linux-kernel - Re: [Xen-devel] [PATCH 01/24] arm: initial Xen support

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Message-ID: <alpine.DEB.2.02.1208061142070.4645@kaball.uk.xensource.com>
Date:	Mon, 6 Aug 2012 11:46:14 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Ian Campbell <Ian.Campbell@...rix.com>,
	Rob Herring <robherring2@...il.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"Tim (Xen.org)" <tim@....org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH 01/24] arm: initial Xen support

On Thu, 2 Aug 2012, Konrad Rzeszutek Wilk wrote:
> On Thu, Aug 02, 2012 at 08:35:51AM +0100, Ian Campbell wrote:
> > On Wed, 2012-08-01 at 19:27 +0100, Rob Herring wrote:
> > > On 07/26/2012 10:33 AM, Stefano Stabellini wrote:
> > > > - Basic hypervisor.h and interface.h definitions.
> > > > - Skelethon enlighten.c, set xen_start_info to an empty struct.
> > > > - Do not limit xen_initial_domain to PV guests.
> > > > 
> > > > The new code only compiles when CONFIG_XEN is set, that is going to be
> > > > added to arch/arm/Kconfig in a later patch.
> > > > 
> > > > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > > > ---
> > > >  arch/arm/Makefile                     |    1 +
> > > >  arch/arm/include/asm/hypervisor.h     |    6 +++
> > > >  arch/arm/include/asm/xen/hypervisor.h |   19 ++++++++++
> > > >  arch/arm/include/asm/xen/interface.h  |   64 +++++++++++++++++++++++++++++++++
> > > 
> > > These headers don't seem particularly ARM specific. Could they be moved
> > > to asm-generic or include/linux?
> > 
> > Or perhaps include/xen.
> > 
> > A bunch of it also looks like x86 specific stuff which has crept in.
> > e.g. PARAVIRT_LAZY_FOO and paravirt_get_lazy_mode() are arch/x86
> > specific and shouldn't be called from common code (and aren't, AFAICT).
> 
> The could be moved out..
> 

they are called from grant-table.c; sigh, I was the one to add them there :-(

interface.h is ARM specific, except for the pvclock structs, that in
fact are marked "XXX".

hypervisor.h is almost empty but I guess I could move out the following two
lines:

extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;

Considering that each arch is free to map them (or not) the way it
wants, I don't think is a good idea.
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