Re: [Xen-devel] Q on ioctl support in netfront/netback

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Feb 17, 2010 at 08:19:14AM -0800, ravi kerur wrote:
>    Hi Konrad,
> 
>    Using PCI passthrough(I believe it is via config file changes) prevents
>    other domU's accessing the NIC correct? If I use it, would the network
>    transmit/receive still happen via netfront/netback drivers?
> 

No. If you use PCI passthrough then the domU uses the real driver for the nic
that would also be used on baremetal or in dom0.

PCI passthrough for a NIC is only possible to one/single domU, per PCI device.

(Some multiport NICs show up as a multiple PCI devices, which allows you to 
passthrough different ports to different domUs).

-- Pasi

>    Thanks
>    -RK
> 
>    On Tue, Feb 16, 2010 at 10:14 AM, Konrad Rzeszutek Wilk
>    <[1]konrad.wilk@xxxxxxxxxx> wrote:
> 
>      On Mon, Feb 15, 2010 at 07:54:02AM -0800, ravi kerur wrote:
>      > Paul,
>      >
>      > Registers are not in netback, they are h/w registers on NIC and the
>      driver
>      > supports reads/writes via ioctl calls. Driver is in dom0 and
>      application
>      > which reads/writes registers is run in domU.
> 
>      You could use PCI passthrough. This way the NIC would be visible in your
>      DomU and you could fiddle with the registers.
> 
> References
> 
>    Visible links
>    1. mailto:konrad.wilk@xxxxxxxxxx

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