aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorGerd Hoffmann <kraxel@redhat.com>2016-06-23 09:45:01 +0200
committerGerd Hoffmann <kraxel@redhat.com>2016-07-12 10:25:30 +0200
commitb91e013982e8bd44833974128f1581e427082880 (patch)
tree80b6707353ebd3f58ca46da2172cf7432ea44e1a
parenta4055d85863be76a5fb70ecd001e7db5bc6bd5cb (diff)
usb: add storage hotplug documentation
Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Message-id: 1466667901-1341-1-git-send-email-kraxel@redhat.com
-rw-r--r--docs/usb-storage.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/usb-storage.txt b/docs/usb-storage.txt
index c5a3866eeb..fbc1f2edd8 100644
--- a/docs/usb-storage.txt
+++ b/docs/usb-storage.txt
@@ -40,6 +40,18 @@ numbers must be continuous, i.e. for three devices you must use 0+1+2.
The 0+1+5 numbering from the "usb-uas" example isn't going to work
with "usb-bot".
+Starting with qemu version 2.7 usb-bot and usb-uas devices can be
+hotplugged. In the hotplug case they are added with "attached =
+false" so the guest will not see the device until the "attached"
+property is explicitly set to true. That allows to attach one or more
+scsi devices before making the device visible to the guest, i.e. the
+workflow looks like this:
+
+ (1) device-add usb-bot,id=foo
+ (2) device-add scsi-{hd,cd},bus=foo.0,lun=0
+ (2b) optionally add more devices (luns 1 ... 15).
+ (3) scripts/qmp/qom-set foo.attached = true
+
enjoy,
Gerd