Hello all,
It seems to me that when dom0 uses in/out instructions, GP fault will occur, And
Xen will check the io accessing permissions, and then performs the operation for
dom0.
My question is : why not use the io-bitmap which is in TSS, to allow dom0 to
access the physical devices'' IO ports?
As to the mmio, the MMU virtualization can also allow dom0 to map device memory
areas to its virtual memory space, so that there will be no VMM intervence
either.
why the above approaches are not adopted by Xen? Would anyone tell me the
reason?
Thanks a lot.
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