linux-kernel - RE: [PATCH] fix x2apic defect that Linux kernel doesn't mask 8259A interrupt during the time window between changing VT-d table base address and initializing these VT-d entries(smpboot.c and apic.c )

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Message-ID: <1349914040.3042.12.camel@sbsiddha-desk.sc.intel.com>
Date:	Wed, 10 Oct 2012 17:07:19 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"Zhang, Lin-Bao (Linux Kernel R&D)" <linbao.zhang@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"Croxon, Nigel" <nigel.croxon@...com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"Sakkinen, Jarkko" <jarkko.sakkinen@...el.com>,
	"joerg.roedel@....com" <joerg.roedel@....com>,
	"agordeev@...hat.com" <agordeev@...hat.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"stable@...nel.org" <stable@...nel.org>
Subject: RE: [PATCH] fix x2apic defect that Linux kernel doesn't mask 8259A
 interrupt during the time window between changing VT-d table base address
 and initializing these VT-d entries(smpboot.c and apic.c )

On Wed, 2012-10-10 at 00:26 +0000, Zhang, Lin-Bao (Linux Kernel R&D)
wrote:

> So , we can think ,as your patch , during the window , IO-apic is
> useless or we can think IO-APIC doesn't exist ? 
> Could you mind please sharing your design details ? thanks very much! 

Between the window of interrupt-remapping enabled and the masked IO-APIC
RTE's are configured properly, linux kernel doesn't wait/depend on any
external interrupts.

> > Can you please apply the appended patch to 2.6.32 kernel and see if the issue
> > you mentioned gets fixed? If so, we can ask the -stable and OSV's teams to
> > pick up this fix.
> Yes , it can resolve current issue. 

Thanks for testing it out.

I will add the appropriate changelog and send the patch out (to 2.6.32
stable and OSV kernels) with your "Tested-by:" if you are ok.

thanks,
suresh

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