linux-kernel - Re: [PATCH V5 7/7] x86/entry: Use idtentry macro for entry_INT80

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Date:   Mon, 25 Apr 2022 12:24:57 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <jroedel@...e.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH V5 7/7] x86/entry: Use idtentry macro for
 entry_INT80_compat

On Tue, Apr 12 2022 at 20:15, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
>
> entry_INT80_compat is identical to idtentry macro except a special
> handling for %rax in the prolog.

Seriously?

> -	pushq	%rsi			/* pt_regs->si */
> -	xorl	%esi, %esi		/* nospec   si */

esi is not cleared in CLEAR_REGS. So much for identical.

Thanks,

        tglx