Re: [edk2-devel] [BUG] Extremely slow boot times with CPU and GPU passthrough and host phys-bits > 40

["mitchell.augustin via groups.io" <mitchell.augustin=canonical.com@groups.io>]

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

The root cause of the slowness is now fixed ( https://lore.kernel.org/all/20250218222209.1382449-1-alex.williamson@redhat.com/ ) in the mainline kernel, so this issue should not impact Ubuntu 25.04 Plucky Puffin or future Ubuntu releases once that fix ( https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2111861 ) 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 ( https://github.com/tianocore/edk2/pull/10856 ) in its ovmf, so Noble users experiencing this issue can now apply the fw_cfg workaround described here ( https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2101903 ) to their VMs to achieve much faster boot times with large GPU passthrough.

Thanks,
Mitchell Augustin


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