Re: [Xen-devel] [PATCH 1/5] xen/netback: Use xenballooned pages for comms

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> (Will move to commit message). In PV guests, it is sufficient to only
> reserve kernel address space for grant mappings because Xen modifies the
> mappings directly. HVM guests require that Xen modify the GFN-to-MFN
> mapping, so the pages being remapped must already be allocated. Pages

By allocated you mean the populate_physmap hypercall must happen before
the grant operations are done?

(When I see allocated I think alloc_page, which I believe is _not_ what
you were saying).

> obtained from alloc_xenballooned_pages have valid GFNs not currently
> mapped to an MFN, so are available to be used in grant mappings.
> 

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