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    SubjectRe: [PATCH v11 8/9] PCI/P2PDMA: Allow userspace VMA allocations through sysfs
    Date
    On 10/21/22 10:41, Logan Gunthorpe wrote:
    > Create a sysfs bin attribute called "allocate" under the existing
    > "p2pmem" group. The only allowable operation on this file is the mmap()
    > call.
    >
    > When mmap() is called on this attribute, the kernel allocates a chunk of
    > memory from the genalloc and inserts the pages into the VMA. The
    > dev_pagemap .page_free callback will indicate when these pages are no
    > longer used and they will be put back into the genalloc.
    >
    > On device unbind, remove the sysfs file before the memremap_pages are
    > cleaned up. This ensures unmap_mapping_range() is called on the files
    > inode and no new mappings can be created.
    >
    > Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
    > Acked-by: Bjorn Helgaas <bhelgaas@google.com>
    > Reviewed-by: Christoph Hellwig <hch@lst.de>
    > Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    > ---

    Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

    -ck

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