Messages in this thread | | | From | "Zhang, Lin-Bao (Linux Kernel R&D)" <> | 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 | Thu, 11 Oct 2012 16:46:29 +0000 |
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> -----Original Message----- > From: Suresh Siddha [mailto:suresh.b.siddha@intel.com] > Sent: 2012年10月10日 18:02 > > > 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 for your explanation and confirm, I also consulted BIOS guys , yes, interrupt will be dropped , software didn't see them,and don't go to handle them. So we OS don't need to disable 8259A interrupt during the window , only if 2.6.32 has applied your patch(triggered some actions to mask IO-apic) That's good. Perfect design . thanks.
Here we go!
--------------- -- Bob(LinBao Zhang) HP linux kernel enginner
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