[Xen-devel] Prevent guest OSes from accessing paricular memory locations

[limp <johnkyr83@xxxxxxxxxxx>]

Hi all,

 

This is my first post on the list so please bare with me!

 

I would like to use Xen hypervisor for running a Linux guest but I want to prohibit Linux from accessing (i.e. writing to) some physical memory locations in which registers of some x86 peripherals are located in. For instance, I would like to prevent Linux (not only the Linux kernel code but anyone who tries to access these I/O ports and memory mapped registers by e.g. writing a kernel module, etc.) from accessing I/O ports 3F8h – 3FFh (serial port 1) and HPET memory mapped registers at 0xFED00000 - 0xFED003FF.

 

Is it possible Xen to redirect these accesses to a printf displaying for instance a message saying “The access to this memory location is not allowed” or just ignore them?

 

Please have a look at http://img209.imageshack.us/img209/4431/linuxmoduleaccessesproh.gif for a graphical overview of what I want to achieve.

 

Any help will be much appreciated.

 

Kind Regards,

 

Ioannis.

 

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