in case of OpenVZ, VPS host server admin can access OpenVZ containers without providing password doing commands: "vzlist" and then "vzctl enter CTID".

There is no such option for KVM? In case of KVM i see i can activate rescue mode for the vps in my control panel (Virtualizor) and then mount the filesystem (mkdir /vps;mount /dev/sdb1 /vps;cd /vps;ls -l) (sdb1 discovered thru "fdisk -l" command) and then probably edit the data or transfer data to the dedicated server: scp -r /vps/folder/ [email protected]:/distinationDir/ -p sshporthere

But any way to browse KVM VPS file system without reboot while not having SSH access to the KVM?