Xen devel - Oct 2012 - error: xl pci-attach assign pci to vm

Hi all
       Now I''m dong the sriov on the xen 4.1
       when I try to do the following cmd: 
       I got some errors like below:
       # xl pci-attach 7 0000:03:10.2
       libxl: error: libxl_pci.c:750:libxl_device_pci_reset The kernel
doesn''t support reset from sysfs for PCI device 0000:03:10.2
       libxl: error: libxl_device.c:470:libxl__wait_for_device_model Device
Model not ready


       what''s wrong?
       The guest os I''m using is Centos 6.3, hvm type, I have already
installed the pv-drivers for it. when I execute lspci in the vm, it looks no
problem.
       what''s wrong, please help, thanks.



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On Sat, 2012-10-13 at 10:20 +0100, topperxin wrote:
> Hi all
>        Now I''m dong the sriov on the xen 4.1
xl''s pci passthrough support in 4.1 is a bit flakey. I recommend you
either use xend with 4.1 or upgrade to 4.2 where xl works pretty well.

Ian.