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[Qemu-devel] [PATCH v2 0/5] usb: hotplug support for usb-bot and usb-uas

From: Gerd Hoffmann
Subject: [Qemu-devel] [PATCH v2 0/5] usb: hotplug support for usb-bot and usb-uas
Date: Wed, 15 Jun 2016 11:46:54 +0200


Composite device hotplug is a long-standing issue in qemu.

PCI multifunction hotplug has been solved recently in a pci-specific
way, by simply not showing hot-plugged functions to the guest until
function #0 is plugged.

So I figured we maybe should check whenever we can apply a simliar trick
to USB composite devices.  As the usb subsystem already can hide usb
devices from the guest (used for example with usb-host, in case the
physical usb device is not plugged in the host machine) this turned out
to be surprisingly simple.

So, here we go.  Basic idea is the "attached" state becomes settable via
monitor.  Now you can create a usb-bot (or usb-uas) device, then attach
the scsi device(s) you want, and when you are done you flip attached to
true to make the composed device visible to the guest.

v2 changes:
 * rebased to latest master.
 * add patch #1 (kill dead code for qcow2 encryption).
 * reword patch #3 as suggested by Markus.

please review,

Gerd Hoffmann (5):
  usb-storage: qcow2 encryption support is finally gone, zap dead code
  usb: make USBDevice->attached bool
  usb: Add QOM property "attached ".
  usb-bot: hotplug support
  usb-uas: hotplug support

 hw/usb/bus.c         | 50 ++++++++++++++++++++++++++++++++++++++++++++++----
 hw/usb/dev-storage.c | 42 ++++++------------------------------------
 hw/usb/dev-uas.c     |  5 +++++
 include/hw/usb.h     |  3 ++-
 4 files changed, 59 insertions(+), 41 deletions(-)


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