tools: any user of xc_dom_image->allocate?

[Juergen Gross <jgross@suse.com>]

While testing xen tools patches to start a pv-domU >512GB I stumbled
over a problem in the domain builder: it is keeping track of the last
allocated virtual address in the memory image it is creating. For
very huge domains (>1TB) this virtual address will wrap around as it is
starting at -2GB and the p2m for such a domain is >2GB.

With a modern pvops kernel (4.3) this would be no problem, as it is
supporting mapping the p2m to an arbitrary address.

In the domain builder, however, I can't currently just ignore the wrap,
as after each memory allocation for the domain image dom->allocate() is
being called with the last allocated virtual address as an argument.
dom->allocate() is allowed to be NULL (in which case it isn't called).

I have found no user of dom->allocate(), deleting it from the struct
xc_dom_image and removing the call sites in xc_dom_core.c didn't break
the build.

Are there any objections to remove the allocate() function in struct
xc_dom_image?


Juergen