Tough Issue: kernel instruction corruption

[Gavin Shan]

Hello, I'm faced a tough issue recently: instructions of kernel
were corrupted. There has 2 PCI buses on my board and lots
of PCI devices with DMA capabality involved. I'm suspecting
the kernel instructions were corrupted by DMA operations driving
by those PCI devices with DMA capabality. 

Anybody have tried to protect kernel instructions from this case
or have any ideas to protect kernel text section?

Thanks in advance,
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