RE: [Xen-devel] SR-IOV, Paravirt Guest fails to obtain IRQ afterfirst boot

["Robert Dunkley" <Robert@xxxxxxxxx>]

Hi Jan,

I just wanted to let you know that I applied you patch to pciback and it 
partially fixes the problem. It seems to me that the Redhat paravirt VM is not 
properly detaching itself from the VF on clean shutdown or reboot. Redhat have 
responded and here is the message I left them:

I've just finished building pciback from the 247 kernel source with the patch.
The patch applied cleanly and partially fixes the problem.

Abrupt paravirt VM restart is now OK (eg. xm destroy testvm && xm create testvm
now works)
Clean restart or clean shutdown of the VM and then xm create of VM still shows
the problem.

Additional information is appearing in Dom console when the failures occur, the
VM has 2 Intel 82576 VF assignments from 2 different Intel 82576 lan chips and
the increased info in dom0 console looks like this:
msix entry 0 for dev 05:10:0 are not freed before acquire again.
msix entry 1 for dev 05:10:0 are not freed before acquire again.
msix entry 2 for dev 05:10:0 are not freed before acquire again.
msix entry 0 for dev 09:10:0 are not freed before acquire again.
msix entry 1 for dev 09:10:0 are not freed before acquire again.
msix entry 2 for dev 09:10:0 are not freed before acquire again.
unmap irq ff failed
unmap irq fe failed
unmap irq fd failed
unmap irq fc failed
unmap irq fb failed
unmap irq fa failed

What is responsible for un-assigning the MSIX IRQ when the VM is shutdown or
rebooted? I'm using the igbvf driver that is included with the 247 kernel.



Thanks,


Rob Dunkley

-----Original Message-----
From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
Sent: 17 March 2011 20:43
To: Jan Beulich
Cc: Robert Dunkley; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] SR-IOV, Paravirt Guest fails to obtain IRQ afterfirst 
boot

On Thu, Mar 17, 2011 at 02:00:01PM +0000, Jan Beulich wrote:
> >>> On 17.03.11 at 13:56, "Robert Dunkley" <Robert@xxxxxxxxx> wrote:
> > Hi Jan,
> > 
> > Centos 5.5 with 2.6.18-247 RHEL kernel with iommu=pv and the 820 red 
> > hat settings among others. Default Centos 5.5 kernel doesn't detect 
> > any VF PCI deviavirt VM. Centos 5.5 with 247 kernel detects and 
> > works perfectly first boot but any subsequent boot gives  error as below:
> > msix entry 0 for dev 09:10:0 are
> > not freed before acquire again.
> > msix entry 1 for dev 09:10:0 are
> > not freed before acquire again.
> > msix entry 2 for dev 09:10:0 are
> > not freed before acquire again.
> > 
> > HVMs are fine with either kernel.
> > 
> > Can you give me any idea where the problem might be? Could this be a 
> > bios ACPI type issue?
> 
> Quite possibly your kernel is missing c/s 1070:2994d2997f9d 
> (http://xenbits.xen.org/hg/linux-2.6.18-xen.hg/rev/2994d2997f9d).
> 

Robert: Want to open RHEL5 bugzilla entry about this issue? 

-- Pasi


The SAQ Group

Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
Company Number: 06481952

http://www.saqnet.co.uk AS29219

SAQ Group Delivers high quality, honestly priced communication and I.T. 
services to UK Business.

Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : 
Backups : Managed Networks : Remote Support.

ISPA Member


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