[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-discuss] Devdax backend for vnvdimm not working

From: Kamal Kakri
Subject: [Qemu-discuss] Devdax backend for vnvdimm not working
Date: Tue, 15 Jan 2019 20:13:27 +0000 (UTC)


I have a namespace (backed by real nvdimm h/w) configured in devdax mode:
# ndctl list -N -n namespace0.0

When I try to configure my vm using "virsh" with something like this:
    <memory model='nvdimm' access='shared'>
        <align unit='KiB'>2048</align>
        <size unit='KiB'>2097152</size>
      <alias name='nvdimm0'/>
      <address type='dimm' slot='0'/>

I get an error while starting my vm:
# virsh start fox22vm
start: domain(optdata): fox22vm
start: found option <domain>: fox22vm
start: <domain> trying as domain NAME
error: Failed to start domain fox22vm
error: internal error: qemu unexpectedly closed the monitor: ftruncate: Invalid 
2019-01-15T18:00:36.587467Z qemu-kvm: -object 
 unable to map backing store for guest RAM: Invalid argument

I have tried to add "align unit" to my virsh xml but it does not seem to pass 
it onto qemu (as much as I can see from the qemu cmd line in the logs at 

Can anyone pls hint as to what possibly could be the issue ? Is this alignment 
related or something else ?

Here are my versions:
# virsh --version
address@hidden libexec]# /usr/libexec/qemu-kvm --version
QEMU emulator version 2.12.0 (qemu-kvm-rhev-2.12.0-18.el7_6.1)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
# uname -a
Linux fox22hv 4.19.0-1.el7.elrepo.x86_64 #1 SMP Mon Oct 22 10:40:32 EDT 2018 
x86_64 x86_64 x86_64 GNU/Linux

reply via email to

[Prev in Thread] Current Thread [Next in Thread]