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[Qemu-devel] [PULL 2/3] usb: add storage hotplug documentation
From: |
Gerd Hoffmann |
Subject: |
[Qemu-devel] [PULL 2/3] usb: add storage hotplug documentation |
Date: |
Tue, 12 Jul 2016 10:48:09 +0200 |
Suggested-by: Paolo Bonzini <address@hidden>
Signed-off-by: Gerd Hoffmann <address@hidden>
Message-id: address@hidden
---
docs/usb-storage.txt | 12 ++++++++++++
1 file changed, 12 insertions(+)
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
--
1.8.3.1