linux-kernel - Re: [PATCH] x86/mm/ident_map: Use full gbpages in identity maps except on UV platform.

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Message-ID: <Zf3IqJaGlS9HMdHN@swahl-home.5wahls.com>
Date: Fri, 22 Mar 2024 13:06:32 -0500
From: Steve Wahl <steve.wahl@....com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
        Steve Wahl <steve.wahl@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        Pavin Joseph <me@...injoseph.com>, stable@...r.kernel.org,
        Eric Hagberg <ehagberg@...il.com>, Simon Horman <horms@...ge.net.au>,
        Dave Young <dyoung@...hat.com>, Sarah Brofeldt <srhb@....dk>,
        Russ Anderson <rja@....com>, Dimitri Sivanich <sivanich@....com>
Subject: Re: [PATCH] x86/mm/ident_map: Use full gbpages in identity maps
 except on UV platform.

On Fri, Mar 22, 2024 at 10:43:36AM -0700, Dave Hansen wrote:
> On 3/22/24 10:40, Dave Hansen wrote:
> >  * Mapping extra memory on UV systems causes halts[1]
> >  * Mapping extra memory on UV systems breaks kexec (this thread)
> 
> Sorry, I said that second one backwards:
> 
>  * _Not_ mapping extra memory on UV systems breaks kexec

Not quite.  This is * _Not_ mapping extra memory on _non_ UV systems
breaks kexec.

Thanks,

--> Steve

-- 
Steve Wahl, Hewlett Packard Enterprise