linux-kernel - Re: [Xen-devel] [PATCH V2 6/7]: PVH: balloon and grant changes

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Message-ID: <1350466326.2460.40.camel@zakaz.uk.xensource.com>
Date:	Wed, 17 Oct 2012 10:32:06 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Mukesh Rathor <mukesh.rathor@...cle.com>
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 V2 6/7]: PVH: balloon and grant changes

On Wed, 2012-10-17 at 01:09 +0100, Mukesh Rathor wrote:
> > >  		gsv.version = 1;
> > >  	else
> > >  		gsv.version = 2;
> > > @@ -1083,12 +1088,24 @@ static void gnttab_request_version(void)
> > >  int gnttab_resume(void)
> > >  {
> > >  	unsigned int max_nr_gframes;
> > > +	char *kmsg = "Failed to kmalloc pages for pv in hvm grant
> > > frames\n"; 
> > >  	gnttab_request_version();
> > >  	max_nr_gframes = gnttab_max_grant_frames();
> > >  	if (max_nr_gframes < nr_grant_frames)
> > >  		return -ENOSYS;
> > >  
> > > +	/* PVH note: xen will free existing kmalloc'd mfn in
> > > +	 * XENMEM_add_to_physmap */
> > 
> > It doesn't leak it?
> > We should consider using xenballoon_alloc_pages here.
> 
> Well, it's a one time allocation of a dozen (iirc) pages, that are 
> returned back to dom heap.

>  We could use xenballoon, but for that we
> need to create vma first so we get the contigous VA,
>  then map each pte
> since xenballoon_ doesn't return contigous pages, and then populate
> physmap. I'm gonna punt it to phase II.  Lets get some working baseline
> in asap.

That's fair enough.


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