[Xen-devel] Mini-OS as TPM driver domain

[Wei LIU <liuw@xxxxxxxxx>]

Hi, Xen experts.

We are writing some experiment code to use Mini-OS as a driver domain.

As a proof-of-concept prototype, we try to port TPM driver to Mini-OS.
The driver comes from OSLO (Open Source LOader), which is simple
enough to understand its behavior.

We use TPM-1.2 memory map I/O interface. The problem is that when we
do "read", e.g. read vendor ID, everything just go fine. When we do
"write", e.g. issue a command to hardware, the whole page becomes
0xff.

That's weird. I think I might have some problem mapping I/O memory. I
go through Intel manual, XenoLinux TPM driver code and TIS
specification and couldn't tell why.

How we map those pages:

map_frames_ex(&mfn, 5, 0, 1, 1, DOMID_IO, 0,
L1_PROT|_PAGE_PWT|_PAGE_PCD|_PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_IO);
flush_tlb();

These operations are analogous to XenoLinux ones, I think. You are
welcome to point out my stupid mistakes. And, if mapping is not the
problem, which direction should I head for.

Any reply is appreciated. Thanks!


Wei Liu
July 13, 2010

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