linux-kernel - Re: [RFC PATCH] xen/x86: Increase xen_e820_map to E820_X

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Message-ID: <20161115152209.GA67776@stormcage.americas.sgi.com>
Date:   Tue, 15 Nov 2016 09:22:09 -0600
From:   Alex Thorlton <athorlton@....com>
To:     Juergen Gross <jgross@...e.com>
Cc:     Jan Beulich <JBeulich@...e.com>,
        David Vrabel <david.vrabel@...rix.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        xen-devel@...ts.xenproject.org, Ingo Molnar <mingo@...hat.com>,
        Alex Thorlton <athorlton@....com>, Russ Anderson <rja@....com>,
        linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC PATCH] xen/x86: Increase xen_e820_map to E820_X_MAX
 possible entries

On Tue, Nov 15, 2016 at 10:55:49AM +0100, Juergen Gross wrote:
> I'd go with the new error code. What about E2BIG or ENOSPC?
> 
> I think the hypervisor should fill in the number of entries required
> in this case.
> 
> In case nobody objects I can post patches for this purpose (both Xen
> and Linux).

This sounds like a good solution to me.  I think it's definitely more
appropriate than simply bumping up the size of xen_e820_map, especially
considering the fact that it's theoretically possible for the e820 map
generated by the hypercall to grow too large, even on a non-EFI machine,
where my change would have no effect.

Thanks for your input!

- Alex