linux-kernel - Re: Possible x2apic breakage

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Date:	Thu, 29 Jan 2009 17:15:46 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jack Steiner <steiner@....com>
Cc:	suresh.b.siddha@...el.com, linux-kernel@...r.kernel.org
Subject: Re: Possible x2apic breakage


* Jack Steiner <steiner@....com> wrote:

> Suresh -
> 
> This popped up in Ingo's x86 tree yesterday. This appears to be breaking
> on our simulator running in x2apic mode. If I understand the code,
> this is a real breakage and not a problem in our simulator:
> 
> 
> arch/x86/include/asm/genapic.h
> 
> 	static inline unsigned int read_apic_id(void)
> 	{
>         	unsigned int reg;
> 
>         	reg = *(u32 *)(APIC_BASE + APIC_ID);
>         	return apic->get_apic_id(reg);
> 	}
> 
> 
> As expected, the failure occurs right after:
> 
> 	Enabling x2apic
> 	Enabled x2apic and interrupt-remapping
> 
> The next reference to apicid tries to read from mem instead of MSRs.

yes - Suresh sent a fix earlier today. Could you please check latest 
tip/master (v2.6.29-rc3-1212-g69f3c6d or later), does it work fine in your 
simulator?

And i'll also merge struct apic_ops into struct genapic - now that genapic 
is unified there's no reason for the two to be separate.

	Ingo
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