Re: [RESEND RFC PATCH 0/5] Remote mapping

On Fri, Sep 04, 2020 at 02:31:11PM +0300, Adalbert Lazăr wrote:

This patchset adds support for the remote mapping feature.
Remote mapping, as its name suggests, is a means for transparent and
zero-copy access of a remote process' address space.
access of a remote process' address space.

The feature was designed according to a specification suggested by
Paolo Bonzini:

quoted

quoted

The proposed API is a new pidfd system call, through which the parent
can map portions of its virtual address space into a file descriptor
and then pass that file descriptor to a child.

This should be:

- upstreamable, pidfd is the new cool thing and we could sell it as a
better way to do PTRACE_{PEEK,POKE}DATA

In all honesty, that sentence made me a bit uneasy as it reads like this
is implemented on top of pidfds because it makes it more likely to go
upstream not because it is the right design. To be clear, I'm not
implying any sort of malicious intent on your part but I would suggest
to phrase this a little better. :)