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Re: [Qemu-devel] [PATCH v4 0/6] nvdimm: support MAP_SYNC for memory-back
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From: |
Michael S. Tsirkin |
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Subject: |
Re: [Qemu-devel] [PATCH v4 0/6] nvdimm: support MAP_SYNC for memory-backend-file |
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Date: |
Thu, 1 Feb 2018 19:05:03 +0200 |
On Wed, Jan 31, 2018 at 07:02:27PM -0800, Dan Williams wrote:
> > Another question is how a user-space application (e.g., QEMU) knows
> > whether it's safe to mmap a file on the DAX file system?
>
> I think we fix vaddr_get_pfn() to start failing for DAX mappings
> unless/until we can add a "with lease" mechanism. Userspace will know
> when it is safe again when vfio stops failing.
I read some of the discussion around that but could not figure out what
exactly does happen if a file is truncated by a malicious userspace.
Could you let me know pls? Thanks!
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MST