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

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Date:   Wed, 10 Aug 2022 16:03:46 -0700
From:   Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...el.com>,
        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 15:06, Thomas Gleixner wrote:
> So this affects already deployed systems and we have to
> 
>   - backport the x2apic lock changes
> 
>   - provide proper diagnostics
> 
>   - make SGX and TDX depend on X2APIC support
I'll add the comments Dave mentioned earlier, and will make SGX and TDX depend
on X2APIC since that makes sense regardless of what hw ends up with this change.
 Unless we want to get rid of CONFIG_X86_X2APIC like Dave mentioned?