sabled DMA prefetch for quite some time. Testing with XEN revealed another ASIC bug. If dom0 resides on a P600 the board can can an MCA bi accessing invalid memory addresses. Apparently, we need to disable both prefetch and refetch. My understanding is a refetch operation should not occur but it is a valid thing to do if prefetched data is no longer available for whatever reason. Please consider this patch for inclusion. Signed-off-by: Mike Miller Signed-off-by: Alex Chiang -------------------------------------------------------------------------------- Signed-off-by: Jens Axboe ú @Ñ—