linux-kernel - Re: [PATCH] x86/apic: Don't disable x2APIC if locked

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Date:   Wed, 10 Aug 2022 13:29:13 -0700
From:   Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "Shutemov, Kirill" <kirill.shutemov@...el.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        "Gomez Iglesias, Antonio" <antonio.gomez.iglesias@...el.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Subject: Re: [PATCH] x86/apic: Don't disable x2APIC if locked

On 8/10/22 13:06, Daniel Sneddon wrote:
> I could add a blurb to the
> documentation where nox2apic is defined as a parameter as well.  
While I'm at it, I'm thinking of adding something where CONFIG_X86_X2APIC is
defined in kconfig.  I'll put in a blurb about selecting N on SPR systems could
prevent you from booting due to the lock.