Difference between revisions of "Merged Drivers"
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=== Known Issues === | === Known Issues === | ||
# SR-IOV functionality is undocumented in the [https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html i915 driver API documentation]. <br /> ''Confirmed affected versions: '''* | # SR-IOV functionality is undocumented in the [https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html i915 driver API documentation]. <br /> '''''Confirmed affected versions:''' *'' | ||
#GVT-g functions require use of KVMGT/XenGT (forked from mainline) <br />''Confirmed affected versions: '''* | #GVT-g functions require use of KVMGT/XenGT (forked from mainline) <br />'''''Confirmed affected versions:''' *''[[File:Intel i915 Host DRM + VFIO-Mdev..png|thumb|A diagram depicting i915's shared host + VFIO-Mdev driver model.]] | ||
== Nvidia == | == Nvidia == | ||
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=== Known Issues === | === Known Issues === | ||
# Power management on laptops running mediated graphics functionality may causes graphical errors when not plugged in to AC power. <br />''Confirmed affected versions: '''460.32.01, 460.73.04 | # Power management on laptops running mediated graphics functionality may causes graphical errors when not plugged in to AC power. <br />'''''Confirmed affected versions:''' 460.32.01, 460.73.04'' <br />'''''Possible mitigation:''''' ([https://lore.kernel.org/lkml/[email protected]/ lore.kernel.org vfio/pci power management patch]): ''"vfio/pci: Change the PF power state to D0 before enabling VFs"'' | ||
# VFIO-vmalloc errors may occur as a result of page collisions between host & guest on GPUs with smaller VRAM frame buffer sizes. <br />''Confirmed affected versions: '''460.32.01, 460.73.04 | # VFIO-vmalloc errors may occur as a result of page collisions between host & guest on GPUs with smaller VRAM frame buffer sizes. <br />'''''Confirmed affected versions:''' 460.32.01, 460.73.04'' | ||
== AMDGPU == | == AMDGPU == | ||
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=== Known Issues === | === Known Issues === | ||
# Host DRM does not work alongside guest VFIO-Mdev. <br />''Confirmed affected versions: '''* | # Host DRM does not work alongside guest VFIO-Mdev. <br />'''''Confirmed affected versions:''' *'' | ||
# | #The amdgpu kernel module doesn't contain hooks for guest signalling via [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3 irqfd] & [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d34e6b175e61821026893ec5298cc8e7558df43a ioeventfd] used for VFIO-mdev callbacks. <br />'''''Confirmed affected versions:''' *'' <br /> | ||
Revision as of 22:29, 26 April 2022
The following page will provide specifications and details on the current state of host DRM + VFIO-Mdev drivers in support of various vendors.
Intel i915
Intel's slides mention the ability to accelerate up to '8 VMs plus DOM0'. Source: https://01.org/sites/default/files/documentation/an_introduction_to_intel_gvt-g_for_external.pdf
Intel currently supports host DRM and VFIO-Mdev functionality in it's i915 driver sources.
Known Issues
- SR-IOV functionality is undocumented in the i915 driver API documentation.
Confirmed affected versions: * - GVT-g functions require use of KVMGT/XenGT (forked from mainline)
Confirmed affected versions: *
Nvidia
For more information on host DRM and VFIO-Mdev support on Nvidia drivers refer to section 6 of the vGPU Community Wiki.
Known Issues
- Power management on laptops running mediated graphics functionality may causes graphical errors when not plugged in to AC power.
Confirmed affected versions: 460.32.01, 460.73.04
Possible mitigation: (lore.kernel.org vfio/pci power management patch): "vfio/pci: Change the PF power state to D0 before enabling VFs" - VFIO-vmalloc errors may occur as a result of page collisions between host & guest on GPUs with smaller VRAM frame buffer sizes.
Confirmed affected versions: 460.32.01, 460.73.04
AMDGPU
At this time AMDGPU does not currently support VFIO-Mdev functionality. It may be possible to incorporate RPC Mode mediated device support similar to those functions in nvidia.ko and i915.ko in the Linux kernel's AMDGPU driver sources to produce a driver suitable for merged host+guest DRM for use with AMD GPU devices.