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: <be5982f8-3928-455e-969c-1e4c419d80a2@pavinjoseph.com>
Date: Fri, 29 Mar 2024 14:26:07 +0530
From: Pavin Joseph <me@...injoseph.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: 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>,
 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 13:45, Ingo Molnar wrote:
> Just to clarify, we have the following 3 upstream (and soon to be upstream) versions:
> 
>   v1: pre-d794734c9bbf kernels
>   v2: d794734c9bbf x86/mm/ident_map: Use gbpages only where full GB page should be mapped.
>   v3: c567f2948f57 Revert "x86/mm/ident_map: Use gbpages only where full GB page should be mapped."
> 
> Where v1 and v3 ought to be the same in behavior.
> 
> So how does the failure matrix look like on your systems? Is my
> understanding accurate:
> 
> 
>             regular boot  | regular kexec | nogbpages boot | nogbpages kexec boot
>   ------------------------|---------------------------------------------------
>   v1:       OK            | OK            | OK             | FAIL
>   v2:       OK            | FAIL          | FAIL           | FAIL

Slight correction:

    regular boot  | regular kexec | nogbpages boot | nogbpages kexec boot
-----------------|---------------|----------------|------------------
v1:       OK     | OK            | OK             | FAIL
v2:       OK     | FAIL          | OK             | FAIL

Pavin.