linux-kernel - Re: [PATCH] arm64/vmcore: Add pgtable_l5

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Message-ID: <20240827122459.GA4679@willie-the-truck>
Date: Tue, 27 Aug 2024 13:24:59 +0100
From: Will Deacon <will@...nel.org>
To: Kuan-Ying Lee <kuan-ying.lee@...onical.com>
Cc: Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
	Dave Young <dyoung@...hat.com>, Jonathan Corbet <corbet@....net>,
	Catalin Marinas <catalin.marinas@....com>,
	kexec@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	ardb@...nel.org
Subject: Re: [PATCH] arm64/vmcore: Add pgtable_l5_enabled information in
 vmcoreinfo

On Mon, Aug 26, 2024 at 02:52:02PM +0800, Kuan-Ying Lee wrote:
> Since arm64 supports 5-level page tables, we need to add this
> information to vmcoreinfo to make debug tools know if 5-level
> page table is enabled or not.
> 
> Missing this information will break the debug tool like crash [1].
> 
> [1] https://github.com/crash-utility/crash
> 
> Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@...onical.com>
> ---
>  Documentation/admin-guide/kdump/vmcoreinfo.rst | 6 ++++++
>  arch/arm64/kernel/vmcore_info.c                | 3 +++
>  2 files changed, 9 insertions(+)

In which case, wouldn't you also want to know about pgtable_l4_enabled()?

Will