Re: Backend memory object creation - query
On Thu, Jan 27, 2022 at 04:05:19 +0000, M, Shivakumar wrote:
Hello,
Hi,
note that there's no need to CC both libvir-list and libvirt-users
maling lists.
For our use-case with Libvirt we want to create the Memory backend object ,
Expected QEMU args would be
-object memory-backend-memfd,id=mem1,size=4096M
Your description is a bit vague. Do you want to use it to back the guest
memory?
As by itself a memory object itself is useless without being attached
somewhere
In case you want to configure qemu to back the default memory of the VM
by a memfd:
Per https://www.libvirt.org/formatdomain.html#memory-backing
<domain type='kvm'>
...
<memoryBacking>
<source type='memfd'/>
</memoryBacking>
...
</domain>
Results into invoking qemu with:
-machine pc-i440fx-2.9,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram \
...
-object
'{"qom-type":"memory-backend-memfd","id":"pc.ram","x-use-canonical-path-for-ramblock-id":false,"size":1048576000,"host-nodes":[0],"policy":"bind"}'
\
Request you to please help us to specify this arg in the libvirt XML.
Thanks,
Shiv