linux-kernel - Re: [Xen-devel] [PATCH] xen/hvm: If we fail to fetch an HVM parameter print out which flag it is.

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Date:	Mon, 5 Nov 2012 11:25:40 +0100
From:	Ian Campbell <ian.campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen/hvm: If we fail to fetch an HVM
 parameter print out which flag it is.

On Fri, 2012-11-02 at 16:37 +0000, Konrad Rzeszutek Wilk wrote:
> Like this?

Yup. Although I'm not sure if it really needs to be inlined. I guess
it's not an especially performance sensitve path though.

> 
> From 66705b0ff8808d86c12fcb3815d849a848b5409b Mon Sep 17 00:00:00 2001
> From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Date: Fri, 19 Oct 2012 15:01:46 -0400
> Subject: [PATCH] xen/hvm: If we fail to fetch an HVM parameter print out
>  which flag it is.
> 
> Makes it easier to troubleshoot in the field.
> 
> [v1: Use macro per Ian's suggestion]
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Acked-by: Ian Campbell <ian.campbell@...rix.com>

> ---
>  include/xen/hvm.h | 34 ++++++++++++++++++++++++++++++++--
>  1 file changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/include/xen/hvm.h b/include/xen/hvm.h
> index b193fa2..13e43e4 100644
> --- a/include/xen/hvm.h
> +++ b/include/xen/hvm.h
> @@ -5,6 +5,36 @@
>  #include <xen/interface/hvm/params.h>
>  #include <asm/xen/hypercall.h>
>  
> +static const char *param_name(int op)
> +{
> +#define PARAM(x) [HVM_PARAM_##x] = #x
> +	static const char *const names[] = {
> +		PARAM(CALLBACK_IRQ),
> +		PARAM(STORE_PFN),
> +		PARAM(STORE_EVTCHN),
> +		PARAM(PAE_ENABLED),
> +		PARAM(IOREQ_PFN),
> +		PARAM(BUFIOREQ_PFN),
> +		PARAM(TIMER_MODE),
> +		PARAM(HPET_ENABLED),
> +		PARAM(IDENT_PT),
> +		PARAM(DM_DOMAIN),
> +		PARAM(ACPI_S_STATE),
> +		PARAM(VM86_TSS),
> +		PARAM(VPT_ALIGN),
> +		PARAM(CONSOLE_PFN),
> +		PARAM(CONSOLE_EVTCHN),
> +	};
> +#undef PARAM
> +
> +	if (op >= ARRAY_SIZE(names))
> +		return "unknown";
> +
> +	if (!names[op])
> +		return "reserved";
> +
> +	return names[op];
> +}
>  static inline int hvm_get_parameter(int idx, uint64_t *value)
>  {
>  	struct xen_hvm_param xhv;
> @@ -14,8 +44,8 @@ static inline int hvm_get_parameter(int idx, uint64_t *value)
>  	xhv.index = idx;
>  	r = HYPERVISOR_hvm_op(HVMOP_get_param, &xhv);
>  	if (r < 0) {
> -		printk(KERN_ERR "Cannot get hvm parameter %d: %d!\n",
> -			idx, r);
> +		printk(KERN_ERR "Cannot get hvm parameter %s (%d): %d!\n",
> +			param_name(idx), idx, r);
>  		return r;
>  	}
>  	*value = xhv.value;


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