[PATCH docs v4 3/3] VirGL: add info about feature sets with OpenGL4.6 and vulkan

[Markus Frank <m.frank@proxmox.com>]

Signed-off-by: Markus Frank <m.frank@proxmox.com>
---
new to v4

 qm.adoc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/qm.adoc b/qm.adoc
index 18a4fbe..12c1752 100644
--- a/qm.adoc
+++ b/qm.adoc
@@ -1047,6 +1047,9 @@ default due to being relatively big and also not available as open source for
 all GPU models/vendors. For most setups you'll just need to do:
 `apt install libgl1 libegl1`
 
+To use Vulkan (Venus) you also need to install the virgl-server:
+`apt install virgl-server`
+
 You can edit the amount of memory given to the virtual GPU, by setting
 the 'memory' option. This can enable higher resolutions inside the VM,
 especially with SPICE/QXL.
@@ -1066,6 +1069,20 @@ Selecting `serialX` as display 'type' disables the VGA output, and redirects
 the Web Console to the selected serial port. A configured display 'memory'
 setting will be ignored in that case.
 
+.VirGL Feature Sets
+
+|===
+|Feature Set |Description
+|`opengl4.3 (Default)` |The default VirGL implementation; does not require a host memory window for blob resources
+|`opengl4.6` |Adds support for OpenGL 4.6 by adding a host memory window (Default = 2048MiB) for blob resources
+|`opengl4.6+vulkan` |Adds for OpenGL 4.6 and Vulkan by adding a host memory window for blob resources and enabling venus
+|===
+
+The VirGL host memory window and blob resources allow a guest VM to
+directly map and write to host GPU VRAM or system memory without copying
+overhead, enabling the zero-copy buffer sharing and persistent memory
+mapping required for Vulkan and OpenGL 4.6.
+
 .VNC clipboard
 You can enable the VNC clipboard by setting `clipboard` to `vnc`.
 
-- 
2.47.3