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From: | Ross Lagerwall |
Subject: | [Qemu-devel] QMP event missed during startup |
Date: | Mon, 30 Oct 2017 10:50:17 +0000 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 |
Hi,I have found an issue where QEMU emits the RESUME event during startup when it starts VM execution, but it is not possible to receive this event.
To repro this, run:qemu-system-i386 -m 256 -trace enable=monitor_protocol_event_emit,file=/tmp/out -qmp unix:/tmp/qmp,server,wait
QEMU will not start execution of the VM until something connects to the QMP socket (e.g. qmp-shell). Once connected, no event is received on the QMP connection but the tracepoint is hit indicating that an event has been emitted. I suspect that the event is emitted while the QMP client is doing the initial negotiation.
The reason I want to receive this event is that QEMU currently uses xenstore to communicate this information to the Xen toolstack (see xen-common.c:xen_change_state_handler) but we want to move to using QMP rather than xenstore for this kind of thing.
Is this a known issue or just a bug that should be fixed? Thanks, -- Ross Lagerwall
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