On Tue, Feb 09, 2021 at 07:02:23PM +0000, Dr. David Alan Gilbert (git) wrote:
> From: Vivek Goyal <vgoyal@redhat.com>
> 
> As part of slave_io message, slave can ask to do I/O on an fd. Additionally
> slave can ask for dropping CAP_FSETID (if master has it) before doing I/O.
> Implement functionality to drop CAP_FSETID and gain it back after the
> operation.
> 
> This also creates a dependency on libcap-ng.

Is this patch only for the case where QEMU is running as root?

I'm not sure it will have any effect on a regular QEMU (e.g. launched by
libvirt).