Messages in this thread | | | 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 ) | From | Suresh Siddha <> | Date | Wed, 10 Oct 2012 17:01:39 -0700 |
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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
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