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

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Date:   Mon, 22 Nov 2021 13:55:26 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Lai Jiangshan <jiangshanlai+lkml@...il.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.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 20.11.21 02:23, Lai Jiangshan wrote:
> On Fri, Nov 19, 2021 at 6:20 PM Kirill A. Shutemov <kirill@...temov.name> wrote:
> 
>>> It is part of what CONFIG_PARAVIRT_XXL was designed for to enable
>>> pv-aware INTERRUPT_RETURN.
>>
>> That's very vague statement.
>>
>> Could you elaborate on what is wrong with proposed fix?
>>
> 
> Although CONFIG_PARAVIRT_XXL is enabled only when XEN, but they are
> separated configs.  There is no wrong with the patch, but it is not
> justified to narrow the scope of INTERRUPT_RETURN.

xen_iret is defined only with CONFIG_XEN_PV, so using that in
INTERRUPT_RETURN only in case CONFIG_XEN_PV is defined is absolutely
the right thing to do.

In case another user of INTERRUPT_RETURN would come up, it would
need to be changed again anyway.


Juergen

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