[Xen-devel] direct PIO/MMIO access

[Gábor PÉK <pek@xxxxxxxxx>]

Hi all,

I would like to access the configuration registers of my passthrough
device from my HVM guest under Xen 4.2 via MMIO/PIO directly. Is there
any option for this in the config file of the guest? I know about the
ioports=[''] option for PIO accesses, but is there any way to do the
same with MMIO BAR registers? As far as I know the permissive flag works
only for PV guests. Does the ioports option allow direct access to
config space (0xcf8-0xcfc)? According to in xen/arch/x86/trap.c it is
not allowed.

    /*
     * Port 0xcf8 (CONFIG_ADDRESS) is only visible for DWORD accesses.
     * We never permit direct access to that register.
     */

What about Dom0?

Thank you!
-gabor

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