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

Subject: Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.
From: Pavin Joseph <me@xxxxxxxxxxxxxxx>
Date: Fri, 29 Mar 2024 13:31:30 +0530
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Linux regressions mailing list <regressions@xxxxxxxxxxxxxxx>, stable@xxxxxxxxxxxxxxx, Eric Hagberg <ehagberg@xxxxxxxxx>, Simon Horman <horms@xxxxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, Sarah Brofeldt <srhb@xxxxxx>, Russ Anderson <rja@xxxxxxx>, Dimitri Sivanich <sivanich@xxxxxxx>, Hou Wenlong <houwenlong.hwl@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Yuntao Wang <ytcoode@xxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
In-reply-to: <ZgZqhWoRZoq5tJoU@gmail.com>
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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, butkexec fails with it on my two similar systems.


Pavin.

Follow-Ups:
- Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.
  - From: Ingo Molnar

References:
- [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.
  - From: Steve Wahl
- Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.
  - From: Ingo Molnar