Re: [Qemu-devel] [BUG]Unassigned mem write during pci device hot-plug

[xuyandong]

n Sat, Dec 08, 2018 at 11:58:59AM +0000, xuyandong wrote:
> > Hi all,
> >
> >
> >
> > In our test, we configured VM with several pci-bridges and a
> > virtio-net nic been attached with bus 4,
> >
> > After VM is startup, We ping this nic from host to judge if it is
> > working normally. Then, we hot add pci devices to this VM with bus 0.
> >
> > We  found the virtio-net NIC in bus 4 is not working (can not connect)
> > occasionally, as it kick virtio backend failure with error below:
> >
> >     Unassigned mem write 00000000fc803004 = 0x1
> 
> Thanks for the report. Which guest was used to produce this problem?
> 
> --
> MST

I was seeing this problem when I hotplug a VFIO device to guest CentOS 7.4,
after that I compiled the latest Linux kernel and it also contains this problem.

Thinks,
Xu