Re: [PATCH 0/3] util/userfaultfd: Support /dev/userfaultfd

[Michal Prívozník]

On 1/31/23 22:01, Peter Xu wrote:
> I'll wait 1-2 more days to see whether Michal has anything to comment.

Yeah, we can go with your patches and leave FD passing for future work.
It's orthogonal after all.

In the end we can have (in the order of precedence):

1) new cmd line argument, say:

   qemu-system-x86_64 -userfaultfd fd=5 # where FD 5 is passed by
libvirt when exec()-ing qemu, just like other FDs, e.g. -chardev
socket,fd=XXX

2) your patches, where qemu opens /dev/userfaultfd

3) current behavior, userfaultfd syscall


Michal