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ebdd477d44
CD drives in PIO mode don't work under Xen because of a change in Linux between 2.6.12 and 2.6.16, as a result of the following thread: http://lists.parisc-linux.org/pipermail/parisc-linux/2005-August/027197.html The change breaks systems which have highmem and a swiotlb because the ide-cd driver doesn't use the swiotlb, resulting in read/writes to/from highmem pages in PIO mode not working any longer. Xen kernels usually have both highmem and a swiotlb. Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>