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On Sat, Dec 8, 2012 at 9:20 AM, Paul Pridt <p.pridt@xxxxxxxxx> wrote:

Hi,
first let me thank for your replies.
Further to your notes I did some investigation and tests, but was not successful.
I am fairly familiar on pci-passthrough in xm or xl toolstack.
I assigned the adapter in question to pciback, entered the other-config parameters and started the vm, but the vm did not see the drive.
Looking at the tutorial on XCP_Ubuntu_PCIPassthrough I found that the author references the xl command which is not available when you install the cp-xapi in Ubuntu and set the toolstack to xapi. Both xe and xl commands are available in XCP-Server, but there the udev SRs work anyway.

I also tried to create the udev SR:
xe sr-create content-type=disk name-label=”Removable storage” type=udev device-config:location=/dev/xapi/block
The answer was:
The SR could not be connected because the driver was not recognised.
driver: udev
It seems that there is some task needed that creates /dev/xapi/block ..
I think if I were successful on the latter task I could create the vdi manually and attach it to the vm.
I will furter investigate ...
Regards 
Paul
Am 07.12.2012 16:45, schrieb Gizmo Chicken:
Grant,

I had nearly finished drafting my reply to Paul when I noticed your reply.

As mentioned in my reply to Paul, I suspect that what Paul wants to do (passthrough a USB device) could be accomplished via PCI passthrough (of an entire USB controller) to an HVM guest. Does that sound right?

As I also mentioned in my reply to Paul, another poster (Donald van der Wurf) attempted to adapt a tutorial found at http://wiki.xen.org/wiki/XCP_Ubuntu_PCIPassthrough to his goal of configuring PCI passthrough to an HVM guest in XCP. However, the original poster wasn't successful, and so sought help from the group.

Your technical knowledge is clearly way beyond mine. If you feel that it would be possible to configure PCI passthrough to an HVM guest in XCP, would you consider creating a brief tutorial, or possibly extending the above mentioned tutorial, to describe the procedure?

Any help from you (or others) would be greatly appreciated.

Best regards,
GizmoChicken

---------- Forwarded message ----------
From: Gizmo Chicken <gizmochicken@xxxxxxxxx>
Date: Fri, Dec 7, 2012 at 10:00 AM
Subject: Re: [Xen-API] Attach CD or Removable Devices
To: Paul Pridt <p.pridt@xxxxxxxxx>
Cc: xen-api@xxxxxxxxxxxxx

Paul,

I suspect that what you want to do could be accomplished via PCI passthrough to an HVM guest, which is the subject of a thread having the subject "[Xen-API] XCP PCI Passthrough on HVM how to?" that was started a few weeks ago. So you might want to follow (and perhaps join in) that thread.

Without repeating the entirety of the above mentioned thread, I'll note that the original poster referenced a tutorial found at http://wiki.xen.org/wiki/XCP_Ubuntu_PCIPassthrough addressing PCI passthrough to a PV guest in XCP. However, the original poster wasn't able to adapt that tutorial to his goal of configuring PCI passthrough to an HVM guest in XCP, and so sought help from the group.

Unlike the situation with the XAPI toolstack, the procedure for configuring PCI passthrough to an HVM guest is relatively straightforward with Xen when using the default toolstack. For a discussion of both VGA and PCI passthrough in Xen when using the default toolstack, see http://forums.linuxmint.com/viewtopic.php?f=42&t=112013.

So if you don't mind leaving behind the comforts of XenCenter for something like Virtual Machine Manager (virt-manager), maybe Xen and its default toolstack is a better option for you.

I wish that I could be of more help.

Best regards,
GizmoChicken

P.S. I'm currently using Xen (and Virtual Machine Manager), but I would switch to XCP (and XenCenter) if I could get PCI passthough working in XCP. In such a case, I would passthrough nearly all of my USB controllers, along with a second PCI video card, to an HVM guest running Ubuntu desktop. That way I could have, on a single machine, both a stable XCP server (which I could leave up 24/7 to host my virtual servers) and also local access to virtual machine having fully functional desktop (which I could shut down when not in use). I imagine that many would apprciate such functionality in XCP, so let's hope that the developers consider adding such a feature to future releases of XCP if not already possible via xe command line.

On Fri, Dec 7, 2012 at 9:50 AM, Grant McWilliams <grantmasterflash@xxxxxxxxx> wrote:

On Fri, Dec 7, 2012 at 3:18 AM, Paul Pridt <p.pridt@xxxxxxxxx> wrote:

Hi,
I am looking for a way to attach a physical CD drive or a USB-attached hard drive to a VM.
I know that Citrix Xenserver does that through special udev-SRs. There you even can attach an internal hard drive with the help of an udev rule that creates the vdi.
Has anybody a running solution?
My system is Ubuntu 12.04 with xcp-xapi.

--
Regards,
Paul

What is it exactly you're trying to accomplish? I'd start by checking /etc/udev/rules.d/58-xapi.rules for events and check the scripts that it runs.

58-xapi.rules

# Skip devices which fail the local sharing check (to filter out root/mounted devices)

ACTION="" PROGRAM!="/opt/xensource/libexec/check-device-sharing %k", GOTO="end_xapi"

ACTION="" SYMLINK+="xapi/block/%k"

ACTION="" RUN+="/bin/sh -c '/opt/xensource/libexec/local-device-change %k 2>&1 >/dev/null&'"

ACTION="" RUN+="/bin/sh -c '/opt/xensource/libexec/local-device-change %k 2>&1 >/dev/null&'"

Part of /opt/xensource/libexec/local-device-change

for SR in `xe sr-list type=udev sm-config:type=block uuid=${LOCAL_SR} params=uuid --minimal`

do

xe vdi-introduce uuid=`uuidgen` sr-uuid=${SR} type=user location=/dev/xapi/block/${DEVICE}

done

Read the whole scripts of course but this might get you started.

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Re: [Xen-API] Fwd: Attach CD or Removable Devices