Re: [Xen-devel] [PATCH v6 3/3] tools/libxc: use superpages during restore of HVM guest

[Olaf Hering <olaf@xxxxxxxxx>]

On Wed, Aug 30, Wei Liu wrote:

> As far as I can tell the algorithm in the patch can't handle:
> 
> 1. First pfn in a batch points to start of second 1G address space
> 2. Second pfn in a batch points to a page in the middle of first 1G
> 3. Guest can only use 1G ram

In which way does it not handle it? Over-allocation is supposed to be
handled by the "ctx->restore.tot_pages + sp->count >
ctx->restore.max_pages" checks. Do you mean the second 1G is allocated,
then max_pages is reached, and allocation in other areas is not possible
anymore?
Can this actually happen with the available senders? If not, this is
again the missing memory map.

Olaf

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