/etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction video=efifb:off video=vesafb:off"

/etc/pve/qemu-sever/101.conf

args: -no-hpet -rtc driftfix=slew -global kvm-pit.lost_tick_policy=discard -cpu host,hv_time,kvm=off,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_v...

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virsh net-autostart networkname leads to the above mentioned Error Message. The solution is stupid but it works...

virsh net-edit networkname go to the end and add some empty lines, save the file and quit.

virsh net-autostart networkname works like charm....

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Easy as this

virsh setmem  4096M --live --config

 

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