Re: [Xen-devel] [PATCH 5/8] xen/vmap: allow vmap() to be called during early boot

[Julien Grall <julien@xxxxxxx>]

Hi David,

On 01/02/2020 00:33, David Woodhouse wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
I am a bit concerned with this change, particularly the consequence this 
have for the page-tables. There is an assumption that intermediate 
page-tables allocated via the boot allocator will never be freed.
On x86, a call to vunmap() will not free page-tables, but a subsequent 
call to vmap() may free it depending on the mapping size. So we would 
call free_domheap_pages() rather than init_heap_pages().
I am not entirely sure what is the full consequence, but I think this is 
a call for investigation and write it down a summary in the commit message.
Cheers,

--
Julien Grall

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