Fedora xen - Mar 2006 - Problems to hide pci appliance

Hi People,

I''ve problems when I want to use a pci device within a guest machine. I
try modify grub.conf and put physdev_dom0_hide and pciback.hide in the 
line of kernel and module but it does not happen anything.

Somebody knows the way to make this?

Thanks a lot

Victor :-)