netdev - Re: [libvirt-users] libvirt & virtio_net

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Message-ID: <20130703114327.GW2778@redhat.com>
Date:	Wed, 3 Jul 2013 12:43:28 +0100
From:	"Daniel P. Berrange" <berrange@...hat.com>
To:	poma <pomidorabelisima@...il.com>
Cc:	libvir-list@...hat.com, netdev@...r.kernel.org,
	libvirt-users@...hat.com
Subject: Re: [libvirt-users] libvirt & virtio_net - host.freeze@...et.domain

On Tue, Jul 02, 2013 at 01:25:21PM +0200, poma wrote:
> Hello people,
> 
> libvirtd (libvirt) 1.0.5.2
> virsh 1.0.5.2
> virt-manager 0.10.0
> 
> Host:
> Linux localhost 3.9.8-300.fc19.x86_64 #1 SMP Thu Jun 27 19:24:23 UTC
> 2013 x86_64 x86_64 x86_64 GNU/Linux
> Guest1:
> Linux localhost 3.9.8-300.fc19.i686.PAE #1 SMP Thu Jun 27 19:29:30 UTC
> 2013 i686 (none)
> Guest2:
> Linux localhost 3.9.8-300.fc19.x86_64 #1 SMP Thu Jun 27 19:24:23 UTC
> 2013 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> Virtual NIC - source & model:
> macvtap/NAT/bridge & virtio(virtio_net)
> 
> Host freeze at "virsh reset <domain>" or "virt-manager - Force Reset"
> Need kernel.sysrq or power reset.

I don't believe this is a libvirt issue - the 'virsh reset' command
will issue the 'system_reset' QEMU monitor command. This in turn
does an immediate reset of the guest CPUs/machine.

Even if QEMU is doing the wrong thing, the kernel should obviously
never freeze/crash in this way - it should be robust against a
malicious QEMU process.

You should probably send this message to the main QEMU and/or KVM
mailing lists so that it comes to the attention of people who are
more familiar with QEMU + virtio-net


Regards,
Daniel
-- 
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