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usb: add storage hotplug documentation

Message ID 1466667901-1341-1-git-send-email-kraxel@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Gerd Hoffmann June 23, 2016, 7:45 a.m. UTC 
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 docs/usb-storage.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/docs/usb-storage.txt b/docs/usb-storage.txt
index c5a3866..fbc1f2e 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