Re: [Xen-devel] [XEN PATCH v2 1/2] Check zone before merging adjacent blocks in heap

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On Wed, 2020-02-05 at 11:49 +0100, Jan Beulich wrote:
> Yet, as you say elsewhere, whether an MFN has an
> entry in frame_table[] is entirely unclear, so permitting boot-
> allocator pages to be freed via alloc_domheap_pages() nevertheless
> still doesn't look any better an idea to me.

Hm, I don't think I said that, did I? That would be a new and exciting
complication.

I think every MFN handed out by the boot allocator *should* have a
corresponding entry in the frame table. All the PDX setup is done for
those pages, just as it is for heap pages. In fact, some of that setup
is *only* done in init_boot_pages() right now, and if page ranges don't
go through the boot allocator and end up being transferred to the heap
in end_boot_allocator(), things (like badpages= on the command line)
don't work right.

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