linux-kernel - Re: [Xen-devel] [PATCH v4 04/10] x86: paravirt: Wrap initialization of set_iopl

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Message-ID: <20141201153759.GE3180@laptop.dumpdata.com>
Date:	Mon, 1 Dec 2014 10:37:59 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCH v4 04/10] x86: paravirt: Wrap initialization
 of set_iopl_mask in a macro

On Sun, Nov 02, 2014 at 09:32:20AM -0800, Josh Triplett wrote:
> This will allow making set_iopl_mask optional later.
> 
> Signed-off-by: Josh Triplett <josh@...htriplett.org>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  arch/x86/include/asm/paravirt_types.h | 1 +
>  arch/x86/kernel/paravirt.c            | 2 +-
>  arch/x86/xen/enlighten.c              | 4 ++--
>  3 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
> index 7549b8b..3caf2a8 100644
> --- a/arch/x86/include/asm/paravirt_types.h
> +++ b/arch/x86/include/asm/paravirt_types.h
> @@ -143,6 +143,7 @@ struct pv_cpu_ops {
>  	void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
>  
>  	void (*set_iopl_mask)(unsigned mask);
> +#define INIT_SET_IOPL_MASK(f) .set_iopl_mask = f,
>  
>  	void (*wbinvd)(void);
>  	void (*io_delay)(void);
> diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
> index 548d25f..e7969d4 100644
> --- a/arch/x86/kernel/paravirt.c
> +++ b/arch/x86/kernel/paravirt.c
> @@ -383,7 +383,7 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
>  	.iret = native_iret,
>  	.swapgs = native_swapgs,
>  
> -	.set_iopl_mask = native_set_iopl_mask,
> +	INIT_SET_IOPL_MASK(native_set_iopl_mask)
>  	.io_delay = native_io_delay,
>  
>  	.start_context_switch = paravirt_nop,
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 1a3f044..8ad0778 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -912,7 +912,7 @@ static void xen_load_sp0(struct tss_struct *tss,
>  	xen_mc_issue(PARAVIRT_LAZY_CPU);
>  }
>  
> -static void xen_set_iopl_mask(unsigned mask)
> +static void __maybe_unused xen_set_iopl_mask(unsigned mask)
>  {
>  	struct physdev_set_iopl set_iopl;
>  
> @@ -1279,7 +1279,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
>  	.write_idt_entry = xen_write_idt_entry,
>  	.load_sp0 = xen_load_sp0,
>  
> -	.set_iopl_mask = xen_set_iopl_mask,
> +	INIT_SET_IOPL_MASK(xen_set_iopl_mask)
>  	.io_delay = xen_io_delay,
>  
>  	/* Xen takes care of %gs when switching to usermode for us */
> -- 
> 2.1.1
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xen.org
> http://lists.xen.org/xen-devel
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