RE: [Xen-devel] Possible BUG: starting more than 1 domain with same pci= passthrough device

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Yes, this is a known issue (please see the attached mail).

I have no time to fix it for now. :-(  Hope somebody can kindly help.

Thanks,
-- Dexuan

 

---

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Tim Moore
Sent: Tuesday, April 14, 2009 2:49 AM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Possible BUG: starting more than 1 domain with same pci= passthrough device

Xen 3.4-rc1

 

Dom0: 2.6.18.8-xen0 (pciback.hide=”03:00.0”)

DomU: Linux pv 2.6.26-1 (Debian) ( pci=[’03:00.0’] )

DomU: Windows XP SP3 HVM ( pci=[’03:00.0’] )

 

Starting Linux PV with passthrough graphics OK, then start Windows HVM with passthrough also (happened by accident) and xentools proceeds to start without warning or error. The passthrough to Windows HVM is not working anyway.

 

Switching off the Windows HVM then caused a complete lock up on Dom0, had to hit the reset switch!

 

 

 

--- Begin Message ---

• To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
• From: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx>
• Date: Wed, 25 Feb 2009 19:27:41 +0800
• Thread-index: AcmXPBIY3DpbmkMhSWGCchryUGOYHQ==
• Thread-topic: xc.test_assign_device() doesn't work for devices assigned via the traditional PCI passthrough(without VT-d).

e.g., with xen parameter 'iommu=on,no-pv', after we assign a device to pv 
guest1, we can still assign the device to hvm guest2 because when xend creates 
guest2, it's wrongly told by xc.test_assign() the device is not assigned.

To judge if a device has been assigned, xc.test_assign() is not enough; maybe 
we also have to scan xenstore?

Thanks,
-- Dexuan

--- End Message ---

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