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linux/drivers/vfio/pci
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Ankit Agrawal 44e35bfd2e vfio/nvgrace-gpu: Expose the blackwell device PF BAR1 to the VM 
[ Upstream commit 6a9eb2d125 ]

There is a HW defect on Grace Hopper (GH) to support the
Multi-Instance GPU (MIG) feature [1] that necessiated the presence
of a 1G region carved out from the device memory and mapped as
uncached. The 1G region is shown as a fake BAR (comprising region 2 and 3)
to workaround the issue.

The Grace Blackwell systems (GB) differ from GH systems in the following
aspects:
1. The aforementioned HW defect is fixed on GB systems.
2. There is a usable BAR1 (region 2 and 3) on GB systems for the
GPUdirect RDMA feature [2].

This patch accommodate those GB changes by showing the 64b physical
device BAR1 (region2 and 3) to the VM instead of the fake one. This
takes care of both the differences.

Moreover, the entire device memory is exposed on GB as cacheable to
the VM as there is no carveout required.

Link: https://www.nvidia.com/en-in/technologies/multi-instance-gpu/ [1]
Link: https://docs.nvidia.com/cuda/gpudirect-rdma/ [2]

Cc: Kevin Tian <kevin.tian@intel.com>
CC: Jason Gunthorpe <jgg@nvidia.com>
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Link: https://lore.kernel.org/r/20250124183102.3976-3-ankita@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-02-21 14:01:26 +01:00
..
hisilicon [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
mlx5 vfio/mlx5: Align the page tracking max message size with the device capability 2024-12-14 20:04:14 +01:00
nvgrace-gpu vfio/nvgrace-gpu: Expose the blackwell device PF BAR1 to the VM 2025-02-21 14:01:26 +01:00
pds [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
qat vfio/qat: fix overflow check in qat_vf_resume_write() 2024-12-09 10:41:04 +01:00
virtio vfio/pci: rename and export range_intersect_range 2024-02-22 12:20:20 -07:00
Kconfig vfio/qat: Add vfio_pci driver for Intel QAT SR-IOV VF devices 2024-04-29 13:25:41 -06:00
Makefile vfio/qat: Add vfio_pci driver for Intel QAT SR-IOV VF devices 2024-04-29 13:25:41 -06:00
trace.h vfio/pci: Cleanup license mess 2019-01-22 11:06:05 -07:00
vfio_pci.c VFIO: Add the SPR_DSA and SPR_IAX devices to the denylist 2024-05-13 14:07:33 +00:00
vfio_pci_config.c vfio/pci: Properly hide first-in-list PCIe extended capability 2024-12-05 14:02:29 +01:00
vfio_pci_core.c vfio/pci: Fallback huge faults for unaligned pfn 2025-01-17 13:40:45 +01:00
vfio_pci_igd.c vfio: Use GFP_KERNEL_ACCOUNT for userspace persistent allocations 2023-01-23 11:26:29 -07:00
vfio_pci_intrs.c vfio/pci: fix potential memory leak in vfio_intx_enable() 2024-04-22 16:52:08 -06:00
vfio_pci_priv.h vfio/pci: Mask INTx during runtime suspend 2022-09-01 15:29:11 -06:00
vfio_pci_rdwr.c vfio/pci: Enable iowrite64 and ioread64 for vfio pci 2025-02-21 14:01:26 +01:00
vfio_pci_zdev.c Merge remote-tracking branch 'mlx5/mlx5-vfio' into v6.1/vfio/next 2022-09-08 10:44:34 -06:00