Re: [RFC PATCH v3 2/4] PCI/doe: Add Data Object Exchange support

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On Wed, May 19, 2021 at 4:51 PM Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
[..]
> > The short answer is that lock requirement, in the above note, rules
> > out safe direct userspace use of the DOE (unless we can tell the kernel
> > is not going to ever use it).
>
> Linux has the mitigation for that situation defined already. It's the
> mechanism for /dev/mem and pci-mmap exclusion: disable the driver to
> enable unfettered userspace access (modulo kernel-lockdown is
> disabled).
>

Note that when I say "driver" here, it need not necessarily be the
cxl_pci driver for the memory expander. For example, DOE functionality
could be handled by an aux-bus device+driver where that can be
unloaded without taking down the rest of the CXL driver.



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