linux-kernel - Re: [PATCH v8 02/11] x86/tdx: Introduce INTEL_TDX

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Message-ID: <ba068e29-aefd-8e78-48e0-5431abd93f31@linux.intel.com>
Date:   Tue, 5 Oct 2021 07:48:25 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>,
        Sathyanarayanan Kuppuswamy Natarajan 
        <sathyanarayanan.nkuppuswamy@...il.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option



On 10/5/21 7:13 AM, Borislav Petkov wrote:
> On Tue, Oct 05, 2021 at 06:29:43AM -0700, Sathyanarayanan Kuppuswamy Natarajan wrote:
>> For the TDX guest, x2apic will be emulated. So it will exist in our
>> case. Even if x2apic or TDX guest is not supported by CPU, it will
>> boot just fine.
> 
> Sure but why is it "select" and not "depends"?
> 
> Why does X86_X2APIC need to be selected while the others are "depends"?

Since x2APIC will always exist in TDX guest case, we have used select to
enable the support. But since we have dependency on it, I  think "depends"
might be a better choice.

> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer