linux-kernel - Re: [PATCH 02/18] xen: hook io

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Date:	Sat, 9 May 2009 10:43:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 02/18] xen: hook io_apic read/write operations


* Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> 
> > --- a/arch/x86/kernel/apic/io_apic.c
> > +++ b/arch/x86/kernel/apic/io_apic.c
> > @@ -62,8 +62,10 @@
> >  #include <asm/uv/uv_hub.h>
> >  #include <asm/uv/uv_irq.h>
> >  
> > +#include <asm/xen/hypervisor.h>
> >  #include <asm/apic.h>
> >  
> > +
> >  #define __apicdebuginit(type) static type __init
> >  
> >  /*
> > @@ -407,14 +409,26 @@ static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
> >  
> >  static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
> >  {
> > -	struct io_apic __iomem *io_apic = io_apic_base(apic);
> > +	struct io_apic __iomem *io_apic;
> > +
> > +	if (xen_initial_domain())
> > +		return xen_io_apic_read(apic, reg);
> 
> hm, any reason why we dont want to create a 'struct io_apic' 
> driver abstraction instead of spreading xen_initial_domain() 
> checks all around the code?

And on a higher level, i still dont see why you dont do the whole 
Xen thing under an irqchip. There should be no extra crappy checks 
in native code.

	Ingo
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