linux-kernel - Re: [PATCH 1/2] x86: Make E820_X_MAX unconditionally larger than E820MAX

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Date:   Fri, 9 Dec 2016 11:12:37 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Alex Thorlton <athorlton@....com>, linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...hat.com>, Russ Anderson <rja@....com>,
        David Vrabel <david.vrabel@...rix.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>, x86@...nel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 1/2] x86: Make E820_X_MAX unconditionally larger than
 E820MAX

On 05/12/16 18:49, Alex Thorlton wrote:
> It's really not necessary to limit E820_X_MAX to 128 in the non-EFI
> case.  This commit drops E820_X_MAX's dependency on CONFIG_EFI, so that
> E820_X_MAX is always at least slightly larger than E820MAX.
> 
> The real motivation behind this is actually to prevent some issues in
> the Xen kernel, where the XENMEM_machine_memory_map hypercall can
> produce an e820 map larger than 128 entries, even on systems where the
> original e820 table was quite a bit smaller than that, depending on how
> many IOAPICs are installed on the system.
> 
> Signed-off-by: Alex Thorlton <athorlton@....com>
> Suggested-by: Ingo Molnar <mingo@...hat.com>


Commited to xen/tip.git for-linus-4.10


Juergen