Re: [Linaro-mm-sig] [PATCH 1/2] dma-buf: Require VM_PFNMAP vma for mmap

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Am 24.02.21 um 19:46 schrieb Jason Gunthorpe:
On Wed, Feb 24, 2021 at 09:45:51AM +0100, Daniel Vetter wrote:

Hm I figured everyone just uses MAP_SHARED for buffer objects since
COW really makes absolutely no sense. How would we enforce this?
In RDMA we test

drivers/infiniband/core/ib_core_uverbs.c:       if (!(vma->vm_flags & VM_SHARED))

During mmap to reject use of MAP_PRIVATE on BAR pages.

That's a really good idea. MAP_PRIVATE and any driver mappings doesn't really work at all.

Christian.


Jason





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