[Xen-users] Xen4.0.1 cannot VTD hide device

[王宾 <binqbu2002@xxxxxxxxx>]

My Dear:

  I have a VTD problem on Xen4.0.1.of course,I hide a PCI device,which is audio  device:00:1b.0. 
my grub config is this:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-194.el5)
    root (hd0,0)
    kernel /vmlinuz-2.6.18-194.el5 ro root=LABEL=/ rhgb quiet
    initrd /initrd-2.6.18-194.el5.img
title Xen Dom0, kernel 2.6.32.12
    root (hd0,0)
    kernel /xen-4.0.1.gz iommu=1 
    module /vmlinuz-2.6.32.12 root=LABEL=/ ro xen-pciback.hide=(00:1b.0)
    module /initrd-2.6.32.12.img

and  I  reboot to xen4.0.1 and update the HVM config by adding
"pci = [ '00:1b.0' ]"
however,when i excute 
#xend start
#xm create winxp
I found  that it gave the following information:
[root@localhost xen]# xm create winxp
Using config file "./winxp".
Error: Timed out waiting for device model action
[root@localhost xen]# 
What this problem is?

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