Re: [PATCH] x86/setup: call early_reserve_memory() earlier

From: Juergen Gross
Date: Thu Sep 16 2021 - 06:31:19 EST


On 16.09.21 12:29, Borislav Petkov wrote:
On Thu, Sep 16, 2021 at 12:09:27PM +0300, Mike Rapoport wrote:
I think the first sentence about reserving memory before memblock
allocations are possible is important and I think we should keep it.

I expanded that comment this way:

/*
* Do some memory reservations *before* memory is added to memblock, so
* memblock allocations won't overwrite it.
*
* After this point, everything still needed from the boot loader or
* firmware or kernel text should be early reserved or marked not RAM in
* e820. All other memory is free game.
*
* This call needs to happen before e820__memory_setup() which calls the
* xen_memory_setup() on Xen dom0 which relies on the fact that those
* early reservations have happened already.
*/


Yes, this seems to be an accurate description.


Juergen

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