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 17.01.20 um 16:59 schrieb Dr. David Alan Gilbert:
> > * Peter Lieven (pl@kamp.de) wrote:
> > > Am 16.01.20 um 21:26 schrieb Dr. David Alan Gilbert:
> > > > * 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.
> > > Your patch also seems to fix also my issue. No more errors and the network keeps responding.
> > Great, can you reply to that post with a Tested-by ?
> 
> 
> I was not sure if I should reply since the patch is for a total different issue.
> 
> Anyway, please feel free to add a
> 
> 
> Tested-by: Peter Lieven <pl@kamp.de>
> 
> 
> I am currently not subscribed to qemu-devel so I can't reply directly.
> 

OK, thanks!

Dave

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