linux-kernel - Re: [PATCH v2 04/11] xen/hvmlite: Allow HVMlite guests delay initializing grant table

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Date:	Wed, 3 Feb 2016 19:59:48 +0100
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	david.vrabel@...rix.com, konrad.wilk@...cle.com,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	roger.pau@...rix.com
Subject: Re: [PATCH v2 04/11] xen/hvmlite: Allow HVMlite guests delay
 initializing grant table

On Mon, Feb 01, 2016 at 10:38:50AM -0500, Boris Ostrovsky wrote:
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index c49f79e..9a239d5 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -1147,13 +1147,13 @@ EXPORT_SYMBOL_GPL(gnttab_init);
>  
>  static int __gnttab_init(void)
>  {
> +	if (!xen_domain())
> +		return -ENODEV;
> +
>  	/* Delay grant-table initialization in the PV on HVM case */
> -	if (xen_hvm_domain())
> +	if (xen_hvm_domain() && !xen_hvmlite)
>  		return 0;
>  
> -	if (!xen_pv_domain())
> -		return -ENODEV;
> -
>  	return gnttab_init();
>  }

For instance if we had pv types generalized then this would just be a one line
addition for __gnttab_init() to support hvmlite. Much cleaner, generalizes the
extensions and gets folks thinking about the types on all calls Xen init call
sites.

  Luis