linux-kernel - Re: [PATCH v2 09/11] x86/paravirt: move the Xen-only pv_irq_ops under the PARAVIRT

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Date:   Fri, 24 Aug 2018 16:10:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org, virtualization@...ts.linux-foundation.org,
        akataria@...are.com, rusty@...tcorp.com.au,
        boris.ostrovsky@...cle.com, hpa@...or.com, tglx@...utronix.de,
        mingo@...hat.com
Subject: Re: [PATCH v2 09/11] x86/paravirt: move the Xen-only pv_irq_ops
 under the PARAVIRT_XXL umbrella

On Mon, Aug 13, 2018 at 09:37:37AM +0200, Juergen Gross wrote:
> Some of the paravirt ops defined in pv_irq_ops are for Xen PV guests
> only. Define them only if CONFIG_PARAVIRT_XXL is set.
> diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
> index e652ec27d945..ae53ee36d8fb 100644
> --- a/arch/x86/include/asm/paravirt_types.h
> +++ b/arch/x86/include/asm/paravirt_types.h
> @@ -197,8 +197,10 @@ struct pv_irq_ops {
>  	struct paravirt_callee_save irq_disable;
>  	struct paravirt_callee_save irq_enable;
>  
> +#ifdef CONFIG_PARAVIRT_XXL
>  	void (*safe_halt)(void);
>  	void (*halt)(void);
> +#endif

that makes me sad... but it appears VSMP also uses them. Can't you
simply make VSMP also select XXL, I don't think that's used quite as
much as Xen is :-)