Re: PCI hotplug broken?

[Marcelo Tosatti <mtosatti@redhat.com>]

On Fri, Feb 26, 2010 at 03:53:48PM +0100, Alexander Graf wrote:
> 
> On 26.02.2010, at 15:12, Alexander Graf wrote:
> 
> > Hi list,
> > 
> > While trying to upgrade some internal infrastructure to qemu-kvm-0.12 I stumbled across this really weird problem that I see with current qemu-kvm git too:
> > 
> > I start qemu-kvm using:
> > 
> > ./qemu-system-x86_64 -L ../pc-bios/ -m 512 -net nic,model=virtio -net tap,ifname=tap0,script=/bin/true -snapshot sles11.qcow2 -vnc :0 -monitor stdio
> > 
> > The system boots up just fine, networking works.
> > 
> > On the qemu monitor I then issue:
> > 
> > (qemu) pci_add auto storage file=/tmp/image.raw,if=virtio
> > 
> > after which I get a fully functional virtio block device, but the network stops sending/receiving packets.
> > 
> > The same thing with qemu-kvm-0.10 works just fine. Has anyone seen this before?
> 
> Same thing happens when hotplug only:
> 
> pci_add auto nic model=virtio,vlan=0
> 
> -> network works
> 
> pci_add auto storage file=/tmp/image.raw,if=virtio
> 
> -> network stops working
> 
> pci_add auto nic model=virtio,vlan=0
> 
> -> network works again on the new device

Can reproduce it. "info pci" shows IRQ0 assigned to virtio-blk.
Did you try, say, e1000 and SCSI ?