linux-kernel - Re: [RFC PATCH 5/5] x86/entry: Store CPU info on exception entry

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Date:   Fri, 05 Aug 2022 14:46:48 -0400
From:   Rik van Riel <riel@...riel.com>
To:     ira.weiny@...el.com, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [RFC PATCH 5/5] x86/entry: Store CPU info on exception entry

On Fri, 2022-08-05 at 10:30 -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The CPU information of an exception is useful in determining where
> bad
> CPUs are in a large data center.
> 
> Define arch_{save|restore}_auxiliary_pt_regs() and set
> ARCH_HAS_PTREGS_AUXILIARY default to yes.
> 
> Store the CPU on exception entry and use it later.
> 
> Cc: Rik van Riel <riel@...riel.com>
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Suggested-by: Dave Hansen <dave.hansen@...el.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

Acked-by: Rik van Riel <riel@...riel.com>

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