From: Ingo Molnar <mingo@kernel.org>
To: Pavin Joseph <me@pavinjoseph.com>
Cc: 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>,
stable@vger.kernel.org, Eric Hagberg <ehagberg@gmail.com>,
Simon Horman <horms@verge.net.au>,
Eric Biederman <ebiederm@xmission.com>,
Dave Young <dyoung@redhat.com>, Sarah Brofeldt <srhb@dbc.dk>,
Russ Anderson <rja@hpe.com>, Dimitri Sivanich <sivanich@hpe.com>,
Hou Wenlong <houwenlong.hwl@antgroup.com>,
Andrew Morton <akpm@linux-foundation.org>,
Baoquan He <bhe@redhat.com>, Yuntao Wang <ytcoode@gmail.com>,
Bjorn Helgaas <bhelgaas@google.com>
Subject: Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.
Date: Fri, 29 Mar 2024 14:30:37 +0100 [thread overview]
Message-ID: <ZgbCfVPvWroCnGE4@gmail.com> (raw)
In-Reply-To: <be5982f8-3928-455e-969c-1e4c419d80a2@pavinjoseph.com>
* Pavin Joseph <me@pavinjoseph.com> wrote:
> 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:
> Slight correction:
>
> regular boot | regular kexec | nogbpages boot | nogbpages kexec boot
> -----------------|---------------|----------------|------------------
> v1: OK | OK | OK | FAIL
> v2: OK | FAIL | OK | FAIL
Thanks!
So the question is now: does anyone have a theory about in what fashion
the kexec nogbpages bootup differs from the regular nogbpages bootup to
break on your system?
I'd have expected the described root cause of the firmware not properly
enumerating all memory areas that need to be mapped to cause trouble on
regular, non-kexec nogbpages bootups too. What makes the kexec bootup
special to trigger this crash?
Ingo
next prev parent reply other threads:[~2024-03-29 13:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-28 16:06 [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped Steve Wahl
2024-03-28 16:10 ` kernel test robot
2024-03-28 16:17 ` Steve Wahl
2024-03-29 7:15 ` Ingo Molnar
2024-03-29 8:01 ` Pavin Joseph
2024-03-29 8:15 ` Ingo Molnar
2024-03-29 8:56 ` Pavin Joseph
2024-03-29 13:30 ` Ingo Molnar [this message]
2024-03-31 3:55 ` Eric W. Biederman
2024-04-01 13:30 ` Pavin Joseph
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