On Wed, Oct 08, 2014 at 10:03:47AM +0800, Linhaifeng wrote:
Hi,
I want to use this qemu command '-object memory-backend-file,id=mem,size=2048M,mem-path=/mnt/huge,share=on' with libvirt but i can't find the 'mem-path' and 'share' in the documentation.
because the vhost-user backend based on 'share=on' parameter and libvirt support vhostuser i guess there maybe another way to support this parameter?
this is my xml:
<cpu>
<numa>
<cell id='0' cpus='0' memory='1048576' memAccess='shared'/>
<cell id='1' cpus='1' memory='1048576' memAccess='shared'/>
this memAccess='shared' is exactly what you need in order for the share='on' to be appended. I wonder why it's not there. What libvirt version are you using?
</numa>
</cpu>
<memoryBacking>
<hugepages>
<page size="2" unit="M" nodeset="0,1"/>
</hugepages>
<!--nosharepages/-->
<!--locked/-->
</memoryBacking>
<interface type='vhostuser'>
<mac address='52:54:00:3b:83:1a'/>
<source type='unix' path='/path/port1' mode='client'/>
<model type='virtio'/>
</interface>
<interface type='vhostuser'>
<mac address='52:54:00:3b:83:1b'/>
<source type='unix' path='/path/port2' mode='client'/>
<model type='virtio'/>
</interface>
when i create the VM the qemu command is like this without 'share=on' parameter:
-object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,size=1024M,id=ram-node0 -numa node,nodeid=0,cpus=0,memdev=ram-node0
-object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,size=1024M,id=ram-node1 -numa node,nodeid=1,cpus=1,memdev=ram-node1
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