[libvirt-users] Error Starting domain: Failed to page size of file

[Michal Privoznik]

On 3/28/19 2:25 PM, Harsh Gondaliya wrote:
> I am trying to connect a KVM-QEMU VM to OVS-DPDK vhostuser port. But, I am
> encountering a few errors. Since I am very new to libvrt and Linux I am not
> able to sort them out. Any guidance in this regard would be a great help.
> 
> These are my System Logs:

For future reference, it may be better to use some sharing service (e.g. 
pastebin) rather than pasting huge logs into an e-mail.

> *Mar 28 18:03:05 dpdk-OptiPlex-5040 libvirtd.service: 1351: error :
> qemuProcessReportLogError:1709 : internal error: early end of file from
> monitor, possible problem: 2019-03-28T12:33:05.007674Z qemu-system-x86_64:
> -chardev socket,id=charnet0,path=/var/run/openvswitch/vhost-user1: Failed
> to connect socket: Permission denied*

This says that your openvswitch is not allowing qemu to connect. You 
need to fix your permissions.

> *Mar 28 18:03:05 dpdk-OptiPlex-5040 virtlogd[6704]: Cannot open log file:
> '/var/log/libvirt/qemu/VM1.log': Device or resource busy*

This is suspicious, but if I recall correctly, this was fixed a while 
ago. You might want to test the latest libvirt. BTW what is your libvirt 
version?


> *Mar 28 18:35:58 dpdk-OptiPlex-5040 libvirtd.service: 1530: error :
> qemuProcessReportLogError:1709 : internal error: process exited while
> connecting to monitor: 2019-03-28T13:05:58.059732Z qemu-system-x86_64:
> -object
> memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=yes,size=2147483648:
> failed to get page size of file /dev/hugepages/libvirt/qemu: No such file
> or directory*

Interesting. Libvirt detected /dev/hugepages as a hugetlbfs mount but 
failed to create the directory structure there? Or perhaps it did but 
somebody/something has removed it. Or maybe, after libvirtd was started 
then /dev/hugepages was mounted over, e.g.:

# mount none /dev/hugepages -t hugetlbfs -o pagesize=1GB

which replaces /dev/hugepages mount point with a new filesystem masking 
the old one (with the directory structure) out.

Michal