linux-kernel - Re: [PATCH 2/7] x86/entry: Move PTI_USER_* to arch/x86/include/asm/processor-flags.h

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Date:   Wed, 11 May 2022 12:25:30 +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>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>
Subject: Re: [PATCH 2/7] x86/entry: Move PTI_USER_* to
 arch/x86/include/asm/processor-flags.h

On Wed, May 11 2022 at 15:27, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
>
> These constants will be also used in C file.
>
> Move them to arch/x86/include/asm/processor-flags.h which already has
> a kin X86_CR3_PTI_PCID_USER_BIT defined in it.
>
> Remove PTI_PGTABLE_SWITCH_BIT and replace it with PTI_USER_PGTABLE_BIT
> since they are the same in meaning and value.

Just from looking at the patch it's obvious that it breaks the 32bit
CONFIG_PAGETABLE_ISOLATION=y build. Sigh.

Thanks,

        tglx