linux-kernel - Re: [PATCH v13 15/19] xen/grant-table: Refactor gnttab

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Date:	Sun, 5 Jan 2014 14:33:12 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com, hpa@...or.com
Subject: Re: [PATCH v13 15/19] xen/grant-table: Refactor gnttab_init

On Sun, Jan 05, 2014 at 06:18:03PM +0000, Stefano Stabellini wrote:
> On Fri, 3 Jan 2014, Konrad Rzeszutek Wilk wrote:
> > We have this odd scenario of where for PV paths we take a shortcut
> > but for the HVM paths we first ioremap xen_hvm_resume_frames, then
> > assign it to gnttab_shared.addr. This is needed because gnttab_map
> > uses gnttab_shared.addr.
> > 
> > Instead of having:
> > 	if (pv)
> > 		return gnttab_map
> > 	if (hvm)
> > 		...
> > 
> > 	gnttab_map
> > 
> > Lets move the HVM part before the gnttab_map and remove the
> > first call to gnttab_map.
> > 
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > Reviewed-by: David Vrabel <david.vrabel@...rix.com>
> 
> As I wrote in my reply to the previous version of the patch, you can
> have my acked-by, except for the spurious code style fix mixed-up with
> the other changes.

Thanks. I fixed it up (removed the code style fix).

> 
> 
> >  drivers/xen/grant-table.c | 13 ++++---------
> >  1 file changed, 4 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> > index 99399cb..cc1b4fa 100644
> > --- a/drivers/xen/grant-table.c
> > +++ b/drivers/xen/grant-table.c
> > @@ -1173,22 +1173,17 @@ static int gnttab_setup(void)
> >  	if (max_nr_gframes < nr_grant_frames)
> >  		return -ENOSYS;
> >  
> > -	if (xen_pv_domain())
> > -		return gnttab_map(0, nr_grant_frames - 1);
> > -
> > -	if (gnttab_shared.addr == NULL) {
> > +	if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr == NULL)
> > +	{
> >  		gnttab_shared.addr = xen_remap(xen_hvm_resume_frames,
> > -						PAGE_SIZE * max_nr_gframes);
> > +					       PAGE_SIZE * max_nr_gframes);
> >  		if (gnttab_shared.addr == NULL) {
> >  			pr_warn("Failed to ioremap gnttab share frames (addr=0x%08lx)!\n",
> >  					xen_hvm_resume_frames);
> >  			return -ENOMEM;
> >  		}
> >  	}
> > -
> > -	gnttab_map(0, nr_grant_frames - 1);
> > -
> > -	return 0;
> > +	return gnttab_map(0, nr_grant_frames - 1);
> >  }
> >  
> >  int gnttab_resume(void)
> > -- 
> > 1.8.3.1
> > 
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