[libvirt] with vhostuser I cannot use hugepages

Adnan Mundres amundres at yahoo.com
Wed Jan 24 18:53:52 UTC 2018

In my setup I am using qemu-kvm without openstack. I am trying to use ovs with dpdk. In my xml file I added following lines for the dpdkvhostuser
<cpu mode='host-passthrough'>    <numa>      <cell id="0" cpus="0-6" memory="16777216" unit='KiB' memAccess="shared"/>    </numa> </cpu>  I have enabled hugepages during boot time
ot at mvmgptb11hyp01 hyp-1]# cat /proc/meminfo | grep -i hugeAnonHugePages: 126976 kBHugePages_Total: 100HugePages_Free: 80HugePages_Rsvd: 0HugePages_Surp: 0Hugepagesize: 1048576 kB
But When I start my vm (virsh start vm1.xml) I am seeing that this vm is not using memory from hugepages, rather it is taking memory from total memory. When I checked the log file I see that it is using
-object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/var/lib/libvirt/qemu/ram,share=yes
It should use backend memory as following
-object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu/vm1,share=yes
Any idea how can I use memory from hugepages
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