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Re: qemu-4.0.1: vhost_region_add_section:Section rounded to 0 prior to p

From: Peter Lieven
Subject: Re: qemu-4.0.1: vhost_region_add_section:Section rounded to 0 prior to previous a0000
Date: Mon, 13 Jan 2020 17:25:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2

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:

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):


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

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-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
      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
      00000000000e0000-00000000000fffff (prio 1, i/o): alias isa-bios @pc.bios 
      00000000fd000000-00000000fdffffff (prio 1, ram): vga.vram
      00000000fe000000-00000000fe00ffff (prio 1, ram): vmsvga.fifo
      00000000fe010000-00000000fe013fff (prio 1, i/o): virtio-pci
        00000000fe010000-00000000fe010fff (prio 0, i/o): virtio-pci-common
        00000000fe011000-00000000fe011fff (prio 0, i/o): virtio-pci-isr
        00000000fe012000-00000000fe012fff (prio 0, i/o): virtio-pci-device
        00000000fe013000-00000000fe013fff (prio 0, i/o): virtio-pci-notify
      00000000fe014000-00000000fe017fff (prio 1, i/o): virtio-pci
        00000000fe014000-00000000fe014fff (prio 0, i/o): virtio-pci-common
        00000000fe015000-00000000fe015fff (prio 0, i/o): virtio-pci-isr
        00000000fe016000-00000000fe016fff (prio 0, i/o): virtio-pci-device
        00000000fe017000-00000000fe017fff (prio 0, i/o): virtio-pci-notify
      00000000fe018000-00000000fe01bfff (prio 1, i/o): virtio-pci
        00000000fe018000-00000000fe018fff (prio 0, i/o): virtio-pci-common
        00000000fe019000-00000000fe019fff (prio 0, i/o): virtio-pci-isr
        00000000fe01a000-00000000fe01afff (prio 0, i/o): virtio-pci-device
        00000000fe01b000-00000000fe01bfff (prio 0, i/o): virtio-pci-notify
      00000000fe01c000-00000000fe01ffff (prio 1, i/o): virtio-pci
        00000000fe01c000-00000000fe01cfff (prio 0, i/o): virtio-pci-common
        00000000fe01d000-00000000fe01dfff (prio 0, i/o): virtio-pci-isr
        00000000fe01e000-00000000fe01efff (prio 0, i/o): virtio-pci-device
        00000000fe01f000-00000000fe01ffff (prio 0, i/o): virtio-pci-notify
      00000000febd0000-00000000febd0fff (prio 1, i/o): virtio-net-pci-msix
        00000000febd0000-00000000febd002f (prio 0, i/o): msix-table
        00000000febd0800-00000000febd0807 (prio 0, i/o): msix-pba
      00000000febd1000-00000000febd1fff (prio 1, i/o): virtio-scsi-pci-msix


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