linux-kernel - Re: [PATCH] x86/paravirt: Fix build PARAVIRT_XXL=y without XEN

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Date:   Wed, 17 Nov 2021 10:46:30 -0800
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>
Subject: Re: [PATCH] x86/paravirt: Fix build PARAVIRT_XXL=y without XEN_PV



On 11/17/21 10:42 AM, Kirill A. Shutemov wrote:
> On Wed, Nov 17, 2021 at 07:35:01PM +0100, Peter Zijlstra wrote:
>> On Wed, Nov 17, 2021 at 09:14:39PM +0300, Kirill A. Shutemov wrote:
>>> TDX is going to use CONFIG_PARAVIRT_XXL
>>
>> *AARGGHHH*. srlsy? We were trying to cut back on that insanity, not
>> proliferate it.
> 
> It is a way to minimize amount of changes needed for getting TDX
> functinal. We will remove the dependency later on.
> 

TDX has a requirement to use HLT paravirt calls (which is currently
listed under PARAVIRT_XXL). Once we submit a patch to move it
under CONFIG_PARAVIRT, we will drop this dependency.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer