linux-kernel - Re: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support

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Message-ID: <20080711203151.GU1678@linux-os.sc.intel.com>
Date:	Fri, 11 Jul 2008 13:31:52 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"steiner@....com" <steiner@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jeremy@...p.org" <jeremy@...p.org>
Subject: Re: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support

On Fri, Jul 11, 2008 at 01:09:57PM -0700, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > > >   http://redhat.com/~mingo/misc/config-Thu_Jul_10_21_43_28_CEST_2008.bad
> > >
> > > Ingo, that was my stupid typo. Please apply this patch. BTW, we need
> > > some more xen64 paravirt fixes in this area. I will look at it as
> > > soon as possible.
> >
> > applied to tip/x86/x2apic - thanks Suresh.
> 
> another problem is the redefinition of apic_read(), causing:
> 
>  arch/x86/xen/enlighten.c: In function ‘xen_patch':
>  arch/x86/xen/enlighten.c:1084: warning: label ‘patch_site' defined but not used
>  arch/x86/xen/enlighten.c: At top level:
>  arch/x86/xen/enlighten.c:1272: error: expected identifier before ‘(' token
>  arch/x86/xen/enlighten.c:1273: error: expected ‘}' before ‘.' token
> 
> with this config:
> 
>   http://redhat.com/~mingo/misc/config-Fri_Jul_11_21_51_18_CEST_2008.bad
> 
> the continued spaghetti in all the APIC variants is quite ugly. This
> should all be handled via a single apic_ops template that should cover
> the paravirt and native variants as well.

Ingo, I just posted the fix for this.

To cleanup the code:

struct pv_apic_ops {
#ifdef CONFIG_X86_LOCAL_APIC
	/*
	* Direct APIC operations, principally for VMI.  Ideally
	* these shouldn't be in this interface.
	*/
	void (*apic_write)(unsigned long reg, u32 v);
	void (*apic_write_atomic)(unsigned long reg, u32 v);
	u32 (*apic_read)(unsigned long reg);

Probably we should move the three above routines to basic apic_ops, which just
deal with the apic HW accesses and retain the below for pv_apic_ops, which
care more than the basic reg accesses. This will be true for both 32/64bits..

        void (*setup_boot_clock)(void);
        void (*setup_secondary_clock)(void);

        void (*startup_ipi_hook)(int phys_apicid,
                                 unsigned long start_eip,
                                 unsigned long start_esp);
#endif
};


Unless there is an objection, I will post the fix.

thanks,
suresh
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