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9db65489b8
NVIDIA's Grace based systems have large device memory. The device memory is mapped as VM_PFNMAP in the VMM VMA. The nvgrace-gpu module could make use of the huge PFNMAP support added in mm [1]. To make use of the huge pfnmap support, fault/huge_fault ops based mapping mechanism needs to be implemented. Currently nvgrace-gpu module relies on remap_pfn_range to do the mapping during VM bootup. Replace it to instead rely on fault and use vfio_pci_vmf_insert_pfn to setup the mapping. Moreover to enable huge pfnmap, nvgrace-gpu module is updated by adding huge_fault ops implementation. The implementation establishes mapping according to the order request. Note that if the PFN or the VMA address is unaligned to the order, the mapping fallbacks to the PTE level. Link: https://lore.kernel.org/all/20240826204353.2228736-1-peterx@redhat.com/ [1] Cc: Shameer Kolothum <skolothumtho@nvidia.com> Cc: Alex Williamson <alex@shazbot.org> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Vikram Sethi <vsethi@nvidia.com> Reviewed-by: Zhi Wang <zhiw@nvidia.com> Reviewed-by: Shameer Kolothum <skolothumtho@nvidia.com> Signed-off-by: Ankit Agrawal <ankita@nvidia.com> Link: https://lore.kernel.org/r/20251127170632.3477-3-ankita@nvidia.com Signed-off-by: Alex Williamson <alex@shazbot.org> |
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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.