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ab7032e793
The skiboot firmware has a hot reset handler which fences the NVIDIA V100 GPU RAM on Witherspoons and makes accesses no-op instead of throwing HMIs: https://github.com/open-power/skiboot/commit/fca2b2b839a67 Now we are going to pass V100 via VFIO which most certainly involves KVM guests which are often terminated without getting a chance to offline GPU RAM so we end up with a running machine with misconfigured memory. Accessing this memory produces hardware management interrupts (HMI) which bring the host down. To suppress HMIs, this wires up this hot reset hook to vfio_pci_disable() via pci_disable_device() which switches NPU2 to a safe mode and prevents HMIs. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by: Alistair Popple <alistair@popple.id.au> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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