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xen-devel
RE: [Xen-devel] Memory Mapped IO devices in a domU
> How would one pass a memory mapped device to a domU? In particular I'm
> trying to pass the TPM to a domU. It is a memory mapped device with 5
> pages starting at 0xfed40000.
You probably actually want to pass locality 0 through to the guest, which is
one page starting at 0xfed40000.
You can do this by adding the relevant mmio passthrough option to the domain
config file [I forget the actual name].
The easiest way to ensure you're not using the device in dom0 is just not to
load the TPM driver. Alternatively, modify the dom0 driver to use another TPM
locality e.g. 1 (the page above).
Ian
> Currently I'm playing with the memory_op hypercall, using
> XENMEN_add_to_phys but its failing and I'm currently investigating why.
> Is this even the right hypercall to use for this? How do I deal with the
> fact that the device is already mapped into dom0 by default? Do I need to
> explicitly unmap the pages from dom0 first somehow?
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