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  1. RHEL
  2. RHEL-4994

Should fail to define guests by setting virtiofs space_hard/soft_limit

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    • libvirt-9.9.0-1.el9
    • sst_virtualization
    • ssg_virtualization
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      Description of problem:
      space_hard/soft_limit does not take effect

      Version-Release number of selected component (if applicable):
      libvirt-daemon-9.5.0-7.el9_3.x86_64
      qemu-kvm-8.0.0-13.el9.x86_64
      virtiofsd-1.7.2-1.el9.x86_64

      How reproducible:
      100%

      Steps to Reproduce:
      1. Setup the env for externally launched virtiofsd

      2.Define guest to add a externally-launched virtiofsd filesystem in guest:

      # virsh dumpxml lizhu --xpath //filesystem
<filesystem type="mount">
  <driver type="virtiofs" queue="1024"/>
  <source socket="/vm001-vhost-fs.sock"/>
  <target dir="mount_tag1"/>
  <alias name="fs0"/>
  <address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
  <space_hard_limit unit="bytes">8192</space_hard_limit>
</filesystem>

      3. Start the guest

      # virsh start lizhu
Domain 'lizhu' started

      4. Check the qemu cmd line

      # ps aux |grep lizhu
...
-chardev socket,id=chr-vu-fs0,path=/vm001-vhost-fs.sock -device
{"driver":"vhost-user-fs-pci","id":"fs0","chardev":"chr-vu-fs0","queue-size":1024,"tag":"mount_tag1","bus":"pci.8","addr":"0x0"}
...

      (no limit flag in the above qemu cmd line)

      5. Login into the guest

      [Guest OS]#mount -t virtiofs mount_tag1 /mnt
[Guest OS]# df -h
# df -h
Filesystem             Size  Used Avail Use% Mounted on
devtmpfs               4.0M     0  4.0M   0% /dev
tmpfs                  873M     0  873M   0% /dev/shm
tmpfs                  349M  9.4M  340M   3% /run
/dev/mapper/rhel-root  7.4G  1.3G  6.2G  17% /
/dev/vda2              960M  215M  746M  23% /boot
/dev/vda1              599M  7.0M  592M   2% /boot/efi
mount_tag1              70G  5.4G   65G   8% /mnt
tmpfs                  175M     0  175M   0% /run/user/0

      6. Write a file more than 8kB

      [Guest OS]# cat /root/messages > /mnt/file3
[Guest OS]# ll /mnt/file3 -h
-rw-r--r--. 1 root root 642K Sep 16 21:24 /mnt/file3

      Actual results:
      Can write a file with size more than hard_limit to mounted virtiofs disk

      Expected results:
      When we define or edit_save guest XML with space_hard/soft_limit, report error if these two parameters are not supported, or update the document in libvirt.org

            jtomko@redhat.com Jano Tomko
            rhn-support-lizhu Lili Zhu
            virt-maint virt-maint
            Lili Zhu Lili Zhu
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              Created:
              Updated:
              Resolved: