RE: [Xen-devel] Hiding pci devices from dom0 drivers

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

What are your experiences with the reliability of the following
"pciback" script to dynamically "hide" pci devices after boot?

I found it cause system hangs about 50% of the time.

I'm also having some issues with xen0 kernel.  It has e1000 driver as
builtin.  This causes problems since I need to use the latest e1000
driver from sourceforge so I need to modify xen0 linux config to mark
e1000 as "m".

In any case, the path of least resistence for me right now is to come up
with a set of instructions to ask people to download linux-2.6.18-xen.hg
manually, move it to xen-unstable.hg, turn on PCIDEV_BACKEND='y' in
config file, and then do "make install" in xen-unstable.hg.

Let me know if there is a simpler way to do this.

Also

>-----Original Message-----
>From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxxxxx] 
>Sent: Monday, September 24, 2007 1:13 AM
>To: Keir Fraser
>Cc: Kay, Allen M; xen-devel@xxxxxxxxxxxxxxxxxxx; Han, Weidong; 
>You, Yongkang
>Subject: Re: [Xen-devel] Hiding pci devices from dom0 drivers
>
>On Mon, 2007-09-24 at 08:27 +0100, Keir Fraser wrote:
>> On 24/9/07 08:10, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
>> 
>> > Currently we had to manually make the following change in 
>linux config
>> > before building dom0 kernel to enable pciback.hide functionality in
>> > dom0.
>> > 
>> > -CONFIG_XEN_PCIDEV_BACKEND=m
>> > +CONFIG_XEN_PCIDEV_BACKEND=y
>> > 
>> > What do you think about having this change check into your 
>tree so that
>> > we can get rid of this manual step?  If you are ok with 
>it, we can send
>> > you a patch for it.
>> 
>> It's already '=y' in the -xen0 kernel. -xen is a modular 
>kernel config to
>> keep the base kernel a reasonable size. PCI device hiding is still an
>> esoteric option that most users will not use.
>
>You can also get the same effect as pciback.hide entirely from
>userspace:
>
>        # cat pciback 
>        
>        #!/bin/sh
>        
>        if [ $# -eq 0 ] ; then
>           echo "Require a PCI device as parameter"
>           exit 1
>        fi
>        
>        for pcidev in $@ ; do
>            if [ -h /sys/bus/pci/devices/"$pcidev"/driver ] ; then
>        
>                echo "Unbinding $pcidev from" $(basename 
>$(readlink /sys/bus/pci/devices/"$pcidev"/driver))
>                echo -n "$pcidev" > 
>/sys/bus/pci/devices/"$pcidev"/driver/unbind
>            fi
>            echo "Binding $pcidev to pciback"
>            echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/new_slot
>            echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/bind
>        done
>        
>

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