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Description of problem:
Boot a guest, then hot plug a usb storage into guest, suspend guest to disk, qemu-kvm rejects to resume from s4 due to device drive is in use. In order to test s4, I disabled kvmclock.
Version-Release number of selected component (if applicable):
# uname -r
2.6.32-191.el6.x86_64
# rpm -q qemu-kvm
qemu-kvm-0.12.1.2-2.184.el6.x86_64
How reproducible:
100%
Steps to Reproduce:
1. boot a guest by:
# /usr/libexec/qemu-kvm -M rhel6.2.0 -enable-kvm -m 4096 -smp 4,sockets=1,cores=4,threads=1 -cpu cpu64-rhel6,-kvmclock -name RHEL6.1_32 -uuid e4d61315-1eb9-443c-9852-689b3f33885e -rtc base=utc,clock=host,driftfix=slew -boot dc -drive file=/tmp/mount-point/RHEL6.1-32-copy.qcow2,if=none,id=drive-ide-0-0,media=disk,format=qcow2,cache=none,werror=stop,rerror=stop -device ide-drive,drive=drive-ide-0-0,id=virt0-0-0,bootindex=1 -netdev tap,id=hostnet1 -device rtl8139,netdev=hostnet1,id=net1,mac=64:31:50:41:e1:c3 -usb -device usb-tablet,id=input1,port=1 -spice port=9000,disable-ticketing -vga qxl -global qxl-vga.vram_size=67108864 -monitor stdio -balloon none -device usb-ehci,id=ehci
2. hot add a usb storage by:
(qemu) __com.redhat_drive_add file=/home/image/usb-storage.qcow2,id=drive-usb-0-0,media=disk,format=qcow2,cache=none,werror=stop,rerror=stop
(qemu) device_add usb-storage,drive=drive-usb-0-0,id=usb-0-0,bus=ehci.0
This usb storage works fine in guest, can create and delete files.
3. suspend to disk by
# echo disk > /sys/power/state
4. resume from s4 by adding following to the cli mentioned above:
-drive file=/home/image/usb-storage.qcow2,id=drive-usb-0-0,media=disk,format=qcow2,cache=none,werror=stop,rerror=stop -device usb-storage,drive=drive-usb-0-0,id=usb-0-0,bus=ehci.0
Actual results:
After step 4, qemu-kvm refused to boot guest with:
*** EHCI support is under development ***
qemu-kvm: -device usb-storage,drive=drive-usb-0-0,id=usb-0-0,bus=ehci.0: Property 'usb-storage.drive' can't take value 'drive-usb-0-0', it's in use
Expected results:
Additional info:
Here is a update:
I found it should be 'if=none' that caused this issue. In step 4, if adding 'if=none', guest can launch from S4 successfully. But it is raising another question here:
In step 2, hot add a usb storage, please see the following output with/without 'if=none':
(qemu) __com.redhat_drive_add file=/home/image/usb-storage.qcow2,id=drive-usb-0-0,media=disk,format=qcow2,cache=none,werror=stop,rerror=stop
(qemu) __com.redhat_drive_add file=/home/image/usb-storage.qcow2,id=drive-usb-0-0,media=disk,format=qcow2,cache=none,werror=stop,rerror=stop,if=none
^^^^^^^^
Invalid parameter 'if'
And in step 4, adding 'if=none', guest booted up. without 'if=none', failed to boot up.
Q: Why there is a different rule?
Updating summary; this is not related to S4 at all. Markus, can you look into what's going on here?
Comment 5Markus Armbruster
2011-12-08 08:20:54 UTC
Step 4 adds an IDE disk, then tries to reuse its backend for an usb-storage device. Fails as expected.
The command line version of "__com.redhat_drive_add OPTS" is "-drive if=none,OPTS". The reporter mistakenly tried just "-drive OPTS", which is short for "-drive if=ide,OPTS".
Why is this so?
-drive configures both backend and frontend. if=ide gets you an IDE disk frontend, if=floppy a floppy drive frontend, if=virtio a virtio-blk frontend, and so forth. Default is if=ide.
Except for if=none, which configures *only* a backend. You configure the frontend separately, with -device. Separate configuration is desirable for cleanliness and flexibility. Unfortunately, it was shoehorned into -drive using the special if=none. That was probably a design mistake, but it's ABI now, and can't be changed.
__com.redhat_drive_add is *not* like -drive, it's like -drive if=none:
(qemu) help __com.redhat_drive_add
__com.redhat_drive_add id=name,[file=file][,format=f][,media=d]... -- Create a drive similar to -device if=none.
Note: if=none is *implied* with __com.redhat_drive_add, you can't have it in the argument.
We hope to have a cleaner and less confusing way to create block backends in time for RHEL-7.
Closing NOTABUG.