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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> What does 'sudo lspci -v' print for the NPU on the host and in the guest?

Guest VM lspci -v output ( https://pastebin.ubuntu.com/p/8SV9qPBJbS/ )
Host lspci -v output ( https://pastebin.ubuntu.com/p/YV4RTZwGMv/ )

Here's one of the host GPUs:
1b:00.0 3D controller: NVIDIA Corporation GH100 [H100 SXM5 80GB] (rev a1)
DeviceName: GPU0
Subsystem: NVIDIA Corporation GH100 [H100 SXM5 80GB]
Flags: bus master, fast devsel, latency 0, IRQ 18, NUMA node 0, IOMMU group 67
Memory at 21e042000000 (64-bit, prefetchable) [size=16M]
Memory at 21a000000000 (64-bit, prefetchable) [size=128G]
Memory at 21e040000000 (64-bit, prefetchable) [size=32M]
Capabilities: <access denied>
Kernel driver in use: vfio-pci
Kernel modules: nvidiafb

And the same GPU as it appears on the guest:
06:00.0 3D controller: NVIDIA Corporation Device 2330 (rev a1)
Subsystem: NVIDIA Corporation Device 16c1
Physical Slot: 0-6
Flags: bus master, fast devsel, latency 0, IRQ 10
Memory at 382002000000 (64-bit, prefetchable) [size=16M]
Memory at 380000000000 (64-bit, prefetchable) [size=128G]
Memory at 382000000000 (64-bit, prefetchable) [size=32M]
Capabilities: <access denied>
Kernel modules: nvidiafb

Also, regarding the root cause of the slowdown, we're making some good progress in this thread ( https://lore.kernel.org/all/CAHTA-uYp07FgM6T1OZQKqAdSA5JrZo0ReNEyZgQZub4mDRrV5w@.../ ). (it is increasingly seeming like more of a kernel issue than an OVMF issue).

- Mitchell Augustin


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