Info for Ubuntu users who may read this thread in the future:

 

The root cause of the slowness is now fixed in the mainline kernel, so this issue should not impact Ubuntu 25.04 Plucky Puffin or future Ubuntu releases once that fix is released to our Ubuntu kernels. (expected to release in the Ubuntu stable kernels in mid-July 2025)

 

Ubuntu 24.04 Noble Numbat (LTS) now contains this patch in its ovmf, so Noble users experiencing this issue can now apply the fw_cfg workaround described here to their VMs to achieve much faster boot times with large GPU passthrough.

 

Thanks,

Mitchell Augustin

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