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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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.