Re: qemu-4.0.1: vhost_region_add_section:Section rounded to 0 prior to previous a0000

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Peter Lieven (pl@kamp.de) wrote:
> Am 16.01.20 um 13:47 schrieb Peter Lieven:
> > Am 13.01.20 um 17:25 schrieb Peter Lieven:
> > > Am 09.01.20 um 19:44 schrieb Dr. David Alan Gilbert:
> > > > * Peter Lieven (pl@kamp.de) wrote:
> > > > > Am 08.01.20 um 16:04 schrieb Dr. David Alan Gilbert:
> > > > > > * Peter Lieven (pl@kamp.de) wrote:
> > > > > > > Hi,
> > > > > > > 
> > > > > > > 
> > > > > > > I have a Qemu 4.0.1 machine with vhost-net network adapter, thats polluting the log with the above message.
> > > > > > > 
> > > > > > > Is this something known? Googling revealed the following patch in Nemu (with seems to be a Qemu fork from Intel):
> > > > > > > 
> > > > > > > https://github.com/intel/nemu/commit/03940ded7f5370ce7492c619dccced114ef7f56e
> > > > > > > 
> > > > > > > 
> > > > > > > The network stopped functioning. After a live-migration the vServer is reachable again.
> > > > > > > 
> > > > > > > 
> > > > > > > Any ideas?
> > > > > > What guest are you running and what does your qemu commandline look
> > > > > > like?
> > > > > 
> > > > > Its running debian9. We have hundreds of other VMs with identical setup. Do not know why this one makes trouble.
> > > > Could you extract an 'info mtree' from it - particularly the
> > > > 'address-space: memory' near the top.
> > > 
> > > 
> > > Here we go:
> > > 
> > > 
> > > address-space: memory
> > >   0000000000000000-ffffffffffffffff (prio 0, i/o): system
> > >     0000000000000000-000000003fffffff (prio 0, i/o): alias ram-below-4g @pc.ram 0000000000000000-000000003fffffff
> > >     0000000000000000-ffffffffffffffff (prio -1, i/o): pci
> > >       00000000000a0000-00000000000affff (prio 2, i/o): alias vga.chain4 @vga.vram 0000000000000000-000000000000ffff
> > >       00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
> > 
> > 
> > What seems special is that the RAM area is prio2. Any idea if this makes trouble?
> 
> 
> Update from my side. This happens when I have Debian 10 with XFCE when the Graphical User Interface is initialized.
> 
> I see the log message when I specify -M pc-i440fx-2.9. If I obmit the machine type the error does not appear.

I can't persuade this to reproduce here on the images I currently have;
but if you can rebuild, can you try the v3 of 'Fix hyperv synic on
vhost' I've just posted?  It turns off the alignment code that's
spitting that error in vhost-kernel cases, so should go away.

Dave

> 
> Peter
> 
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK