed via permissions.

regards
john

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