Bug 850927 - QMP: two events related issues on S3 wakeup
QMP: two events related issues on S3 wakeup
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Luiz Capitulino
Virtualization Bugs
Depends On:
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Reported: 2012-08-22 14:58 EDT by Luiz Capitulino
Modified: 2013-02-21 02:38 EST (History)
11 users (show)

See Also:
Fixed In Version: qemu-kvm-
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2013-02-21 02:38:45 EST
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Luiz Capitulino 2012-08-22 14:58:16 EDT
Description of problem:

There are two issues related to QMP events on S3 wakeup:

 1. A spurious RESET event is emitted
 2. The semantics of when the WAKEUP event is emitted is not very clear

The severity of these problems are very small, but as they have been fixed upstream it's a good idea to backport the fixes.

Version-Release number of selected component (if applicable):

How reproducible:

Only the spurious RESET can be reproduced.

Steps to Reproduce:
1. Start qemu-kvm with a QMP socket

qemu-kvm [...] -qmp tcp:0:4444

2. Connect, and do capabilities negotiation

{ "execute": "qmp_capabilities" }

3. In the guest, do:

# echo mem > /sys/power/state

4. Resume by pressing a keyboard key or running the system_wakeup command

5. Observe the events that have been emitted
Actual results:

A RESET event is emitted.

Expected results:

No RESET event is emitted.
Comment 1 Luiz Capitulino 2012-08-27 13:11:04 EDT
Patches posted downstream (last week).
Comment 4 langfang 2012-10-09 01:40:22 EDT
verify this bug as follow version:
# uname -r
# rpm -q qemu-kvm
# rpm -q seabios

1./usr/libexec/qemu-kvm -m 2G -smp 2 -cpu Penryn -rtc base=localtime,clock=host,driftfix=slew -drive file=/home/RHEL-Server-6.3-64-virtio.qcow2,format=qcow2,if=none,id=drive-ide0-0-0,werror=stop,rerror=stop,cache=none -device ide-drive,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,id=hostnet0,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,mac=04:21:19:29:28:33,bus=pci.0,addr=0x4,id=net0 -boot c -uuid a0afffcd-f989-45f3-8422-32252bfe4b31 -rtc-td-hack -monitor stdio -name rhel6.4 -vnc :5  -usbdevice tablet -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -qmp tcp:0:4444,server,nowait
2.in guest
#echo mem >/sys/power/state


Connected to
Escape character is '^]'.
{"QMP": {"version": {"qemu": {"micro": 1, "minor": 12, "major": 0}, "package": "(qemu-kvm-"}, "capabilities": []}}
{"return": {}}
{"timestamp": {"seconds": 1349757847, "microseconds": 488577}, "event": "SUSPEND"} --->for S3
{"timestamp": {"seconds": 1349757851, "microseconds": 3171}, "event": "WAKEUP"}
---->not emit RESET event.
Comment 6 errata-xmlrpc 2013-02-21 02:38:45 EST
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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