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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 05.02.2020 12:23, David Woodhouse wrote:
> 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.

I guess I should have said "whether an MFN has a properly initialized
entry in frame_table[] is entirely unclear".

Jan


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