Re: [Xen-devel] [PATCH v8] interrupts: allow guest to set/clear MSI-X mask bit

["Xu, YongweiX" <yongweix.xu@xxxxxxxxx>]

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Monday, September 16, 2013 5:37 PM
> To: Joby Poriyath; Xu, YongweiX
> Cc: Sander Eikelenboom; xen-devel
> Subject: RE: [Xen-devel] [PATCH v8] interrupts: allow guest to set/clear MSI-X
> mask bit
> 
> >>> On 16.09.13 at 10:33, "Xu, YongweiX" <yongweix.xu@xxxxxxxxx> wrote:
> > I found your patch (Xen C/S:27480 7843bc3502ae) introduced a new
> > issue, when I boot up a rhel6.4 guest with assigned a e1000e/igb/ixgbe
> > PF or VF and more than 1 vcpu, the guest's network will be broken in a
> > short time and cannot be recovered.
> > The test machine was SandyBridge-EP and IvyTown-EP.
> 
> I would be very helpful if you could give some more detail: What specifically
> doesn't work, logs, ...
> 
> That's particularly important since, if indeed broken, the patch would need to
> be reverted from at least the stable trees.
> 
> Jan

I've made further test about this issue, the config file as the 
attachment:rhel6u4.hvm(with qemu-xen), the result as below:
1. Boot up rhel6.4 guest with igbvf/ixgbevf/igbpf/ixgbepf/e1000e nic and 1 
vcpu, the guest network works fine.
2. Boot up rhel6.4 guest with igbvf/ixgbevf/igbpf/ixgbepf/e1000e nic and 2(or 
more) vcpus, the guest can get IP first, but after about 10~20 seconds, the 
network will be broken.
We can see only boot guest with more than 1 vcpu would cause this issue.

Only when boot guest with e1000e nic and 2(2 or more)vcpus it would print call 
trace log, but I think it's enough to explain that the network broken caused by 
MSI-X, as the attachment:guest_with_e1000e.log.

Yongwei(Terrence)

Attachment: rhel6u4.hvm
Description: rhel6u4.hvm

Attachment: guest_with_e1000e.log
Description: guest_with_e1000e.log

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