[Bug runtime/13078] New: investigate qemu virtio-serial channel for talking to stap-sh

["fche at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13078

             Bug #: 13078
           Summary: investigate qemu virtio-serial channel for talking to
                    stap-sh
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


qemu's virtio/serial widget allows a secure bidirectional channel for
the host to talk to a guest.  We could investigate setting up some guest-side
infrastructure to have a copy of stap-sh listen on one or more such channels,
to launch stap modules without having to set up ssh.

Possible user interface:

(HOST)
% qemu-kvm -chardev socket,id=systemtap.0,server,nowait,path=/PATH/TO/SOCKET
...
% stap --remote=unix:/PATH/TO/SOCKET ...

(GUEST)
Have a systemd or sysvinit script to start up / respawn
  stap-sh </dev/virtio-ports/systemtap.0 >/dev/virtio-ports/systemtap.0 2>&1


See also:

http://www.linux-kvm.org/page/Virtio-serial_API
https://rwmj.wordpress.com/2011/07/07/how-does-libguestfs-live-work/

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