Re: [Xen-users] Hiding PCI devices with modprobe.d

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Mon, 17 Jun 2013 08:59:53 -0500, David Sutton <kantras@xxxxxxxxx> 
wrote:
> Daniel,
>
> On Mon, Jun 17, 2013 at 5:25 AM, Daniel Shub  wrote:
>
> I am running Xen 4.2 with the XL toolstack on Arch Linux. I have a 
> set
> of PCI devices that I am trying to hide. From the command line I can
> hide the devices with
>
> Â
>
> ÂÂÂ # xl pci-assignable-add 01:00.0
>
> ÂÂÂ # xl pci-assignable-add 01:00.1
>
> ÂÂÂ # xl pci-assignable-add 02:00.0
>
> ÂÂÂ # xl pci-assignable-add 03:00.0
>
> Â
>
> and confirm they are hidden with
>
> Â
>
> ÂÂÂ # xl pci-assignable-list
>
> Â
>
> I wanted to automate this so I created a file called
> /etc/modprobe.d/pcihide.conf and included
>
> Â
>
> Â ÂÂoptions xen-pciback hide=(01:00.0)(01.00.1)(02:00.0)(03:00.0)
>
> Â
>
> When I reboot only some of the devices are hidden. Looking in dmesg
> and xl dmesg I can see entries for the devices that are successfully
> hidden, but no obvious entries for the devices that are not hidden. 
> If
> I remove the /etc/modprobe.d/pcihide.conf file and reboot, no devices
> are hidden, so the file is getting loaded and I am able to hide some
> devices with this method.
>
> Â
>
> I am unable to hide a built in SATA controller, two built in USB 2.0
> controllers, two built in USB 3.0 controllers, and an add on SATA 
> card
> with the modprobe.d file. I am able to hide two add on video
> cards(with HDMI audio) and a TV tuner card with the modprobe.d file. 
> I
> can hide all the devices with xl pci-assignable-add.
>
> Â
>
> Is using a Âmodprobe.d file the right way to hide PCI devices on
> boot? If so, I know this isnât a lot to work with, but where should
> I be looking for information about what is going wrong?
>
> I'm also using Arch Linux, with xen-4.2.2. The way I tackled this
> problem is moved the loading of xen-pciback into the initrd, so that
> it would load before any of the other modules. In order to do this,
> edit your /etc/mkinitcpio.conf and make the following changes:
>
> * Add 'xen-pciback' into the MODULES array. This will make sure that
> the module is included in the initrd.
>
> * Add 'modconf' into the 'HOOKS' array . This will make sure that all
> the files in /etc/modprobe.d/ get included in the initrd.
>
> The only other thing I did was use the same name as the module for my
> modprobe.d file:
>
> $ cat /etc/modprobe.d/xen-pciback.conf
> options xen-pciback
> hide=(0000:06:00.1)(0000:06:00.0)(0000:00:12.2)(0000:00:12.0)
That is a reasonably neat solution, but it does come with the drawback
that you have to rebuild your initrd every time you need to change
the devices you need to pass through. Granted, though, that
probably won't happen much outside of a testing environment.

Gordan

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