linux-kernel - Re: [PATCH] x86/setup: call early_reserve

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Message-ID: <780610f6-de4f-625d-e242-97063cea7cc5@suse.com>
Date:   Thu, 16 Sep 2021 12:31:14 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Borislav Petkov <bp@...en8.de>, Mike Rapoport <rppt@...nel.org>
Cc:     Jan Beulich <jbeulich@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, xen-devel@...ts.xenproject.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/setup: call early_reserve_memory() earlier

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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