linux-kernel - Re: [PATCH 00/24] x86/entry/64: Convert a bunch of ASM entry code into C code

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Message-ID: <20210831204459.GM4353@worktop.programming.kicks-ass.net>
Date:   Tue, 31 Aug 2021 22:44:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 00/24] x86/entry/64: Convert a bunch of ASM entry code
 into C code

On Wed, Sep 01, 2021 at 01:50:01AM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <laijs@...ux.alibaba.com>
> 
> Many ASM code in entry_64.S can be rewritten in C if they can be written
> to be non-instrumentable and are called in the right order regarding to
> whether CR3/gsbase is changed to kernel CR3/gsbase.
> 
> The patchset covert some of them to C code.

Overall, very nice! There's a lot of details to verify, but I really
like where this ends up.

I'm not sure about moving traps.c, but whatever, that's simple stuff.
I'll try and put some more eyeballs on this later.