linux-kernel - Re: [PATCH v3 9/9] xen/xenbus: Rename the variable xen_store_mfn to xen_store

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Date:	Fri, 07 Aug 2015 17:33:10 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Julien Grall <julien.grall@...rix.com>,
	xen-devel@...ts.xenproject.org
CC:	ian.campbell@...rix.com, stefano.stabellini@...citrix.com,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH v3 9/9] xen/xenbus: Rename the variable xen_store_mfn
 to xen_store_gfn

On 08/07/2015 12:34 PM, Julien Grall wrote:
> The variable xen_store_mfn is effectively storing a GFN and not an MFN.
>
> Signed-off-by: Julien Grall <julien.grall@...rix.com>
>
> ---
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: David Vrabel <david.vrabel@...rix.com>
>
>      I think that the assignation of xen_start_info in
>      xenstored_local_init is pointless. Although I haven't drop it just
>      in case.

I think so too (but that would be a separate patch if you decide to do it).

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

>
>      Changes in v3:
>          - Patch added.
> ---
>   drivers/xen/xenbus/xenbus_probe.c | 14 +++++++-------
>   1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
> index b3870f4..3cbe055 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -75,7 +75,7 @@ EXPORT_SYMBOL_GPL(xen_store_interface);
>   enum xenstore_init xen_store_domain_type;
>   EXPORT_SYMBOL_GPL(xen_store_domain_type);
>   
> -static unsigned long xen_store_mfn;
> +static unsigned long xen_store_gfn;
>   
>   static BLOCKING_NOTIFIER_HEAD(xenstore_chain);
>   
> @@ -711,7 +711,7 @@ static int __init xenstored_local_init(void)
>   	if (!page)
>   		goto out_err;
>   
> -	xen_store_mfn = xen_start_info->store_mfn = virt_to_gfn((void *)page);
> +	xen_store_gfn = xen_start_info->store_mfn = virt_to_gfn((void *)page);
>   
>   	/* Next allocate a local port which xenstored can bind to */
>   	alloc_unbound.dom        = DOMID_SELF;
> @@ -785,12 +785,12 @@ static int __init xenbus_init(void)
>   		err = xenstored_local_init();
>   		if (err)
>   			goto out_error;
> -		xen_store_interface = gfn_to_virt(xen_store_mfn);
> +		xen_store_interface = gfn_to_virt(xen_store_gfn);
>   		break;
>   	case XS_PV:
>   		xen_store_evtchn = xen_start_info->store_evtchn;
> -		xen_store_mfn = xen_start_info->store_mfn;
> -		xen_store_interface = gfn_to_virt(xen_store_mfn);
> +		xen_store_gfn = xen_start_info->store_mfn;
> +		xen_store_interface = gfn_to_virt(xen_store_gfn);
>   		break;
>   	case XS_HVM:
>   		err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
> @@ -800,9 +800,9 @@ static int __init xenbus_init(void)
>   		err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
>   		if (err)
>   			goto out_error;
> -		xen_store_mfn = (unsigned long)v;
> +		xen_store_gfn = (unsigned long)v;
>   		xen_store_interface =
> -			xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
> +			xen_remap(xen_store_gfn << PAGE_SHIFT, PAGE_SIZE);
>   		break;
>   	default:
>   		pr_warn("Xenstore state unknown\n");

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