WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] [PATCH 2/7] xen-gntdev: Change page limit to be global i

To: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/7] xen-gntdev: Change page limit to be global instead of per-open
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 11 Jan 2011 12:51:46 -0500
Cc: jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian.Campbell@xxxxxxxxxx
Delivery-date: Tue, 11 Jan 2011 09:55:55 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4D2C50EE.8010200@xxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1292545063-32107-1-git-send-email-dgdegra@xxxxxxxxxxxxx> <1292545063-32107-3-git-send-email-dgdegra@xxxxxxxxxxxxx> <20110110215245.GD15016@xxxxxxxxxxxx> <4D2C50EE.8010200@xxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.20 (2009-06-14)
On Tue, Jan 11, 2011 at 07:45:34AM -0500, Daniel De Graaf wrote:
> On 01/10/2011 04:52 PM, Konrad Rzeszutek Wilk wrote:
> >>  static long gntdev_ioctl(struct file *flip,
> >>                     unsigned int cmd, unsigned long arg)
> >>  {
> >> @@ -555,9 +538,6 @@ static long gntdev_ioctl(struct file *flip,
> >>    case IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR:
> >>            return gntdev_ioctl_get_offset_for_vaddr(priv, ptr);
> >>  
> >> -  case IOCTL_GNTDEV_SET_MAX_GRANTS:
> >> -          return gntdev_ioctl_set_max_grants(priv, ptr);
> > 
> > Would it make sense to return -EPNOTSUPPORTED? Or does it not really
> > matter as nobody has been using this ioctl call?
> 
> Does this produce a clearer error message than the default -ENOIOCTLCMD?
> It's possible that some people use it, since it was exposed as an API.

Looking at the Xen tools the user of this is:
xc_gnttab_set_max_grants which would end up returning whatever the
error is. I don't see any users of this in the Xen tools, thought there might
be some in the XCP code. Lets stay with your ENOIOCTLCMD.

However, I was wondering if you are going to submit a patch to the Xen
tool stack so that it can utlize the SysFS interface to set the limits
for that API call?

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel