From: Suresh Siddha <suresh.b.siddha@intel.com>
To: "Zhang, Lin-Bao (Linux Kernel R&D)" <linbao.zhang@hp.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"alan@lxorguk.ukuu.org.uk" <alan@lxorguk.ukuu.org.uk>,
"mingo@redhat.com" <mingo@redhat.com>,
"Croxon, Nigel" <nigel.croxon@hp.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"hpa@zytor.com" <hpa@zytor.com>,
"x86@kernel.org" <x86@kernel.org>,
"a.p.zijlstra@chello.nl" <a.p.zijlstra@chello.nl>,
"Sakkinen, Jarkko" <jarkko.sakkinen@intel.com>,
"joerg.roedel@amd.com" <joerg.roedel@amd.com>,
"agordeev@redhat.com" <agordeev@redhat.com>,
"yinghai@kernel.org" <yinghai@kernel.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 )
Date: Wed, 10 Oct 2012 17:01:39 -0700 [thread overview]
Message-ID: <1349913700.3042.7.camel@sbsiddha-desk.sc.intel.com> (raw)
In-Reply-To: <92645B27BF79D04FBD2B0F8494FFD0F9102841@G2W2429.americas.hpqcorp.net>
On Wed, 2012-10-10 at 16:02 -0700, Zhang, Lin-Bao (Linux Kernel R&D)
wrote:
> > As I mentioned earlier, the current design already ensures that all the IO-APIC
> > RTE's are masked between the time we enable interrupt-remapping to the time
> > when the IO-APIC RTE's are configured correctly.
> >
> > So I looked at why you are seeing the problem with v2.6.32 but not with the
> > recent kernels. And I think I found out the reason.
>
> I want to know what masking IO-APIC means?
As the platform is configured to use virtual-wire B and the
corresponding IO-APIC RTE is masked, that interrupt will be dropped.
thanks,
suresh
next prev parent reply other threads:[~2012-10-11 0:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-08 4:53 [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 ) Zhang, Lin-Bao (Linux Kernel R&D)
2012-10-08 23:57 ` Suresh Siddha
2012-10-10 0:26 ` Zhang, Lin-Bao (Linux Kernel R&D)
2012-10-11 0:07 ` Suresh Siddha
2012-10-11 3:52 ` Zhang, Lin-Bao (Linux Kernel R&D)
2012-10-11 5:26 ` H. Peter Anvin
2012-10-11 15:32 ` Zhang, Lin-Bao (Linux Kernel R&D)
2012-10-10 23:02 ` Zhang, Lin-Bao (Linux Kernel R&D)
2012-10-11 0:01 ` Suresh Siddha [this message]
2012-10-11 16:46 ` Zhang, Lin-Bao (Linux Kernel R&D)
-- strict thread matches above, loose matches on Subject: below --
2012-09-21 7:20 Zhang, Lin-Bao (Linux Kernel R&D)
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