Fine-grained control of nested virtualization for VM guests.

Proxmox VE 9.1
Released 19. November 2025

Highlights

• Create LXC containers from OCI images.
  Open Container Initiative (OCI) images are a popular format for distributing templates for system or application containers.
  OCI images can now be uploaded manually or downloaded from image registries, and then be used as templates for LXC containers.
  This allows to create full system containers from suitable OCI images.
  Initial support for creating application containers from suitable OCI images is also available (technology preview).
• Support for TPM state in qcow2 format.
  Some VM guest workloads require attaching a virtual Trusted Platform Module (TPM), for example newer Windows guests.
  The state of a virtual TPM can now be stored in the qcow2 format.
  This allows taking snapshots of VMs with a TPM state on file-level storages such as NFS or CIFS shares.
  Storages with "snapshots as volume chains" (technology preview) enabled now support taking offline snapshots of VMs with TPM state.
• Fine-grained control of nested virtualization for VM guests.
  Some VM guest workloads need access to the host CPU's virtualization extensions for nested virtualization.
  Examples are nested hypervisors or Windows guests with Virtualization-based Security enabled.
  A new vCPU flag allows to enable nested virtualization on top of a vCPU type that corresponds to the host CPU vendor and generation.
  This can be an alternative to using the full host vCPU type.
• More detailed status reporting for the Software-Defined Networking (SDN) stack in the GUI.
  Local bridges and VNets report the currently connected guests.
  EVPN zones additionally report the learned IPs and MAC addresses.
  Fabrics are now part of the resource tree and report routes, neighbors, and interfaces.
• Kernel 6.17 as new stable default.
• Seamless upgrade from Proxmox VE 8.4, see Upgrade from 8 to 9.