linux-kernel - Re: [PATCH V3 0/7] x86/entry: Clean up entry code

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Message-ID: <YjH+VdHIiHZM3maD@hirez.programming.kicks-ass.net>
Date:   Wed, 16 Mar 2022 16:12:21 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Borislav Petkov <bp@...en8.de>,
        Lai Jiangshan <jiangshan.ljs@...group.com>
Subject: Re: [PATCH V3 0/7] x86/entry: Clean up entry code

On Tue, Mar 15, 2022 at 03:39:42PM +0800, Lai Jiangshan wrote:

> Lai Jiangshan (7):
>   x86/entry: Use idtentry macro for entry_INT80_compat
>   x86/traps: Move pt_regs only in fixup_bad_iret()
>   x86/entry: Switch the stack after error_entry() returns
>   x86/entry: move PUSH_AND_CLEAR_REGS out of error_entry
>   x86/entry: Move cld to the start of idtentry
>   x86/entry: Don't call error_entry for XENPV
>   x86/entry: Convert SWAPGS to swapgs and remove the definition of
>     SWAPGS

So AFAICT these patches are indeed correct.

I do however worry a little bit about the I$ impact of patch 4, and
there's a few niggles, but otherwise looks good.

I'd love for some of the other x86 people to also look at this, but a
tentative ACK on this.