Xen users - Jul 2005 - direct access to ethernet card from domU

Hello,

  I would like to test difference (mostly in performance) between bridged 
ethernet and direct access to ethernet card in xen (2.0.6, kernel 2.4.30-xenU). 
Machine has several on-board ethernet cards, so I can leave one ethernet for 
domO and second for domU.

How can I compile ethernet driver into domU kernel? I have tried
CONFIG_XEN_PHYSDEV_ACCESS=y
CONFIG_NETDEVICES=y
CONFIG_NET_ETHERNET=y
+ethernet driver itself

but when linking vmlinux, I have got


arch/xen/drivers/blkif/drv.o: In function `blkif_connect'':
arch/xen/drivers/blkif/drv.o(.text+0x3601): undefined reference to 
`direct_remap_area_pages''
arch/xen/drivers/netif/drv.o: In function `netif_connect'':
arch/xen/drivers/netif/drv.o(.text+0x3832): undefined reference to 
`direct_remap_area_pages''
arch/xen/drivers/netif/drv.o(.text+0x386f): undefined reference to 
`direct_remap_area_pages''

Does it means that I have to allow also
CONFIG_XEN_PRIVILEGED_GUEST=y

With this I''m able to compile kernel, but is it correct way?

-- 
                   Mirek Ruda

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> but when linking vmlinux, I have got
>
>
> arch/xen/drivers/blkif/drv.o: In function `blkif_connect'':
> arch/xen/drivers/blkif/drv.o(.text+0x3601): undefined reference to
> `direct_remap_area_pages''
> arch/xen/drivers/netif/drv.o: In function `netif_connect'':
> arch/xen/drivers/netif/drv.o(.text+0x3832): undefined reference to
> `direct_remap_area_pages''
> arch/xen/drivers/netif/drv.o(.text+0x386f): undefined reference to
> `direct_remap_area_pages''
>
> Does it means that I have to allow also
> CONFIG_XEN_PRIVILEGED_GUEST=y
>
> With this I''m able to compile kernel, but is it correct way?
Yes.

You could just use the xen0 kernel in your guest, though - then it''d 
automatically support all the same devices that dom0 does.

Cheers,
Mark

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