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

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Message-ID: <YZVvdyHhPTzzZbiu@zn.tnic>
Date:   Wed, 17 Nov 2021 22:09:11 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.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 Wed, Nov 17, 2021 at 12:54:56PM -0800, Sathyanarayanan Kuppuswamy wrote:
> It is not only for idle case. We also need to support emulation of
> normal halt case (which is used in cases like reboot or
> early_fixup_exception(), etc.).

This is more of that piecemeal feeding of people asking why. Please sit
down and explain exactly and in detail why you need this. "We need to
support emulation" is not nearly good enough.

I don't think any of the people who replied on this thread *actually*
know *why* PV support is needed.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette