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 )

[Suresh Siddha <suresh.b.siddha@intel.com>]

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