powerpc/ioda/npu: Call skiboot's hot reset hook when disabling NPU2

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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:
fca2b2b839

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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Alexey Kardashevskiy 2018-12-19 19:52:13 +11:00 • committed by Michael Ellerman

parent ffca395b11

commit ab7032e793

1 changed files with 10 additions and 0 deletions

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arch/powerpc/platforms/powernv/pci-ioda.c

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