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Bug 1263978 - qmp don't support {"execute":"qom-get","arguments":{"path":"/machine","property":"rtc-time"}}
Summary: qmp don't support {"execute":"qom-get","arguments":{"path":"/machine","proper...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.2
Hardware: x86_64
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Markus Armbruster
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-09-17 08:55 UTC by mazhang
Modified: 2016-09-20 04:41 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-10-08 02:37:13 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description mazhang 2015-09-17 08:55:05 UTC 
Description of problem:
qmp don't support {"execute":"qom-get","arguments":{"path":"/machine","property":"rtc-time"}}

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

Host:
3.10.0-315.el7.x86_64
qemu-kvm-1.5.3-103.el7


How reproducible:
100%

Steps to Reproduce:
1.Start qemu-kvm process, execute qom-get.
# /usr/libexec/qemu-kvm -qmp tcp:0:6773,server,nowait

{"QMP": {"version": {"qemu": {"micro": 3, "minor": 5, "major": 1}, "package": " (qemu-kvm-1.5.3-103.el7)"}, "capabilities": []}}
{ "execute": "qmp_capabilities" }
{"return": {}}
{"execute":"qom-get","arguments":{"path":"/machine","property":"rtc-time"} }
{"error": {"class": "GenericError", "desc": "Property '.rtc-time' not found"}}

2.
3.

Actual results:
Not found rtc-time.

Expected results:
qemu-kvm also support rtc-time.

Additional info:
qemu-kvm-rhev-2.3.0-23.el7 works well.
{"QMP": {"version": {"qemu": {"micro": 0, "minor": 3, "major": 2}, "package": " (qemu-kvm-rhev-2.3.0-23.el7)"}, "capabilities": []}}
{ "execute": "qmp_capabilities" }
{"return": {}}
{"execute":"qom-get","arguments":{"path":"/machine","property":"rtc-time"} }
{"return": {"tm_year": 115, "tm_sec": 48, "tm_hour": 8, "tm_min": 50, "tm_mon": 8, "tm_mday": 17}}
Comment 2 Markus Armbruster 2015-09-18 17:32:53 UTC 
"/machine/rtc-time" is an alias to the property of the actual RTC
device.  Added upstream in commit 654a36d, v2.1.0.  Not in RHEL-7
qemu-kvm.

For PC machines, the RTC device is "mc146818rtc", and
"/machine/rtc-time" is an alias for
"/machine/unattached/device[X]/date", where X can vary between
versions.  In my build of RHEL-6's qemu-kvm, it's 7.

To find the "mc146818rtc" device, search for the device with type
"mc146818rtc", like this:

QMP> { "execute": "qom-get", "arguments": { "path": "/machine/unattached/device[1]", "property": "type" } }
{"return": "kvmvapic"}

Not the right one, try next

QMP> { "execute": "qom-get", "arguments": { "path": "/machine/unattached/device[2]", "property": "type" } }
{"return": "kvmclock"}

and so forth until

QMP> { "execute": "qom-get", "arguments": { "path": "/machine/unattached/device[7]", "property": "type" } }
{"return": "mc146818rtc"}

QMP> { "execute": "qom-get", "arguments": { "path": "/machine/unattached/device[7]", "property": "date" } }
{"return": {"tm_year": 115, "tm_sec": 31, "tm_hour": 17, "tm_min": 27, "tm_mon": 8, "tm_mday": 18}}

The stable alias saves you from having to know the machine's RTC
device and the name of its property (neither is going to change in
RHEL-7 qemu-kvm), and saves you the search for it.

If you think we should backport the "/machine/rtc-time" alias to
RHEL-7 qemu-kvm, please state your business case.

If not, let us know so we can close out this bug.
Comment 3 mazhang 2015-09-21 02:58:54 UTC 
This bug is according to qe's test case, I'll talk with the feature owner if close it. 
Since he is on pto, I'll update this bug when he back.

Thanks,
Mazhang.
Comment 4 mazhang 2015-10-08 02:37:13 UTC 
Just talk to scui, not need backport to qemu-kvm, so close this bug.

Thanks,
Mazhang.
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