On 13/11/2020 16:30, Andrew Donnellan wrote:
On 13/11/20 4:06 pm, Alexey Kardashevskiy wrote:
We execute certain NPU2 setup code (such as mapping an LPID to a device
in NPU2) unconditionally if an Nvlink bridge is detected. However this
cannot succeed on P8+ machines as the init helpers return an error other
than ENODEV which means the device is there is and setup failed so
vfio_pci_enable() fails and pass through is not possible.
This changes the two NPU2 related init helpers to return -ENODEV if
there is no "memory-region" device tree property as this is
the distinction between NPU and NPU2.
Fixes: 7f92891778df ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2]
subdriver")
Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
Should this be Cc: stable?
This depends on whether P8+ + NVLink was ever a product (hi Leonardo)
and had actual customers who still rely on upstream kernels to work as
after many years only the last week I heard form some Redhat test
engineer that it does not work. May be cc: stable...
--
Alexey
