HVM - 2nd bridge breaking DomU config

[Oliver Linden <oliver_linden@xxxxxxxxxxx>]

Hi all,

got the recommendation from the freenode xen IRC channel to open a ticket here. Hoping that's ok.

Problem:

I want to provide a second bridge to a HVM Linux DomU. But as soon as I add this to the DomU config file the DomU doesn't start and the qemu log file does state

qemu-system-i386: -device rtl8139,id=nic1,netdev=net1,mac=00:16:3e:35:af:af: xen: failed to populate ram at 1100c0000 (same with e1000)

Providing only one bridge does work fine. Since I couldn't find anything meaningful to me on the Internet I'm asking here. Any help is highly appreciated.

root@HAM-XEN1:/etc/xen# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.1 LTS
Release:        20.04
Codename:       focal

root@HAM-XEN1:/etc/xen# uname -a
Linux HAM-XEN1 5.4.0-54-generic #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

root@HAM-XEN1:/etc/xen# xl info
host                   : HAM-XEN1
release                : 5.4.0-54-generic
version                : #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020
machine                : x86_64
nr_cpus                : 16
max_cpu_id             : 31
nr_nodes               : 1
cores_per_socket       : 8
threads_per_core       : 2
cpu_mhz                : 3593.326
hw_caps                : 178bf3ff:f6d8320b:2e500800:244037ff:0000000f:219c91a9:00400004:00000500
virt_caps              : hvm hvm_directio
total_memory           : 32699
free_memory            : 7150
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 11
xen_extra              : .4-pre
xen_version            : 4.11.4-pre
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : placeholder dom0_max_vcpus=2-3 dom0_mem=1024M,max:2048M iommu=amd-iommu-global-intremap loglvl=all guest_loglvl=all quiet no-real-mode edd=off
cc_compiler            : gcc (Ubuntu 9.2.1-31ubuntu3) 9.2.1 20200306
cc_compile_by          : ubuntu-devel-di
cc_compile_domain      : lists.ubuntu.com
cc_compile_date        : Tue Mar 10 09:04:06 UTC 2020
build_id               : 70edf50fce444a706eb5c69735c35c1838e4eaee
xend_config_format     : 4

Best, Oliver

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