Linux i915 GVT-g mediated GPU virtualisation (debugfs teardown): MULTI-TENANT ISOLATION: Companion to the vGPU debugfs

Impact

MULTI-TENANT ISOLATION: Companion to the vGPU debugfs cleanup bug: GVT-g destroys debugfs state without checking the DRM minor's debugfs root is still valid, crashing the host on teardown. Again on the vGPU lifecycle path, which is the tenant boundary on GVT-g deployments.

Who can reach it

Whoever can drive vGPU create/destroy on the host.

What to do

Fix ships in the Linux kernel. Update the kernel and reboot the node - in practice this is a drain plus reboot because the accelerator driver cannot be unloaded while jobs hold device file descriptors. No BIOS or firmware update needed.

References