Received-SPF: pass (google.com: domain of linux-kernel+bounces-111914-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Date: Fri, 22 Mar 2024 13:06:32 -0500
From: Steve Wahl <steve.wahl@hpe.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Steve Wahl <steve.wahl@hpe.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Borislav Petkov <bp@alien8.de>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org,
        Linux regressions mailing list <regressions@lists.linux.dev>,
        Pavin Joseph <me@pavinjoseph.com>, stable@vger.kernel.org,
        Eric Hagberg <ehagberg@gmail.com>, Simon Horman <horms@verge.net.au>,
        Dave Young <dyoung@redhat.com>, Sarah Brofeldt <srhb@dbc.dk>,
        Russ Anderson <rja@hpe.com>, Dimitri Sivanich <sivanich@hpe.com>
Subject: Re: [PATCH] x86/mm/ident_map: Use full gbpages in identity maps
 except on UV platform.
Message-ID: <Zf3IqJaGlS9HMdHN@swahl-home.5wahls.com>
References: <20240322162135.3984233-1-steve.wahl@hpe.com>
 <003f1e83-fd93-4f4f-a316-d3e89e5a23a5@intel.com>
 <87le6ab2bn.fsf@email.froward.int.ebiederm.org>
 <2f8d726a-9800-4068-9c0c-6c4a79d69a85@intel.com>
 <01e64b89-8d30-45c5-9b83-f2e4d81b6344@intel.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <01e64b89-8d30-45c5-9b83-f2e4d81b6344@intel.com>

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