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

[Borislav Petkov]

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.
         */

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette