Re: [PATCH] hvmloader: probe memory below 4G before allocation for OVMF

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

On 02/04/2020 17:18, Igor Druzhinin wrote:
> The area just below 4G where OVMF image is originally relocated is not
> necessarily a hole - it might contain pages preallocated by device model
> or the toolstack. By unconditionally populating on top of this memory
> the original pages are getting lost while still potentially foreign mapped
> in Dom0.
> 
> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
> ---
> That doesn't seem necessary for at least upstream toolstack now.
> Alternative might be - to move population of this area to the toolstack
> where there is more control over memory layout.
> ---

Thanks for the discussion, please ignore this patch. We found a better way how
deal with our problem locally. We will introduce a reserved region within
MMIO hole that is managed similarly to stolen memory.

Igor