This is the best summary I could come up with:

The open-source NVIDIA “NVK” Vulkan driver within Mesa 24.1-devel has seen improvements made for systems capable of Resizable BAR “ReBAR” support.

This ReBAR work for NVK follows the Nouveau driver this week adding two new ioctls for Linux 6.8.

Besides the new GSP mode default kernel configuration knob, there are new interfaces added for the Nouveau driver to be able to return the current used vRAM allocation for video memory usage and also reading the vRAM BAR size.

With this “NOUVEAU_GETPARAM_VRAM_BAR_SIZE” to be found in Linux 6.8-rc6 releasing later today, the BAR resource size can be easily determined by user-space for those using this open-source NVIDIA kernel driver.

With those pieces now in Linux Git, Faith Ekstrand merged support for additional memory types and properties to NVK.

As part of that work is exposing a host-visible vRAM type when ReBAR is enabled.

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