[Xen-users] Re: Is there something missing for my NIC passthough?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, May 28, 2010 at 01:16:57AM +0800, lei yang wrote:
>    On Thu, May 27, 2010 at 10:51 PM, lei yang <[1]yanglei.fage@xxxxxxxxx>
>    wrote:
> 
>        > Â  Â my *intent* it to let domU to use "05:00.0" device.
>        >
>        >    boot dom0 with  "pci=resource_alignment=05:00.0
>        > Â  Â xen-pciback.hide=(05:00.0)" appended
>        >
>        > Â  Â my domU config file is
>        >
>        > Â  Â disk = ['tap:aio:/domU.image,xvda1,w',
>        'tap:aio:/domUswap.image,xvda2,w']
>        > Â  Â kernel = "/bzImage"
>        > Â  Â vcpus=2
>        >    vif  = [ "mac=00:15:17:AC:00:40,ip=128.224.165.204" ]
>        > Â  Â root = "/dev/xvda1 ro"
>        > Â  Â extra= "xen console=hvc0"
>        > Â  Â pci = ['05:00.0']
>        >
>        > Â  Â Is there something I missed? eg: my cfg file or other
>        configure? or other
>        > Â  Â steps
>        >
> 
>        Yes, you're missing the required parameters for the domU kernel.
> 
>        See: [2]http://wiki.xensource.com/xenwiki/XenPCIpassthrough
> 
>      Â
>      Â
>      Thanks Pasik "I will add "iommu=soft swiotlb=force"ã**does it add into
>      "domU.cfg" file with
>      Â Â Â  disk = ['tap:aio:/domU.image,xvda1,w',
>      'tap:aio:/domUswap.image,xvda2,w']
>      Â Â Â  kernel = "/bzImage"
>      Â Â Â  vcpus=2
>          vif  = [ "mac=00:15:17:AC:00:40,ip=128.224.165.204" ]
>      Â Â Â  root = "/dev/xvda1 ro"
>      Â Â Â  extra= "xen console=hvc0 iommu=soft swiotlb=force"
>      Â Â Â  pci = ['05:00.0']
>      Â
>      I just want to let domU nic using my pci nic directly. do I need to
>      change my "   vif  = [ "mac=00:15:17:AC:00:40,ip=128.224.165.204" ]"
>      or remove it?
>

You don't need to remove it.. it'll just create a virtual interface 
(xen-netfront)
to the domU. It doesn't conflict with the PCI passthru.


> 
>    Â
>    if I remove "vif  = [ "mac=00:15:17:AC:00:40,ip=128.224.165.204" ]"
>    Â
>    I find I can't find a networking interface
>    Â
>    [3]root@localhost:/root> ifconfig
>    [4]root@localhost:/root> ifconfig eth0 up
>    eth0: ERROR while getting interface flags: No such device
>    [5]root@localhost:/root> ifconfig eth1 up
>    eth1: ERROR while getting interface flags: No such device
>    [6]root@localhost:/root> ifconfig -a
>    lo        Link encap:Local Loopback
>    Â Â Â Â Â Â Â Â Â  LOOPBACKÂ  MTU:16436Â  Metric:1
>    Â Â Â Â Â Â Â Â Â  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>    Â Â Â Â Â Â Â Â Â  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>    Â Â Â Â Â Â Â Â Â  collisions:0 txqueuelen:0
>    Â Â Â Â Â Â Â Â Â  RX bytes:0 (0.0 b)Â  TX bytes:0 (0.0 b)
>    [7]root@localhost:/root> lspci
>    [8]root@localhost:/root>
>    Â
> 

Does your domU kernel have xen-pcifront driver? is it loaded? 
that's required for PCI passthrough to PV guests.

Note that upstream (kernel.org) kernels don't yet have xen-pcifront included.

-- Pasi


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