AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/vfio
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Alexey Kardashevskiy 06e5f9bb11 vfio/pci/nvlink2: Do not attempt NPU2 setup on POWER8NVL NPU 
commit d22f9a6c92de96304c81792942ae7c306f08ac77 upstream.

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 POWER8NVL 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.

Tested on
- POWER9 pvr=004e1201, Ubuntu 19.04 host, Ubuntu 18.04 vm,
  NVIDIA GV100 10de:1db1 driver 418.39
- POWER8 pvr=004c0100, RHEL 7.6 host, Ubuntu 16.10 vm,
  NVIDIA P100 10de:15f9 driver 396.47

Fixes: 7f92891778 ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver")
Cc: stable@vger.kernel.org # 5.0
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-12-30 11:54:03 +01:00
..
fsl-mc vfio/fsl-mc: Make vfio_fsl_mc_irqs_allocate static 2020-11-03 11:07:40 -07:00
mdev vfio/mdev: Fix reference count leak in add_mdev_supported_type 2020-05-29 16:07:18 -06:00
pci vfio/pci/nvlink2: Do not attempt NPU2 setup on POWER8NVL NPU 2020-12-30 11:54:03 +01:00
platform vfio: platform: fix reference leak in vfio_platform_open 2020-11-03 11:07:40 -07:00
Kconfig vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices 2020-10-07 14:17:33 -06:00
Makefile vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices 2020-10-07 14:17:33 -06:00
vfio_iommu_spapr_tce.c vfio/spapr_tce: convert get_user_pages() --> pin_user_pages() 2020-07-27 13:43:38 -06:00
vfio_iommu_type1.c vfio/type1: Use the new helper to find vfio_group 2020-11-02 14:58:29 -07:00
vfio_spapr_eeh.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vfio.c vfio: fix a missed vfio group put in vfio_pin_pages 2020-09-22 10:56:40 -06:00
virqfd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00