Re: [Xen-users] PCI Passthrough on VTd Enabled Board

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Phil Winterfield (winterfi) wrote:
> I am trying to run a paravirtualized guest OS and use the split driver 
> model on an Intel board with VTd enabled. When I set up the device 
> passthrough as per the xen wiki 
> (http://wiki.xensource.com/xenwiki/VTdHowTo), I find that the device 
> still shows up in dom0 and does not get passed into my guest OS.  The 
> xenbus read returns not found for xen-3.0-x86_32p/backend-id.
>  
>
> Can you see anything missing below?
>
>  
>
> _lspci:_
>
>  
>
> [root@localhost phil]# lspci
>
> .
>
> .
>
> 01:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit 
> Ethernet Controller (rev 06)
> 01:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit 
> Ethernet Controller (rev 06)
> 02:00.0 Ethernet controller: Intel Corporation 82557/8/9 Ethernet Pro 
> 100 (rev 09)
>  
>
> _from grub.conf_
>
>  
>
> title Xen-Fedora Core (2.6.18-xen)
>
>         root (hd0,0)
>
>         kernel /xen.gz com1=115200,8n1 console=com1
>
>         module /vmlinuz-2.6.18.8-xen root=LABEL=/ ro xencons=ttyS 
> console=tty0 console=ttyS0, pciback.hide=(01:00.0)(01:00.1)
Most distributions do not compile pciback module statically to the 
kernel, but as a module. If the pciback support is compiled as a module, 
adding pciback.hide=(blah)(blah) to kernel is useless. You have to do 
that in your modprobe.conf and reboot to take that into effect. I do 
something like the below one in my modprobe.conf.
install bnx2 /sbin/modprobe pciback ; /sbin/modprobe --first-time 
--ignore-install bnx2
options pciback hide=(0000:09:00.0) verbose_request=1

Obviously make changes wherever required. If pciback is compiled 
statically to your kernel, your configuration is correct.
--Sadique

>         module /initrd-2.6.18-xen.img
>
>  
>
>  
>
> _from /etc/xen/pv.conf_
>
> pci = [ '01:00.0', '01:00.1' ]
>
>  
>
>  
>
> _from guest OS console_:
>
>  
>
> ************************ NETFRONT for xen-3.0-x86_32p **********
>
> net TX ring size 256
>
> net RX ring size 256
>
> Failed to read xen-3.0-x86_32p/backend-id.
>
> Thread "netfront" exited.
>
>  
>
> ******************* PCIFRONT for device/pci/0 **********
>
> Failed to read device/pci/0/backend-id.
>
> Error ENOENT when reading the backend path device/pci/0/backend
>
> Thread "pcifront" exited.
>
>  
>
>  
>
> ------------------------------------------------------------------------
>
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