linux-kernel - Re: [Xen-devel] [PATCH V2 2/7]: PVH: use native irq, enable callback, use HVM ring ops, ...

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Date:	Tue, 16 Oct 2012 15:11:08 -0700
From:	Mukesh Rathor <mukesh.rathor@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.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 2/7]: PVH: use native irq, enable
 callback, use HVM ring ops, ...

On Mon, 15 Oct 2012 09:58:17 +0100
Ian Campbell <Ian.Campbell@...rix.com> wrote:

> On Fri, 2012-10-12 at 20:06 +0100, Mukesh Rathor wrote:
> > On Fri, 12 Oct 2012 09:52:17 +0100
> > Ian Campbell <Ian.Campbell@...rix.com> wrote:
> > 
> > > >  drivers/xen/cpu_hotplug.c            |    4 +++-
> > > >  drivers/xen/events.c                 |    9 ++++++++-
> > > >  drivers/xen/xenbus/xenbus_client.c   |    3 ++-
> > > >  7 files changed, 27 insertions(+), 8 deletions(-)
> > > > 
> > > union {
> > > 	struct {
> > > 		unsigned long gdt_frames[16], gdt_ents;
> > > 	} pv;
> > > 	struct {
> > > 		unsigned long gdtaddr, gdtsz;
> > > 	} pvh;
> > > } gdt;
> > > 
> > > (I've gone with naming the union gdt instead of u. You might want
> > > therefore to also drop the gdt prefix from the members?)
> > 
> > Is it worth it, I mean, making it a union. Would you be OK if I just
> > used gdt_frames[0] and gdt_ends for gdtaddr and size?
> 
> What's the problem with making it a union? Seems like you are 80% of
> the way there.

No problem. It resutls in a patch on xen side too. I'll send that too.

> units AFAICT and so can be combined.
> 
> How come you don't need the same stuff for ldt*?

Happens natively. Isn't PVH great!

thanks
mukesh
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