linux-kernel - Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.

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Message-ID: <47302624-6466-41a7-85db-f6872d58a4d2@pavinjoseph.com>
Date: Fri, 29 Mar 2024 13:31:30 +0530
From: Pavin Joseph <me@...injoseph.com>
To: Ingo Molnar <mingo@...nel.org>, Steve Wahl <steve.wahl@....com>
Cc: 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>,
 stable@...r.kernel.org, Eric Hagberg <ehagberg@...il.com>,
 Simon Horman <horms@...ge.net.au>, Eric Biederman <ebiederm@...ssion.com>,
 Dave Young <dyoung@...hat.com>, Sarah Brofeldt <srhb@....dk>,
 Russ Anderson <rja@....com>, Dimitri Sivanich <sivanich@....com>,
 Hou Wenlong <houwenlong.hwl@...group.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Baoquan He <bhe@...hat.com>,
 Yuntao Wang <ytcoode@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only
 where full GB page should be mapped.

On 3/29/24 12:45, Ingo Molnar wrote:
> Does the 'nogbpages' kernel command line option fail on these systems
> even outside of kexec (ie. regular boot), or only in combination with
> kexec?

Original reporter here, using nogbpages allows for normal bootup, but 
kexec fails with it on my two similar systems.

Pavin.