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

[Peter Lieven]

Am 16.01.20 um 21:26 schrieb Dr. David Alan Gilbert:
> * Peter Lieven (address@hidden) 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 (address@hidden) wrote:
>>>>>> Am 08.01.20 um 16:04 schrieb Dr. David Alan Gilbert:
>>>>>>> * Peter Lieven (address@hidden) 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.


Thanks

Peter