WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-users] XCP: PCI pass through Howto

To: 'James Troup' <james@xxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] XCP: PCI pass through Howto
From: Dave Scott <Dave.Scott@xxxxxxxxxxxxx>
Date: Thu, 25 Feb 2010 13:41:01 +0000
Accept-language: en-US
Acceptlanguage: en-US
Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Thu, 25 Feb 2010 05:42:13 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <6290311.60.1267053905323.JavaMail.root@zimbra5>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <10565731.57.1267050569567.JavaMail.root@zimbra5> <6290311.60.1267053905323.JavaMail.root@zimbra5>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Acq1qKmwvbQBAtnkTOS+hcu1sPljKQAdyVjQ
Thread-topic: [Xen-users] XCP: PCI pass through Howto

Hi James,

 

Loading the pciback module in dom0 was the right thing to do. I think this is automatically loaded in newer builds, so when I next refresh the .isos that step shouldn’t be necessary.

 

Looking at your domU kernel dmesg it looks like you’re missing a set of PV drivers: netfront, blkfront and pcifront. What domU kernel version are you using?

 

There are no immediate plans to add USB passthrough to XCP. It think passing through the controller (as you’re attempting to do) is your best bet.

 

Cheers,

Dave

 

From: James Troup [mailto:james@xxxxxxxxxxxxxxxxx]
Sent: 24 February 2010 23:25
To: Dave Scott
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] XCP: PCI pass through Howto

 

Hi Dave,

Here is the output when I attempt PCI passthrough...

[20100224T21:39:31.973Z|debug|lts-xen1|5228 unix-RPC|VM.start R:6a8f8407bbc4|xenops] pci: unbounding device 0000:00:12.0 from driver ohci_hcd
[20100224T21:39:31.975Z|debug|lts-xen1|5228 unix-RPC|VM.start R:6a8f8407bbc4|helpers] Ignoring exception: INTERNAL_ERROR: [ Unix.Unix_error(20, "open", "/sys/bus/pci/drivers/pciback/new_slot") ] while attach_pcis

Noted that "/sys/bus/pci/drivers/pciback" directory did not exist.  Is it supposed to be created by this action?

...after poking around a bit I realized you would need the pciback module loaded.

So the xensource.log now reveals...

 [20100224T22:21:20.182Z|debug|lts-xen1|5857 unix-RPC|VM.start R:49d16bf207f8|xenops] Doing FLR on pci device: 0000:00:12.0
[20100224T22:21:20.193Z|debug|lts-xen1|5857 unix-RPC|VM.start R:49d16bf207f8|xenops] pci add mem bar fe02e000-fe02efff
[20100224T22:21:20.193Z|debug|lts-xen1|5857 unix-RPC|VM.start R:49d16bf207f8|xenops] adding device  B0[/local/domain/0/backend/pci/23/0]  F23[/local/domain/23/device/pci/0]  H[/xapi/23/hotplug/pci/0]


There is nothing attached to the PCI device.

Inside the domU dmesg reveals...

[    0.004928] Booting paravirtualized kernel on Xen
[    0.004930] Xen version: 3.4.2 (preserve-AD)
[    0.005132] Grant table initialized
[    0.005135] regulator: core version 0.5
[    0.005214] NET: Registered protocol family 16
[    0.005425] PCI: Fatal: No config space access function found
[    0.005425] bio: create slab <bio-0> at 0
[    0.005425] ACPI: Interpreter disabled.
[    0.005425] xen_balloon: Initialising balloon driver.
[    0.008183] PCI: System does not support PCI
[    0.008185] PCI: System does not support PCI
[    0.008374] pnp: PnP ACPI: disabled
[    0.008376] PnPBIOS: Disabled
[    0.008799] NET: Registered protocol family 2
[    0.008869] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.009068] TCP established hash table entries: 8192 (order: 4, 65536 bytes)
[    0.009094] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.009119] TCP: Hash tables configured (established 8192 bind 8192)
[    0.009122] TCP reno registered
[    0.009180] NET: Registered protocol family 1

[    0.039675] XENBUS: Device with no driver: device/vbd/51776
[    0.039678] XENBUS: Device with no driver: device/vbd/51712
[    0.039680] XENBUS: Device with no driver: device/vif/0
[    0.039682] XENBUS: Device with no driver: device/pci/0


Is there USB passthrough in the pipeline?
I am actually trying to pass the USB controller.


Thanks for the help,
James

----- Original Message -----
From: "Dave Scott" <Dave.Scott@xxxxxxxxxxxxx>
To: "James Troup" <james@xxxxxxxxxxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Thursday, 25 February, 2010 5:00:10 AM
Subject: RE: [Xen-users] XCP: PCI pass through Howto


Hi James,

 

That should be it… but it is a bit experimental J

 

The device should be hidden from dom0 when the VM is started. I imagine this might fail if the device is in use.

 

I last tested it with HVM (SLES10 IIRC) on a VT-d system, after adding ioemmu=1 onto the xen commandline (it’s not the default). It ought to work with PV as-is.

 

Could you give more details about what you tried? You might find useful information in /var/log/xensource.log, especially if you grep for “PCI”.

 

Cheers,

Dave

 

From: James Troup [mailto:james@xxxxxxxxxxxxxxxxx]
Sent: 24 February 2010 12:58
To: Dave Scott
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] XCP: PCI pass through Howto

 

Hi Dave,
is there any more to it than that?

Do I have to hide the device from, dom0.

I tried as you suggested but I cannot see the device in domU

Am I missing something?

Does this rely on VT-d ?
Does it only apply to HVM?

Thanks,
James

----- Original Message -----
From: "Dave Scott" <Dave.Scott@xxxxxxxxxxxxx>
To: "James Troup" <james@xxxxxxxxxxxxxxxxx>
Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, 24 February, 2010 8:33:22 PM
Subject: RE: [Xen-users] XCP: PCI pass through Howto

Hi,

 

The only documentation is currently in the code L

 

Try a command like:

 

xe vm-param-set uuid=<uuid> other-config:pci=0/0000:00:00:0

 

and then start the VM. (Change that PCI bus path to be the one you actually want to use)

 

http://xenbits.xen.org/xapi/xen-api.hg?file/a8decf9d3bee/ocaml/xapi/vmops.ml (line 483, pcidevs_of_vm)

 

Cheers,

Dave

 

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Troup
Sent: 24 February 2010 07:18
To: xen-users
Subject: [Xen-users] XCP: PCI pass through Howto

 

Hi,
where can I find out about the experimental PCI pass-through in XCP?

I do not seem to be able to find any documentation.

Thanks.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users