Looking Glass KVMFR
An absence of critical technical documentation has historically slowed growth and adoption of developer ecosystems for GPU virtualization.
This CC-BY-4.0 licensed content can either be used with attribution, or used as inspiration for new documentation, created by GPU vendors for public commercial distribution as developer documentation.
Where possible, this documentation will clearly label dates and versions of observed-but-not-guaranteed behaviour vs. vendor-documented stable interfaces/behaviour with guarantees of forward or backward compatibility.
Historical page. This page documents an earlier project or architecture (the OpenMdev / LibVF.IO era, 2021–2023). It is retained for reference and is not part of the current Open-IOV stack. Current documentation starts at Documentation.
Looking Glass is an open source application that allows the use of a KVM (Kernel-based Virtual Machine) configured for VGA PCI Pass-through without an attached physical monitor, keyboard or mouse.
Looking Glass Memory Protocol (LGMP)
LGMP is an Inter-VM Shared Memory Device (IVHSMEM) based memory sharing protocol for the KVM Frame Relay use-case (sharing of MMIO memory for use by GPU drivers between host and guest).
Xen Support
It may be possible to port the Looking Glass Memory Protocol to Xen by substituting the use of the Grant Table memory sharing primitive in place of the IVSHMEM memory sharing primitive.
Telescope
The LGMP protocol may also be extended over a high bandwidth network using the Telescope Looking Glass Proxy.