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: <b2a74b43-2b87-9f81-2e50-ea31cbd614c6@linux.alibaba.com>
Date:   Thu, 2 Sep 2021 14:28:43 +0800
From:   Lai Jiangshan <laijs@...ux.alibaba.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, 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 2021/9/1 04:44, Peter Zijlstra wrote:
> 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.
> 

Hello, Peter

How is it going?

Do I need to send a new version?
How can I cooperate or participate in the details?
Do you plan to move the other path of ASM code into C code?

Thanks
Lai

PS:
And I think [PATCH 12/24] ("x86/traps: Reconstruct pt_regs on task stack
directly in fixup_bad_iret()") has nothing related to moving ASM to C
is off topic to the patchset.  It can be dropped if no one needs it.