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-devel

Re: [Xen-devel] Bug when disabling/enabling a PT device with MSI enabled

To: Tom Rotenberg <tom.rotenberg@xxxxxxxxx>
Subject: Re: [Xen-devel] Bug when disabling/enabling a PT device with MSI enabled
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 24 Nov 2009 14:48:15 -0500
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 24 Nov 2009 11:49:02 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <8686c3cd0911241042n1b6f84a9u3623518baa021cc2@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <8686c3cd0911241042n1b6f84a9u3623518baa021cc2@xxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.19 (2009-01-05)
On Tue, Nov 24, 2009 at 08:42:49PM +0200, Tom Rotenberg wrote:
> Hi,
> 
> I am using the xen-3,4, and i am doing pass-through for a device with
> MSI enabled (the device of-course supports MSI) to a domU with Windows
> XP. When i disable and then re-enable the device using Windows device
> manager, everything looks like it's working fine, but the device seems
> to malfunction.
> After digging a little bit, i saw that the problem is, because the bit
> of the interrupt-status (bit 3) in the status register (offset 0x6 in
> the PCI config space) was turned on somehow -  this proibably caused
> the MSI to malfunction (because the IntX assertion was enabled - thus
> disabling the MSI) - and this lead to the problem i experienced.
> 
> Any ideas on how to solve this issue?

Looks like QEMU is not doing its job. It ought to be tracking
when an MSI devices transforms to a INTx PCI device (and vice-versa) and
make the appropiate Xen calls. Look in ioemu-dir/hw/pass-through.c

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