[Bug 2038834] Re: GPU acceleration via VirGL is broken in qemu

[Mate Kukri]

** Description changed:

- This was reported by someone else upstream and is already fixed by
- https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25580.
+ 
+ [ Impact ] 
+  * Enabling GPU acceleration can cause host-side crashes on mantic/noble VMs 
+ 
+  * This was reported by someone else upstream and is already fixed by 
+    https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25580.
+ 
+ [ Test Plan ]
+ 
+  * I've tested the patch on an affected macOS host running Ubuntu in UTM with 
+    OpenGL enabled on both Mantic and Noble VMs.
+ 
+  * Anyone else can do the same on an affected host by simply installing the 
+    patched package and booting to the desktop.
+ 
+ [ Where problems could occur ]
+ 
+  * This patch fixes an upstream mesa regression which caused libvirglrendrer to 
+    crash on the host side.
+ 
+  * This makes a non-working use case work, VirGL on affected hosts cannot 
+    regress as it simply didn't work before.
+ 
+  * Risk of breakage is mainly from other packages possible affected by a mesa 
+    rebuild.

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https://bugs.launchpad.net/bugs/2038834

Title:
  GPU acceleration via VirGL is broken in qemu

Status in Release Notes for Ubuntu:
  New
Status in mesa package in Ubuntu:
  Confirmed
Status in mesa source package in Mantic:
  New
Status in mesa source package in Noble:
  Confirmed

Bug description:
  
  [ Impact ] 
   * Enabling GPU acceleration can cause host-side crashes on mantic/noble VMs 

   * This was reported by someone else upstream and is already fixed by 
     https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25580.

  [ Test Plan ]

   * I've tested the patch on an affected macOS host running Ubuntu in UTM with 
     OpenGL enabled on both Mantic and Noble VMs.

   * Anyone else can do the same on an affected host by simply installing the 
     patched package and booting to the desktop.

  [ Where problems could occur ]

   * This patch fixes an upstream mesa regression which caused libvirglrendrer to 
     crash on the host side.

   * This makes a non-working use case work, VirGL on affected hosts cannot 
     regress as it simply didn't work before.

   * Risk of breakage is mainly from other packages possible affected by a mesa 
     rebuild.

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